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Riccardo MELLONI

Professore Ordinario
Dipartimento di Ingegneria "Enzo Ferrari"


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Pubblicazioni

2023 - Analysis of sustainable concrete obtained from the by-products of an industrial process and recycled aggregates from construction and demolition waste [Relazione in Atti di Convegno]
Bergonzoni, Marco; Melloni, Riccardo; Botti, Lucia
abstract

warming. In response to the extreme climate changes and the lack of primary resources that social-economic systems are The excessive exploitation of natural resources for construction is producing an extreme impact on air pollution and global experiencing all over the world, international and local governments are supporting the development of the culture of warming. In response to the extreme climate changes and the lack of primary resources that social-economic systems are sustainable manufacturing, following the principles of the circular economy. In this context, the present study supports the experiencing all over the world, international and local governments are supporting the development of the culture of research on the design of sustainable and cross-industry value chains. This paper investigates the characteristics of sustainable sustainable manufacturing, following the principles of the circular economy. In this context, the present study supports the concrete obtained from industrial waste and recycled aggregates from construction and demolition waste. The industrial waste research on the design of sustainable and cross-industry value chains. This paper investigates the characteristics of sustainable adopted in this study is the by-product of an industrial production process. The aim was to investigate the characteristics of concrete obtained from industrial waste and recycled aggregates from construction and demolition waste. The industrial waste such a by-product as a recycled additive for sustainable concrete and to assess its eco-compatible safety performance. The adopted in this study is the by-product of an industrial production process. The aim was to investigate the characteristics of results suggest that the by-products adopted in this research provide an interesting alternative to the use of primary resources, such a by-product as a recycled additive for sustainable concrete and to assess its eco-compatible safety performance. The e.g. the fine sand, in the concrete mixture. However, the optimal amount of by-products depends on the characteristics of the results suggest that the by-products adopted in this research provide an interesting alternative to the use of primary resources, waste material in the mixture. The eco-compatibility test was performed to investigate the leaching behavior of the proposed e.g. the fine sand, in the concrete mixture. However, the optimal amount of by-products depends on the characteristics of the sustainable concrete. The present research promotes the adoption of a cross-industry and circular approach towards waste material in the mixture. The eco-compatibility test was performed to investigate the leaching behavior of the proposed sustainability, showing that the use of industrial waste to produce sustainable concrete allows benefits for all the stakeholders sustainable concrete. The present research promotes the adoption of a cross-industry and circular approach towards involved in the value chain and for society. sustainability, showing that the use of industrial waste to produce sustainable concrete allows benefits for all the stakeholders involved in the value chain and for society.


2022 - A structured approach to support the definition of confined space entry and working procedures in the wine industry [Relazione in Atti di Convegno]
Mosconi, Simone; Bacchetta, Adriano; Melloni, Riccardo; Oliva, Maniva; Botti, Lucia
abstract


2022 - Accidents at work: an insight into logistics operations [Relazione in Atti di Convegno]
Botti, L.; Oliva, M.; Melloni, R.
abstract

The logistics industry ensures the delivery and storage of goods and materials around the world, covering both the distribution and the warehousing sectors of every industry. The injury rate of the logistics industry is notable and above the average compared to other industries. The high accident rate of the logistics industry is partly due to the significant weight and size of some of the items handled and the vehicles and equipment required to handle them. Also, logistics entails workers moving between different work areas or sites during the day, each of which have many different safety measures, procedures, and approaches to risk management. This paper introduces a structured analysis of occupational accidents that occurred during logistics operations. The investigation includes more than 900 fatal and serious accidents that occurred in Italy between 2002 and 2016, involving workers from the logistics industry. The findings show that the contact of the injured worker with moving objects or vehicles, the variation of movement of the vehicle or transport system, and the falling of objects from above were the most common types of accidents that occurred in logistics. Industrial trucks were the most frequent risk factors that triggered the investigated events. Material handling was the activity that the injured workers were usually performing when the accidents occurred. The leading apparent causes of accidents were the voluntary adoption of an improper procedure, e.g. the bypass of a risk control measure, and the misplacement of the worker. The lack of training appears to be the leading root cause of the investigated events.


2022 - Learn from the past and act for the future: A holistic and participative approach for improving occupational health and safety in industry [Articolo su rivista]
Botti, L.; Melloni, R.; Oliva, M.
abstract

The European working population is significantly ageing. This trend is expected to increase in the next years. In this context, occupational health and safety strategies need to evolve, developing return-to-work procedures and workplace modifications to avoid long-term sickness absence and early retirement. Safety management strategies should consider age related factors, so that every worker, regardless of age, feels safe and committed to reach personal and corporate goals. This study proposes a holistic approach based on a participatory methodology to identify the causes of workplace hazards and to improve occupational health and safety in industry. The first step supports the identification of the root causes of accidents and injuries. The second step involves the participation of the workers in the analysis of the consequences and the causes of safety issues in their workplace. The last step investigates the process deficiencies that may impact on the safety performances of the work system. The participatory technique adopted in this paper is the focus group with the workers, based on the fault tree analysis method. The findings suggest that the causes of unsafe work conditions may be the result of inefficiencies and deficits in the work process. The proposed approach allows multiple benefits, including an increased commitment of the workers and an improved safety culture within the organization. Such improvements are critical, especially when a relevant part of the workforce includes aged workers with multiple years of experience with the investigated tasks and, consequently, prolonged time of exposure to the same risk factors.


2022 - Sustainable Circular Economy for the Integration of Disadvantaged People: A Preliminary Study on the Reuse of Lithium-Ion Batteries [Articolo su rivista]
Cordisco, Adriano; Melloni, Riccardo; Botti, Lucia
abstract

The circular economy is attracting the attention of governments and companies who recognize the importance of promoting a sustainable approach toward social and industrial development. The European Union requires EU State members to support a sustainable approach to improving the production and consumption of Waste Electrical and Electronic Equipment (WEEE). This paper supports the conceptualization of a sustainable circular economy model, proposing the reuse of lithium-ion batteries from WEEE. The aim is to define a circular economy-based production model for the reuse of waste lithium-ion batteries and support the inclusion of disadvantaged people in the recovery process, breaking the barriers of social discrimination. The activities introduced in this paper are part of a circular economy project for the social integration of disadvantaged people. In this paper, the preliminary results of the project are introduced, proposing a methodology for the disassembly of waste lithium-ion batteries. The disassembly line balancing proposed in this paper focuses on the need to include workers with physical, psychological, sensory, or intellectual limitations, as well as people experiencing communication difficulties. Future steps of the project will focus on the design of the assembly line to produce battery packs for pedal-assisted bicycles from the recovered lithium-ion cells.


2022 - Understanding human factors to improve occupational safety in manufacturing: a case study [Relazione in Atti di Convegno]
Botti, Lucia; Oliva, Maniva; Melloni, Riccardo
abstract

This paper investigates how the deviation of an industrial process from its optimal productivity, maintenance, and quality levels can lead to safety issues. An integrated approach was developed in 2021 to analyze the correlation between safety deficie- ncies and process inefficiencies. In this study, the proposed approach was adopted, aiming to identify potential connections between the safety issues that emerged from the previous investigations and the process inefficiencies. A case study describes the application of the proposed approach in an Italian company leader in the production of boilers for domestic and industrial heating and cooling systems. The findings show that the joint analysis of the results from the investigations in the proposed approach allows understanding the human factors in the investigated manufacturing process, i.e. the environmental, organizational, and job factors, and the human and individual characteristics which influence behavior at work in a way which can affect occupational safety.


2021 - An innovative integrated smart system for the safe management of de-energization in maintenance activities of assemblies of machinery [Relazione in Atti di Convegno]
Buffi, A.; Catarinucci, L.; Di Donato, L.; Gabbrielli, R.; Landi, L.; Melloni, R.; Patrono, L.
abstract


2021 - Analyzing the Dynamics of Work Accidents in Manufacturing to Understand “Reasonably Foreseeable Behaviors” [Relazione in Atti di Convegno]
Botti, Lucia; Melloni, Riccardo; Oliva, Maniva
abstract

This paper introduces a structured analysis of the leading causes of occupational accidents that occurred in the Italian manufacturing industry in the last decades. The aim of this research was to understand the human factors and the common causes of unsafe behaviors that may have determined the investi- gated accidents. The European Directive 2006/2/EC defines the essential health and safety requirements for the design of machinery for its intended purpose or for a purpose which can reasonably be foreseen. In this context, the present research supports the design of modern manufacturing systems, with the aim to investi- gate and understand workers’ reasonably foreseeable behaviors and to provide directions for prevention strategies. The results show the leading causes of such events as, for example, the adop- tion of an improper procedure or worker misplacement. The findings of this research will help practitioners and researchers understand the human behav- iors and the limits of the machinery, including the intended use and reasonably foreseeable misuses thereof.


2021 - Apparent and root causes of occupational accidents occurred during maintenance interventions [Relazione in Atti di Convegno]
Botti, L.; Oliva, M.; Di Donato, L.; Melloni, R.
abstract

This paper introduces the results of a structured analysis of occupational accidents occurred during maintenance interventions in Italy, in the last decades. The investigation includes 49 occupational accidents occurred in Italy between 2002 and 2016, involving maintenance workers. Results show that the leading apparent cause of accidents was the voluntary adoption of an improper procedure, e.g. the bypass of a risk control measure, followed by distraction and error of judgment. The lack of training appeared to be the leading root cause of the investigated events. However, the investigation of root causes was difficult because of the lack of information on human factors and other intermediate causes that lead to the occupational accident. The findings of this analysis suggest that a structured methodology for accident registration is required. Such methodology should collect data supporting the identification of the root causes of occupational accidents and workers’ reasonably foreseeable behaviors on which prevention strategies should focus.


2021 - Circular economy for sustainable building: environmental and economic impacts of a green mortar with foundry sand waste [Relazione in Atti di Convegno]
M., Bergonzoni; Melloni, R.; Botti, L.
abstract

The study of solid waste reuse and recycle for sustainable construction is attracting the attention of researchers and practitioners due to the low cost, the high availability and the potential properties of waste materials. This paper introduces a research aimed at analyzing the economic and environmental impacts of a sustainable construction material, i.e. an innovative green mortar. Such mortar was obtained from the reuse of the foundry sands of an Italian automotive company. The aim was to realize a sustainable product, proposing the reuse and the valorization of the wastage left over of a manufacturing process. In this paper, the characteristics of the green mortar as a cement aggregate replacement were investigated, together with the economic and the environmental impacts of such material. The methodologies adopted in this research include the Life Cycle Assessment of the green mortar and the cost-benefit analysis for the production process. The results confirm that the adoption of a circular economy-based management for the foundry sands would allow economic and environmental benefits for all the actors involved in the supply chain of the green mortar.


2021 - Kinematic Synthesis of a Tendon-Driven Robotic Arm [Capitolo/Saggio]
Figliolini, G.; Lanni, C.; Di Donato, L.; Melloni, R.; Bacchetta, A. P.
abstract

This paper deals with the kinematic synthesis of a planar tendon-driven robotic arm to remove skins by wine fermentation tanks, with three d.o.f.s and thus, one time redundant. This redundancy is required in order to obtain a deployable mechanism in the form of robotic arm, which shows a wide workspace, but occupies a small volume when fully flexed. The type and dimensional kinematic synthesis of the proposed robotic arm is developed through a serial combination of endless tendon-driven kinematic chains, which joints are remotely actuated. The synthesis methodology is first applied to a Cardan mechanism, a parallel motion generator, a robotic finger, and then, to the synthesis of the proposed robotic arm with the aim to satisfy the design specifications.


2020 - A Detailed Investigation on Apparent and Root Causes of Accidents in Manufacturing [Relazione in Atti di Convegno]
Botti, L.; Melloni, R.; Mosconi, S.; Oliva, M.
abstract

This paper introduces the results of the analysis of 118 occupational accidents occurred in Italy between 2002 and 2015, in manufacturing. The aim was to identify apparent and root causes of such events. Apparent causes are derived from the description of the accidents on reports. Results show that the leading apparent cause was the voluntary adoption of an improper procedure, e.g. the bypass of a risk control measure, followed by the improper use of equipment and lack of coordination. The investigation of root causes was difficult because of the lack of information on human factors and other intermediate causes that lead to the occupational accident. A structured methodology that collects data for the identification of the accident root causes is missing. The collection of such data would allow the identification of leading indicators for occupational accidents in manufacturing and, more specifically, for the mechanisms that cause fatal and serious injuries.


2020 - Mechatronic Design of a Robotic Arm to Remove Skins by Wine Fermentation Tanks [Relazione in Atti di Convegno]
Figliolini, G.; Di Donato, L.; Melloni, R.; Bacchetta, A. P.; Lanni, C.; Preziosi, C.; Rea, P.
abstract

The mechatronic design of a robotic arm to remove skins by wine fermentation tanks was developed, along with the building and testing of a first prototype, within the frame of the BRIC 2015 national research project on the confined spaces, which was funded by INAIL (National Institute for Insurance against Accidents at Work). In particular, the type synthesis of a specific endless tendon-driven mechanism with three d.o.f.s (degrees of freedom) that operates in the horizontal plane, and thus, one time redundant, is presented in this paper. Each moving link is remotely actuated by a stepper electric drive, since these motors are installed on the fixed frame with the aim to keep them outside the wine fermentation tank, and thus, allowing the passage of the robotic arm in closed configuration, through the manhole of the tank. This mechatronic device is aimed to avoid the working of the employees in confined and polluted spaces, and thus, to eliminate the hazards given by the skin removal by the fermentation vat, which is the most unsafe activity in wine manufacturing processes.


2020 - Order picking: A comparison of heuristic and meta-heuristic approaches [Relazione in Atti di Convegno]
Bertolini, M.; Melloni, R.; Neroni, M.
abstract

This paper investigates the impact of several routing strategies on minimization of the travel-time for pickers in a manual warehouse. Many solutions have been proposed in literature over the last years, however, just a few authors really compare them on equal terms in order to carry out a proper comparison. In this work, three well-known heuristic strategies (i.e. S-Shape, Largest Gap, and Combined) are firstly compared to each other and then with two metaheuristic algorithms owning to swarm intelligence family (i.e. Ant Colony Optimization and Particle Swarm Optimization). Firstly, an empirical study has been made to find out the best setting for meta-heuristics’ parameters. Then, a discrete event simulation model has been developed by using both Python© and Cython© programming languages, and the analyzed strategies have been compared under several storage assignment policies.


2020 - Web aided confined spaces risk assessment: Development of a web portal supporting the risk assessment of work in confined spaces [Relazione in Atti di Convegno]
Mosconi, S.; Bacchetta, A.; Di Donato, L.; Melloni, R.; Oliva, M.; Botti, L.
abstract

Past and recent statistics on industrial accidents show that work in confined spaces is a high-risk activity that frequently leads to multiple fatalities and serious injuries. The analysis of accidents dynamics reveals that the leading cause of such events is the lack of awareness about the risks that may be present within the confined space. This paper introduces an innovative web-based tool supporting employers, safety professionals and practitioners during the risk assessment of confined spaces in industry. The proposed tool is based on the Web Aided Confined Spaces Risk Assessment algorithm, i.e. a decisional flow chart that drives the user during each phase of the risk assessment for work in confined spaces. The aim was to support the prevention of occupational accidents during work in confined spaces and to promote the awareness about the risks of such activity. The proposed tool investigates critical issues dealing with confined spaces, e.g. the definition and the classification of confined spaces and the identification of hazards and risks, the qualification of the companies, the emergency and rescue procedures and the personal protective equipment. Two additional sections introduce a collection of previous cases of accidents in confined spaces and an archive of documents, e.g. reports and international regulations on work in confined spaces. Finally, a tutorial allows the interactive consultation of regulations, documents and media. A case study shows the application of the proposed tool to a grain silo and the investigation of the ordinary maintenance intervention performed inside the confined space. After completing the procedure with the flow chart, the user has proper information to make decisions about the confined space intervention. The dynamic structure of the web portal allows the user to interact with the contents by adding new case studies, work procedures and critical events, e.g. accidents, dangerous occurrences and near misses.


2019 - Mechatronic Design of a Robotic Arm to Remove Skins by Wine Fermentation Tanks [Abstract in Atti di Convegno]
Figliolini, Giorgio; Di Donato, Luciano; Melloni, Riccardo; Paolo Bacchetta, Adriano; Lanni, Chiara; Preziosi, Claudio; Rea, Pierluigi
abstract

The mechatronic design of a robotic arm to remove skins by wine fermentation tanks was developed, along with the building and testing of a first prototype, within the frame of the BRIC 2015 national research project on the confined spaces, which was funded by INAIL (National Institute for Insurance against Accidents at Work). The main motivation of this research is to avoid workers accident when operating inside confined spaces with pollution, as in the case of wine fermentation tanks. In fact, commonly, the removal of skins requires the entrance into the tank through the manhole access and the successive task of the worker by the inside, in order to push the skins out. Probably, this is the most labor-intensive aspects of winemaking and consequently, great care should be taken when entering a tank that has just finished fermentation due to the danger of asphyxiation from the residual carbon dioxide. Thus, acquired the design specifications by the industrial environment, in terms of shape and size of the most common wine fermentation tanks, the kinematic synthesis of a tendon-driven mechanism was formulated and then, developed the mechatronic design of a new robotic arm that is the subject of this paper. In particular, the tendon-driven mechanism of this 3R (Three-Revolute) robotic arm is one time redundant, since has 3 d.o.f.s in the horizontal plane, and it is also provided of specific hooks that are installed along a suitable chain transmission system with 1 d.o.f. Therefore, the removal of the skins from the wine fermentation tank can be performed by the robotic arm of Fig.1, because of the combination of two joint effects, the closing motion of the 3R planar mechanism, along with the action of the moving hooks to harvest the skins.


2019 - Participative ergonomics for the improvement of occupational health and safety in industry: a focus group-based approach [Relazione in Atti di Convegno]
Mosconi, S.; Melloni, R.; Oliva, Maniva; Botti, Lucia
abstract

This paper introduces a participative approach to the investigation and promotion of health and safety in industry. The proposed methodology promotes the active participation of the workers in the analysis of consequences and causes of unsafe behaviours that may result in work-related musculoskeletal disorders, accidents, injuries or near-misses. The developed participative technique is the Focus Group with Workers, based on the Fault Tree Analysis method (FGW-FTA). Focus groups are conventionally used by social and behavioural researchers to understand opinions, motivations, attitudes, and mental processes that underlie people behaviours. The innovative procedure in this paper addresses researchers and safety professionals during the focus groups with the workers for the identification of critical risk factors in the workplace. The result is a structured analysis, operated by and with the workers, for the identification of consequences and causes of unsafe behaviours. Finally, the developed methodology addresses the definition of a set of preventive and protective measures, and corrective actions for the improvement of health and safety in the workplace. An experimental study in an Italian boiler manufacturer describes the proposed methodology and the results of the focus groups with the workers. An evaluation questionnaire was elaborated to investigate the workers’ knowledge on occupational health and safety. A second questionnaire was developed to understand the workers’ perception on occupational risks. Each participant was invited to fill in both the questionnaires before and after the focus groups with the workers. The results of the study proved the effectiveness of the developed methodology in improving workers knowledge and perceptions on occupational health and safety.


2018 - Applicazione delle direttive ATEX per la valutazione del rischio esplosione in una officina farmaceutica [Relazione in Atti di Convegno]
Vignali, G.; Melloni, R.; Di Donato, L.; Gattamelata, D.
abstract

Nella maggioranza dei processi industriali, possono essere presenti ambienti sospetti di inquinamento con ad esempio polveri o sostanze volatili combustibili che, se innescate, possono provocare un’esplosione. Per garantire la sicurezza in tali impianti e gli ambienti ad essi associati, la comunit  europea ha emanato direttive che fissano i requisiti da applicare a tutti gli equipaggiamenti istallati in ambienti potenzialmente esplosivi. Nel caso di una officina farmaceutica spesso possono presentarsi situazioni pericolose, dovute appunto a zone inquinate che possono portare ad un rischio di esplosione. Questo lavoro intende illustrare una possibile procedura di valutazione basata sull’analisi FMEA al fine di identificare il componente pi  critico per le attrezzature analizzate. Tramite il tasso di guasto del componente, tenendo conto della zona e del tasso di inquinamento   stata inoltre definita la probabilit  di innesco efficace che moltiplicata per la probabilit  di avere atmosfera esplosiva ha portato ad ottenere il fattore di probabilit  totale. In funzione della cifra di rischio complessiva sono state quindi stabilite le misure protettive da adottare. In ultima analisi un elenco di interventi migliorativi e una stima dei costi   stata eseguita.


2018 - Strumenti web interattivi per supportare le PMI nella gestione della SSL orientata al miglioramento continuo [Relazione in Atti di Convegno]
Mosconi, Simone; Avino, M. R.; Gobba, F.; Iotti, A.; Zuccarello, G. A.; Melloni, R.
abstract

Il presente lavoro illustra un approccio metodologico, supportato da un applicativo web, per l’individuazione e la condivisione di azioni di prevenzione da attuare nel settore merceologico della metalmeccanica, con particolare attenzione alle attività di assemblaggio, fonte importante di malattie professionali che comportano disturbi muscolo scheletrici. L’approccio metodologico presentato è caratterizzato da un elevato grado di flessibilità per cui risulta estensibile a qualunque settore merceologico. La finalità del progetto proposto è lo sviluppo di strumenti di condivisione del patrimonio delle conoscenze in materia di salute e sicurezza sul lavoro, distribuito sulle diverse figure operanti a vario titolo nel mondo della produzione, finalizzato alla realizzazione di uno strumento web che consente la condivisione delle condizioni di pericolo, la raccolta e la messa in comune delle cause, spesso di natura comportamentale e organizzativa, l’individuazione delle azioni di prevenzione, al fine di facilitare gli attori della prevenzione e fornire un supporto efficace ai datori di lavoro, agli RSPP, agli RLS e ai preposti.


2016 - Key aspect of safety at work: A comprehensive literature review [Articolo su rivista]
Arcuri, MARIA CRISTINA; Gandolfi, Gino; Melloni, Riccardo
abstract

Safety at work is a challeging issue for firms and governments worldwide. This paper presents a comprehensive literature review on occupational accidents. We analyze causes of injury and risk factors, economic and social consequences, Occupational Health and Safety Management System areas of priority and effectiveness of interventions. We highlight the key role of workers and of prevention programs. Accident prevention is a means of reducing negative effects of accidents and increasing productivity. Furthermore, prevention can raise creditworthiness and lower insurance premiums.


2016 - Un Approccio a Rete per Migliorare l’Attività di Prevenzione nelle P.M.I. [Relazione in Atti di Convegno]
Melloni, R.; Mosconi, S.; Bacchetta, A.; Iotti, A.; Di Stefano, S.; Zuccarello, G.; Avino, M. R.
abstract

Il presente lavoro illustra la struttura di un progetto a rete, denominato “A Modena la sicurezza sul lavoro, in pratica”, che consente di facilitare la condivisione delle esperienze in materia di prevenzione sulla salute e sicurezza nei luoghi di lavoro. L’esperienza parte nel 2010 da un’idea progettuale sviluppata in collaborazione tra Inail sede di Modena e CRIS, Centro di Ricerca Interdipartimentale sulla Sicurezza e Prevenzione dei Rischi, dell’Università di Modena e Reggio Emilia. Il progetto si è poi sviluppato portando ad una vera e propria rete tra i principali promotori: Direzione Regionale Inail Emilia Romagna, principali Associazioni Datoriali, Ordini e Associazioni professionali ed Enti di controllo e vigilanza, nonché diverse Istituzioni, tra le quali la Prefettura di Modena. La prima azione per raggiungere gli obiettivi di prevenzione è stata la realizzazione di una struttura organizzativa, basata su un Comitato Tecnico Scientifico, e la dotazione di strumenti operativi quali le Comunità di Pratica, i Workshop Tematici e il coinvolgimento di Gruppi di Studenti. Sono state progressivamente coinvolte numerose aziende di produzione e dei servizi, che, nel tempo, si sono avvicinate al progetto riconoscendone l’utilità ai fini del miglioramento continuo delle attività di prevenzione dei rischi. È stato ideato lo strumento dei Focus Group con i Lavoratori (FGL), incontri con gruppi di 10 lavoratori al massimo di approfondimento dei rischi connessi alle mansioni svolte, che permettono di risalire alle criticità originarie e individuare soluzioni condivise. Ancora più interessante è l’emersione di near miss e di potenziali pericoli, non rilevabili agevolmente pur con un’attenta valutazione dei rischi, in un circuito virtuoso di miglioramento continuo. Altro aspetto di notevole importanza, connesso alle attività di FGL, è l’arricchimento di una base dati di rischi che può essere condivisa con aziende dello stesso settore merceologico, attraverso lo strumento delle Comunità di Pratica. Nel presente lavoro verranno descritti i diversi strumenti messi in campo e le relazioni che intercorrono tra loro anche attraverso un esempio di applicazione per le attività di montaggio manuale nelle linee di produzione del settore metalmeccanico e per lo specifico caso dell’installazione e manutenzione di bilance industriali.


2015 - La sorveglianza sanitaria per i lavoratori addetti ad attività in "ambienti sospetti di inquinamento" o confinati [Articolo su rivista]
Bacchetta, Adriano Paolo; Melloni, Riccardo; Collino, Francesca; Berri, Angelo; Taino, Giuseppe; Oddone, Enrico; Imbriani, Marcello
abstract

About medical aspects related to the work involving confined spaces Neil McManus, one of the leading world expert on the topic, points out that now a days, besides what is required for general work environmental, no specific data can be found in the literature on health surveillance programs for workers engaged in activities in confined environments. Although there are activities in confined environments, which may include the adoption of operating procedures and protection systems similar to those one used in manufacturing jobs (e.g. use of PPE as respiratory mask and protective clothing, etc.) we must, however, emphasize that activities in confined environments involve specific. working conditions of particular physical. psychological stress for employees. Working in these spaces has as consequences issues not found in other situations (being confined, difficulties in the movement, unable to access / exit, uncomfortable postures, etc.) and also, in emergency, it may involve difficulties with activities of first aid or extraction of the worker injured and in some cases even obstruct them. Therefore we believe that it is important to begin a debate on the topic and to indicate what should be the physical requirements of the employees who have been called to work in this particular workplace.


2014 - A Mono parameter analysis on a simulation model to support GALB heuristic optimization algorithms based on resource balancing [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Davoli, Giovanni; Govoni, Andrea; Longo, Francesco; Melloni, Riccardo; Murino, Teresa
abstract

This paper is based on previous work that presented an approach and the related model to solve a GALB problem, and to analyse a multi model manual assembly line, based on heuristic algorithm to optimize the scheduling of tasks to the available stations, respecting a set of restrictions, as task/station obligation, and aiming to optimize a multi objective function based on time and line balancing costs elements. The assembly line we considered, process a very large variety of items, that differ for size, features, optional, under the increasing market competition. In that previous work, quite all strategies about resource scheduling opportunities have been considered. In the present step, we consider the last system we worked on, with a doubled number of stations, to test the reaction to the values changes of some configuration parameter as Due Date, Tardiness Cost, Tardiness Penal, Man work Direct Labour Cost, or Station Saturation.


2014 - Digital human models (DHM) to simulate meat processing to prevent work-related musculoskeletal disorders (WR-MSDs) [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Melloni, Riccardo; Mosconi, Simone; Longo, Francesco
abstract

Work-Related Musculoskeletal Disorders (WRMSDs) are the leading cause of Occupational Disease in working populations of the advanced industrialized countries. The professional pathology of the upper limbs, from the 80's until today, is continuously increased to represent more than 50% of all occupational diseases. In literature many tools are available to perform the ergonomic assessment of the workplace. These tools and methods are classified based on the type of analysis that are able to perform and on the results that can provide. Beside the traditional methods of assessment, based on tabular theoretical methods, that commonly adopt paper check lists that refer to the main methods of analysis (NIOSH, OCRA, Snook & Ciriello, etc.), are available computer tools performing the same analysis, or, much more appropriate when it needs to make a more accurate biomechanical analysis. These methods provide numerical value indicating the level of risk to which workers are exposed.


2014 - La verifica d’integrità mediante ispezione visiva delle membrature interne di un generatore di vapore a tubi di fumo e applicazione del D.P.R. 177/2011 [Relazione in Atti di Convegno]
Zuccarello, Giovanni A.; Di Donato, Luciano; Melloni, Riccardo; Bacchetta, Adriano P.
abstract

Il presente lavoro prende in esame i problemi associati all’accesso all'interno delle attrezzature a pressione e, in particolare, nei generatori di vapore a tubi di fumo (soggetti a verifica biennale) per eseguire l’ispezione visiva del focolare e delle membrature interne, operazione quest’ultima per la quale l’ispettore deve normalmente accedere attraverso un passo d’uomo ellittico delle dimensioni di 300×400 mm e operare in un ambiente con dimensioni ristrette. Tale attività, in base al D.P.R. 177 del 2011, ricade nell’ambito delle attività in ambienti sospetti di inquinamento o confinati. L’obiettivo della ricerca in corso, è verificare se sia possibile, mediante l’adozione di metodi di analisi delle cause comuni di guasto, come la Risk-based Inspection (RBI), porre le basi per il superamento della logica deterministica legata a visite periodiche su base temporale fissa, a favore di valutazioni su base statistica. Se nell’ambito del Sistema Informativo Nazionale Prevenzione - SINP - fosse reso disponibile l’accesso a un’aggiornata banca dati relativa alle attrezzature a pressione installate, suddivise per tipologia e caratteristiche di esercizio, sarebbe possibile valutare la possibilità di ridurre la frequenza d’intervento di operatori all’interno del corpo di caldaia, limitando in tal modo l’esposizione al rischio connesso all’accesso dei verificatori e degli eventuali soccorritori.


2013 - Practical considerations about error analysis for discrete event simulations model [Relazione in Atti di Convegno]
Davoli, Giovanni; Nielsen, Peter; Pattarozzi, Gabriele; Melloni, Riccardo
abstract

The purpose of making efficient and flexible manufacturing systems is often related to the possibility to analyze the system considering at the same time a wide number of parameters and their interactions. Simulation models are proved to be useful to support and drive company management in improving the performances of production and logistic systems. However, to achieve the expected results, a detailed model of the production and logistic system is needed as well as a structured error analysis to guarantee results reliability. The aim of this paper is to give some practical guide lines in order to drive the error analysis for discrete event stochastic simulation model that are widely used to study production and logistic system. © IFIP International Federation for Information Processing 2013.


2013 - Safety storage assignment in as/rs [Relazione in Atti di Convegno]
Davoli, Giovanni; Govoni, Andrea; Gallo, Sergio Amedeo; Bortoli, Erika; Melloni, Riccardo
abstract

Picking time reduction has been the traditional perspective for warehouse optimization. When structural safety is considered, optimization of warehouse operations should be read even in terms of load mass distribution. In many practical cases the static safety of the system is related to mass distribution and barycenter highness, for example when a vehicle hits the structure or even in the extreme case of an earthquake. To investigate the problem a simulation model is developed with AutoMod™ software. The model developed simulates a generalized AS/RS warehouse where the single physical location is managed. To evaluated the performances of the AS/RS a simulation experiment is completed. The aim of the experiment is to investigate the impact of different storage policies on intrinsic structural safety and performances in term of picking time and comparing the results with the variety caused by different factors such as: shuttle speed and warehouse filling rate. © 2013 DIME UNIVERSITÀ DI GENOVA.


2013 - Simulation for safety engineering: A comparison between experimental data and fire models [Relazione in Atti di Convegno]
Govoni, Andrea; Davoli, Giovanni; Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

A comparison analysis has been conducted between experimental data of a concrete structure and three different models developed with CFAST, by NIST. This work concentrates on the possibility of modeling simplified fire objects. Full-scale experiments are simulated by two-layers zone models. Through a reverse approach on heat release rate estimation, a comparison between different models is reported analyzing time to flash over, maximum temperature, shape of the time-temperature curve. The possible use of these models as an engineering design tool is carried out. Results show that different ventilations lead to an uncertain time-temperature response. The benefits that should come from decomposition of fire load into many fire objects is counterbalanced by reduced accuracy due to increased model complexity and interactions between fire plumes. © 2013 DIME UNIVERSITÀ DI GENOVA.


2013 - Simulation model to analyze transport, handling, temporary storage and sorting issues: A valuable way to support layout, system definition and configuration and scheduling decision [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Melloni, Riccardo; Murino, Teresa
abstract

The following paper describes the use of simulation models to analyze a common production scenario in manufacturing plants: many assembly lines producing specific families of items in a large variety of versions; following handling and transport system, evaluated to be effective, costless, with an adequate capacity to be not the bottleneck of the whole system, and integrated with a storage/sorting system to decoupling the assembly phase and the following ones as completion/test and expedition phase, included recovery and reform of the expedition lot. To analyze a system like this, a simulation model has been developed with a flexible AGVs transport system, a Transit Point Warehouse acted by AS/RS, used also as sorting media. The size of the warehouse incoming bay, number of warehouse sub allocation zones or aisles, the capacity of all queues, all control logics for AGV's have been evaluated in a pre-modeling phase, and then evaluated by the model. © 2013 DIME UNIVERSITÀ DI GENOVA.


2013 - Simulation models to support galb heuristic optimization algorithms based on resource balancing based on multi objective performance index [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Davoli, Giovanni; Govoni, Andrea; Melloni, Riccardo
abstract

The following paper face with an approach to analyse a multi model manual assembly line, and the following heuristic algorithm to optimize the scheduling of tasks to the available stations, respecting of a set of restrictions, as task/station obligation, and aiming to optimize a multi objective function, based on time, balancing utilization rates, and line balancing costs elements. This problem can be considered as belonging to the wide area of GALB Problems. Some strategy about resource scheduling opportunities has been considered. The original referable configuration of the considered system is an assembly line with six stations, and with six operators. In the present step, the solution we experimented, shows a redundant (doubled) number of stations, to be a more flexible solution compared to previous solutions, with a layout too much specific and referred to the particular tasks and constrains profile, based on real data. © 2013 DIME UNIVERSITÀ DI GENOVA.


2012 - A proposed approach to extend the Economic Order Quantity (EOQ) model using discrete event simulation [Relazione in Atti di Convegno]
Davoli, Giovanni; Melloni, Riccardo
abstract

The economic order quantity (EOQ) and the economic production quantity (EPQ) are well-known and commonly used inventory control techniques. The standard results are easy to apply but are based on a number of unrealistic assumptions. One of the assumption is that the demand is normally distributed in any interval. In several practical cases the assumption about independence of successive demands, and consequently demand normal distribution in any interval, is not supported by real data. This paper investigates the effects on the expected service level (SL) after relaxing normal distribution assumption on the demand. The present work shows a possible strategy to use classic inventory model, such as EOQ/EPQ model, adopting discrete event simulation analysis to quantify model performances under relaxed assumptions. © 2012 IFIP International Federation for Information Processing.


2012 - Simulation models to support GALB heuristic algoritms and to evaluate multi objective performance index. [Relazione in Atti di Convegno]
Gallo, S. A.; Davoli, Giovanni; Govoni, Andrea; Melloni, Riccardo; Pattarozzi, GIAN LUCA
abstract

The following paper deal with an approach to analyze a multi model manual assembly line for oleo dynamic products, and the following heuristic algorithm to optimize the scheduling of tasks to the available stations, under the respect of a set of restrictions, as task/station obligation, and with the aim of optimize a multi objective function based on time and line balancing costs elements. This problem can be considered as belonging to the wide area of GALB Problems. Some strategy about resource scheduling opportunities has been considered. The original system was an assembly line with six stations, and, in the original and referable configuration, with six operators, but, under the spur of residual margins of the utilization ratios, as a improving evolutive strategy, an idea of evaluate opportunities of improving performances, by assembling coupled mixed items, feeding together the assembly line, have been evaluated, based on a twin mirror counterflowed line.


2011 - A proposed correction for the expected service level in the economic order quantity (EOQ) model under relaxed demand assumption [Relazione in Atti di Convegno]
Davoli, Giovanni; Melloni, Riccardo
abstract

The economic order quantity (EOQ) and the economic production quantity (EPQ) are well-known and commonly used inventory control techniques. The standard results are easy to apply but are based on a number of unrealistic assumptions. One of the assumption is that the demand is normally distributed in any interval. In several practical cases the assumption about independence of successive demands, and consequently demand normal distribution in any interval, is not supported by real data. This paper investigates the effects on the expected service level (SL) after relaxing normal distribution assumption on the demand. The present work shows a possible strategy to use classic inventory model, such as EOQ/EPQ model, adopting simulation analysis to quantify model performances under relaxed assumptions.


2011 - Key aspects to improve performances in wine bottling line: micro-failures and queues balancing [Relazione in Atti di Convegno]
Govoni, A.; Davoli, G.; Melloni, R.
abstract

This article describes a production line model based on constant machine rates, fixed finite buffer size and stochastic failure and repair behavior. The model is initialized with field data and validated on an Italian wine production industry. The production line behavior is simulated using a discrete event model. Using model results according with the proposed heuristic approach, the buffers capacity design is provided, according to system specifications and physical constrains. The analysis of the results shows that the production rate is significantly enhanced by buffers re-design. The methodology presented in this paper is applicable to many types of bottling lines and can be used in many industries to improve design and performances.


2010 - A proposed framework to introduce Lean Thinking in Healthcare Services [Relazione in Atti di Convegno]
Davoli, Giovanni; A., Govoni; Melloni, Riccardo
abstract

Healthcare services need, in all industrialized countries, an important part of the economic resources and ensuring sustainable healthcare services is critical for governments. Lean Production and Lean Thinking practices and concepts proved to be useful to improve performances and reduce costs in many industrial sectors. Lean Thinking generates positive results in services too, with some experiences even in healthcare. The present paper provides a literature review about Lean Thinking in healthcare and describes a work in progress experience of Lean implementation in healthcare services in Italy. The Lean practices adopted, the intervention areas and the results are analyzed to point out positive and negative aspects of each case study. Starting from this analysis a framework to introduce Lean in Healthcare Services is proposed.


2010 - A stochastic simulation approach for production scheduling and investment planning in the tile industry [Articolo su rivista]
Davoli, Giovanni; Gallo, Sergio Amedeo; M. W., Collins; Melloni, Riccardo
abstract

The present paper aims to develop a simulation tool for tile manufacturing companies. The paper shows how simulationapproach can be useful to support management decisions related to production scheduling and investment planning. Particularlythe aim is to demonstrate the importance of an information system in tile firms. The Factory Data Model (FDM) parameter isused to describe the activities in ceramic tile industries operating in different European countries. A process- based analysis oftile manufacturers is undertaken and individual company performance is quantified by Key Performance Indicators (KPI). Theoverall model is composed of different processes, which are coded into Scilab environment and matched together to arrange astochastic simulator. The simulations results are used to show how management decisions can significantly effect the KPIs. Thesimulations highlight the effects on KPIs of three specific parameters: the length of scheduling period, the quantity of stockneeded and the reliability of the information system supporting orders. The results clearly show that the effect of allowing thepresence of unattended orders within the outstanding orders list always has a remarkable negative influence on KPIs. Resultsalso suggest that the presence of sub-groups of homogeneous tiles, based on colour variation, is one of the most importantfactors affecting a tile manufacturer’s performance. The results of the simulations have two different practical implications.Firstly, they demonstrate the importance of information systems in tile companies, suggest to evaluate investment ininformation technology and indicate the value of promoting an information culture in the entire work forces. Secondly, theyshow the potential of simulation tools development to support decision making in a BPR (Business Processes Re-engineering)scenario.


2010 - Development of a simulation model to increase in-line buffer performances [Relazione in Atti di Convegno]
Davoli, Giovanni; A., Govoni; Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

The present paper aims to analyze an in-line buffer, composed of a belt conveyor system, by the use of discrete event simulation technique. The paper shows a case study relative to an engine production factory in the automotive field. The conveyor system is a dynamic buffer between engine production lines and testing stations. The aim of the analysis is to investigate the effects of different policies on testing stations balancing and lots management. In order to evaluate system performances different key performance indicators (KPIs) are considered. The system behavior is investigated under different conditions.


2010 - Lean Production in the ceramic industry: growth opportunities [Articolo su rivista]
Davoli, Giovanni; Gallo, Sergio Amedeo; A., Govoni; Melloni, Riccardo
abstract

I profondi cambiamenti imposti dalla globalizzazione a cui si sommano, oggi, gli effetti della crisi economico-finanziaria impongo alle aziende manifatturiere una ristrutturazione sia dei modelli organizzativi sia dei processi produttivi alla ricerca di una ritrovata competitività.Anche il settore ceramico viene sollecitato al cambiamento da una duplice e, per certi versi, contrastante esigenza. Da un lato la frammentazione del mercato impone lo sviluppo di un numero crescente di prodotti con cicli di vita che di anno in anno diventano più brevi. Dall’altra la presenza di una agguerrita concorrenza e le crescenti difficoltà nel reperimento di risorse impongono una modernizzazione dei processi produttivi tesa al contenimento dei costi tramite l’adozione di sistemi di produzione snella. La situazione odierna nel settore ceramico, per quanto riguarda la Lean Production (LP), vede ancora una scarsa diffusione delle pratiche tipiche della produzione snella. Il termine produzione snella (dall'inglese lean manufacturing o lean production) identifica una filosofia industriale che mira a minimizzare gli sprechi fino ad annullarli. Il processo produttivo, quindi, viene trattato in modo globale al fine di ridurre al massimo la complessità della produzione puntando sulla sua flessibilità e coinvolgendo fin dall'inizio tutte le funzioni aziendali.


2009 - A modular modelling approach to stochastic simulation of production – logistic systems [Relazione in Atti di Convegno]
Davoli, Giovanni; Gallo, Sergio Amedeo; A., Govoni; Melloni, Riccardo
abstract

The economic scenario today is highly competitive in terms of costs and number of competitors, so it isnecessary to adopt strategies that allow the constant improvement of manufacturing processes withinthe spending constrains. Simulation models are useful to support and drive company management inimproving the performances of production and logistic systems. The costs of simulation modeldevelopment could be reduced by the reuse of some of its parts. This work presents a case studyconcerning stochastic modeling of a small manufacture operating into the wood products field. Amodular simulation model composed of reusable sub-models has been developed using AutoMod™software package. The aim of the modular architecture is to allow the use of sub-models in differentproduction systems with little changes, decreasing the costs of development in order to became moreaffordable in a SME (small medium enterprise) contest.


2009 - Analysing the ceramic sector using processes and simulation models [Articolo su rivista]
Davoli, Giovanni; Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

Industrial simulation involves making a virtual representationof a complex entity such as a ceramic company.Without needing to interact physically with the plant, thistechnique allows technical and economic performanceindicators to be evaluated, plant engineering andorganisational alternatives to be tried out and the mostsuitable solutions found for reducing investment andoperating costs and limiting industrial risks. These analyses areperformed by means of dedicated software platforms thatcreate a model of the company and its processes.


2009 - Metodologie di valutazione del rischio [Capitolo/Saggio]
Melloni, Riccardo
abstract

La normativa vigente in materia di salute e sicurezza sul lavoro pone l’accento sull’adozione di modelli organizzativi e di gestione che favoriscano un processo di miglioramento continuo e garantiscano il rispetto di tutti gli obblighi giuridici che un’impresa deve assolvere.Cardine di questi modelli è la valutazione dei rischi che deve essere finalizzata ad individuare le adeguate misure di prevenzione e di protezione e ad elaborare il programma delle misure atte a garantire il miglioramento nel tempo dei livelli di salute e sicurezza. Tuttavia nel tempo sono stati sviluppati molteplici metodi che differiscono sia per il tipo di approccio che per le caratteristiche degli output. Non è possibile, comunque, identificare un modello che sia superiore a tutti gli altri e non si ritiene possibile che venga definito a livello normativo anche se nel decreto viene specificato che dovranno essere identificate le procedure standardizzate di effettuazione della valutazione dei rischi che devono, però, tenere conto dei profili di rischio e degli indici infortunistici di settore.Nel presente lavoro, al fine di permettere l’individuazione di modelli di valutazione idonei alle specifiche realtà da analizzare, vengono descritti i criteri generali che governano l’analisi dei rischi e i principali metodi di valutazione dei rischi. Per ciascun metodo di valutazione dei rischi sono presentati i limiti di applicabilità e viene messa in evidenza l’adeguatezza per il perseguimento degli obiettivi specifici che possono essere fissati.


2009 - VirtES (Virtual enterprise Simulator): a proposed methodology for enterprise simulation modeling [Relazione in Atti di Convegno]
Davoli, Giovanni; Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

In this paper a methodology to develop simulation models is presented. The methodology is based on amulti-level simulation model which allows flexibility and process analysis. The present work starts fromapplied researches in different SME enterprises. Enterprise management often needs easy and fastdeveloped tools to increase production capacity and flexibility. In many cases performances increase ispossible only adopting a BPR (business processes reengineering) approach. Nevertheless the resistanceto a BPR approach is underlined in recent bibliography. The proposed approach consists of a three stagesmethodology, named VirtES (Virtual Enterprise Simulator). VirtES methodology was first applied toceramic tiles enterprises. The results achieved encourage the adoption to other industrial field.


2008 - An improved step on evaluation of using a generic simulation package for processes to support SPR techniques as PERT and CPM [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Melloni, Riccardo; Davoli, Giovanni
abstract

This paper represents an attempt to evaluate how a software tool to model and simulate process can support typical activities that any Project Manager commonly perform, and to enforce his work. In detail, It will be represented the whole work of programming activities, resources scheduling (man work especially), and their definition in team; moreover, we will see costs definition and planning, and the related control activity, and finally, periodical activities of progress control, and the following corrective actions. Structure, logics, any parameter and terminology in the model have been inspired to Network Programming Systems (NPS) like PERT, CPM, Man Scheduling, RAMPS, etc., of whom has been kept attitudes, conditioned just by specific most relevant needs in our contest and, stimulated, by opportunities offered by specific software simulating tool adoption. The case of project and process we referred to, is the activities flow deployed to reply to a commercial proposal and related price estimation for some equipment for tiles production in the ceramic field, and, under hypothesis of acceptance, the necessary following work flow to design, to produce and to supply and test at the customer plant. We adopted this hypothesis based on the big experience with this kind of equipment and of plants in this field, that made easier focus on the idea and on example we built, and to validate the hypothesis; on other hand, because in the case and contest we proposed, it should be more justified the burden to represent in a simulating model the entire flow of activities related to the project, in terms of time, cost, and effort, and should be easier replicate some part of the model structure, logics, and others, because of analogies that distinct project should present. Under these considerations, it’s possible obtain some structural repeatability, also if in light and apparent opposition with characteristics of uniqueness that each project has, under the most commons definitions about PM in literature. The use of a simulating “general purpose” SW should be achievable also to SME’s present in a so large amount in the Italian contest. Software tool is Arena of Rockwell.


2008 - ANALYSIS OF INDUSTRIAL PROCESSES BASED ON INTEGRATION OF DIFFERENT SIMULATION TOOLS [Relazione in Atti di Convegno]
Davoli, Giovanni; Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

The present paper provides an example of software tools integration in order to perform simulations incomplex industry models, such as a ceramic tile manufacture. The first part of the paper presents thefeatures of the two simulation tools adopted: AutoMod™ and VirtES. AutoMod™ is a commercial suiteof simulation tools witch provides an environment easy to develop highly accurate models for analysis.VirtES simulation tool was developed by the Industrial Plants Research Group of the Department ofIndustrial and Civil Engineering (DIMeC) of the University of Modena and Reggion Emilia. Modelsdeveloped in VirtES are useful to investigate macro Key Performances Indicators (KPI), such aseconomic indicators. The integrated used of VirtES and AutoMod™ allows to perform accuratesimulation at line production level developed by AutoMod™ in multiple virtual scenarios created byVirtES.


2007 - Valutazione della scelta di una soluzione alternativa di sistema per il trasporto motori con tecniche simulative: il caso Lombardini Motori [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

Il seguente studio si inquadra nella attività di collaborazione con l’azienda Lombardini Motori di Reggio Emilia, infatti,era già era stato analizzato in precedenza il sistema di trasporto dei motori tra i vari reparti (limitatamente allaporzione di processo che va dall’assemblaggio fino al magazzino spedizioni), i cui risultati sono stati presentati inuna precedente memoria. In questo lavoro si è cercata una soluzione alternativa al sistema preesistente perassicurare un aumento dell’efficienza, ed in particolare, un maggior livello di controllo informativo del trasferimento,una maggiore capacità di seguire ed adattarsi all’evoluzione del contesto produttivo che tende all’aumento del livellotecnologico, della flessibilità, della variabilità del mix e dei volumi produttivi. L’attuale sistema di movimentazione èun nastro trasportatore ad anello chiuso, piuttosto obsoleto, che costeggia e collega i vari reparti in cui vengonoeseguite le progressive lavorazioni. Le limitazioni riscontrabili nell’uso dell’attuale del nastro trasportatore sonorisultate 1) limitazioni relative al controllo dello smistamento dei vari tipi di motore ai vari gruppi freno, distinti pertipologia di collaudo effettuabile; 2) criticità relative alla rintracciabilità e alla tracciabilità dei motori, ed alla rottura deilotti sequenziali ed omogenei di motori; 3) la incapacità di supportare variazioni di allocazione dei banchi prova inrisposta alle variazioni di mix; 4) l’elevato impegno di lavoro ausiliario umano per complementare il sistema ditrasporto. Il sistema che è risultato più convincente per una valutazione in simulazione è risultato essere un LaserGuided Vehicle System (LGVS). La modellazione è stata effettuata utilizzando il pacchetto Arena 8.0 della RockwellSoftware.


2007 - Valutazione dell’uso di un Applicativo di Simulazione di Processi Generico a Supporto delle Tecniche dei SPR quali PERT e CPM [Relazione in Atti di Convegno]
Gallo, Sergio Amedeo; Melloni, Riccardo
abstract

Questo lavoro rappresenta un tentativo di valutare l’uso di uno strumento SW per la modellazione e lasimulazione a supporto delle attività tipiche che un Project Manager esegue per la conduzione di unprogetto per potenziarne le capacità. In particolare verrà rappresentata e trattata la attività diprogrammazione delle attività, schedulazione delle risorse umane e definizione in squadre, lapianificazione dei costi e loro controllo, nonché le attività periodiche di controllo avanzamento ed i relativiinterventi correttivi. La struttura, lo strumento, le logiche, le determinazioni e terminologia usata nellamodellazione saranno ispirate ai metodi degli SPR: PERT, CPM, Man Scheduling, ecc., di cui si è cercatodi acquisire le prerogative, ispirati dalle necessità del contesto della nostra ipotesi, e dalle opportunitàofferte dall’uso dell’applicativo di simulazione. L’ipotesi di processo o progetto cui si è fatto riferimento èquella di predisposizione di un preventivo e relativa fornitura di equipaggiamenti ed impianti di produzioneper il settore ceramico, a partire dal recepimento ed elaborazione nel sistema aziendale di una richiestafornitura e delle relative specifiche, scelta dettata, da un lato per una certa conoscenza diretta dellecaratteristiche di tali sistemi produttivi e delle aziende di impiantistica nel settore, e quindi, una maggiorepossibilità di validazione dell’esempio, per altri aspetti, per la considerazione che l’onere dirappresentazione in un modello di simulazione del flusso delle attività correlate a questo contesto, intermini di tempo, costo ed impegno, avesse opportunità di essere ammortizzato in relazione alle analogieche presentano le diverse richieste di fornitura, configurandosi un aspetto di parziale ripetibilità strutturale,anche se in apparente contrasto con le caratteristiche di unicità che ogni progetto presenta, secondo ladefinizione propria delle trattazioni sul Project Management (PM). L’utilizzo dell’applicativo di simulazionegeneral purpose è abbordabile anche per le piccole aziende di fornitura impiantistica, particolarmentenumerose nel contesto italiano. Il pacchetto SW utilizzato è Arena della Rockwell.


2005 - Life Cycle Analsis of a Hydraulic Gear Motor [Relazione in Atti di Convegno]
Bertolini, M.; Bevilacqua, M.; Gallo, S.; Melloni, R.; Pancaldi, E.
abstract

In this paper, the Life Cycle Analysis (LCA) methodology is applied to assess the environmental performance of the production and usage of an aspirator/compressor for zootechnical application. The processes were analysed to investigate the whole production system from “cradle to grave”, considering the main phases: raw material production, component manufacturing, pump assembly, installation process, utilisation and disposal cycles. All the input/output streams of energy and mass were analysed and the environmental impact was rated with the aim of “Eco-Indicator ‘99” assessing method. The obtained results are evaluated and presented, and possible modifications of the system are suggested to obtain suitable improvements.


1996 - Air pollution due to an oil refinery: Correlation analysis to meteorological conditions [Relazione in Atti di Convegno]
Bevilacqua, M.; Giacchetta, G.; Melloni, Riccardo; Rimini, Bianca
abstract

This paper analizes gaseous pollutant flow rates released by an oil refinery


1995 - Quality Management for Packaging in the Food Industry [Relazione in Atti di Convegno]
Rimini, Bianca; Melloni, Riccardo
abstract

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1995 - Tabu search for the single machine sequencing problem with ready times [Relazione in Atti di Convegno]
Braglia, M; Melloni, Riccardo
abstract

The present work considers the reduction of the mean completion time and the makespan in the single machine scheduling problem with ready times. A Tabu-Search-based heuristic procedure is proposed to find the sequence that allows to reach a value of the cost function as close as possible to the global minimum. Computational tests are carried out to compare the performance of the Tabu Search procedure with those of other heuristics. Comparisons are made both in terms of mean completion time and makespan.


1995 - Valutazione economica di impianti per l'industria mangimistica [Relazione in Atti di Convegno]
Rimini, Bianca; Melloni, Riccardo
abstract

-


1994 - Problemi di congestionamento nelle testate di magazzini robotizzati [Relazione in Atti di Convegno]
G., Ferretti; Melloni, Riccardo; Rimini, Bianca
abstract

-


1994 - Valutazione delle relazioni esistenti tra lotto economico di produzione e JIT [Relazione in Atti di Convegno]
G., Ferretti; Melloni, Riccardo; Rimini, Bianca
abstract

-


1990 - Experimental and numerical analysis of fluid-structure interaction effects in a fast reactor core [Articolo su rivista]
Martelli, Alessandro; Forni, Massimo; Melloni, Riccardo; Paoluzzi, Roberto; Bonacina, Giuseppe; Castoldi, Aldo; Zola, Maurizio
abstract

Dynamic experiments in air and water (simulating liquid sodium) were performed by ISMES, on behalf of ENEA, on various core element groups of the Italian PEC fast reactor. Bundles of one, seven and nineteen mock-ups reproducing fuel, reflecting and neutron shield elements in full scale were analysed on shaking tables. Tests concerned both groups of equal elements and mixed configurations which corresponded to real core parts. The effects of PEC core-restraint ring were also studied. Seismic excitations of up to 2.5 g were applied to core diagrid. Test results were analysed by use of the one-dimensional program CORALIE and the two-dimensional program CLASH. The study allowed the fluid effects in the PEC core to be evaluated; it also contributed to validation of the above mentioned programs for their general use for fast reactor core analysis. This paper presents the main features of the experimental and the numerical studies and reports comparisons between calculations and measurements.


1988 - Detailed Comparison Between Computed and Measured FBR Core Seismic Responses [Relazione in Atti di Convegno]
Forni, M.; Martelli, A.; Melloni, Riccardo; Bonacina, G.
abstract

A detailed comparison between computed and Measured FBR Core Seismic Responses


1987 - EVALUATION OF FLUID EFFECTS ON THE DYNAMIC RESPONSE OF A FAST REACTOR CORE [Relazione in Atti di Convegno]
Melloni, Riccardo
abstract

The results of dynamic experiments on shaking tables, carried out in water (simulating sodium) on both single and coupled core element prototypes and core simplified mock-up configurations of the Italian PEC fast reactor test facility, with excitation gradually increasing up to above Safe Shutdown Earthquake, have been analysed by use of the one-dimensional computer program CORALIE and the two-dimensional program CLASH. The study confirmed the conservative nature of the PEC core design calculations, provided the natural frequency and damping values to be used in the calculations for the Final Safety Report, and allowed the fluid-structure interaction model to be assessed for the PEC core seismic analysis. It also contributed to the validation of the above-mentioned computer codes for their general use for the fast reactor core analysis as well as to a better understanding of fluid-structure interaction problems concerning the fast reactor core.