the complexity in manufacturing management science has nowadays increased due to the effort to im... more the complexity in manufacturing management science has nowadays increased due to the effort to improve performance evaluation tools by adding the possibility to describe the parameters variability not only in probabilistic terms but also in a possibilistic way. The goal may be reached by exploiting Fuzzy Sets theory, which offers all the necessary mathematical foundations to analyze problems from the
The International Journal of Advanced Manufacturing Technology
The Buffer Allocation Problem is a well-known optimization problem aiming at determining the opti... more The Buffer Allocation Problem is a well-known optimization problem aiming at determining the optimal buffer sizes in a manufacturing system composed by various machines decoupled by buffers. This problem still has scientific relevance because of problem complexity and trade-off between conflicting goals. Moreover, it assumes industrial relevance in reconfigurable manufacturing lines, where buffer sizes can be easily adapted to the production scenario. This work proposes a novel algorithm integrating performance evaluation and optimization by means of throughput cuts based on a linear approximation. Numerical results show the validity of the proposed approach with respect to the traditional gradient-based method. Moreover, an industrial case study integrating the proposed approach into a decision-support system for the buffer allocation and reallocation is analyzed.
ABSTRACT The paper investigates the problem of designing Focused Flexibility Manufacturing System... more ABSTRACT The paper investigates the problem of designing Focused Flexibility Manufacturing Systems (FFMSs) in face of alternative uncertain future demand scenarios. By using the framework of stochastic programming, it elaborates a detailed modeling and multi-stage solution approach. In order to handle the complexity inherent in alternative evolutions of a system design, a series of decomposition methods are presented that make the problem solvable even for instances of realistic size and high complexity.
Artificial Neural Nets and Genetic Algorithms, 1995
Scope of this paper is to investigate the applicability of Genetic Algorithms to the solution of ... more Scope of this paper is to investigate the applicability of Genetic Algorithms to the solution of Static Permutation Flowshop problem and to compare their performance with those obtained with Taboo Search Algorithms. Since in order to obtain good results with Genetic Algorithms (Gas) it is necessary to tune a set of parameters, then a second purpose of the study is to devise a methodology to perform this tuning. The methodology used is the “Response Surface Methodology”.
Volume 1: Advanced Energy Systems; Advanced and Digital Manufacturing; Advanced Materials; Aerospace, 2008
Long and medium-term production planning are tools to match production orders and resources capab... more Long and medium-term production planning are tools to match production orders and resources capability but can also be used as baseline for material procurement. In some systems, however, to reduce the complexity of the planning problem, distinct production operations are aggregated into activities which normally represent production phases. This is the case of some Manufacturing-to-Order and Engineering-to-Order Systems. The lack of a detailed schedule of the manufacturing operations can cause difficulties in providing a proper Material Requirements Planning and can affect the feasibility of the production plan. The paper proposes an approach to extract scheduling information from a production plan, grounding on the knowledge of the production process, to support material procurement. Once a criterion to aggregate operations is chosen and the plan devised, the description of production operations and their precedence relations are used to obtain temporal ranges for production opera...
The paper proposes a method for defining and developing class objects in an Arena® software envir... more The paper proposes a method for defining and developing class objects in an Arena® software environment. The idea is to capture some properties of OOS (Object Oriented Simulation) in the Arena environment, that is known to be easy to use in practical applications, thus obtaining the advantages of OOS in an easy context. The paper contains a definition of resource
The decision on production system acquisition for the automotive industry is very critical, given... more The decision on production system acquisition for the automotive industry is very critical, given the number of different aspects to be considered. Indeed different automated solutions are feasible and evaluation techniques that take into account all the critical issues are needed to ...
... the equipment selection process G. Manassero', Q. Semerarol, T. Toliol(2) Politecnic... more ... the equipment selection process G. Manassero', Q. Semerarol, T. Toliol(2) Politecnico di Milano, Dipartimento di Meccanica, Piazza Leonard0 da Vinci, 32 - 20133 ... In the first article[4], Vargas tries to demonstrate that if the judgements in a matrix are gamma distributed variables ...
International Journal of Production Research, 2003
An innovative approach to maximize throughput in dial indexes flow lines provided by an automatic... more An innovative approach to maximize throughput in dial indexes flow lines provided by an automatic and synchronous part transfer mechanism is outlined. In this class of production systems, the performance measures are directly related to the control operating method, defined as the schedule of activities performed by the part transport mechanism and the workstations during each dial cycle. Usually, a
Shortening product life cycles leads competing companies to continually realise new products or m... more Shortening product life cycles leads competing companies to continually realise new products or modifying the existing ones; this is one of the major issues in production system design. According to changes in product features, production systems need to be properly configured or reconfigured to efficiently tackle new production requirements. This paper illustrates a method for designing multiproduct flexible transfer lines and represents a step toward the creation of a tool that supports manufacturers in making configuration choices. The paper reports the application of the developed approach to industrial cases to design machining transfer line producing a mix of mechanical parts.
the complexity in manufacturing management science has nowadays increased due to the effort to im... more the complexity in manufacturing management science has nowadays increased due to the effort to improve performance evaluation tools by adding the possibility to describe the parameters variability not only in probabilistic terms but also in a possibilistic way. The goal may be reached by exploiting Fuzzy Sets theory, which offers all the necessary mathematical foundations to analyze problems from the
The International Journal of Advanced Manufacturing Technology
The Buffer Allocation Problem is a well-known optimization problem aiming at determining the opti... more The Buffer Allocation Problem is a well-known optimization problem aiming at determining the optimal buffer sizes in a manufacturing system composed by various machines decoupled by buffers. This problem still has scientific relevance because of problem complexity and trade-off between conflicting goals. Moreover, it assumes industrial relevance in reconfigurable manufacturing lines, where buffer sizes can be easily adapted to the production scenario. This work proposes a novel algorithm integrating performance evaluation and optimization by means of throughput cuts based on a linear approximation. Numerical results show the validity of the proposed approach with respect to the traditional gradient-based method. Moreover, an industrial case study integrating the proposed approach into a decision-support system for the buffer allocation and reallocation is analyzed.
ABSTRACT The paper investigates the problem of designing Focused Flexibility Manufacturing System... more ABSTRACT The paper investigates the problem of designing Focused Flexibility Manufacturing Systems (FFMSs) in face of alternative uncertain future demand scenarios. By using the framework of stochastic programming, it elaborates a detailed modeling and multi-stage solution approach. In order to handle the complexity inherent in alternative evolutions of a system design, a series of decomposition methods are presented that make the problem solvable even for instances of realistic size and high complexity.
Artificial Neural Nets and Genetic Algorithms, 1995
Scope of this paper is to investigate the applicability of Genetic Algorithms to the solution of ... more Scope of this paper is to investigate the applicability of Genetic Algorithms to the solution of Static Permutation Flowshop problem and to compare their performance with those obtained with Taboo Search Algorithms. Since in order to obtain good results with Genetic Algorithms (Gas) it is necessary to tune a set of parameters, then a second purpose of the study is to devise a methodology to perform this tuning. The methodology used is the “Response Surface Methodology”.
Volume 1: Advanced Energy Systems; Advanced and Digital Manufacturing; Advanced Materials; Aerospace, 2008
Long and medium-term production planning are tools to match production orders and resources capab... more Long and medium-term production planning are tools to match production orders and resources capability but can also be used as baseline for material procurement. In some systems, however, to reduce the complexity of the planning problem, distinct production operations are aggregated into activities which normally represent production phases. This is the case of some Manufacturing-to-Order and Engineering-to-Order Systems. The lack of a detailed schedule of the manufacturing operations can cause difficulties in providing a proper Material Requirements Planning and can affect the feasibility of the production plan. The paper proposes an approach to extract scheduling information from a production plan, grounding on the knowledge of the production process, to support material procurement. Once a criterion to aggregate operations is chosen and the plan devised, the description of production operations and their precedence relations are used to obtain temporal ranges for production opera...
The paper proposes a method for defining and developing class objects in an Arena® software envir... more The paper proposes a method for defining and developing class objects in an Arena® software environment. The idea is to capture some properties of OOS (Object Oriented Simulation) in the Arena environment, that is known to be easy to use in practical applications, thus obtaining the advantages of OOS in an easy context. The paper contains a definition of resource
The decision on production system acquisition for the automotive industry is very critical, given... more The decision on production system acquisition for the automotive industry is very critical, given the number of different aspects to be considered. Indeed different automated solutions are feasible and evaluation techniques that take into account all the critical issues are needed to ...
... the equipment selection process G. Manassero', Q. Semerarol, T. Toliol(2) Politecnic... more ... the equipment selection process G. Manassero', Q. Semerarol, T. Toliol(2) Politecnico di Milano, Dipartimento di Meccanica, Piazza Leonard0 da Vinci, 32 - 20133 ... In the first article[4], Vargas tries to demonstrate that if the judgements in a matrix are gamma distributed variables ...
International Journal of Production Research, 2003
An innovative approach to maximize throughput in dial indexes flow lines provided by an automatic... more An innovative approach to maximize throughput in dial indexes flow lines provided by an automatic and synchronous part transfer mechanism is outlined. In this class of production systems, the performance measures are directly related to the control operating method, defined as the schedule of activities performed by the part transport mechanism and the workstations during each dial cycle. Usually, a
Shortening product life cycles leads competing companies to continually realise new products or m... more Shortening product life cycles leads competing companies to continually realise new products or modifying the existing ones; this is one of the major issues in production system design. According to changes in product features, production systems need to be properly configured or reconfigured to efficiently tackle new production requirements. This paper illustrates a method for designing multiproduct flexible transfer lines and represents a step toward the creation of a tool that supports manufacturers in making configuration choices. The paper reports the application of the developed approach to industrial cases to design machining transfer line producing a mix of mechanical parts.
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Papers by Tullio Tolio