Proceedings 1992 IEEE International Conference on Robotics and Automation, 1992
ABSTRACT The authors deal with the problem of part flow management in a class of assembly systems... more ABSTRACT The authors deal with the problem of part flow management in a class of assembly systems characterized by a serial transportation system connecting the workstations. The system assembles a number of identical units, each requiring a set of operations. Each operation is performed by a workstation and each workstation can perform any operation. The problem consists of assigning the operations to the workstations to maximize some productivity index of the system. Usually, a tree-like precedence relationship exists among the operations (assembly tree). The problem is analyzed for the case in which a dominating path on the assembly tree exists. A polynomial time dynamic programming algorithm is presented for the optimal assignment of operations to workstations
Proceedings. 1991 IEEE International Conference on Robotics and Automation, 1991
Some optimization models for the problem of tool management in flexible manufacturing cells are p... more Some optimization models for the problem of tool management in flexible manufacturing cells are presented. The cell considered consists of two machines (working centers) in charge of executing a set of part programs. The tools required by the machining operations are located in a central tool magazine and are moved to the machines by a tool handling system consisting of two shuttles and one robot. The robot picks and places the tools from/in the magazine; each shuttle exchanges the tools with the robot and with the machine. The problem is to synchronize the robot and shuttle moves in order to maximize the cell productivity (minimize the machines' idle time). Two different models are proposed for the situation in which a configuration of tools in the magazine is given and in which a budget for tool purchasing is fixed
1985 24th IEEE Conference on Decision and Control, 1985
It is known that control of a rigid robot arm can easily be achieved via static state-feedback co... more It is known that control of a rigid robot arm can easily be achieved via static state-feedback compensation of the nonlinearities. However, in many practical situations, the elasticity in gear boxes is not negligible. If this is the case, the use of such a control technique is not possible anymore because neither is the system feedback equivalent to a controllable
This paper deals with the material flow management in a large-scale manufacturing process, namely... more This paper deals with the material flow management in a large-scale manufacturing process, namely the assembly of automobiles in a highly automated plant in Italy. After a detailed description of the plant from the viewpoint of material flow issues, the modeling process and the methodologies employed to address the problems are illustrated. The decision models were validated by means of
Proceedings 1992 IEEE International Conference on Robotics and Automation, 1992
ABSTRACT The authors deal with the problem of part flow management in a class of assembly systems... more ABSTRACT The authors deal with the problem of part flow management in a class of assembly systems characterized by a serial transportation system connecting the workstations. The system assembles a number of identical units, each requiring a set of operations. Each operation is performed by a workstation and each workstation can perform any operation. The problem consists of assigning the operations to the workstations to maximize some productivity index of the system. Usually, a tree-like precedence relationship exists among the operations (assembly tree). The problem is analyzed for the case in which a dominating path on the assembly tree exists. A polynomial time dynamic programming algorithm is presented for the optimal assignment of operations to workstations
Proceedings. 1991 IEEE International Conference on Robotics and Automation, 1991
Some optimization models for the problem of tool management in flexible manufacturing cells are p... more Some optimization models for the problem of tool management in flexible manufacturing cells are presented. The cell considered consists of two machines (working centers) in charge of executing a set of part programs. The tools required by the machining operations are located in a central tool magazine and are moved to the machines by a tool handling system consisting of two shuttles and one robot. The robot picks and places the tools from/in the magazine; each shuttle exchanges the tools with the robot and with the machine. The problem is to synchronize the robot and shuttle moves in order to maximize the cell productivity (minimize the machines' idle time). Two different models are proposed for the situation in which a configuration of tools in the magazine is given and in which a budget for tool purchasing is fixed
1985 24th IEEE Conference on Decision and Control, 1985
It is known that control of a rigid robot arm can easily be achieved via static state-feedback co... more It is known that control of a rigid robot arm can easily be achieved via static state-feedback compensation of the nonlinearities. However, in many practical situations, the elasticity in gear boxes is not negligible. If this is the case, the use of such a control technique is not possible anymore because neither is the system feedback equivalent to a controllable
This paper deals with the material flow management in a large-scale manufacturing process, namely... more This paper deals with the material flow management in a large-scale manufacturing process, namely the assembly of automobiles in a highly automated plant in Italy. After a detailed description of the plant from the viewpoint of material flow issues, the modeling process and the methodologies employed to address the problems are illustrated. The decision models were validated by means of
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