Abstract
This paper deals with the formal modeling and verification of reconfigurable and energy-efficient manufacturing systems (REMSs) that are considered as reconfigurable discrete event control systems. A REMS not only allows global reconfigurations for switching the system from one configuration to another, but also allows local reconfigurations on components for saving energy when the system is in a particular configuration. In addition, the unreconfigured components of such a system should continue running during any reconfiguration. As a result, during a system reconfiguration, the system may have several possible paths and may fail to meet control requirements if concurrent reconfiguration events and normal events are not controlled. To guarantee the safety and correctness of such complex systems, formal verification is of great importance during a system design stage. This paper extends the formalism reconfigurable timed net condition/event systems (R-TNCESs) in order to model all possible dynamic behavior in such systems. After that, the designed system based on extended R-TNCESs is verified with the help of a software tool SESA for functional, temporal, and energy-efficient properties. This paper is illustrated by an automatic assembly system.
Highlights
A reconfigurable manufacturing system (RMS) is designed at the outset for rapid change in structure, as well as in hardware and software components, in order to quickly adjust production capacity and functionality within a part family in response to sudden changes in market or in regulatory requirements [1]
This paper extends the formalism reconfigurable timed net condition/event systems (R-TNCESs) in order to model all possible dynamic behavior in such systems
A RMS should be designed with several configurations to, respectively, meet different production requirements in various conditions
Summary
A reconfigurable manufacturing system (RMS) is designed at the outset for rapid change in structure, as well as in hardware and software components, in order to quickly adjust production capacity and functionality within a part family in response to sudden changes in market or in regulatory requirements [1]. A reconfiguration is called a local reconfiguration, if it is applied for switching a machine of a REMS between its working mode and energy-efficient mode. TNCESs [34, 35] have a visual graph expression, a clear modular structure, and an exact mathematical definition inherited from Petri nets [36,37,38,39,40] They have a strong analysis software tool: SESA (http://homepages.engineering.auckland.ac.nz/vyatkin/ tools/modelchekers.html) [41]. The concurrence of reconfiguration functions and transitions is forbidden in a R-TNCES, which is inconsistent with system requirements of REMSs. As a result, formal verification of such complex systems cannot be performed.
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