Abstract
This paper focuses on the problem of deadlocks in automated flexible manufacturing systems (FMS) where deadlocks are caused by unmarked siphons in their Petri net models. A deadlock prevention policy is proposed for a subclass of Petri nets, S3PMR that can well model a large class of FMS. We distinguish siphons in such a net model by elementary and dependent ones. For each elementary siphon, a monitor is added to the plant model such that it is invariant-controlled. The monitor addition way guarantees that no emptiable control-induced siphon in the resultant net is generated due to the addition of monitors. This novel deadlock prevention policy can usually lead to a more permissive supervisor by adding a relatively much smaller number of monitors and arcs than the existing methods for the design of liveness-enforcing Petri net supervisors. Experimental study validates the result.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.