Abstract
In automated manufacturing systems, resource failures are often inevitable. They reduce the number of available resources and may cause some processing routes of parts to halt and sometimes the who...
Highlights
Automated manufacturing systems (AMS) are modern production facilities which are highly adaptable to variable production plans and goals
This article has focused on the robust deadlock prevention problems in AMS with single type of unreliable resources
For AMS that can be modeled by S3PR with a single type of unreliable resources, the conception of blocked states (BSs) is presented
Summary
Automated manufacturing systems (AMS) are modern production facilities which are highly adaptable to variable production plans and goals. In Definition 8, condition (1) indicates that at any BS, at least one unit of unreliable resources has failed and condition (2) shows that the S3PR part of the US3PR has trapped into deadlock states because of resource failures, that is, unless at least one failed resources is repaired, the production on some processing route pauses. We first develop robust controllers for an US3PRs without k-resources and for general US3PRs. For u[S] = [S] [ (H(ru) \S), let v(S) = {p | p2P, p Nu[S]} be the set of operation places which are previous to u[S], and t is called an input of v(S) if its firing increases the number of tokens in v(S) and an output one if its firing decreases the number of tokens in v(S).
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