Abstract

A general model of concurrent, asynchronous process flow in flexible assembly systems (FASs) is considered. It allows all feasible (with respect to the physical constraints of the system operation) process realizations, hence also the realizations leading to a deadlock. The main investigations are focused on the problems of process realizability, i.e. existence of a deadlock-free process realization, and (for cases where such realizations exist) of the least-restrictive deadlock avoidance policy. The problems addressed at process realizability testing and deadlock avoidance policy are proved to be NP-hard, hence practically intractable. Thus, a pragmatic, more restrictive but practically applicable, solution for handling the deadlock problems in FAS is also discussed.

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