Efficient Assessment of State Liveness in Open, Irreversible, Dynamically Routed, Zone-Controlled Guidepath-based Transport Systems: The General Case

Abstract

Open, irreversible, dynamically routed, zone-controlled guidepath-based transport systems model the operation of many automated unit-load material handling systems that are used in various production and distribution facilities. An important requirement for these systems is to preserve the system liveness – i.e., the ability of each system agent to reach any location of the underlying guidepath network – by blocking those traffic states that will result in deadlock and/or livelock. The remaining set of traffic states are characterized as “live”. The worst-case computational complexity of the decision problem of assessing the state liveness in the considered class of transport systems is an open issue. This work capitalizes upon some recent developments on the problem of assessing state liveness in the considered transport systems in order to provide a novel algorithm for this problem. The worst-case computational complexity of this algorithm is not polynomially bounded with respect to the size of the underlying transport system, but the empirical complexity of the algorithm is expected to be very benign for the reasons that are explained in the paper.

Projects

Verification and Control of Networked Discrete Event Systems

Tomáš Masopust, Jan Komenda
Jiří Balun, Stéphane Lafortune, Spyros Reveliotis, Feng Lin

Authors

Spyros Reveliotis
Tomáš Masopust

Workshop on Discrete Event Systems (WODES), IFAC-PapersOnLine 53(4), 2020
Discrete-Event Systems and Theoretical Computer Science Research Group
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