Zhiwu Li's Books

Optimal Supervisory Control of Automated Manufacturing Systems

By: Yufeng Chen,Zhiwu Li

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Optimal Supervisory Control of Automated Manufacturing Systems

By: Yufeng Chen,Zhiwu Li

This monograph presents the state-of-the-art developments in the design of behaviorally and structurally optimal livenessen-forcing Petri net supervisors with computationally tractable approaches. It details optimal supervisory control problems arising in automated production systems and outlines a methodology to achieve the optimality purposes of

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Page Count

204

Publisher

CRC Press

Published Date

ISBN 10

1466577541

ISBN 13

9781466577541

Scheduling and Reconfiguration of Real-Time Systems

A Supervisory Control Approach

By: Xi Wang,ZhiWu Li

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Scheduling and Reconfiguration of Real-Time Systems

A Supervisory Control Approach

By: Xi Wang,ZhiWu Li

This book presents a methodology for the real-time scheduling problems of real-time systems (RTS) from the viewpoint of control theory. Generally, any system can be viewed as an RTS if it performs real-time application functions and behaves correctly depending on given logical activities and satisfying specified deadlines for the activities. This monograph provides broad views and detailed introductions to supervisory control theory (SCT) and its application in real-time scheduling and reconfiguration. Based on three popular SCT modelling frameworks, discrete-event system (DES), timed DES (TDES), and state-tree structures (STS), the authors provide RTS modelling frameworks; thereafter, SCT is used to find their safe execution sequences. As the main contribution, we use (untimed) DES events to represent the execution and preemption of each individual RTS task. This modelling formalism brings the possibilities to model the preemptions of tasks’ executions. Furthermore, in some cases, priorities cannot be assigned to real-time tasks. In order to solve this problem, a matrix-based priority-free conditional-preemption (PFCP) relation is provided, which generalizes fixed-priority (FP) RTS scheduling. As a natural extension, a generalized modular modelling framework is presented to model the task parameters instead of the global real-time task. The modular models are taken to be generic entities, which also considers the exact execution time of real-time tasks. STS are undoubtedly recognized as a computationally efficient SCT framework which manages the state explosion problem significantly. Hence, building on the (untimed) modular RTS models, a novel STS-based RTS modeling framework is formulated, by assigning dynamic priorities as specified optimality criteria, which can be utilized to model sporadic RTS processing both sporadic and (multi-period) periodic tasks, providing a small set of the safe execution sequences which rank at the top.

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Page Count

218

Publisher

Springer Nature

Published Date

ISBN 10

3031419693

ISBN 13

9783031419690

Deadlock Resolution in Automated Manufacturing Systems

A Novel Petri Net Approach

By: ZhiWu Li,MengChu Zhou

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Deadlock Resolution in Automated Manufacturing Systems

A Novel Petri Net Approach

By: ZhiWu Li,MengChu Zhou

Deadlock problems in flexible manufacturing systems (FMS) have received more and more attention in the last two decades. Petri nets are one of the more promising mathematical tools for tackling deadlocks in various resource allocation systems. In a system modeled with Petri nets, siphons are tied to the occurrence of deadlock states as a structural object. The book systematically introduces the novel theory of siphons, traps, and elementary siphons of Petri nets as well as the deadlock control strategies for FMS developed from it. Deadlock prevention methods are examined comparatively. The many FMS examples presented to demonstrate the concepts and results of this book range from the simple to the complex. Importantly, to inspire and motive the reader’s interest in further research, a number of interesting and open problems in this area are proposed at the end of each chapter.

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Page Count

250

Publisher

Springer Science & Business Media

Published Date

ISBN 10

184882243X

ISBN 13

9781848822436

Nature-Inspired Structured Functional Surfaces

Design, Fabrication, Characterization, and Applications

By: Zhiwu Han

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Nature-Inspired Structured Functional Surfaces

Design, Fabrication, Characterization, and Applications

By: Zhiwu Han

Gives a comprehensive description on the biological model, basic physical models, fabrication/characterization of bioinspired materials and their functions.

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