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Flexible manufacturing workstation control with error recovery capability: A hybrid approach.

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A multi-Petri net framework within a hierarchical structure is developed to provide a flexible and organized structure for modeling workstation operations. State equations for the hierarchical Petri nets are established to provide a mathematical description of workstation behavior. A Petri net-based monitoring approach is presented that provides adaptation to different evolutions of workstation operations and enables real-time fault detection. A hybrid approach which combines a Petri Net with a Neural Net based on the Petri net state equations and T-gate threshold logic is presented and is shown to facilitate obtaining state evolution information. Determination of preliminary actions for different fault situations occurring in a workstation is achieved through a Sequential Radial Basis Function Network (SRBFN) approach. The SRBFN consists of several subnets where each subnet is a radial basis function network and is used to identify one specific preliminary action. The proposed SRBFN has the advantages of being able to recognize novel faults and to re-train the network with minimal historical data. The generation of error recovery plan(s) is accomplished through the development of an intelligent task planning system based on a Petri net process steps representation and a special Boltzmann Machines learning mechanism. The intelligent task planning system quantifies the relationships among different process steps and generates possible recovery plans according to the probabilities of achieving specified recovery strategies.

Full Title
Flexible manufacturing workstation control with error recovery capability: A hybrid approach.
Date Issued
2001
Language
English
Type
Department name
Industrial Engineering
Media type
Subject (LCSH)
Ma, . Y.-H. (Christina). (2001). Flexible manufacturing workstation control with error recovery capability: A hybrid approach. (1–). https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/flexible-0
Ma, Yi-Hui (Christina). 2001. “Flexible Manufacturing Workstation Control With Error Recovery Capability: A Hybrid Approach”. https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/flexible-0.
Ma, Yi-Hui (Christina). Flexible Manufacturing Workstation Control With Error Recovery Capability: A Hybrid Approach. 2001, https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/flexible-0.