物件導向裴氏圖現場控制系統發展方法

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题名:	物件導向裴氏圖現場控制系統發展方法
其它题名:	An Object-oriented Petri Net Approach for Developing Shop Floor Control System
作者:	黃炯彰 Huang, Jeong-Chang
贡献者:	王立志 Wang, Li-Chih 東海大學工業工程與經營資訊學系
关键词:	現場控制系統;裴氏圖;物件導向;系統模擬 Shop Floor Control System;Petri Nets;Object-oriented;Simulation
日期:	1995
上传时间:	2011-05-25T08:35:21Z (UTC)
摘要:	隨著電腦資訊科技的進步，製造系統已經大量運用電腦技術進行生產控制，使得製造系統的加工能力與彈性度提高；也由於為獲得較高的設備使用率，增加同步活動與資源共用的情形，造成系統行為的複雜化，控制系統的建構更為不易。本研究提出一整合性的現場控制系統發展方法，此方法可分成四個階段：(一)系統需求分析，確認系統需求與控制系統的規格。(二)系統行為分析，藉由物件導向裴氏圖(Object-oriented Petri Net; OPN)動態呈現控制系統的行為模式，並進行系統的行為分析，以確保控制系統的可行性。(三)系統設計，配合相關的控制策略，進行控制系統的行為模擬與績效評估，決定可行的控制策略。(四)系統實施，配合可行的控制策略，藉由轉換規則，迅速獲得控制程式碼，以完成控制系統的建構。本研究提出的整合性系統發展方法，具有物件導向高模組化、彈性與容易維護更新的特點，以及裴氏圖的圖形表達與數學分析能力。此外，採用模擬方式測試不同控制策略的績效，以獲得較佳的控制績效。並且使用法則式(rule-based)的現場控制軟體發展工具(FASTech CELLworks)，根據控制系統的物件導向裴氏圖模式，經由轉換獲得控制程式，可以加速控制系統的發展。 Computer information technology not only greatly enhances both the machining capability and the flexibility of a manufacturing system, but also increases the complexity of system behavior (e. g., concurrent activities, resource sharing), so that the development of a suitable control system becomes to be very difficult. The objective of this research is to develop an integrated system development method which may be divided into four phases: (1) system requirement analysis - the identification of both the system requirements and the specifications of the control system, (2) system behavior analysis - an object-oriented Petri net (OPN) model is developed to represent and analyze the dynamic behavior of the desired control system, (3) system design - the most suitable control strategy used in the control system is determined by using the OPN simulator which will test a variety of available control strategies, (4) system implementation - the computer code of the control system may be immediately obtained by following a number of transformation rules. The integrated system development method proposed in this research not only possesses the characteristics of object-oriented method (e.g., the higher degree of modularity, flexibility and maintainability) and Petri nets (e.g., graphical representation and mathematical analysis capabilities). Furthermore, the most suitable control strategy of the control system is obtained by simulation , and the use of a rule-based shop floor control enabling software(i.e., FASTech CELLWorks) in developing the shop floor control system will greatly reduce the effort in developing a control software since the code may be immediately transformed from its corresponding OPN model.
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