通过对可编程逻辑控制器(Programma blelogic contro ller,PLC)的梯形图语言及指令表语言的分析,提出了基于AOV(Activity on vertex)有向图和二叉树实现梯形图与指令表程序相互转换的算法。转换算法将梯形图映射为AOV图,并由其建立二叉...通过对可编程逻辑控制器(Programma blelogic contro ller,PLC)的梯形图语言及指令表语言的分析,提出了基于AOV(Activity on vertex)有向图和二叉树实现梯形图与指令表程序相互转换的算法。转换算法将梯形图映射为AOV图,并由其建立二叉树来表示指令间的逻辑关系,通过遍历二叉树实现PLC梯形图与指令表的转换。文中给出一个转换实例,介绍了算法思想及其实现步骤。该算法具有通用性,适于复杂控制逻辑的梯形图,已成功用于水电自动化监控系统中的PLC编程软件平台。展开更多
A new method on the interval stability of networked control systems （NCSs） with random delay and data packet dropout is studied. Combining interval systems and NCSs, a graphic condition on judging interval stability...A new method on the interval stability of networked control systems （NCSs） with random delay and data packet dropout is studied. Combining interval systems and NCSs, a graphic condition on judging interval stability is presented in terms of the weighted diagraph theory in graph theory. Furthermore, utilizing the graph-theoretic algorithm, the delay-depended controller gains are obtained. Aiming at the same delay and data packed dropout, several controller gains are obtained, simultaneously. The example and simulation illustrate the effectiveness of the proposed method.展开更多
Bill of material (BOM) structures describe the component structure of a product.It is used and processed in the whole product lifecycle,and is the bridge for the product data integration among enterprise application.I...Bill of material (BOM) structures describe the component structure of a product.It is used and processed in the whole product lifecycle,and is the bridge for the product data integration among enterprise application.In the process of product development,product model is evolving and BOM is also changed.To keep the data among BOM views integrate,accurate and consistent,a general model of weighted diagraph of product BOM is developed.By establishing BOM structure model and defining the mapping rules of Virtual Component,Successive Component,Middle Component and Collaborative Component,an algorithm for BOM structure mapping is proposed based on single source of product data (SSPD).According to BOM multi-view mapping and SSPD,an integration model and application framework of the product design and the manufacturing process is given.Final- ly,a BOM management system named BomMan is provided,which indicates the validity and feasibility of this method.Thus, the reconfiguration from EBOM to MBOM could be realized.展开更多
文摘通过对可编程逻辑控制器(Programma blelogic contro ller,PLC)的梯形图语言及指令表语言的分析,提出了基于AOV(Activity on vertex)有向图和二叉树实现梯形图与指令表程序相互转换的算法。转换算法将梯形图映射为AOV图,并由其建立二叉树来表示指令间的逻辑关系,通过遍历二叉树实现PLC梯形图与指令表的转换。文中给出一个转换实例,介绍了算法思想及其实现步骤。该算法具有通用性,适于复杂控制逻辑的梯形图,已成功用于水电自动化监控系统中的PLC编程软件平台。
基金partially supported by the National Natural Science Foundation of China (60574011).
文摘A new method on the interval stability of networked control systems （NCSs） with random delay and data packet dropout is studied. Combining interval systems and NCSs, a graphic condition on judging interval stability is presented in terms of the weighted diagraph theory in graph theory. Furthermore, utilizing the graph-theoretic algorithm, the delay-depended controller gains are obtained. Aiming at the same delay and data packed dropout, several controller gains are obtained, simultaneously. The example and simulation illustrate the effectiveness of the proposed method.
文摘Bill of material (BOM) structures describe the component structure of a product.It is used and processed in the whole product lifecycle,and is the bridge for the product data integration among enterprise application.In the process of product development,product model is evolving and BOM is also changed.To keep the data among BOM views integrate,accurate and consistent,a general model of weighted diagraph of product BOM is developed.By establishing BOM structure model and defining the mapping rules of Virtual Component,Successive Component,Middle Component and Collaborative Component,an algorithm for BOM structure mapping is proposed based on single source of product data (SSPD).According to BOM multi-view mapping and SSPD,an integration model and application framework of the product design and the manufacturing process is given.Final- ly,a BOM management system named BomMan is provided,which indicates the validity and feasibility of this method.Thus, the reconfiguration from EBOM to MBOM could be realized.
