Structured intelligence for self-organizing manufacturing systems

被引:11
作者
Kubota, N
Fukuda, T
机构
[1] Osaka Inst Technol, Dept Mech Engn, Osaka 535, Japan
[2] Nagoya Univ, Dept Micro Syst Engn, Chikusa Ku, Nagoya, Aichi 46401, Japan
关键词
intelligent manufacturing system; self-organization; genetic algorithm; fuzzy theory; scheduling problem;
D O I
10.1023/A:1008916402223
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
This paper deals with fuzzy scheduling and path planning problems by genetic algorithms. We have proposed a self-organizing manufacturing system (SOMS) that is composed of a number of autonomous modules. Each module decides output through interaction with other modules, but the module does not share complete information concerning other modules in the SOMS. Therefore, we require structured intelligence as a whole system. In this paper, we consider a manufacturing line composed of machining centres and conveyor units. The manufacturing procedure can be divided into a sequence of three modules: (a) tool locating module, (b) scheduling module, and (c) path planning module. The tool locating problems have been already solved. In this paper, we first solve the scheduling problem as global preplanning. Here we assume that the processing time is not constant, because some delay may occur in the machining centres. We therefore apply fuzzy theory to represent incomplete information about the machining time. We solve the fuzzy scheduling problem with a genetic algorithm. After global preplanning, the path planning module transports materials and products. Next, the scheduling module acquires the actual processing time of each machining centre. Based on the processing time, the schedule module generates a fuzzy number for the processing time. We discuss the effectiveness of the proposed method through the computer simulation results.
引用
收藏
页码:121 / 133
页数:13
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