Abstract
In this article, a framework is proposed for computerization of tool-replacement decision making in flexible manufacturing systems (FMSs). Specifically, a procedure is outlined that addresses the decision of whether a tool should or should not be replaced prior to its processing of a workpart. The proposed procedure attempts to minimize the tool-related economic losses associated with these decisions while maximizing part throughput. The limitations of both the human and the computer at achieving both of these system performance objectives are discussed and form the basis to the proposed procedure. Based on a simulation study examining human capabilities at making tool-replacement decisions, various heuristics employed by humans who were successful at performing this task were identified. These heuristics as well as other considerations were incorporated into the procedure in an effort to maintain a balance between the more direct local consequences and less direct global consequences of tool-replacement decisions on the economic and throughput objectives, respectively. The article concludes with a discussion on the role of sensitivity analysis, and the use of the procedure within the context of human supervisory control of FMSs.
