順列循環型搬送システムの運用効率向上策について(機械要素,潤滑,工作,生産管理など)

概要

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This paper discusses a material handling system which we call permutation circulation-type vehicle routing system (denoted PCVRS). The PCVRS consists of a guide path of single loop-type (called the loop), multiple vehicles and multiple stages. Each vehicle unidirectionally and repeatedly circulates on the loop without passing, and processes a job on stages located along the loop. Increasing the number of vehicle for getting higher throughput (i.e., the number of jobs processed per hour), interferences between vehicles occur, which increase travel time of vehicles, resulting in deterioration of system performances. This paper discusses two types of interferences, which may occur when jobs have different processing times, and considers the modification of operation policy consisting of routing and scheduling to decrease the interferences. This paper proposes an operation policy called "order-SPT", and discusses its performances such as mean travel time, throughput and queue length by means of simulation experience, validates superiority of the order-SPT operation policy.
2002-09-25