Modelling of automated guided vehicle system with relative threshold values in just-in-time environment

• Main Authors: Chu,Jiun-Jye, 車俊傑
• Other Authors: Yang Feng-Cheng
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/17755882189931359827

碩士 === 國立臺灣大學 === 工業工程研究所 === 84 === In Just-in-time (JIT) production system, labor or forklifts are widely used for material handling. In addition, kanban system are implemented to obtain production efficiency of pull strategy and to maintain low level of inventory. To replace forklift with Automated Guide Vehicle System (AGVS), information transfer of kanban systems should be changed for automatic material handling equipments. This thesis presents AGVS implementation procedures for JIT systems. The introduced AGVS is dispatched by input and output thresholds imposed on the input and output queues of work stations. Threshold values are computed based on process time. The physical states of queues are detected by sensing devices and compared with thresholds to dispatch vehicles. Methematical model is used to ca;culate required number of vehicles. Three guided-path models of AGVS are introduced: chessboard unidirectional, tandem bi- directional, and cyclic bi-directional guided-path models. Simulation models are setablished to updated by analyzing the simulation results. Moreover, based on the performance evaluation, the best guided -path model should be adopted for actual system implementation. The throughput and average process inventory.