2023-12-02T05:13:53Z
https://iwate-u.repo.nii.ac.jp/oai
oai:iwate-u.repo.nii.ac.jp:00009833
2023-05-15T12:35:21Z
1515:1519
閉ループ形生産システムにおけるパレット投入制御
井山, 俊郎
水野, 雅裕
田牧, 純一
佐藤, 英輔
Production Sysytem
Process Planning
Production Planning
Closed Loop System
Pallet
Input Control
Policy
Production Rate
Inventory
Markov Decision Process
The number of pallets circulating in a closed loop production system is an important factor which affects the production rate. If the number is large, pallets stagnate in the system. If the number is small, an idling state occurs frequently in many stages. In both cases the production rate drops. Therefore, it is necessary to control the number of in-process pallets in the system according to the states of pallet flow and stages in order to maximize the production rate. In this paper, we study the effect of pallet input control for a closed loop production system with constant operation cycle time and stage breakdown. First, we model a pallet flow in the system by a Markov model, and analyze the maximum production rate yielded in the system and the optimum policy for pallet input control by a Markov decision process. Next, we present the effectiveness of pallet input control comparing with the uncontrolled system. Finally, in order to investigate the effect of the number of pallets on the production rate, we analyze the production rate and the number of in-process pallets under the optimum policy using the reward function which consists of the production rate and the number of in-process pallets. The main results are as follows. (1) There is the optimum policy for pallet input control which yields the maximum production rate. (2) The pallet control is effective to increase the production rate and decrease the number of in-process pallets. (3) The decrease of the number of pallets monotonously reduces the production rate. However, if the buffer capacity is large, the reduction is very small near the maximum production rate.
journal article
社団法人日本機械学会
2001-01-01
VoR
日本機械学會論文集. C編
655
67
866
872
0387-5024
jpn
http://ci.nii.ac.jp/naid/110002386085
社団法人日本機械学会
本文データは学協会の許諾に基づきCiNiiから複製したものである