关键词: 双深度多层穿梭车仓储系统, 并行作业, 排队网络模型, Coxian分布

Abstract: The double-deep multi-tier shuttle warehousing system has problems such as long response time and low operation efficiency under the traditional sequential operation.To solve these problems,based on analyzing the parallel operation of lift and shuttle,the fork-join queueing network model of the storage system was proposed,and the approximate decomposition algorithm based on Coxian distribution was designed to evaluate the performance of the parallel operation.A closed queueing network model of fork-join point was constructed,and the general distributions of each service points were replaced by Coxian distribution to solve the throughput rate of the fork-join point.The fork-join point was replaced by single service point,and the open queuing network model based on the fork-join point was obtained.The maximum entropy method was applied for the analysis of the open queuing network model.Four configurations of the actual case were analyzed and verified,and the results showed that the proposed model could greatly improve the performance and operation efficiency of the double-deep multi-tier shuttle warehousing system.

Key words: double-deep multi-tier shuttle warehousing system, parallel operation, queueing network model, Coxian distribution