GEMS Model of an AS/RS Automated Warehousing/Distribution Center. Definition, Development and Implementation of a Generalized Manufacturing Simulator, GEMS

摘要

Use of a Generalized Manufacturing Simulator (GEMS) in various stages of an AS/RS warehouse system design is described. GEMS models were developed as a verification tool to study systems behavior under different input/output parameters and to verify system specifications. The schematic layout of a fifteen aisle warehousing system used in this study contains three interrelated operational subsystems for input, storage-retrieval, and output. A preliminary design network model, GEMS Model 1, for use in validation/verification is described together with the assumptions on which it is based. Parallel information is presented for GEMS Model 2 which is similar to GEMS Model 1 except for modifications to incorporate use of forklift trucks and identify products stored in each aisle. Results indicate that a designer using GEMS Model 2 can verify or attempt to optimize operational parameters. Experimental results with Model 2 illustrate the pitfalls of designing for the average. The final GEMS Model 2 system design meets system specifications for the average output rate, but it cannot cope with sustained peak output rates. Extensive diagrams and data are included.