PERFORMANCE ANALYSIS OF MINILOAD SYSTEMS.

Abstract

A miniload is an automated storage and retrieval system which stores small parts in bins or totes. The system consists of racks with a central aisle along with a computer-controlled stacker crane travels to store and retrieve the bins. These systems are typically used in order-picking applications, or in manufacturing support for the storage of tools and small parts. A simulation model of a single aisle, single pickup and delivery location miniload system is described. The model can be used to predict system parameters such as dual cycles per hour, crane and operator utilization and distance traveled by the crane. The model can be used to help design a miniload system that is capable of meeting or exceeding a given number of dual cycles per hour. This can be done by varying the height and length of the aisle, crane speeds, and/or storage policies. Examples demonstrate this design capability. The simulation model is written in Siman (C. D. Pegden, 1985) and the data support programs in Fortran. All elements of the model run on an IBM PC.