A Simplified Throughput Model for a Unit-Load AS/RS Considering Dynamics Principles

This paper presents a unit-load automated storage and retrieval system’s (AS/RS) throughput analysis that uses an S/R machine for diagonal aisle transportation and a structure for both vertical and horizontal transportations. Although many methods are available to compute the AS/RS throughput rate, the method recommended by the Material Handling Institute (MHI) is more suitable for real or practical cases. This method assumes (i) randomized storage with constant vertical and horizontal speeds of the S/R machine, and (ii) simultaneous travel in both directions. We consider a new simplified and more efficient approach for MHI’s method to predict the throughput performance of the AS/RS.