Why a single aisle miniload system is not simple to model

In order to test the performance of various storage assignment policies of a miniload warehouse system a general simulation model was developed. Even though the system concept was relatively simple, the simulation model became quite complex. This is because there are numerous factors in the design and operation of even a simple, single aisle system which influence performance. This inherent complexity has contributed to the difficulty in anticipating the performance of large, automated warehouses. A set of assumptions is given which can realistically be expected to simplify a simulation model. Some of the factors which make a general simulation of this model difficult to construct are then considered. Simulation input parameters and output statistics are used to illustrate the generality of the model developed.