Designing the optimal multi-deep AS/RS storage rack under full turnover-based storage policy based on non-approximate speed model of S/R machine

The design of an optimal rack for 3D multi-deep AS/RS under full turnover-based storage policy is explored in this paper. The acceleration and deceleration characteristics of storage and retrieval (S/R) machine are considered based on non-approximate speed model of S/R machine. We divided three typical scenarios to investigate. With regards to each scenario, we derive the expected retrieval time for single-command cycles adopting exact speed model and develop the model for optimally designing 3D multi-deep AS/RS rack. From the model, we can derive the optimal rack dimensions for various scenarios more precisely. Our findings are demonstrated by a practical example.