Document Type

Research Paper

Publication Date



Double deep storage is an efficient method to improve space utilization in warehouses. Contrary to intuition, it also can be efficient when considering retrieval times, since the aisles of a warehouse with double deep storage may be shorter than comparable warehouses with single deep storage. AS/RS-machines equipped with two load-handling units might further improve the situation, since two storage units (for instance pallets or cases) can be stored and retrieved, effectively allowing quadruple command cycles, bringing in total two storage units into the aisle and retrieving two storage units at the same time. In this paper, we present a method for the computation of cycle times and average cycle times with the assumption of equally distributed access probabilities for AS/RS-machines equipped with two load handling devices


Paper 9

Publication Title

Progress in Material Handling Research: 2016