Storage System Layout
A warehouse consists of a number of parallel aisles. The items are stored on both sides of the aisles. Order pickers are assumed to be able to traverse the aisles in both directions and to change direction within the aisles. Their major roles include: buf
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Storage System Layout Javad Behnamian and Babak Eghtedari
A warehouse consists of a number of parallel aisles. The items are stored on both sides of the aisles. Order pickers are assumed to be able to traverse the aisles in both directions and to change direction within the aisles. Their major roles include: buffering the material flow along the supply chain to accommodate variability caused by factors such as product seasonality and/or batching in production and transportation; consolidation of products from various suppliers for combined delivery to customers; and value-added-processing such as kitting, pricing, labeling, and product customization. Usually the items in a warehouse exhibit varying characteristics with respect to dimensions, weight, demand, and other properties. It is natural to apply certain storage and retrieval strategies depending upon the product families or individual products within families. Products need to be put into storage locations before they can be picked to fulfill customer orders. A storage policy is considered optimal if it minimizes the average time required to store and retrieve a unit load while satisfying the various constraints placed upon the system. A storage assignment policy is a set of rules which determines where the unit loads of different products will be located in a warehouse. With regard to storing unit loads, two major classes of storage policies can be distinguished (Koster et al. 2007; Goetschalckx and Ratliff 1990; Van den Berg et al. 1999) in other word, The storage location assignment problem (SLAP) is to assign incoming products to storage locations in storage departments/zones in order to reduce material handling cost and improve space utilization. Different warehouse departments might use different SLAP policies depending on the department-specific SKU profiles and storage technology (Gu 2005). A basic rule in assigning products to storage locations is storing “better” products in the “better” locations in the order picking system. A “the most desirable locations” is a location, which provides faster and more ergonomic access to the product stored. The definition of “the most desirable locations” depends on the system as well as the travel pattern. For example, if traversal routing policy is used for traveling in a conventional multi-parallel-aisle system, the desirability of locations are measured in terms of aisles where the most desirable locations are in the aisle that is closest to the I/O point (This leads to the so-called organ pipe storage location assignment) (Gu et al. 2007). R.Z. Farahani and M. Hekmatfar (eds.), Facility Location: Concepts, Models, Algorithms and Case Studies, Contributions to Management Science, c Physica-Verlag Heidelberg 2009 DOI 10.1007/978-3-7908-2151-2 18,
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J. Behnamian and B. Eghtedari
A measure of “goodness” of an item could have been the frequency with which it is requested. If an item is requested frequently, it is logical to keep that item in an easily accessible location. But if the item is too heavy
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