Abstract
Automated storage and retrieval systems (AS/RS) play a key role in improving the performance of automated manufacturing systems, warehouses, and distribution centers. In the modern manufacturing industry, the term (AS/RS) refers to various methods under computer control for storing and retrieving loads automatically from defined storage locations. Using an (AS/RS) is not considered a value-added activity. Therefore, the longer (AS/RS) travels, the more expensive the warehousing process becomes. This paper presents an algorithm for minimizing total travel distance/time between input/output (I/O) stations. The proposed algorithm is used to manage the storage and retrieval orders on warehouse shelves in class-based storage on the storage racks. It contains two steps: the first step is to evacuate some storage compartments (locations) near the I/O station; in the second step, some tote bins are reallocated to compartments closer to the I/O station. Among the features of this algorithm are mechanisms that determine the number of reallocated tote bins, which tote bins to reallocate, and in which direction (toward the I/O station or away from it). A simulation model using R software developed specifically for this purpose was used to validate the suggested method. Based on the results, the new method can reduce the service time per order by about 10% to 20%, depending on parameters like the number of orders and the height of the storage rack.
Highlights
Material handling is the activity of moving, storing, protecting, and controlling materials inside a facility and is more popularly known as internal logistics [1]
We examined how the AS/RS system can save service times during the working shift when preparation occurs during idle time
Even with small margins of savings in service time, the utilization will be lower; savings in orders waiting time is expected to be more than the time of the preparation process
Summary
Material handling is the activity of moving, storing, protecting, and controlling materials inside a facility and is more popularly known as internal logistics [1]. The storage policy of assigning arriving unit loads randomly to open storage locations in a warehouse is called randomly assigned storage (RAN) [6]. [8] defines the dwell-point as the point where the stacker crane will stay when idle (i.e., no storage or retrieval orders to perform). The warehouse management system manages the orders of upcoming transactions as well as provides data about the confirmed and the expected storage and retrieval orders. The upcoming storage and/or retrieval requests can be managed and classified according to the stacker crane’s operating mode. During the entire dual command cycle, storage and retrieval are performed following each other in one route to reduce the distance traveled and, reduce the transaction time. The single command cycle concerns only one transaction per route, either storage or retrieval.
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