![]() ![]() A fuzzy classification algorithm was applied to determine the probability of job task occurrence, and then the existing job tasks and the job tasks that needed to be generated were considered to solve the dynamic multivehicle path optimisation problem using a genetic algorithm to assign shuttle delivery more rationally 12. In 11 the reference, shuttle scheduling theory was classified according to different scheduling situations and focused on multiple shuttle selections in cases of single task requests versus single shuttle selections in cases of multiple task requests. Scholars have mostly focused on AVS/RS and SBS/RS systems for storage systems, and less on four-way shuttle scheduling optimization 7, 8, 9, 10. Due to its high initial investment cost, it is mainly suitable for small load warehouses. This system is a new technology in AVS/RS and requires a shuttle car on each layer. The latter is a system in which the trolley is assigned to a specific layer of AVS/RS for operation and cannot move with the hoist.SBS/RS system is an automatic storage system with shuttle car as the core. The former is that the trolley can move up and down to different layers with the hoist. In the scientific literature, research on AVS/RS can be broadly divided into interchangeable and non-interchangeable systems. As a result, the number of aisles increases with the size of the warehouse, resulting in poor space utilization. AS/RS systems are relatively inexpensive to implement in real industrial production, but such systems are less flexible and AS/RS can only feed single- or double-depth racks. ![]() The most common types of automated stereo warehouses are AS/RS, SBS/RS, AVS/RS. The floor plan of the four-way shuttle system studied in this paper is shown in Fig. However, this storage layout stores small-lot, multivariety goods in a flexible access mode, and multiple four-way shuttles can be used to operate in parallel, improving the efficiency of access operations. Single-depth racking is suitable for storing small quantities and multiple varieties of small items, and this system requires more main tracks, which crowds the storage space and reduces the storage space utilisation. The four-way shuttle system studied in this paper is a single-depth racking configuration with a row of high-rise racks on each side of each aisle and a hoist at the end of the aisle to match the four-way shuttle's layer change operation. Planning a collision-free and conflict-free shortest optimal path for multiple four-way shuttles in a fixed warehouse scenario is a difficult problem in the study of four-way shuttle systems. However, with the expansion of inbound and outbound tasks and the increase in the number of available four-way shuttles, the complexity of task allocation and scheduling multivehicle parallel operations of four-way shuttles has increased. Not only can the trolley run in four directions in a single layer of shelves but it can also run with the hoist to complete a layer change, which is important for improving the stability of storage system operation, work efficiency, and reducing operation production costs. As an upgrade of the shuttle system, the four-way shuttle system has characteristics, such as longitudinal and transverse lanes between shelves and cross nodes between lanes. ![]()
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