![]() ![]() Moreover, since an operator performs the picking tasks on the forklift, there is no need for any additional equipment or operator. The order picker forklifts with their maneuverability in very narrow aisles and high level picking capabilities enable the warehousing systems to utilize the limited storage space more efficiently. The order picker forklifts are used in picker-to-part material handling systems and in applications where pallet trucks, rolling ladders, and other piece-picking methods were traditionally used. In nowadays technology of material handling systems, picking the orders or materials in some warehouses are done by high-tech order picker forklifts. Warehousing, as an important segment of logistics, incorporates several technology-driven operations such as material handling and packaging. Moreover, it is observed that significant energy savings can be achieved by solving the EMFRP instead of the classical distance minimization problem. Computational results show that the proposed heuristic approach finds high quality solutions. To solve larger instances, we provide tour construction and tour improvement heuristics and integrate them into a single solution approach. A mixed integer programming formulation and a dynamic programming approach are developed to solve small size instances of the EMFRP exactly. We calculate the forklift’s energy consumption in both horizontal and vertical moves considering the effects of friction forces, the acceleration and deceleration of the forklift, and its load. To our knowledge, this is the first study that considers the order picker forklifts in the context of the order picking problem. ![]() In this paper, we introduce and study the energy minimizing order picker forklift routing problem (EMFRP) which aims to find an energy-efficient route for an order picker forklift to pick a given list of items. Therefore, finding an energy-efficient route for an order picker forklift can yield significant savings in the energy consumption in warehouses and the resulting CO 2 emission. Routing the order picker forklifts to pick ordered items belongs to the operational decision level and is done in high frequency. These order picker forklifts provide efficient utilization of the storage space by their ability in moving in narrow aisles and picking items from high level racks. The material handling systems used in warehouses involve important operations such as the usage of order picker forklifts. ![]()
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