Selective Asynchronous Parallel Disassembly Sequence Planning Considering Indeterminate Degree of Disassembly

In view of the facts that the selective disassembly planning method commonly used in the recycling of waste products which might not fully considered the regeneration benefits of all parts, a method of selective asynchronous parallel disassembly sequence planning with an indeterminate degree of disassembly was proposed. The connection relation and priority constraint relation among product parts were expressed by the disassembly hybrid diagram. Based on this, the minimum required set of parts to be searched in the reverse direction was taken as the lower limit of the disassembly set to obtain the set with different disassembly degrees. Then a mathematical model was established with the optimization goals of minimum disassembly time and maximum disassembly profit, and an improved biogeographic-based optimization algorithm was proposed for solution optimization. Combined with the characteristics of the disassembly sequence planning problem, a coding method was designed based on three-layer linked list, and a random topology structure was used to improve the global search ability and local search ability of the algorithm. Finally, a mechanical arm and a two-stage cylindrical bevel gear reducer were studied as instances to demonstrate the feasibly and efficiency of the method presented. © 2021, China Mechanical Engineering Magazine Office. All right reserved.