Research on optimization design method of customized product based on RIR-MOO

Mass customization is the development direction of future product manufacturing. Quickly responding to customers' individual needs at low cost is the key to customized products design. Previous researches on customized product design lacked a flow-oriented design guidance method from individualized needs to product parameter, which led to the inability to quickly associate design targets and guided the design of product parameters from the individualized customer needs of customized products. For this reason, a optimization design method of customized product based on the RIR-MOO (relative importance ratings and multi-objective optimization) was proposed. Based on the customer needs, the key needs were mapped to the related design targets，and the product parameters were quickly calculated through the multi-objective optimization (MOO) method to realize the fast response and optimized design of customized products. Firstly, aiming at the fuzzy and dynamic customer needs, the weighted interval rough set analysis method was used to objectively analyze the customer needs of customized products to eliminate the controversial fuzzy needs, and the relative weights of different customer needs were calculated to obtain the relative importance ratings (RIR). Then, a correlation method between customer needs and design targets was proposed based on the conversion matrix. According to the correlation between key needs and design targets and the RIR of the key needs, the key needs were matched with the design targets to achieve the conversion of the key needs into the design targets. Lastly, the product parameters corresponding to design targets were optimized based on the MOO method to achieve the multi-objective optimization of the customized product. The feasibility of the optimization design method based on the RIR-MOO was verified by an optimization design example of the automobile engine piston mechanism. The results show that the proposed method can quickly respond to customer needs of customized products and guide their optimization design, which can provide guidance for customized manufacturing enterprises.