Application of Multi-objective Optimization of Multi-material-multi-part Specification Composite Construction

A multi-objective optimization method is proposed,which includes the composite structure of material type,parts specifications and parts thickness of the part system and takes minimization of weight and cost as objective.A mathematical model of multi-objective optimization of such a multi-material-multi-part specification composite structure is also proposed.In the mathematical model,the material type,rather than a number of material properties,parts specifications,rather than part geometry and price properties,are defined as discrete variables,thus greatly reducing the complexity of optimization problems.Then the optimal Latin squares design of experimental method and least-squares response surface method are adopted to construct the objectives and constraints.The approximate model is optimized by using NSGA-II.The proposed method is illustrated through a case of lightweight design of a steering wheel,and a steering wheel compression test rig is built to verify the optimization result,which proves the feasibility of this method.