| The energy absorbing box is the main energy absorbing part of automobile bumper system,which can absorb the huge impact energy generated by collision through its own plastic deformation,so as to protect the safety of people and goods in the car.Therefore,carrying out the innovative design and optimization research of the energy absorbing box has important practical application significance for the improvement of vehicle safety performance.In this paper,the origami structure is introduced into the structure design of energy absorbing box,a novel creased energy absorbing box is proposed,and its structure is optimized.T he details are as follows:1.A novel creased energy absorbing box is designed and its parametric modeling is carried out.Firstly,a novel energy absorbing box is proposed by introducing creases onto the thin-walled tube.Then,the geometric parameters of the energy absorbing box are analyzed,and the independent parameters of the energy absorbing box and the relationship between the parameters are obtained.Secondly,the axial compression simulation model of the energy absorbing box is established by APDL,and the LS-DYNA is used to solve the model.The collision performance of the initial creased energy absorbing box and the traditional square energy absorbing box is compared,and the energy absorbing characteristics of the novel creased energy absorbing box are obtained.Finally,the influence of the structural parameters of the creased energy absorbing box on its energy absorption performance is analyzed by the sensitivity analysis method,which lays the foundation for the approximate model establishment and optimization design.2.The multi-objective structure optimization design of the creased energy absorbing box is carried out.Firstly,the design variables,optimization objectives and constraints of the multi-objective optimization design problem for the creased energy absorbing box are determined.Then,by using the optimal Latin hypercube design method and radial basis function,the surrogate model between the performance indexes and design variables of the creased energy absorbing box is established.Secondly,the micro multi-objective genetic algorithm is used to solve the optimization problem,and the local encryption method is used to improve the accuracy of the proxy model to ensure the accuracy of the results.Finally,the effectiveness of the optimization design is proved by the optimization results.3.The reliability optimization design of the energy absorbing box with multiple targets is carried out.Firstly,the design variables,interval variables,random variables,optimization objectives and reliability constraints of the multi-objective optimization problem of the energy absorbing box with crease type are determined.Then,the reliability optimization of energy absorbing box based on probability interval hybrid model is solved by using the micro multi-objective genetic algorithm.Finally,the effectiveness of the optimization design is proved by the reliability optimization results. |
