Earch And Multi-objective Optimization Of Buffer Energy Absorption Characteristics Of The Thin-walled Tapered Member

During the thorough test,the test circuit module often fails to work properly due to the shock acceleration exceeding its own limit.To solve this problem,ANSYS / LS-DYNA finite element software was used to optimized the design of the thin-walled cone member and the thin-walled square cone member,and the multi-objective optimization of the designed buffer member was performed based on response surface method.(1)The ANSYS / LS-DYNA software was used to simulate the thin-walled conical members with different base angles and the thin-walled cylindrical members of the same size under the action of half-sine acceleration shock.By comparing the numerical simulation of the thin-walled conical member and the thin-walled cylindrical member,it is concluded that the thin-walled conical member has higher impact isolation efficiency and better energy absorption effect than the thin-walled cylindrical member.It is concluded that the thin-walled conical member has better buffering energy absorption characteristics than the thin-walled cylindrical member and is a better buffering member.By comparing the numerical simulation of thinwalled cone members with different bottom angles,it is concluded that as the bottom angle decreases from 90° to 65°,the impact isolation efficiency and specific energy absorption of thin-walled cone members have more than doubled.It is concluded that the energy absorption characteristics of the thin-walled cone member increase with the decrease of the bottom angle.(2)Based on the response surface method,the approximate function of the optimization target was constructed.First,a full factor test design method was used to select a sample interval of 36 samples at a 2-factor and 6 level.The 36 sample points were respectively numerically simulated,and the obtained simulation results were used to fit the response surface approximation functions of three optimization targets: the response acceleration of the test circuit module,the total energy absorption and the mass specific energy absorption.And the significance evaluation and error analysis of the constructed response surface model are carried out.It is concluded that the response surface model is highly significant,and the approximate response surface model can accurately reflect the results of numerical simulation.Considering the three optimization objectives comprehensively,the optimal design parameters of the thinwalled conical members and thin-walled square cone members were finally selected as the wall thickness 0.7mm and the base angle 65 °.(3)By comparing and analyzing the three indexes of the response acceleration peak of the test circuit module,the total energy absorption and the mass specific energy absorption of the thin-walled cone member,the buffering energy absorption characteristics of the thin-walled cone member and the thin-walled square cone member are analyzed.Through research,it is found that combining explicit finite element analysis technology with response surface method can not only obtain accurate approximate results,but also use the obtained approximate functions to quickly calculate the optimal design parameters.At the same time,it also provides a certain degree of reference value for the application of thin-walled tapered members in the test device.