Inverse Determination Of Rubber Hyperelastic Material Parameters And Structural Optimization Of Rubber Suspension

With the prompt progress of auto industry,the suspension system,which a ffects the operation stability and safety reliability of automobile,is becoming increasingly important.In order to obtain ideal damping effect,new suspension systems have been developed and applied to automobile.Among them,the rubber suspension has drawn more and more attention due to its light weight and excellent performance.Based on the cooperation project of school and enterprise,this paper studies a kind of rubber suspension used in an automobile crane,the research mainly includes the inverse determination of the parameters of the rubber hyperelastic material,the finite element analysis and structural optimization of the balanced beam assembly for the rubber suspension.The details are as follows:Firstly,this paper introduces the hyperelastic constitutive theory of rubber materials,and focuses on several hyperelastic constitutive models appli ed to finite element analysis software.However,the traditional method to get hyperelastic material is relatively cumbersome,which brings great inconvenience to the analysis of rubber structure.In this case,according to the static stiffness test,the inverse model of rubber material parameters is bulit by jioning the algorithm with the simulated analysis.In this process,the finite element simulation model of the rubber spring,the Matlab-Abaqus/CAE-Python joint analysis model,and the optimization obj ective function to evaluate the reverse precision are successively established.Then,the material parameters of the mian rubber spring are determined by the hardness theory estimation method,the dichotomy method,the response surface method and the genetic algorithm.By comparing the accuracy of the each result,it is found that the material parameters obtained based on the genetic algorithm are the most accurate.According to the material parameters determined by the genetic algorithm,the load-displacement curve of the rubber spring is simulated and contrasted to the test results,and the two curves fit well,indicating that the material parameters obtained through the reverse determination can accurately describe the mechanics performance of the rubber material.The genetic algorithm is used to reverse the parameters rubber material of the assisted rubber spring,and also obtained the ideal result.Then,the finite model of the balanced beam assembly is built by using Hyper Mesh,and the static analysis under bending and other working condition is executed.The results show the safety factor of the maximum stress under the torsion working condition is very low,and the structure is at risk of damage.A free modal analysis is performed,and the results show the modal shape and frequency of the balanced beam assembly meet the design requirements.Finally,on the premise of minimum mass,the size optimization design of balanced beam assembly is carried out in order to reduce the maximum stress of torsion.In order to test the reasonability of the optimization results,the static under four working conditions and free mode checking of the o ptimized balanced beam assembly are carried out.The results show the maximum stress of each working condition decreases and the frequency of each low-order mode increases when the mass of the beam assembly decreases.