| China’s auto industry, which has become the world’s largest car market, wasexperiencing an explosive development for the past few years, but the share of self-ownedbrand has always been low. Therefore, enhancing the technology and brand image ofself-owned cars, building vehicle research platform are the key to China’s automobileindustry soaring again. Combined with the major technology projects of Jilin province--Thecomprehensive matching performance and lightweight research of car chassis part, this thesisexplores analytical methods for chassis products while engaging in the lightweight researchof the twist beam suspension of a domestic car.Firstly, FEM (Finite Element Model) of twist beam suspension was built by Hypermeshand vehicle multibody dynamics model of rigid--flexible coupling was established by Adams,which include torsion beam suspension of flexible subsystem and other rigid subsystems. Theaccuracy of FEM was verified through modal test and the precision of virtual prototypemodel was validated based on handling stability and ride performance test data. Secondly,after extracting the joint load between torsion beam and body, spring, absorber and wheelfrom vehicle multibody dynamics model under four typical conditions, the structural strength,stiffness, modal and K&C characteristics of twist beam was analysised. Finally, this part isabout the lightweight optimization design of twist beam. Twist beam model wasreconstructed by topology optimization and parametric model was established in Mesh Works,multi-objective optimization model (RBF approximation model, Multi-island GA) wasstudied by Isight. Minimize the weight and torsional stiffness of twist beam as the objectivefunction and treat structural strength, stiffness, modal as the constraint condition.The twist beam, compared with the original one, has not only get18.8%weight loss, butalso meets the performance requirements. A lightweight optimization method for twist beamsuspension has been obtained through this thesis. |
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