| As China’s auto production continues to increase,energy shortages and environmental pollution have become prominent issues in the sustainable development of China’s auto industry.Light vehicles have become the need for today’s conservation-oriented society.In the face of increasingly serious environmental problems and energy shortages,lightweighting is a very pressing issue in the automotive field.In this paper,a torsion beam of a car is taken as the research object.Firstly,the experimental test equipment is selected to understand the working principle of the experimental test.The experimental platform is built.The dynamic signal analysis test system and the modal test software LMS are used to respectively study the working stress and free mode of the torsion beam.The experimental test is carried out to obtain the stress of the torsion beam under torsion condition and the natural frequency in the free state.The finite element model of the torsion beam is established and simulated by the finite element software HyperWorks.The finite element model is verified by comparison with the experimental test results.The correctness of construction and numerical simulation analysis.Based on the correct finite element model,the constraints and force loading of the lateral left,side to right,forward braking,backward braking,longitudinal front and longitudinal longitudinal conditions are analyzed and analyzed,and then the torsion beam optimization is analyzed and calculated.Front torsional stiffness.Based on this,the influence of component thickness on torsion beam mass,torsional stiffness,maximum stress and first-order natural frequency is analyzed.Four component thickness parameters of longitudinal arm thickness,beam thickness,spring seat thickness and axle plate thickness are selected as optimization variables.The orthogonal test optimization method is adopted,and the thickness of the trailing arm,the beam,the spring seat and the axle plate are selected as the variable factors.The mass of the torsion beam,the torsional stiffness,the maximum stress and the first-order natural frequency are selected as the optimization targets,and the variable thickness combination is analyzed.The results were simulated and analyzed.It is known from the results that it is difficult to achieve the working performance index of the torsion beam with a single evaluation index.Then the objective function optimization study is constructed with its weighted combination.The optimization results show the combined weighted target of torsion beam mass,torsional stiffness,maximum stress and first-order natural frequency.The function optimizes the component thickness combination,obtains a better thickness combination,controls its index in a better range,and improves the optimization effect of the torsion beam structure.Because the experimental design of the response surface method is reasonable,the software Design-Expert is used to establish the optimal combination of the thickness of the component and the four evaluation targets to solve the component thickness.Therefore,it is widely used in the optimization research of automobile parts structure.The BBD test design is used to reasonably distribute the thickness of the components.The response surface method is used to establish the quadratic polynomial response surface model of the torsion beam mass,torsional stiffness,maximum stress and first-order natural frequency under typical conditions,and four models are constructed.Optimized.Taking four response surface models as the objective function,the thickness combination of the torsion beam components is optimized within the corresponding constraint range,and the longitudinal arm thickness is 4.5mm,the beam thickness is 3.5mm,the spring seat thickness is 3.0mm,and the wheel plate thickness is 5.5mm.The optimized torsion beam model was numerically simulated and analyzed.After optimization,the torsion beam was reduced by 1.6Kg compared with that before optimization,and the optimization effect was achieved. |
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