Finite Element Analysis And Topology Optimization Design Of Automobile Transmission Housing

With the rapid development of automobile technology,automobile energy consumption and pollutant emissions and other issues become increasingly prominent,energy-saving and emission-reduction ideas continue to win support among the people.The development of a conservation-oriented society has become an indispensable trend of national development.As one of the effective ways to achieve energy-saving and emission-reduction,automobile lightweight has a certain practical value and guiding significance in some degree.In this paper,combined with the actual production needs of an enterprise,for the issues of the off-road vehicle transmission housing,which is characterized by the large weight and the low rigid strength in the production trail.The free mode,modal test,structural strength and structural topology optimization of the housing are analyzed,so as to realize the lightweight design.On the basis of briefly describing the current situation of automobile lightweight research at home and abroad,the lightweight technology of transmission housing and the optimization design method of structure.This paper puts forward the design concept,which combines the finite element analysis technique and topology optimization design method.According to the two-dimensional design drawings of the transmission housing,the 3D model is established in CATIA,and the finite element analysis model is established by using Hypermesh.Based on the above conditions,the free mode analysis,constrain mode analysis and the related modal test are conducted.The simulation results show that the transmission housing has good dynamic characteristics in some degree.The experimental results show that calculated modal coincides with the experimental mode,and the calculation error is under 3%,which verifies the correctness of the finite element model of the transmission housing established in Hypermesh.Then,analyzing the structural strength of the transmission housing under the static load condition.Combined with the principle of mechanical design and material mechanics,the load of the gear is analyzed,and the relevant load of the transmission housing under mechanical condition and hydraulic condition are obtained.The software ANSYS is used to analyze the structural strength of the housing under different working conditions.The results show that the maximum stress under the three conditions is less than the allowable stress of the housing material,and the deformation doesn't affect its working performance.Finally,the mathematical model is established based on the variable density method.The corresponding design variables,constraint functions and objective functions are defined in the software Optistruct,and then the optimal design is implemented.According to the optimization cloud figure,the corresponding structural improvement of the housing is carried out.Through the finite element analysis of the improved transmission housing,it is found that the strength of the improved housing is basically the same as that of the original housing,also the weight of the improved housing is about 7% less than the original one,achieving the desired results.In addition,in order to study the effect of the new alloy material,on the basis of the above structure optimization,using aluminum alloy material instead of cast iron material,to achieve further lightweight work.