| With the improvement of automobile emission requirements and the strict restriction of road regulations,heavy-duty vehicle as an important transportation tool in logistics and transportation,which need meeting the requirements of various regulations,minimizing the quality of curb weight and increasing the load capacity has become the development trends and important development goals of the automobile industry.The balance suspension is one of the important components in commercial vehicles and its bear about 1/4 of the vehicle chassis weight.The weight reduction of balance suspension has very important theoretical significance and engineering application value.This article uses the balanced suspension of a company’s heavy-duty vehicles as a lightweight design target.The main research contents are:(1)Theoretical design calculation of the balance suspension.The relevant parameters of the vehicle is selected,and the performance parameters of the balance suspension according to the vehicle parameters is determined,and then the key components of the balance suspension are theoretically designed and calculated,and then the static deflection of the balance suspension then verified,which ensure the design rationality of balanced suspension.(2)The assembly geometric model of the balanced suspension is established.The key components of the balanced suspension are modeled and assembled using CATIA software to form the assembly geometric model of the balanced suspension,which is weighed according to the material properties of each component.(3)CAE analysis of balanced suspension and determination of its lightweight targets.The balanced suspension assembly geometry model is imported into Hyper Works for pre-processing meshing of CAE analysis,and the processed balanced suspension mesh model is imported into Nastran software for modal analysis,and the natural frequencies and the corresponding natural vibration modes of each order are obtained.Through the loading of the model boundary conditions,Abaqus is used to analyze the static strength of the balanced suspension under the three conditions of Cornering condition,Dynamic condition and Max braking condition,and the overall vonMises stress and displacement,and component stress cloud map are obtained.All CAE analysis results are in line with actual requirements,and based on the analysis results,the lightweight goal of balancing suspension is given.(4)Topology optimization design of the balance suspension.A topology optimization model is established under the boundary condition of the balance axis mass is minimum,the balance suspension mode is above 18 Hz,the balance suspension parts are not invalid under the above three conditions,and minimal displacement.The weight of the optimized balance shaft is reduced by 5.9 kg.At the same time,the optimized suspension modal simulation analysis model and the static strength simulation analysis model are established.Compared with the model before optimization,the results are not much performance different from the original model,and the feasibility and effectiveness of the optimized scheme are illustrated. |
