Study On Finite Element Analysis Of Torsion Beam Rear Suspension And Optimization Under NVH Characteristic

As a vital element of the vehicle, the property of suspension system plays an important part in driving. Because of the advantage of simple structure, convenient repair and cheap price, the torsion beam rear suspension, which is a semi independent suspension, has been applied to the A-class vehicle widely in recent years. Nowadays, the research hotspot is understanding the security in driving by analyzing the intension and dynamic of the suspension system.As a part of the chassis design, the torsion beam has a vital influence on operate, stability, ride as well as the features of NVH in driving. Different condition of the road may affect the vehicle comfort in actual driving. And in the process of automobile products applied, the unreasonable problems of the vehicle design are the main point of the noise problems after putting the cars on the market.By establishing the dynamic model to analyze the suspension movement characteristics and compare the simulation results with the experimental data. Then analyze the torsion beam suspension toe Angle, camber Angle, suspension stiffness, Angle measurement, the stiffness characteristics. Meanwhile, load for extracting heart of the torsion beam wheel to apply for static analysis based on the dynamic model.Established the finite element model by using Hypermesh software, and analyze the static by importing Abaqus software in typical working conditions. Meanwhile, analyze the model of free state, access the natural frequency of structure as well as output the flexible body file into ADAMS software to establish the coupled dynamics model.Carry out the NVH experiment according to actual traffic harshness. Analyze and test the performance of vehicle harshness. Found by the experimental results, the noise in the back of the model is too large. It needs for optimization analysis. According to the analysis of the torque beamform, found that the inherent frequency of the torsion beam suspension is agreed with the vehicle noise appear larger peak in the frequency range. Based on this, set up vibration transfer function analysis results show that the torsion beam suspension and vehicle test in actual pavement noise peak frequency range in the large amplitude. According to the engineering experience, Set up three optimization model by using the torsion beam with trailing arm as the optimization goal. Analyze vibration transfer function of three different trailing arm structures and compare them with the original model. The results show that increasing the thickness of the trailing arm can obviously improve inherent frequency, which avoid too much noise frequency range of the phase. Suspension model loading will be the new scheme after the experiment analysis; the results show that the improved suspension is to reduce interior noise. This optimization method can reduce the noise.