Analysis And Research Of CAE For The Balanced Suspension Taper Leaf Spring Of Automobile

Leaf spring is a important elastic element for heavy truck suspension balance system, which is a significant factor to the comfort and energy saving of heavy truck.Taper leaf spring is more lighter and better comfort compared to traditional leaf spring, which was widely used in heavy vehicles. The suspension performance and safety of Taper leaf spring can be reflected by lean design and fatigue life prediction, the development of CAE technology can provide a powerful tool to solve these problems.According to the CAE investigation of a taper leaf spring in a balanced suspension system. This paper presents a complete process for it, which include optimization design, precise modeling and finite element analysis, and the fatigue life simulation of the integration. Then lean design and digital life prediction of a balanced suspension taper leaf spring is conducted. It provides a certain reference to design and performance study. The detail process as follows:Studied two kinds of structure forms of taper leaf spring, and the parameter optimization of the plate spring is utilized by the MATLAB software.For taper leaf spring 3d model establishment, the more precise and simple modeling method of Pro/E frame bending is presented, and is validated.According to modern contact dynamics related theory, some nonlinear factors is considered, such as large deformation, contact and friction. The finite element model of taper leaf spring is established in the ANSYS Workbench 15.0, checking strength and rigidity of leaf spring, exploring the effect of transition arc radius on the characteristic of leaf spring, stress distribution and deformation, stiffness and frequency of the leaf spring are analyzed under different friction coefficient.To determine the analysis method of leaf spring fatigue life, the basic theory of fatigue life analysis is studied. The influence of roughness, heat treatment and shot peening treatment on leaf spring fatigue life is analysis. By combined ANSYS Workbench with Designlife underthe actual test condition, theprecise integration fatigue life simulation of leaf spring is carried out.In accordance with the relevant standards,stiffness test and fatigue test of taper leaf spring is conducted. Then the finite element analysis and the fatigue life simulation is verified.