Independent Suspension Modeling And Finite Element Analysis

Suspension system is the main chassis assembly parts. In the course of driving, suspension has a very important role:1.Suspension transfer the force and torque between frame (or body)and wheels;2Suspension reduces the frame (or body) the pavement impact load, attenuation pavement to frame shock (or body) bring vibration, to ensure the ride comfort of the car.According to the project requirement, this paper will analyze the suspension system parts (low control arm, steering knuckle)’s force and the stress distribution in extreme conditions for the subsequent experiment and the fatigue analysis provides the data.This article through the multi-body dynamics theory, the finite element theory and related software Adams, Patran, Nastran to complete the project content. Among them the modeling part is divided into two contents:1Using adams build multi-body dynamics model of a suspension system, In the course of modeling with a different method modeling the antirool bar and lower control arm and do the model of simulation contrast.2Build lower control arm and steering knuckle of the individual parts and both of assembly body finite element mode, using the mixture of shell element and entity unit modeling method modeling lower control arm using mpc simulate the Globe hinge between low control arm and steering knuckle. Analysis section also is divided into two aspects:1Through free load simulation of suspension dynamics mode get the force of lower control arm and steering knuckle in extreme conditions. According to force of lower control arm,steering knuckle, imposed load and the constraints on both to get the maximum stress and the stress distribution.Through this research got following results:1suspension key parts of the finite element modeling method;2the hinge finite element modeling method;3independent suspension multibody dynamics modeling methods;4the method of geting the force of lower control arm and steering knuckle in extreme conditions. Through to the suspension in finite element analysis got maximum stress value and the stress distribution in extreme conditions and provides data for fatigue analysis and test.