Fatigue Life Analysis And Optimization Of Suspension Component

Suspension is one of the important components of the vechicle which decides thecomfort stability and reliability. It is the key component to ensure safe operation.Suspension withstands the changing random dynamic load when the vechicle isrunning. It can not get accurate result to check strength of suspension components bystatic strength analysis. It is important issue for designers that how to achieve thequantitative analysis of external loads effect on the fatigue life. In addition, it alsoneeds to solve that how to make lightweight design of suspension components on thecondition that the fatigue life is ensured.The research of road load spectrum editing, automotive suspension multi-bodydynamics modeling and simulation, fatigue life calculation of suspension componentand the topology optimization based on fatigue life were achieved. Following workshave been done in this paper: Firstly, the paper briefly introduces the theorymulti-body dynamics, multiaxial fatigue and topology optimization. The developmentand current situation of domestic and abroad were presented. The main contents ofthis paper was introduced. In consideration of the elastic deformation of anti-roll bar,the rigid body dynamic model and rigid-flexible coupling dynamic model wereestablished to analysis the influence by different modeling method. To reduce theamount of data, the road load spectrum editing was complete on the condition that theimportant load cycles were not deleted. The fatigue life of suspension component wascalculated based on quasi-static analysis method and equivalent stress-strainapproaches. The load spectrum of suspension component was the boundary conditionwhich was calculated by irgid-flexible coupling dynanic model. Taking into accountthe complexity of loads, the multiaxial of stress state of weak area was evaluated toverify the reasonableness of the fatigue life calculation method. The topologyoptimization was achieved based on the stress which produced the most damage in thestress-time spectrum of weak area. The optimization design of knuckle was got on thecondition that the fatigue life was not reduced.