FEM modal analysis of vehicle frame based on ANSYS

The vibration character of a vehicle frame is important to the vehicle´s performance and life. A geometry model of a jeep-like vehicle is created by Pro/E 4.0. Modal analysis of the vehicle frame is made and its vibration frequency and characteristics are achieved. The results are shown that the design of the vehicle frame is correct. Comparison of the Block Lanczos solution and the subspace solution of finite element method show that the precise of the subspace solution is higher and vibration characteristics are more regular. In contrast with the subspace solution, the computing time of the Block Lanczos solution is litter. If the computing precise is not very high in fact, the choice of the Block Lanczos solution should be selected.