Finite Element Analysis For Key Components Of Air Suspension System On Heavy Tractor

With the increase of requirements of the ride comfort and integrity of cargo, air suspension has been more widely used. Aiming at the key components of the air suspension system:air spring, support beam and leaf spring bracket, this thesis analyzed these key components by using finite element analysis software ABAQUS and OptiStruct.At first, theory and methods of vertical characteristic analysis of air spring based on ABAQUS were discoursed. The finite element analysis model of air spring was established and simulations were done. The displacement-load curve of air spring of the initial internal pressure for0.3MPa,0.5MPa and0.7MPa were obtained and compared with the test results. The results showed that the calculated results agreed well with test results, which proved the validity of this model and the simulation method.There are four conditions in static analysis of the support beam of the air suspension:impact load condition, the maximal tractive force condition, the maximal braking force and the maximal lateral force condition. The method how to deal with loading and constraint in four conditions was presented. Corresponding analysis file for every condition was established in ABAQUS. The results of stress and deformation of support beam in four conditions have accomplished with ABAQUS. The results showed that the stress of support beam in the four conditions did not exceed the yield limit of the material and deformation was also in line with the actual situation.Finally, theory and analysis process of structural optimization were discussed. The structural optimization model of leaf spring bracket was created and optimized by OptiStruct. The static analysis of the original model and optimized model at the same operating condition were accomplished, the results indicated that the weight of the optimized model was reduced by4.9kg and the optimized model still met the strength and stiffness requirements.