Performance Analysis And Structure Optimization Of Hybrid Air Suspension

Air suspension is a widely used suspension and has a wide range of applications in the automotive,railway and other industries.The hybrid air suspension is a kind of air suspension,which not only can realize the ideal suspension characteristics,but also is easy to be reformed,The suspension structure is simple and the cost is low.In this paper,the dynamic and static performance of the hybrid air suspension is deeply analyzed by multi-body dynamics and finite element analysis.(1)This paper is based on the hybrid air suspension parameter matching theory,the threepart stiffness of bushing,leaf and air spring are considered comprehensively.The factors affecting the vertical stiffness and roll stiffness of the suspension and the matching method of the air spring,the guiding arm and the damper are analyzed.(2)The bushing deformation coupling relationship of the hybrid air suspension and the K&C adjustment scheme are analyzed.The rigid-flexible coupled dynamics model of the hybrid air suspension is established,and its K-characteristics and C-characteristics are analyzed to evaluate the deformation coupling of the leaf bushing and the lateral thrust rod bushing.Furthermore,the influence of the bushing stiffness on the performance of the suspension K&C is analyzed,and the adjustment scheme for changing the stiffness of the bushing to the K&C performance of the suspension is analyzed.(3)The mechanical theory model of the hybrid air suspension and the rigid-flexible coupled vehicle dynamics model are established.The theoretical model considers the nonlinear stiffness of the air spring and the leaf spring contact model,and analyzes the deformation coupling of the leaf spring in the vertical,lateral and torsion directions under the roll state.The two models solve the load of key nodes under various extreme conditions.The theoretical model and the dynamic model are studied separately for the engineering application method of load analysis.(4)The leaf spring-bracket-frame finite element model was established to study the structural optimization scheme of the leaf spring and the bracket.The finite element model considers the contact surface and bolt pre-tightening force to analyze the action mechanism of the bracket and the frame.Based on this,the bolt arrangement is optimized,the structure of the bracket and the leaf spring is optimized.(5)This paper combines with the engineering practice to establish a " Hybrid Air Suspension Load Analysis Software Platform",which can realize parameter matching,load calculation,structural strength analysis and optimization with quick operation.