Research On Static And Dynamic Characteristics Of Vehicle Suspension Rubber Bushing

The vehicle suspension bushing is a component that flexibly connects the suspension to the chassis.The main function is to attenuate the vibration transmitted from the wheel to the vehicle body through the suspension.The static and dynamic characteristics directly affect the vehicle performance of the vehicle.Especially in typical conditions such as rapid acceleration,emergency braking,and rough road driving,the suspension bushing can improve the safety,reliability,comfort and steering stability of the vehicle due to its good elasticity,moderate damping and wear resistance..In the design and application of rubber bushings,the traditional method is to develop the design positively through the engineering experience of the researchers combined with the test,so that the efficiency is low,the precision is not up to the requirements,etc.,and the safety impact of the rubber bushing on the suspension assembly is not considered.This paper takes a passenger car suspension torsion beam rubber bushing as the object.The following work was done around the static behavior of the rubber bushing:Firstly,the research status and research trends of rubber material constitutive model are briefly summarized.The uniaxial tensile test of the standard pattern of rubber material is carried out,and the analysis of several commonly used superelastic constitutive models is carried out.The third-order Odgen model was established to describe the accuracy of the constitutive behavior of the suspension rubber bushing.Then,the finite element analysis and the six-way static and dynamic stiffness tests of the six-way static and dynamic stiffness of the suspension rubber bushing are carried out.The analysis results are basically consistent with the experimental results.On this basis,the static and dynamic stiffness of rubber bushings under different compression amount were studied by finite element analysis.The curves of static and dynamic stiffness of bushings with compression amount were obtained.Secondly,the coupling model of rubber bushing and suspension torsion beam is used to verify the Bushing unit instead of static stiffness and dynamic stiffness molds under extreme torsional conditions,steering conditions and maximum brake conditions.The Bushing unit is used to simulate the static stiffness of the bushing and the equivalent dynamic resistance of the bushing.The effects of the static and dynamic stiffness changes caused by the change of the compression amount on the strength of the torsion beam are studied.It is found that with the increase of the compression amount,the maximum stress of the torsion beam decreases under various working conditions,and the maximum stress calculated by the Bushing element equivalent to the dynamic stiffness is lower than that of the simulated static stiffness.Finally,the fatigue life prediction of the suspension torsion beam under the reinforced road surface is carried out.The comparison simulation results are close to the actual life of the torsion beam,which verifies the effectiveness of the analysis method.By using the Bushing unit simulates bushing static stiffness and equivalent replacement bushing dynamic stiffness to studied the effect of the bushing reduction on the fatigue life of the suspension torsion beam,combined with the static and dynamic stiffness values of the suspension bushing under different compression amount.The results show that the fatigue life of the torsion beam has a longer trend with the increase of the compression amount,and it is found that the equivalent dynamic stiffness of the Bushing element is longer than that of the simulated static stiffness.In this paper,based on the static and dynamic characteristics of suspension rubber beam bushing,the constitutive model of rubber material is discussed.The static and dynamic stiffness of rubber bushing are analyzed,and the compression amount and static and dynamic stiffness are combined.The relationship between the torsion beam of the suspension torsion beam,the steering condition and the maximum braking condition and the fatigue life on the road surface are studied.It provides theoretical guidance and reference for the design analysis of rubber parts and suspension systems.