Parametric Modeling Of Rubber Bushing With NVH Of Vehicle

The ride comfort of the car not only affects the vibration environment of the passengers,but also affects the fatigue service life of various parts of the vehicle as a whole.Good ride comfort has become one of the standards to evaluate the performance of a car.Rubber bushing can not only play the role of connecting parts in the vehicle,but also reduce vibration and noise and affect the ride comfort of the vehicle due to its mechanical properties of hyperelasticity and viscoelasticity.Today,rubber bushing has become a key component affecting the driving performance of the vehicle.In this paper,the finite element model of rubber bushing is established by fitting the test data of rubber material.The static and dynamic mechanical properties of rubber bushings were analyzed,and the parameterized modeling of rubber bushings was carried out by using different modeling methods in the multi-body power software,and the influence of rubber bushings on the ride comfort of vehicles was studied.Specific research contents are as follows:Firstly,mechanical properties were obtained through basic tests of rubber materials.The constitutive model of rubber material was fitted based on ABAQUS software,and the specific parameters of the constitutive model were obtained.The thirdorder Ogden model and the third-order Prony series were selected to express the hyperelastic and viscoelastic mechanical properties of rubber materials respectively.Secondly,the static and dynamic mechanical characteristics of the rubber bushing at the key joint of the vehicle were analyzed by using the finite element method,and the stress-strain curve was obtained.The classical parameterized mathematical model of rubber bushing was selected,and the parameterized mathematical model was fitted with the specific data obtained from the test and simulation,so as to obtain the specific parameters of the rubber bushing model.Then,in the multi-body dynamics software ADAMS,the parametric model of rubber bushing was expressed by using the feature file method,the spline interpolation method and the subroutine method.In addition,the software Hyperwork is used to flexibly process the body-in-white and the lower arm.Meanwhile,according to the vehicle parameters,rigid bodies such as the front and rear suspension system and steering subsystem are built in ADAMS/ CAR.In order to improve the accuracy of the model construction,the rigid-flexible coupling multi-body dynamics vehicle model was built in the virtual prototype.Finally,the ride comfort simulation analysis was carried out according to the national standard to verify the relationship between the rubber bushing and the ride comfort of the vehicle.The modeling methods of different parameterized rubber bushing were analyzed and compared,and it was shown that the accuracy of the subroutine method to establish the rubber bushing model was higher.With the help of the optimization tool in ADAMS/Insight,the experimental optimization design of the rubber bushing parameters was carried out for the purpose of improving ride comfort.By comparing the results before and after optimization,the ride comfort of the vehicle has been improved to a certain level.