Analysis Of The Performance Of Rear Drive Axle Suspension With Rubber Bushing

With extensive use of rubber bushing in the suspension system, the car in a moving process in suspension performance parameters have kinematics changes with the tire jumping up and down or under the external load,which is very unfavorable to the ride vehicle handling and stability. But rubber bushing in reducing the inherent frequency of the suspension system to enhance body comfort and NVH performance is very favorable. Therefore, this paper for the non-independent rear suspension of a SUV focus on the kinematics and dynamics simulation analysis, and the changes in stiffness of rubber bushing on the suspension performance.Firstly, the kinematic model of the non-independent rear suspension is established by using the ADAMS/Car professional module. And on changes of wheel alignment parameters(toe angle, camber angle, caster angle, kingpin inclination angle), wheelbase and track, suspension roll center height of suspension performance evaluation parameters were about wheel parallel beating and reverse beat simulation test on the suspension model. The influence of different bushing stiffness on the kinematic performance of the suspension is studied.Secondly, based on the sensitivity analysis theory, selecting the larger upper and lower control arm before and after the hard point coordinates and horizontal thrust rod left hard point coordinates.Analysis of the hard point coordinates of suspension kinematics performance influence larger hard points is done, then based on the multi-objective optimization, using ADAMS/Insight optimization algorithm of optimal design of suspension kinematics performance. The simulation results show that the suspension kinematics performance is improved by using the ADAMS/Insight orthogonal test method.Finally, the use of CATIA software establish three-dimensional geometric model of suspension,suspension element attribute is defined in the module of ADAMS/View, defining element properties,creating tires, helix spring and shock absorber, add a hinge and rubber bushing constraints and completed the non-independent suspension multi-rigid-body dynamics model, using ADAMS/View software and the ADAMS/Vibration on the dynamics model of the suspension were analysis in time domain and sinusoidal sweep excitation frequency response analysis in frequency domain, suspension of the first ten order natural frequency and vibration mode are obtained, and to study the effect of change on the lower control arm, lateral thrust bar and shock absorber etc. on the inherent frequency of the suspension.