Study On Vehicle Ride Comfort Based On Rigid-flexible Coupling Nonlinear Suspension

The suspension system is mainly used to transfer force and torque between wheel and chassis and is amortized the collision load from road to chassis, the suspension system is decayed the vibration of the supporting system from the collision load and is guaranteed the ride comfort of the vehicle. So the nonlinear factor and flexible deformation of the suspension components are shouldn't neglected. It's necessary to study the nonlinear factor and flexible bodies of the suspension system in the research of the dynamics of vehicle system, and it's also necessary to study the influence of the nonlinear disposal and flexible disposal.The quarter car suspension system is established with ADAMS/View software, and the simulation for the dynamical performances of suspension system is studied. The stiffness of suspension spring and the damp of absorber are treated with given nonlinearization, and these nonlinear coefficients are altered in certain range, it's influence of the mostly three dynamics analysis indexes which contains the vertical acceleration of vehicle body, the deformation of suspension and the dynamic load of tire, the variety tendency and proper span of these nonlinear coefficients stiffness of suspension spring and the damp of absorber.According the parameters of the certain off-road vehicle suspension system, the front suspension system model, the rear suspension system model, man-chair system model, tire model and the random road model are established with ADAMS/View software, and the multi-body dynamics whole vehicle model is established based on these models.The flexible models of the transverse stabilizer rods, the lower control bars of the front suspension and the longitudinal bars of the rear suspension are established with MSC.Patran and MSC.Nastran software. So based on rigid-flexible coupling nonlinear suspension whole vehicle model is established with ADAMS/View, the multi-body dynamics linear whole vehicle mode and rigid-flexible coupling nonlinear suspension whole vehicle model are put in same simulation circumstance, compare the simulation results of the ride comfort of the two models. The simulation results show that the ride comfort consequences of the rigid-flexible coupling nonlinear suspension whole vehicle model are better than these of the multi-body dynamics linear whole vehicle mode, it's necessary to establish the rigid-flexible coupling nonlinear suspension whole when study the ride comfort. The research of this thesis provides some valuable conclusions and simulation approach for the design of suspension system, which can instruct the design, research performance estimate and effectively reduce the manufacturing periods and cost of suspension system.