Based On Analysis And Experimental Study Buggy Ride Comfort Simulation Rigid Coupling

This article studies on the ride comfort characteristics of the off-road vehicle during the products development stage by using the Virtual Prototype Technology to make the vehicle ride performance improvement and reasonable matching before batch production. Through applying the combined method of Finite Element Method (FEM) and Multi-Body Dynamic (MBD) to constitute the rigid-flexible coupled vehicle model, the vehicle road test simulation and the research on improvement are discussed. Finally, combining with the actual test results the vehicle ride performance is evaluated.In the process of research, some simulated and analyzed works have been done. Firstly, the simplified mathematical7-degrees off-road vehicle model is built to analyses whether the vehicle’s vibration response frequency belong to the reasonable range. Secondly, in order to study the accuracy of different modeling method and the deform of some important component affects on the vehicle ride, not only the rigid body vehicle model, but also the rigid flexible vehicle model are built in the Adams/car. The flexible parts in the rigid flexible vehicle model include torsion bar spring and upper-lower control arm in the front suspension, gradient leaf spring in the rear suspension and frame, which were completed by using the FEM and MBD methods. Specially, the gradient leaf spring in the rear suspension is focused on. The non-liner beam model, flexible dynamic model and FEM model constructions of the gradient leaf spring are used to simulation and compared with reality stiffness characteristics. Thirdly, according to the relevant national standard about method of vehicle ride comfort running road test, the pulse road and random C-level road are set up to satisfy the simulation. After the simulation completed, some improvement plane will discussed. Lastly, the evaluation of the vehicle ride performance is given through the human perception to vibration response.Base on the above analysis, some conclusions are got. The natural vibration frequency of the vehicle system is in reasonable range. The compared stiffness curves shows that the flexible dynamic leaf spring model simulation curve is approaching test curve. From the simulation weighted RMS acceleration value, the rigid flexible vehicle model is closer to test value. It reflects that making the key parts to flexible bodies will improve the accuracy of simulation. When evaluating the ride performance through the human perception, the rear part of the vehicle is needed improving. While discussing improvement plane, the ride comfort will improve by adjusting the rear damping lower.