Study On Optimized Design Of Suspension System For Certain Off - Road Vehicle

As one of the key parts of vehicles, suspension system has great influence to the ride comfort and handling stability of off-road vehicles. Therefore, studying the structure improvement and performance optimization of suspension system has very important significances. Based on the suspension system of a certain off-road vehicle in this paper, the performances of the off-road vehicle were improved through the optimization designs of the hard point coordinates and performance parameters (stiffness and damping) for the front suspension.Firstly, based on the Adams software, the subsystem models of the off-road vehicle were established such as the front and rear suspensions, steering system, lateral stabilizer bar, body, tires, braking system and power system, etc. All of the subsystems models were assembled as a full vehicle model.Then, according to the relevant international and national standards, the ride comfort simulations of the random road input and pulse road input for the full vehicle model were carried on. It turned out that the ride comfort was unsatisfactory when the off-road vehicle was driving on the sandy rode and the ride comfort was better when driving on the road with triangle input pulse. The simulation results were compared with the road experiment results for the full vehicle, and the accuracy of the established full vehicle model were verified.Finally, through the simulation analysis of the front suspension, the large variation ranges of the front wheel alignment parameters which were against the vehicle steering stability were acquired. The variation ranges of wheel alignment parameters became more reasonable through the optimization design of hard point coordinates for the front suspension, and the handling stability of off-road vehicles were improved at the same time. And the optimum matching of stiffness and damping parameters was obtained by the optimization design of performance parameters for the suspension. Then the ride comfort of the off-road vehicles was improved by reducing the RMS value of vertical weighted acceleration for the driver’s seat.