Research On Ride Performance Simulation And Tests Of A Light Truck

Light truck plays an important role in transportation of city road.At the same time,consumers’ requirements on the quality is getting higher and higher.Consumers concerned more about the ride performance and comfort of the vehicle,which makes the vehicle’s vibration performance becoming an important concern for vehicle manufacturers.When the car is driving,the unevenness of the road and the motivation of the engine affect the ride performance and comfort of the vehicle.As one of the important vibration performance of the light truck,ride performance affects the driver’s ride comfort and the integrity of the goods.The Paper did research on ride performance of the light truck on the cooperation projects of Beijing Institute of Technology and BEIQI FOTON MOTOR CO LTD.For the analysis of vehicle ride performance,I bulit a multi-body dynamics model in ADAMS/CAR.The model carried out a ride performance simulation analysis,the influence of parameters such as suspension damping parameters,vertical stiffness of the tire,cab suspension stiffness,seat suspension stiffness and other parameters on ride comfort is analyzed.Orthogonal experiments were used to optimize the parameters.After that,we found the powertrain mounting system can not meet the design requirements,to sovle this problem,combining with vibration isolation theory and decoupling theory of powertrain mounting system,I established a vibration model of the powertrain mounting system in ADAMS/VIEW and calculated its natural frequency and energy distribution.Next,I did sensitivity analysis for the design variables and combined with genetic algorithm to establish mathematical model to get a better optimization results.The steering wheel of a light truck has a jitter problem on idle condition.I combined with the finite element analysis method and sensitivity analysis method to solve the problem and the structure of the steering system was optimized.We did model test on the vehicle,the powertrain mounting system and the steering system and got modal parameters.Finally,we did road test on the light truck and got the ride performance data of the real vehicle at different speeds.The result verified the simulation results of the established multi-body dynamics model.At the same time,the results of powertrain mounting and steering system optimization were verified.