Analysis And Optimization Wheel Alignment Parameters And Ride Comfort Based On Multi-body System Dynamics

With the development of society and the continuous improvement of people's life, and a swift development has happened in traffic and transportation. At the same time, people have a higher demand for traffic and transportation. To ensure the safety, high efficiency and comfort of traffic and transportation, the research of automotive ride comfort is getting more and more important. Automobile ride comfort is one of the most important performances of automobile. Many automobile companies are researching the automobile ride comfort and improving it to enhance the competitive power of their own automobile.First, the theory of multi-body dynamics and the software—ADAMS are introduced briefly in the paper. Secondly, the vehicle is divided into front suspension, rear suspension, person-chair system, steering system, tires and transmission subsystems, and then ADAMS were used to establish a multi-body dynamics software subsystem dynamics model. These subsystem were assembled together to establish a frame of the vehicle dynamics model with the body and frame, which is verified accurate through the trial.Then the front suspension kinematics is simulated which gains the rule of suspension frame affecting the front wheel orientation parameter. The results show that, the parameters of the front wheel alignment are reasonable, but the toe angle, camber angle and scrub radius need to be optimized. Therefore wheel orientation parameter is optimized to make it reasonable which will improve the performance of the vehicle.The evaluation of ride comfort and the course of building a random road are introduced. The comfort character of the car is evaluated with virtual prototype technology which is to understand the performance of vehicles from different angles. The simulation result is analyzed and evaluated and, generally speaking, this car performs good ride comfort.Finally, the factors that affect vehicle ride comfort such as vehicle speed, road conditions and suspension parameters which includes spring stiffness, the shock absorber damping and the tire stiffness are analyzed. The trend of vehicle ride comfort affected by rising and reducing of these parameters is gained. Four kinds of optimization methods are proposed and various parameters are studied in this paper. Finally we obtain the best results and supplied a bright direction for improving the ride comfort of vehicles.