Suspension System Dynamics Based on ADAMS

With scientific and technological development, people on car safety, ride comfort, handling stability and ride comfort have become increasingly demanding. In an increasingly competitive situation, the use of new technologies and new methods to improve product competitiveness has become the main way. Set of virtual prototyping modeling, simulation in one, you can shorten the product development cycle, reduce development costs, improve product quality, so as to achieve the purpose of improving product competitiveness. In this paper, the car has the typical structure for the study, the use of multi-body dynamics theory, established based on the ADAMS / Car software platform, the vehicle steering, front and rear suspension, body - seats, tires, and other subsystems, and vehicle dynamics model. The cars were front and rear suspension for a displacement input around the wheel to the beat of the same power input in the simulation and load the ground braking force, lateral force and aligning torque of the simulation. Determined by simulation calculated the degree of lateral vehicle understeer extraversion deformation coefficient, lateral shift deformation distortion coefficient and shift back to positive moment coefficient. Accurately predict the design phase for the automotive suspension, steering and other factors affect the vehicle handling and stability when providing reliable data. According to national standards were conducted on the vehicle model pulse input test ride and ride comfort random input tests. The results showed that: the car pass through the triangle at different speed bump, its maximum acceleration is far less than 31.44m/s2, on the driver's health no harm; random input road ride comfort simulation results are also similar, with the increase the speed of the driver seat acceleration RMS value increases, but the driver will not feel comfortable. In addition, the focus of the front and rear suspension spring stiffness and damping effect on ride comfort, and pointed out that the increase or decrease of each parameter on vehicle ride comfort of the trend. Last of the suspension system parameters on the combined effects of vehicle dynamics. Parametric analysis using selected front suspension stiffness, camber front and rear suspension stiffness countdown countdown, the average of the minimum rear wheel camber as the optimization objective, and without changing the suspension under the conditions of large structures modify the spatial location of points coordinates to analyze the mechanical parameters of suspension handling stability and ride comfort for the impact.The results showed that: the improved suspension may also enhance the car's handling stability and ride comfort. 

Keywords: multi-body dynamics, simulation analysis, handling stability, ride comfort, optimal design