Abstract:

The axle and suspension are critical components of vehicles. To achieve real-time simulation of the solid axle and various suspension structures of a commercial vehicle， the property-based modeling technical route is adopted in this paper. The axle's movement is decoupled into motion kinematics and ride dynamics， while the suspension characteristics are divided into coupled carrying characteristics， RC/PC guiding characteristics， and coupled K&C kinematic characteristics. Innovatively considering the pitch dynamic effect of the axle， the nonlinear dynamic coupling relationship of suspension between axles， and the K&C coupling relationship of suspension between axles， a dynamic model for commercial vehicles is developed to trigger the negative phenomenon of brake vibration. Additionally， a K&C testing method for the coupled suspension and a method for model parameter identification are proposed. Finally， the accuracy of the model is validated at the system level by comparing K&C test data with TruckSim model results. Inputting vehicle parameters into the UniTruck software for simulation and comparing the results with TruckSim simulation， the model’s effectiveness is verified at the vehicle level.

Key words: commercial vehicle, solid axle, coupled suspension, balanced suspension, tandem suspension, K&C test