Research and Parameter Optimization on Ride Comfort and Road Friendliness of Interconnected Air Suspension for Commercial Vehicles

In order to improve the ride comfort and road friendliness of heavy commercial vehicles, a lateral interconnected air suspension system is developed. Based on the theory of thermodynamics and vehicle dynamics, a Ten-degree-of-freedom vehicle dynamics model with lateral interconnected air suspension is established. Interconnected pipeline parameters’ influence on characteristics of air suspension system in whole vehicle are calculated and analyzed. Simulation results show that the stiffness of air suspension decreases gradually with the increase of interconnected pipeline diameter. The designed interconnected air spring experiments verify the simulation results. Simulation on vehicle dynamics models is carried out by building random road models with different roughness levels in MATLAB. Taking the RMS value of the cab seat acceleration and “95 percentage fourth power aggregate force” as evaluation indicators, the effect of the inner diameter of the orifice on the interconnected air springs is studied. The research results show that choosing a suitable inner diameter of the orifice can effectively improve the ride comfort and road friendliness of commercial vehicles. What's more, the multi-objective particle swarm optimization algorithm is used to optimize the parameters of the interconnected air spring, and the Legendre uncertainty analysis method is combined to make the optimized parameters have a good optimization effect under different road unevenness, driving speed and load size.