Research On Vehicle Semi-active Suspension Considering Vehicle Road Coupling

This paper aims the damage of heavy-duty vehicle to the road has become increasingly prominent,and traditional research on vehicle suspension control of simplified vehicle dynamics model without considering the influence of vehicle-road coupled.The research on vehicle suspension control considering the coupling of threeaxle heavy vehicle and road is proposed.1/2 constrained discrete dynamics model for a three-axle heavy-duty vehicle is established by applying the Udwadia-Kalaba equation.Afterwards,obtaining the vehicle driving dynamics model,considering vehicle-road coupling,by coupling the 1/2 vehicle model with the Euler-Bernoulli beam model,based on nonlinear Winkler foundation,through point contact tire model.Based on this vehicle-road coupled system dynamics model,designing the roadfriendly control strategy with high robust,time-critical and stable performance for vehicle semi-active suspension using fuzzy PID control theory,which aims to reduce vehicle dynamic load coefficient.Through MATLAB numerical simulation,comparatively study the dynamic response of vehicle and road of passive suspension and semi-active suspension with fuzzy PID control,under the influence of vehicle-road coupled.The simulation results show,compared to the traditional vehicle passive suspension,the three-axle heavy-duty vehicle dynamic load coefficient reduced by 23.8%,4.9% and 24.3% by applying the fuzzy PID controller.Meanwhile,the road vibration amplitude decreased effectively due to the moving load effect reduction of three-axis heavy vehicles on the road.