Wind-induced safety evaluation and lateral motion control for car parallel overtaking on bridges
To investigate the aerodynamic interaction between"wind-vehicle-bridge"during the parallel overtaking process and its effects on the car's crosswind stability,a combined approach of automotive aerodynamic and system dynamics is proposed.This method is used to carry out a wind-induced safety evaluation for car parallel overtaking on bridges in crosswind environments.First,the transient motion of a car parallel overtaking on a bridge is analyzed using the coupling method of composite wind and moving mesh.This reveals the variations and action mechanism of aerodynamic side force and aerodynamic yaw moment during car parallel overtaking on a bridge.Subsequently,a path-tracking model and linear quadratic optimal control method are used to establish simulation and control systems for car overtaking in crosswinds.Finally,in the absence of lateral motion control,the wind-induced safety capability during a car overtaking a car and a car overtaking a truck is quantitatively evaluated by lateral displacement and yaw angle.Meanwhile,in the presence of lateral motion control,the front wheel angle is considered.The results indicate a noteworthy impact on driving safety resulting from low-pressure regions,which are created by the aerodynamic interaction of"wind-vehicle-bridge".The low-pressure regions with high velocity are situated on the windward side of the overtaken vehicle,and the low-pressure regions with low speed are situated on the leeward side of the overtaken vehicle.This effect on wind-induced safety depends on the type of overtaken vehicle and its travel lane.Overtaking on the first lane of the windward side is highly dangerous for cars.Additionally,caution must be taken when a car overtakes a truck on the second lane of the windward side while the truck is on the first lane of the windward side.The study's research methodology and results can offer a theoretical framework to enhance the wind-induced driving safety capacity of bridges during high winds.
safety systematologysea bridgeovertakingcross-wind stabilityvehicle driving safetyvehicle lateral control
NETL
NSTL
万方数据
维普
