Study on the Difference of Vehicle Aerodynamic Characteristics Between Static and Dynamic Analysis Models

The issues with coupling vibrating of the wind-vehicle-bridge system are related to not only vehicle ride comfort but also driving safety. Static vehicle-bridge model and dynamic vehicle-bridge model are built up respectively and the aerodynamic coefficients as a function of wind direction are analyzed. Then based on the analysis results from the static numerical wind tunnel simulation and dynamic numerical wind tunnel simulation, the overturning and sideslip critical wind speeds of vehicle running at different speeds on dry, wet, snow, icy road conditions under different yaw angles wind action were calculated respectively. Results show that, while vehicle running on the bridge, it should consider the interaction between the vehicle-bridge system and natural wind to study the aerodynamic characteristics of vehicle and driving safety. While vehicle running on a long-span bridge under different yaw angles wind excitation, it is not safe to take safety critical wind speeds under cross wind excitation as safety critical wind speeds. © 2019, Chinese Mechanical Engineering Society. All right reserved.