横向紊流风中移动车辆纵向风速谱分析

Analysis on Longitudinal Wind Speed Spectrum of Moving Vehicles Under Turbulent Crosswind

为研究横向紊流风中移动车辆纵向风速谱的相关特性,通过Taylor冻结假设,基于von Kármán谱得到了移动车辆风速谱的解析表达式,分析了15°~175°风偏角、风速与车速比值等因素对移动车辆风速谱的影响,深入探讨移动点风速谱峰值及其对应频率之间的关系。结果表明:移动点风速谱峰值比静止点风速谱峰值大;当车速小于风速时随着风偏角逐渐增大移动点风速谱峰值先减小后逐渐增大,当车速大于风速时移动点风速谱峰值则是先减小后增大又逐渐减小;当车速小于等于风速时,部分风偏角时的移动点风速谱峰值对应的频率小于静止点风速谱峰值对应的频率;随着车速与风速比和风偏角的增大,移动点风速谱峰值对应的频率先增大后减小。

To investigate the longitudinal wind speed spectrum characteristics of moving vehicles under turbulent crosswind,the expression of wind speed spectrum of moving vehicles was obtained from von Kármán spectrum based on the Taylor’s frozen flow hypothesis.The influences of wind deflection angle of 15°~175°,vehicle speed to wind speed ratio and other factors on the wind speed spectrum of mobile vehicles were analyzed,the relationship between the peak value of the wind speed spectrum and its corresponding frequency at the moving point was discussed in depth.The results show that the peak value of moving point wind speed spectrum is larger than that of stationary point.When the vehicle speed is less than the wind speed,the peak value of moving point wind speed spectrum first decreases and then increases with the wind deflection angle increasing.When the vehicle speed is greater than the wind speed,the peak value of moving point wind speed spectrum decreases first,then increases gradually,and decreases gradually.When the vehicle speed is equal to the wind speed,the frequency corresponding to the peak value of moving point wind speed spectrum is less than that corresponding to the peak value of stationary point at the partial wind deflection angle.With the increase of vehicle speed to wind speed ratio and wind deflection angle,the frequency corresponding to the peak value of moving point wind speed spectrum increases first and then decreases.