侧向风荷载对人-车-路系统耦合振动的影响分析

Influence Analysis of the Body-vehicle-road Coupled Vibrating System under the Side Wind

采用谱解法模拟脉动风荷载场,根据风洞试验测得的车辆的空气动力参数,计算出作用在车辆侧面的风荷载;将风荷载加到人-车-路耦合振动系统方程中,建立起考虑其影响的系统耦合振动方程;采用人体加权竖向振动加速度均方根值对车辆乘坐舒适度进行评价,并对模拟风速场及侧向风速大小对车辆乘坐舒适度的影响进行讨论.分析表明:静态风减小了人体、车辆振动加速度的最大值,但对其加速度均方根值没有影响;脉动风作用下人体振动加速度最大值略有变化,但均方根值却增大较多;侧向风荷载场对路面结构的振动几乎没有影响;平整路面下乘坐者出现不舒适感的临界风速为55m/s,A级不平整路面出现不舒适感的临界值为15m/s.

The fluctuating wind field is simulated by the harmony superposition method. The wind load is calculated according to the vehicle aerodynamic coefficients which are measured by the wind tunnel experiment. The wind load is added to the body-vehicle-road system functions, and the dynamic func- tions of the coupled system are derived. The vibrating comfort of the vehicle is appraised with the RMS of the body vibrating acceleration. The results indicate that the static wind reduces the maxi- mum of human body and vehicle vibration acceleration, but has no influence on the RMS of accelera- tion; the vibration acceleration of the human body increase a litter, but the maximum of the RMS in- creases a bit under the fluctuating wind; Side wind load has no influence on the vibration of the pave- ment structure; the critical wind speed when the body feels discomfortable is 55 m/s on the smooth road surface, and it＇s 15 m/s on the grade level A road surface.