车辆荷载引起地面振动的实测研究

对行驶重载卡车引起的地面振动进行现场实测，从加速度峰值、频谱和振级上分析了振动的衰减情况，并用两种方法讨论了扣除背景振动的振级，然后用基于最小二乘原理的模式搜索法拟合出了振动的衰减公式。研究表明：卡车引起的振动主要以垂向为主，随着振源距离的增大，振动逐渐衰减，而且振动在较近的距离内衰减很快，高频部分几乎可以完全衰减，而低频部分的振动随着距离振源的增大，衰减相对较缓，甚至在100米处还有其残余振动。

Field measurements for ground vibration induced by vehicle

To study ground vibration propagation induced by running heavy truck, field measurements of ground vibration were carried out during heavy truck running. Vibration attenuation was studied by peak acceleration amplitude, Fourier spectrum and vibration levels. Component of background vibration was removed from the total ground vibration using two methods, and then a fitted vibration attenuation formula was proposed by adopting pattern search method. It is concluded that, the directional vertical acceleration is the predominant component of the ground-borne vibration. With the increase of the vibration source distance, the vibration attenuates gradually, but there is a rapidly decaying trend near vibration source. From the frequency domain point of view, the high-frequency part is almost completely decayed after a short distance, while the low frequency part of the vibration only show moderate decay along with the distance increasing from vibration source. There is residual vibration of low frequency part even at 100 meters far.