Experimental and numerical study on the effect due to passengers on flexural vibrations in railway vehicle carbodies
Experimental and numerical study on the effect due to passengers on flexural vibrations in railway vehicle carbodies
复制标题
乘客对铁路车辆车体弯曲振动影响的实验与数值研究
DOI：
10.1016/j.jsv.2015.01.001
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发表时间：
2015
影响因子：
4.7
通讯作者：
T. Takigami
中科院分区：
文献类型：
--
作者：
T. Tomioka;T. Takigami
通过实验和数值计算研究了乘客对铁路车辆车体垂直弯曲振动的影响。主要关注的是乘客引起的阻尼效应。在三种不同类型的实际铁路车辆上进行了振动测量试验，包括静态激励试验和商业线上的运行试验，以改变乘客的数量、姿势和分布。测量结果表明，在激振力或加速度作用下，所测得的频响函数和加速度功率谱密度的峰值频率变化不大，而有乘客乘坐时，峰值频率大幅降低。结果表明，乘客对车体弯曲振动的作用不是附加质量，而是阻尼元件。乘客的阻尼效应出现在几个弯曲模式，并显着诱导，即使是少数乘客。还进行了数值研究，以开发分析模型，用于表示与乘客的车体振动的测量结果。结果表明，采用一个简单的单自由度乘客模型，包括一个大阻尼比的质量-弹簧-阻尼器，可以很好地模拟由于乘客引起的车体频响函数的变化。
The effects of passengers on vertical flexural vibrations of railway vehicle carbodies have been investigated experimentally and numerically. The primary focus is the damping effect caused by passengers. Vibration measurement tests, including stationary excitation tests and a running test on a commercial line, were conducted on three different types of actual railway vehicles for varying the numbers, postures and distributions of passengers. The measurement results showed that the peak frequencies in the measured FRF (frequency response function) and acceleration PSD (power spectral density) in response to excitation force or acceleration changed only a little; in contrast large reduction of the peak values was observed when passengers were aboard. These results show that passengers behave not as additional mass but as damping elements upon the carbody flexural vibrations. The damping effect by passengers appeared over several flexural modes and was significantly induced even by few passengers. Numerical studies were also carried out to develop analytical models for representing the measured results of the vibrations of carbody with passengers. It was shown that the change of the carbody FRF due to passengers could be simulated well by using a simple one-degree-of-freedom passenger model comprising a mass–spring–dashpot with a large damping ratio.