变速移动质量作用下轨道动力响应解析解研究

列车进出站的振动及噪声问题不容忽视,然而目前关于列车变速移动问题的研究相对较少。为了研究进出站列车对周围环境的振动影响,在轨道结构频域周期性解析模型基础上,求解了单个及系列移动质量、移动质量系统变速移动下轨道结构的动力响应。通过求解变速移动质量下简支梁的动力响应,与已有算例进行对比,验证了计算模型的正确性。研究结果表明:移动质量作用下轨道动力响应远大于移动力作用下的动力响应；由于移动质量和轨道结构间的相互作用,轨道的动力响应中包含了较多的振荡成分；随着移动加速度的增大,轨道动力响应略有增大。

ANALYTICAL STUDY ON THE VIBRATION RESPONSE OF THE TRACK SUBJECTED TO THE MOVING MASS WITH VARIABLE SPEEDS

The vibration and noise induced by the moving train entering or leaving stations can not be ignored. However, only a few studies have been carried out on the problem of the moving train with variable speeds currently. In order to study the environmental vibration due to moving trains entering or leaving stations, the vibration response of the track structure subjected to single and series moving masses, moving mass systems was studied, based on the frequency-domain periodic analytical model of the track structure. The vibration response of the simply supported beam subjected to the moving masses with variable speeds was calculated and compared with the results in the references to verify the analytical model. The research results indicate that: the vibration response of the track structure subjected to the moving mass is much bigger than that subjected to the moving force; and more oscillation is generated by the interaction of the moving mass and the track structure. Furthermore, the vibration response of the track structure increases slightly with the increase of the moving acceleration of the moving masses.