含缺陷轨道结构随机振动分析

Random vibration analysis of track structure containing imperfections

利用虚拟激励法和商业有限元软件ANSYS的瞬态分析模块,提出一种用于移动多点相干随机载荷下轨道结构振动分析的新方法。利用该方法,建立考虑相邻道床块间剪切效应的3层离散点支承Euler梁轨道模型,分析轨枕吊空对轨道结构随机振动特性的影响。研究结果表明:单个轨枕吊空时,钢轨和空吊轨枕的随机振动主频不变,而它们的位移功率谱峰值和标准差均增幅明显,毗邻正常支承轨道结构的随机振动响应也有了显著增加。

Using pseudo-excitation method（PEM） and the transient analysis module of the commercial finite element system ANSYS, a new method for vibration analysis of track structure under moving multi coherent random loads is presented. Based on this method, the track structure model of rail as a Euler beam supported three layers of discrete elastic points considering the shear effect between the adjacent ballast block is established to analyze the effect of unsupported sleeper on the random vibration character istics of track structure. Numerical results indicate that the single unsupported sleeper doesn＇t change the random vibration main frequency of rail and unsupported sleeper, but their displacement power spectrum peaks and standard deviations obviously increase and the random vibration response of the adiacent track structure has also a significant increase.