轨道系统高频振动分析的动态子结构法

提出了包含钢轨断面弹性变形、轨下不连续支承、横垂向交叉导的轨道高频振动分析模型。根据轮轨特点，提出适合轮轨高频振动分析的阻抗聚缩法。预测结果与试验结果吻合较好。分析表明约８００Ｈｚ以下，钢轨振动表现为整体振动，再高频率钢轨发生断面弹性变形的振动。我国轨道系统第一、第二、阶二振频率分别为１５０Ｈｚ和３２０Ｈｚ，ｐｉｎｎｅｄ－ｐｉｎｎｅｄ共振频率的１２８０Ｈｚ。

Dynamic substructure method for analysis of railway track to high frequency excitation

A new railway track model for high frequency vibration, which includes the deformation of rail's cross|section, the discrete supports and cross receptance, has been established. A wheel/rail contact characteristic have been introduced into the method of substructure impedance condensation to calculate the receptance. The result shows that rail vibrates as a rigid body below 800 Hz, the deformation of rail's cross|section will happen at the frequency higher than 800 Hz, The model predicting results have a better coherence with the experiments one. Chinese railway track receptance has been predicted, the 1 st and 2 nd resonances are 150 Hz and 320 Hz respectively, the pinned|pinned resonance is 1280 Hz.