【摘要】 为了提高高铁地震紧急处置系统的可靠性,研究地震动谱密度强度作为地震报警阈值的计算方法。采用典型的车辆—轨道耦合动力学模型,通过选取不同频率的横向正弦波作为外部激励,对车辆的动力响应进行分析,得到车辆的动力响应随荷载幅值与频率变化的规律;在此基础上求解不同车速下列车脱轨和倾覆时正弦波的临界幅值和对应的速度反应谱,从而得到影响列车运行安全的地震动临界谱密度强度,将其作为高铁的地震报警阈值,将实时计算得到的地震动谱密度强度与临界谱密度强度进行比较,即可判定高铁列车的行车安全性以及是否应发布地震警报并采取紧急处置措施。更多还原

【Abstract】 In order to improve the reliability of earthquake emergency disposal system for high speed railway,the calculation method for earthquake alarm threshold based on the intensity of spectral density was studied.The typical vehicle-track coupling dynamic model was built to analyze the dynamic response of vehicle under the external excitations of the lateral sine waves with different frequencies.In this way,the variation laws of vehicle dynamic response with load amplitudes and frequencies were obtained.On this basis,the critical amplitudes of sine wave at train derailment or overturning under different speed and the corresponding velocity response spectra were worked out.Accordingly,the intensity of the critical spectral density of earthquake motion affecting train operation safety was obtained,which was regarded as the seismic alarm threshold of high speed railway.The intensity of the spectral density of earthquake motion obtained by real-time calculation was compared with the intensity of the critical spectral density to determine the running safety of high speed train,and whether or not to issue an earthquake alarm and take emergency disposal measures.更多还原