A 1/4 car model of railway vehicle with primary suspension is built. The influence of time delayrnon system dynamic performances is analyzed. According to the theory of critical instability, the value of the critical time delay for high-speed EMU at 300 km/h is computed and the stability in different time delay area is researched. According to the transfer properties of systems, the effects of time delay on frequency response are analyzed. Simulation and analysis of car body under deterministic excitation and track irregularity random excitation is conducted. The results of frequency response analysis show that the calculating method of the critical time delay of system instability based on time delay theory is valid.%建立包含一系阻尼在内的铁道车辆垂向1/4模型,分析了时滞对系统动态特性影响.根据临界失稳分析理论,计算出了时速300 km级高速动车组的失稳临界时滞大小,分析了不同时滞区域的稳定性状态.根据系统传递特性,分析了时滞对系统频响特性的影响.对确定性激励和轨道不平顺随机激励作用下的车体振动情况进行仿真分析.频响分析和仿真结果证明了系统失稳临界时滞理论分析的正确性.
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