【作者】 吴兆智； 张楠；

【Author】 Wu Zhaozhi;Zhang Nan;Beijing Jiaotong University;

【机构】 北京交通大学；

【摘要】 中国已成为世界上高速铁路系统最完整的国家。然而,随着列车运行速度的提高,轨道不平顺激励的频率范围将会扩大,这将严重影响列车的舒适性,影响乘客对高质量乘坐舒适性的追求。此外,轨道不平顺的平稳随机性和车体空间分布的差异也导致了列车舒适性的不确定性。因此,采用平稳随机振动分析方法进行列车舒适性的空间分布及其相关影响因素研究具有重要意义,这将保证乘客在每次乘坐过程中的舒适体验,为舒适性优化提供理论支持。首先,采用8个相互独立的车辆单元对列车进行建模。其次,采用虚拟激励法,通过列车加速度响应功率谱密度的线性化,得到舒适性指标斯珀林指标的空间分布。再次,将考虑不同影响因素对列车舒适性的计算结果与蒙特卡罗方法计算结果进行了比较。最后得出了最舒适的区域位于车身中心的前部的结论。改善轨道不平顺,合理控制列车速度,将改善列车的舒适性,但舒适度会随着车体质量的损失和二系悬挂系统的损坏而恶化。更多还原

【Abstract】 China has become the country with the most complete high-speed railway system.However,with the increase of train speed,the frequency range of track irregularity excitation will be extended,which will badly influence the train comfortability against passengers’ pursuit of high-quality ride comfort.Also,the uncertainty of train comfortability results from the stationary randomness of track irregularity and the difference of spatial distribution in car-body.Hence,adopting stationary random vibration method to analyze the spatial distribution of train comfortability and its relevant influential factors is significant,which will guarantee passengers’comfortable experience during each ride and provide theoretical supports for the comfortability optimization.Firstly,the train is modeled with 8 mutually independent vehicle elements.Secondly,Pseudo Excitation Method is adopted,through the linearity of power spectrum density of the train acceleration response,to obtain the theoretical spatial distribution of Sperling index,indicator of comfortability.Thirdly,the results considering different influential factors on the train comfortability are compared with the ones calculated by Monte Carlo simulation.In general,the most comfortable area is located slightly in the front of the center of car-body.Improving the track irregularity and reasonably controlling the speed of train will ameliorate the train comfortability,while it will deteriorate with the loss of car-body mass and the damage of second suspension system.更多还原