中文摘要：

为研究轨枕空吊对重载铁路货车与轨道动态相互作用的影响,针对具有二系悬挂的重载货车,在充分考虑非线性作用力基础上,建立了重载货车-轨道耦合动力学模型。在此基础上,研究了轨枕空吊状态下轮轨系统的动力响应;分析了完全空吊和非完全空吊条件下,列车运行速度和空吊轨枕结构参数对轮轨动力性能的影响。结果表明：轨枕空吊破坏了轨道结构支承的连续性,导致轮轨间动态相互作用加剧,尤其是在完全空吊条件下,轮轨垂向力随空吊数量的增加与列车运行速度的提高而显著增大;轨枕空吊还会影响其前后毗邻的正常轨道结构的动态特性;轨枕完全空吊与轨道不平顺的共同作用会加剧轮轨动态作用;轨枕两端支撑间隙不一致时,也会恶化轮轨动态作用。

英文摘要：

In order to investigate the effect of unsupported sleepers on the wheel/rail dynamic interaction on heavy-haul railway,a vehicle-track coupled dynamic model for heavy-haul freights with double suspension systems was built,taking some nonlinear factors into account. The dynamic response of the wheel/rail system was calculated by numerical method and the influences of train running speed and hang sleepers number on the wheel/rail dynamic performances were investigated and compared in the cases of complete unsupported sleepers and incomplete unsupported sleepers. The results show that unsupported sleepers influence the continuity of the track structure support,resulting in the aggravation of the wheel/rail interaction. Especially under the condition of complete hang sleepers,the interaction significantly increases with the increase of the train speed and the amount of hang sleepers. Hang sleepers also affect the dynamic characteristics of the adjacent track structure with normal sleepers. The combined action of complete unsupported sleepers and track irregularities can exacerbate the wheel/rail dynamic interaction. The asymmetric sleeper support gaps at both ends would also exacerbate the wheel/rail dynamic interaction.