摘要
通过建立连续弹性离散点支承上Timoshenko梁的钢轨模型,运用车辆-轨道耦合动力学理论,模拟计算了室内模型轨道轨下支承失效状态下轮轨系统动力响应,分析了列车运行速度与扣件失效数量对轨道结构动力性能的影响,并进行了时域与频域内的试验分析与验证。结果表明:轨下扣件失效破坏了轨道结构支承的连续性,轮轨间相互作用增强,并随其失效数量的增加与列车运行速度的提高而显著增大;同时,扣件支承失效将影响其前后毗邻的正常轨道结构的动态特性,形成较长范围内线路不平顺,影响车辆运行平稳性与乘坐舒适度。钢轨频响函数测试表明,由于扣件支承失效改变了该区段轨枕间距与轨下支承刚度,削弱了道床对线路所提供的阻尼,轨道结构的动力性能也产生了显著变化。
By representing the model of rail as a Timoshenko beam resting on the periodic elastic foundation,the dynamic effect of rail fastener support failure on the railway track is studied based on vehicle-track coupling dynamics.Considering the vehicle＇s running speed and the number of the fastener failures,the track dynamic characteristics are investigated and verified by the experiments on a scale model wheel/rail test rig in the time and frequency domains.The results show that as the existed fastener failures leading to the discontinuous track support,the wheel-rail interaction is excited and increases as further fasteners become failure-supported and as the vehicle＇s running speed increases.The well-supported tracks adjacent to the fastener failures experience increased dynamic forces which will lead to further deterioration of track quality and the formation of long wavelength track irregularities,which worsen the vehicles＇ running stability and riding comfort.It is also found from the rail frequency response function experiments that as the sleeper spacing and the stiffness under rail being changed among the local region unsupported by the ballast,the dynamic behaviour of track with fastener support failures is affected.
出处
《振动工程学报》
EI
CSCD
北大核心
2011年第2期158-163,共6页
Journal of Vibration Engineering
关键词
轨道结构
扣件支承失效
轮轨相互作用
试验验证
频响函数测试
track
fastener support failure
wheel-rail interaction
test verification
frequency-response function experiment
