...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Experimental Mechanics >An alternative rail pad tester for measuring dynamic properties of rail pads under large preloads
【24h】

An alternative rail pad tester for measuring dynamic properties of rail pads under large preloads

机译：替代的轨道垫测试仪，用于在大预紧力下测量轨道垫的动态特性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One of the main components in ballasted railway track systems is the rail pad. It is installed between the rail and the sleeper to attenuate wheel/rail interaction loads, preventing the underlying railway sleepers from excessive stress waves. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher effective preloading than anticipated in the past. On this ground, this paper highlights the significance of accounting for effects of preloading on dynamic properties of polymeric rail pads. An innovative test rig for controlling preloads on rail pads has been devised. A non-destructive methodology for evaluating and monitoring the dynamic properties of the rail pads has been developed based on an instrumented hammer impact technique and an equivalent single degree-of-freedom system approximation. Based on the impact-excitation responses, some of the selected rail pads have been tested to determine such modal parameters as dynamic stiffness and damping constants in the laboratory. The influence of large preloads on dynamic properties of both new and worn rail pads is demonstrated in this paper. Additionally, the design criteria, which has been used to take into account the influence of the level of preload on dynamic properties of generic rail pads, are discussed.
机译：压载铁路轨道系统的主要组件之一是轨道垫。它安装在轨道和轨枕之间，以减轻车轮/轨道相互作用的负荷，从而防止下方的铁路轨枕承受过大的应力波。通常，轨道的动态设计依赖于可用数据，这些数据主要集中在特定脚趾载荷下的结构条件。最近的发现表明，轨道不平整会显着放大铁路轨道上的负荷。这种现象引起了人们的担忧，即滑轨垫板可能会比过去预期的承受更高的有效预紧力。在此基础上，本文强调了考虑预载对聚合物导轨垫动态性能的影响的重要性。已经设计出一种创新的试验台，用于控制导轨垫上的预紧力。基于仪器化的锤击技术和等效的单自由度系统近似，已经开发出了一种用于评估和监控滑轨垫动态特性的非破坏性方法。根据冲击激励响应，在实验室中测试了一些选定的滑轨垫以确定诸如动态刚度和阻尼常数之类的模态参数。本文证明了大的预紧力对新的和磨损的履带板的动力学性能的影响。此外，还讨论了设计标准，该设计标准已被用来考虑预载水平对通用导轨垫的动态特性的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号