在温度和列车动态下,对长跨桥的卧式升降装置的精细建模和合振动分析
Zhehua Zhang1,2, Yun Zhang1,2, Jianfeng Mao3,4,5
1School of Civil Engineering, Central South University, Changsha, 410075, Hunan, China.
Scientific reports
|April 3, 2025
概括
在高速铁路桥梁中优化紧固件间距是安全的关键. 更宽的距离显著影响列车动力学,影响移位和加速度,这对运行稳定至关重要.
科学领域:
- 土木工程 土木工程是指土木工程.
- 机械工程 机械工程
- 铁路工程 铁路工程是指铁路工程.
背景情况:
- 高速列车 (HST) 运行需要特殊的安全性和流性,特别是在穿越桥梁结构时.
- 桥梁区域,包括大跨度连续和简单支的梁桥,由于火车轨道桥的相互作用,存在动态挑战.
- 桥梁梁端的温度诱导的轴移动会影响紧固件间距,影响轨道动态.
研究的目的:
- 开发和验证精细的合列车-轨道-卧式起重装置-桥梁 (TTSB) 系统模型.
- 模拟和分析火车通过大排量起床装置 (LSD) 区域的动态反应.
- 调查变化的紧固件间距对HST动态和安全参数的影响.
主要方法:
- 开发一个精细的合TTSB动态模型.
- 在 250-425 公里/小时的速度下,列车动态的数值模拟.
- 对从0.35-0.85米的紧固件间距效应的分析.
主要成果:
- 增加紧固件间距显著改变垂直/横向移位和加速 (高达45.8%).
- 降低车轮负载率和脱轨系数随着紧固件间距的变化而波动,这表明安全影响.
- 改进后的模型显示了动态模拟的精度和计算效率的提高.
结论:
- 紧固件间距是桥上HST的关键设计参数.
- 结果为优化轨道结构设计提供了见解,以提高安全性和稳定性.
- 经过验证的TTSB模型对于分析桥梁区域的动态性能是有效的.
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