Scholarlink

<p>With the rapid development of China’s high-speed railway system and the continuous increase in train operating speeds, the dynamic interaction between wheels and rails has intensified, making it crucial to address vehicle-induced vibration energy and its propagation to subgrade structures. Taking the CRTSII slab track and simply supported box girders of high-speed railways as the research objects, this paper establishes a coupled vehicle-track-bridge model using MATLAB and ANSYS/APDL. It calculates the time-frequency responses of the vehicle and bridge, and investigates the transfer characteristics of power flow, vibration energy, and transfer rates between structural layers induced by train loads. The results show that vehicle-induced vibration in the track-bridge system shows multi-peak distribution, with dominant low-frequency (1–50 Hz) energy tied to structural natural frequencies. Power flow attenuates most via fasteners, then mortar and sliding interfaces. Fastener stiffness boosts high-frequency (200–800 Hz) but reduces low-frequency (10–100 Hz) energy; damping decreases rail energy while increasing lower-layer energy. Mortar stiffness suppresses high-frequency (100–800 Hz) but enhances low-frequency (1–600 Hz) responses. Transmission efficiency decreases with fastener/mortar stiffness but increases with damping. Fasteners play a key role in broadband vibration control, and mortar layers modulate high-frequency energy transfer to bridges, providing insights for system dynamic optimization.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Vibro-energy transmission in box-girders: Dynamic coupling effects induced by high-speed train loads

  • 期刊论文

  • 发表日期：

    2025年11月8日

查看全文
  • Lingxia Du,
  • Jie Zhang

摘要

With the rapid development of China’s high-speed railway system and the continuous increase in train operating speeds, the dynamic interaction between wheels and rails has intensified, making it crucial to address vehicle-induced vibration energy and its propagation to subgrade structures. Taking the CRTSII slab track and simply supported box girders of high-speed railways as the research objects, this paper establishes a coupled vehicle-track-bridge model using MATLAB and ANSYS/APDL. It calculates the time-frequency responses of the vehicle and bridge, and investigates the transfer characteristics of power flow, vibration energy, and transfer rates between structural layers induced by train loads. The results show that vehicle-induced vibration in the track-bridge system shows multi-peak distribution, with dominant low-frequency (1–50 Hz) energy tied to structural natural frequencies. Power flow attenuates most via fasteners, then mortar and sliding interfaces. Fastener stiffness boosts high-frequency (200–800 Hz) but reduces low-frequency (10–100 Hz) energy; damping decreases rail energy while increasing lower-layer energy. Mortar stiffness suppresses high-frequency (100–800 Hz) but enhances low-frequency (1–600 Hz) responses. Transmission efficiency decreases with fastener/mortar stiffness but increases with damping. Fasteners play a key role in broadband vibration control, and mortar layers modulate high-frequency energy transfer to bridges, providing insights for system dynamic optimization.