Scholarlink

<p>Fastener failure critically threatens the safety and stability of high-speed railways. To systematically investigate the effects of fastener failure configuration and scale on the dynamic performance of vehicle and track systems, a rigid vehicle-flexible track coupled model was developed, integrating multibody dynamics and finite element theory. The results identify the vertical wheel-rail contact force and vertical rail displacement as sensitive indicators for both single-side and double-side fastener failure configurations. The safety limit is defined as 2 single-side or 2 pairs of double-side fasteners at speeds of 250 km/h and 300 km/h, which decreases to 2 single-side or 1 pair of double-side fasteners at 350 km/h. The influence zone exhibits directional asymmetry, extending further downstream than upstream, and single-side fastener failure produces a broader influence zone than double-side fastener failure. In the frequency domain, fastener failure downshifts the primary low-frequency peaks of the wheel-rail contact force PSD and amplifies the mid-to-high frequency components of the vertical rail acceleration PSD. These findings provide a theoretical basis for optimizing fastener system maintenance and developing vibration-based detection techniques.</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

Comparative study on dynamic responses of high-speed vehicle and track systems to varying fastener failure configurations

  • 期刊论文

  • 发表日期：

    2026年3月9日

查看全文
  • Xin Xin,
  • Suxia Zhou,
  • Zunsong Ren

摘要

Fastener failure critically threatens the safety and stability of high-speed railways. To systematically investigate the effects of fastener failure configuration and scale on the dynamic performance of vehicle and track systems, a rigid vehicle-flexible track coupled model was developed, integrating multibody dynamics and finite element theory. The results identify the vertical wheel-rail contact force and vertical rail displacement as sensitive indicators for both single-side and double-side fastener failure configurations. The safety limit is defined as 2 single-side or 2 pairs of double-side fasteners at speeds of 250 km/h and 300 km/h, which decreases to 2 single-side or 1 pair of double-side fasteners at 350 km/h. The influence zone exhibits directional asymmetry, extending further downstream than upstream, and single-side fastener failure produces a broader influence zone than double-side fastener failure. In the frequency domain, fastener failure downshifts the primary low-frequency peaks of the wheel-rail contact force PSD and amplifies the mid-to-high frequency components of the vertical rail acceleration PSD. These findings provide a theoretical basis for optimizing fastener system maintenance and developing vibration-based detection techniques.