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<p>This study investigates lateral low-frequency oscillations of railway vehicles with IC-based secondary suspensions. A full-vehicle dynamic model under measured track irregularity excitation is established to analyze modal interaction among the carbody, bogie, and inertial container (IC). An IC–spring–damper structure is proposed for the secondary suspension. A coupling-degree index is introduced to quantify carbody–bogie interaction, and a Euclidean similarity-based modal tracking approach is used to follow mode evolution with speed. Simulations show that the IC-based suspension effectively reduces modal coupling and suppresses lateral low-frequency vibration: the maximum coupling degree decreases from 93 to 74, the RMS lateral acceleration decreases by 54.8 %, and the low-frequency vibration energy decreases by 65.7 %. The frequency-capture phenomenon around 120 km/h is mitigated. Experimental data validate the baseline vehicle model, while the improved performance of the IC-based suspension is predicted by simulations and will be verified by future tests.</p>

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Analysis of lateral low-frequency oscillations of railway vehicles with IC-based secondary suspensions

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Dilai Chen,
  • Jiahui Li,
  • Guofeng Chen,
  • Zhongkai Zhang,
  • Wenming Cheng,
  • Cong Huang

摘要

This study investigates lateral low-frequency oscillations of railway vehicles with IC-based secondary suspensions. A full-vehicle dynamic model under measured track irregularity excitation is established to analyze modal interaction among the carbody, bogie, and inertial container (IC). An IC–spring–damper structure is proposed for the secondary suspension. A coupling-degree index is introduced to quantify carbody–bogie interaction, and a Euclidean similarity-based modal tracking approach is used to follow mode evolution with speed. Simulations show that the IC-based suspension effectively reduces modal coupling and suppresses lateral low-frequency vibration: the maximum coupling degree decreases from 93 to 74, the RMS lateral acceleration decreases by 54.8 %, and the low-frequency vibration energy decreases by 65.7 %. The frequency-capture phenomenon around 120 km/h is mitigated. Experimental data validate the baseline vehicle model, while the improved performance of the IC-based suspension is predicted by simulations and will be verified by future tests.