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<p>This short communication presents a 52-DoF coupled human–rail vehicle framework (15-DoF seated human + 37-DoF rail vehicle) for segment-wise ride-comfort assessment under harmonic excitation (0–80&#xa0;Hz), emphasizing the discomfort-sensitive 4–6&#xa0;Hz band. The coupled equations are solved to obtain natural frequencies, transmissibility and RMS accelerations, and comfort interpretation is linked to ISO 2631-1 criteria. Sensitivity-based parametric tuning (± 30% mass–stiffness–damping variation) demonstrates resonance shift and suppression of dominant amplification in critical segments, supporting comfort-oriented tuning decisions beyond vehicle-only indicators.</p>

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Biomechanical–Mechanical Coupling in Rail Vehicle with a 52-DOF Model for Ride Comfort

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Ramajogi Naidu Doddi,
  • Ramji Koona,
  • Srihari Palli

摘要

This short communication presents a 52-DoF coupled human–rail vehicle framework (15-DoF seated human + 37-DoF rail vehicle) for segment-wise ride-comfort assessment under harmonic excitation (0–80 Hz), emphasizing the discomfort-sensitive 4–6 Hz band. The coupled equations are solved to obtain natural frequencies, transmissibility and RMS accelerations, and comfort interpretation is linked to ISO 2631-1 criteria. Sensitivity-based parametric tuning (± 30% mass–stiffness–damping variation) demonstrates resonance shift and suppression of dominant amplification in critical segments, supporting comfort-oriented tuning decisions beyond vehicle-only indicators.