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Purpose <p>Passenger comfort in high-speed and long-distance rail journeys is greatly impacted by vibrations, particularly those in the 4–6&#xa0;Hz resonance range, which are highly perceptible to the human body. This study focuses on examining the dynamic interactions between passengers and vehicles through a coupled vibratory model, aiming to develop a framework for enhancing ride comfort by optimizing various parameters.</p> Methods <p>A 52 degree-of-freedom (DoF) coupled human–rail vehicle model was developed, incorporating a 15 DoF anthropomorphic human body model with a 37 DoF rail vehicle structure. The equations of motion were derived using the Lagrangian formulation and solved in MATLAB under harmonic excitations within the 0–80&#xa0;Hz frequency range. Passenger responses were evaluated in terms of natural frequencies, vibration transmissibility, and root mean square (RMS) accelerations of body segments. Ride comfort assessment adhered to ISO 2631-1:1997 whole-body vibration standards. A parametric study was conducted to assess the influence of variations in mass, stiffness, and damping parameters.</p> Results <p>The analysis identified significant resonance effects within the 4–6&#xa0;Hz frequency range, with the head and torso regions exhibiting the highest sensitivity. Parametric modifications resulted in up to a 54% reduction in discomfort levels, underscoring the efficacy of structural and damping adjustments in enhancing ride quality.</p> Conclusion <p>The proposed model offers a comprehensive framework for analyzing human–vehicle dynamic interactions. The findings contribute to the design of human-centered rail vehicles and provide practical insights for enhancing passenger comfort in environments sensitive to vibration.</p>

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Analysis and Parametric Optimization of Ride Comfort in a Coupled 52 DoF Human–Rail Vehicle Model Under Harmonic Excitation

  • 期刊论文

  • 发表日期：

    2026年4月6日

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

摘要

Purpose

Passenger comfort in high-speed and long-distance rail journeys is greatly impacted by vibrations, particularly those in the 4–6 Hz resonance range, which are highly perceptible to the human body. This study focuses on examining the dynamic interactions between passengers and vehicles through a coupled vibratory model, aiming to develop a framework for enhancing ride comfort by optimizing various parameters.

Methods

A 52 degree-of-freedom (DoF) coupled human–rail vehicle model was developed, incorporating a 15 DoF anthropomorphic human body model with a 37 DoF rail vehicle structure. The equations of motion were derived using the Lagrangian formulation and solved in MATLAB under harmonic excitations within the 0–80 Hz frequency range. Passenger responses were evaluated in terms of natural frequencies, vibration transmissibility, and root mean square (RMS) accelerations of body segments. Ride comfort assessment adhered to ISO 2631-1:1997 whole-body vibration standards. A parametric study was conducted to assess the influence of variations in mass, stiffness, and damping parameters.

Results

The analysis identified significant resonance effects within the 4–6 Hz frequency range, with the head and torso regions exhibiting the highest sensitivity. Parametric modifications resulted in up to a 54% reduction in discomfort levels, underscoring the efficacy of structural and damping adjustments in enhancing ride quality.

Conclusion

The proposed model offers a comprehensive framework for analyzing human–vehicle dynamic interactions. The findings contribute to the design of human-centered rail vehicles and provide practical insights for enhancing passenger comfort in environments sensitive to vibration.