Ride Comfort Enhancement and Vibration Response Analysis of a Coupled 52-DoF Human-Rail Vehicle Model under Random Excitation
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Abstract
This research introduces a comprehensive vibratory model of a human-rail vehicle system with 52 degrees of freedom (DoF), combining a 15-DoF human body model with a 37-DoF rail vehicle framework. The model is crafted to replicate how passengers react dynamically to random stimuli across a frequency range of 0-80 Hz, with a specific focus on the 4-6 Hz resonance band, which is linked to discomfort in the human body. Using the Lagrangian formulation, equations of motion were derived and solved in MATLAB to determine natural frequencies, vibration transmissibility and root mean square (RMS) accelerations of human body segments. Ride comfort evaluations were performed based on ISO 2631-1:1997 whole-body vibration standards. A parametric study was conducted to assess the effects of variations in mass, stiffness and damping properties on passenger comfort. Results indicate that strategic modifications to model parameters achieved up to an 89% improvement in comfort for critical body regions such as the head and torso.
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