Measurement and Bio-dynamic Model Development of Seated Human Subjects Exposed to Low Frequency Vibration Environment

In this study, the effect of posture, vibration magnitude and frequency on seat-to-head (STH) and back support-tohead (BTH) transfer functions has been studied under vertical sinusoidal vibration. Twelve healthy male subjects were participated in experimental work to measure vertical vibration transmitted to the occupants head in three representative postures (erect, vertical back on and forward lean on table) under three magnitudes of vibration (0.4, 0.8 and 1.2 m/s 2 r.m.s.) in frequency range 1 to 20 Hz. From collected data sets, the effect of vibration magnitude, vibration frequency and postures on STH and BTH transmissibility’s and phase has been drawn over the prescribed frequency range. The result suggested that inclusion of all possible variables in optimal design of vehicle seat, suspension and comfort analysis most benefit for better design and analysis. The comparison of experimental and model response reveals that both models matched with mean experimental data sets most closely and the models provide best description about biodynamic response study of seated human subjects under vertical whole body vibration. Keyword: Human Vibration, Seated posture, seat to head transmissibility, low frequency vibration