MODELLING OF THE BIODYNAMIC RESPONSE OF THE HUMAN BODY TO FORE-AND-AFT VIBRATION

摘要

Modelling of the dynamic responses of humans to vibration is widely reported in the literature but with great focus on responses due to vertical vibration than any other direction. The aim of this paper is to present a model that can predict the apparent mass of the human body during whole-body fore-and-aft vibration. A two degree-of-freedom lumped parameter linear model with rotational capability was developed to predict the fore-and-aft apparent mass measured on the seat during fore-and-aft excitation. The model gave close fit to both the median and individual responses of 12 male subjects. The model suggested that the whole mass on the seat including the thighs/upper legs undergo rotational motion when exposed to fore-and-aft vibration. The model also suggested that the first peak of the fore-and-aft apparent mass is produced by a rotational vibration mode which is consistent with observations reported in previous experimental studies.