Vibration discomfort of supine human body exposed to whole-body vibration: effect of vibration direction and magnitude
研究了振动方向和幅值对仰卧人体主观不适和身体各部位振动传递的影响，发现不同轴向的加权因子可预测不适，胸部未加权加速度与不适高度相关。
Supine postures are increasingly adopted in medical transport, long-duration flights, and other healthcare environments. This study is aimed to identify the effect of vibration direction and magnitude on the objective and subjective responses of the human body in a supine posture. The transmissibilities to the head, chest, abdomen, and thighs of 12 male subjects were measured with single-axis random vibrations in longitudinal (z axis), lateral (y axis), and vertical (x axis) direction at 0.2, 0.4, 0.6, and 0.8 ms−2 r.m.s. Subjective discomfort was determined using the absolute magnitude estimation method. It was found factors of 1.0, 1.5 and 1.0 multiplying with the weighted r.m.s. of input accelerations in x, y, and z axes, respectively, can predict the discomfort. Alternatively, the unweighted acceleration measured at the body, such as at the chest, which was found to highly correlate with vibration discomfort, can be used to predict vibration discomfort of supine subjects.