仰臥位搬送時の遠心加速度による背面荷重変動のモデル化

概要

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The purpose of this paper is to make a model for estimating a load variation on the back of supine persons which is induced by centrifugal acceleration during transportation by ground vehicles. First, the transportation experiment was conducted for 19 healthy subjects with normal body weight. A minivan without seats was used as an experimental car. In the experiment, the subject lied on the back in the center of the car with his/her eyes covered by an eye mask and the car ran about 820 meters in the range of lateral acceleration from -3 to 3 meters per second squared. At a sampling frequency of 100 Hz, the lateral acceleration acting on the supine subject was measured with an accelerometer and the vertical load acting on the scapula of the subject was measured with a load sensor. From the measured data, it was found that the vertical load variation was proportional approximately to the lateral acceleration. In response to this result, the model to estimate the vertical load variation was constructed as a linear system composed of a first-order lag filter, which eliminates high-frequency noises from the acceleration data, and a proportional gain, which converts the acceleration to the load variation.