The Proceedings of the Symposium on sports and human dynamics
Online ISSN : 2432-9509
2018
Session ID : B-34
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Motion estimation of COM of standing human body using reaction force
(Application to frontal plane model)
*Tatsuki HIGAKIMotomichi SONOBEYoshio INOUEKyoko SHIBATA
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

In order to evaluate the balance ability and diagnose the disease, it is necessary to measure the standing motion easily and accurately. The purpose of this study is to estimate small motion of human body from force plates during standing on swaying support surface. This paper discusses a posture estimation method for the frontal plane. Accurate posture estimation method from the force plates requires an appropriate kinematic chain representing the lower body. We defined a three-link chain as a mechanical model of lower body and single-link as a model of upper body. Assuming that subjects stand with their stance parallel and movement of upper body synchronizes with lower body, we can simplified the mechanical chain to an single-degree of freedom system. Based on the equation of motion, the present method can estimate the posture angle and the angular acceleration of the body from shearing force and center of pressure measured by force plate and acceleration of support surface. To verify the validity of the estimation method, we conducted sway test using an electric board equipped with two force plates. Comparing the posture estimated from the force plates by the present method with that from motion capture system, it was found that sufficient estimation accuracy can be obtained by the proposed method.

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© 2018 The Japan Society of Mechanical Engineers
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