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A Measure System of zero moment point Using Wearable inertial Sensors

China Communications 2016年第5期13卷 16-27页

作者： Xianggang Zhang Hao Wang Yuliang Shi Changjun Fu Huiqin Wang Guoyu Wang School of Astronautics and Aeronautic University of Electronic Science and Technology of China West China Second University Hospital Sichuan University

Keeping balance is the premise of human walking. ZMP(zero moment point) is a point where total torque achieves balance. It is an important evaluation parameter of balance ability in walking, since it can be used to better reflect the dynamic balance during walking. ZMP can be used in many applications, such as medical rehabilitation, disease diagnosis, treatment and etc. In this paper, wearable inertial sensors system based on MEMS is used to measure ZMP(zero moment point) during walking, which is cheap, convenient, and free from the restriction of lab. Our wearable ZMP measurement system consists of inertial measurement subsystem and PC real-time monitoring station. inertial measurement subsystem includes 9-axis inertial sensing nodes, the body communication network and the central node. inertial sensing nodes are mounted on different parts of the body to collect body posture information in real-time, and then the best estimation of current posture are obtained by kalman filter. The data from sensors is aggregated to the central node through the CAN bus, and then ZMP is calculated. Finally, it can be showed in the PC monitoring station. Experiments prove the system can achieve real-time ZMP detection during walking.

关键词： zero moment point body balance inertial measurement quaternion kalman filter

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