Wireless Ground Reaction Force Sensing System Using a Mechanically Decoupled Two-Dimensional Force Sensor
- Authors
- Kim, Sangjoon Jonathan; Gu, Gwang Min; Na, Youngjin; Park, Junghoon; Kim, Yeongjin; Kim, Jung
- Issue Date
- Feb-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Force measurement; Force; Strain; Wireless sensor networks; Wireless communication; Force sensors; Ground reaction force (GRF); mechanically decoupled; reflective optical sensor; shear force; two-dimensional force sensor
- Citation
- IEEE-ASME TRANSACTIONS ON MECHATRONICS, v.25, no.1, pp 66 - 75
- Pages
- 10
- Journal Title
- IEEE-ASME TRANSACTIONS ON MECHATRONICS
- Volume
- 25
- Number
- 1
- Start Page
- 66
- End Page
- 75
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/2518
- DOI
- 10.1109/TMECH.2019.2948650
- ISSN
- 1083-4435
1941-014X
- Abstract
- We present the design process of a mechanically decoupled two-dimensional force sensor (M2D) for the implementation of a wearable ground reaction force (GRF) sensing system. The proposed sensor is capable of sensing up to 1000 and $ \pm \text{300 N}$ in the vertical GRF (vGRF) direction and the anterior-posterior GRF (apGRF) direction, respectively, with accuracies of $\text{2.81} \pm \text{0.29}\%$ and $\text{1.67} \pm \text{0.15}\%$, respectively. With only two reflective optical sensors for each M2D, one for each axis, the mechanical structure of the M2D allows two-dimensional forces to be measured with an axial interference of approximately 1.37% and 2.39% and a repeatability of 0.95% and 1.35% for vGRFs and apGRFs, respectively. A wireless, wearable GRF sensing system was implemented using two M2Ds attached to the outsole of a shoe: one at the heel and the other at the forefoot. The normalized root mean square error value between a conventional stationary force plate and the proposed system for 30 consecutive steps of five subjects was approximately $\text{4.93} \pm \text{2.56}\% $ and $\text{4.22} \pm \text{2.12}\% $ for the vGRF and the apGRF, respectively.
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