Journal
SENSORS
Volume 19, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/s19183960
Keywords
modular exoskeleton; knee exoskeleton; back-drivability; wire-driven actuator system; compliant design; neural network; pattern recognition; intention detection
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2019R1C1C1002049]
- National Research Foundation of Korea [2019R1C1C1002049] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, we developed a single leg knee joint assistance robot. Commonly used exoskeletons have a left-right pair, but when only one leg of the wearer is uncomfortable, it is effective to wear the exoskeleton on only the uncomfortable leg. The designed exoskeleton uses a lightweight material and uses a wire-driven actuator, which reduces the weight of the driving section that is attached on the knee directly. Therefore, proposed exoskeleton reduces the force of inertia that the wearer experiences. In addition, the lower frame length of the exoskeleton can be changed to align with the complex movement of the knee. Furthermore, the length between the knee center of rotation and the ankle (LBKA) is measured by using this structure, and the LBKA values are used as the data for intention detection. These value helps to detect the intention because it changes faster than a motor encoder value. A neural network was trained using the motor encoder values, and LBKA values. Neural network detects the intention of three motions (stair ascending, stair descending, and walking), Training results showed that intention detection was good in various environments.
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