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Appl. Sci. 2017, 7(11), 1130; https://doi.org/10.3390/app7111130

Bio-Inspired Real-Time Prediction of Human Locomotion for Exoskeletal Robot Control

1
The State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2
School of Mechatronics Engineering and Automation, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China
3
Xeno Dynamics Co. Ltd., Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 25 October 2017 / Accepted: 31 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Bio-Inspired Robotics)
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Abstract

Human motion detection is of fundamental importance for control of human–robot coupled systems such as exoskeletal robots. Inertial measurement units have been widely used for this purpose, although delay is a major challenge for inertial measurement unit-based motion capture systems. In this paper, we use previous and current inertial measurement unit readings to predict human locomotion based on their kinematic properties. Human locomotion is a synergetic process of the musculoskeletal system characterized by smoothness, high nonlinearity, and quasi-periodicity. Takens’ reconstruction method can well characterize quasi-periodicity and nonlinear systems. With Takens’ reconstruction framework, we developed improving methods, including Gaussian coefficient weighting and offset correction (which is based on the smoothness of human locomotion), Kalman fusion with complementary joint data prediction and united source of historical embedding generation (which is synergy-inspired), and Kalman fusion with the Newton-based method with a velocity and acceleration high-gain observer (also based on smoothness). After thorough analysis of the parameters and the effect of these improving techniques, we propose a novel prediction method that possesses the combined advantages of parameter robustness, high accuracy, trajectory smoothness, zero dead time, and adaptability to irregularities. The proposed methods were tested and validated by experiments, and the real-time applicability in a human locomotion capture system was also validated. View Full-Text
Keywords: real-time prediction; Takens’ reconstruction method; human locomotion; synergy; data fusion real-time prediction; Takens’ reconstruction method; human locomotion; synergy; data fusion
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Duan, P.; Li, S.; Duan, Z.; Chen, Y. Bio-Inspired Real-Time Prediction of Human Locomotion for Exoskeletal Robot Control. Appl. Sci. 2017, 7, 1130.

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