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

被引:6
作者
Duan, Pu [1 ]
Li, Shilei [2 ]
Duan, Zhuoping [1 ]
Chen, Yawen [3 ]
机构
[1] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
[2] Harbin Inst Technol, Shenzhen Grad Sch, Sch Mechatron Engn & Automat, Shenzhen 518055, Peoples R China
[3] Xeno Dynam Co Ltd, Shenzhen 518055, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2017年 / 7卷 / 11期
关键词
real-time prediction; Takens' reconstruction method; human locomotion; synergy; data fusion; HIGH-GAIN OBSERVERS; WALKING; MOTION;
D O I
10.3390/app7111130
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
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页数:18
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