吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (1): 145-152.doi: 10.13229/j.cnki.jdxbgxb201501022

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Assessment and analysis of lower limb joint kinematics based on nonintrusive virtual sensing method

LIU Kun，ZHAO Jianchen，HAN Xuan   

  1. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2013-09-16 Online:2015-02-01 Published:2015-02-01

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Abstract: In this paper, a novel approach for analysis of the kinematics of lower limb joint based on non-intrusive virtual sensors is presented. With the signals obtained from a wearable sensor system, the method, which combines a physical-sensor-difference-based algorithm and virtual-sensor-difference-based algorithm, is used to calculate the rotational angles of the virtual sensors supposed to be fixed on the knee joint. Then the data is used to analyze the knee joint kinematics in anatomical coordinate system. To test the approach, a wearable sensor system composed of accelerometers and magnetometers is developed and evaluated on the lower limbs of five subjects. The results show that, without intrusive sensors, the proposed approach is suitable for detecting and analyzing the parameters of the kinematics of lower limb joint with wearable sensor system. After the measuring accuracy is improved, the approach can be applied for gait analysis.

Key words: technology of instrument and meter, doublesensor difference based algorithm, nonintrusive virtual sensing, joint kinematics analysis

CLC Number: 

  • TP212.9
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