• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2018, Vol. 54 ›› Issue (15): 52-59.doi: 10.3901/JME.2018.15.052

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Extraction of the Geometric Parameters of Human Low Limbs Based on Kinematics Analysis of Mechanism

ZHANG Shutao1, QIAN Jinwu2, WANG Xiaoyi1   

  1. 1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003;
    2. School of Mechatronics and Automation, Shanghai University, Shanghai 200072
  • Received:2017-08-19 Revised:2018-01-11 Online:2018-08-05 Published:2018-08-05

Abstract: The geometric parameters of the lower limbs determined by the location of the joint centers (or axes) are the key parameters for gait kinematic measurement and analysis. The existing methods for gait motion measurement based on 3D motion capture instrument need much manual intervention. As a result, these methods have a certain degree of subjectivity, and the measurement accuracy and repeatability are impaired severely. Aim at this problem, the multi-body kinematics model of human lower limb is established based on reasonable simplifications to the body segments and joints of lower limbs. Through kinematic analysis, the configuration scheme of marker set is improved. By constructing the constraint equations of lower limb motion and making full use of a large amount of sample data, an algorithm for joint centers, geometric parameters of the model, and gait kinematics is established. The feasibility of the algorithm and the gait kinematics measurement method is verified by experiment.

Key words: gait, geometric parameters of human low limbs, kinematics, mechanism

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