Mathematical Modeling of Human Gait in a Rehabilitation Exoskeleton Using Gait Video Analysis Method
https://doi.org/10.21869/2223-1560-2021-25-3-27-40
Abstract
Purpose of research One of the ways to increase effectiveness of rehabilitation systems for patients with musculoskeletal disorders is the use of exoskeletons, which make it possible to ensure lower limbs movement according to the laws close to natural gait set by the rehabilitation therapist. The article considers a method based on construction of ankle joint motion trajectories (AJ) followed by synchronous determination of rotation angles of lower limb links based on numerical solution of inverse kinematics problem. It is known that the use of simplified laws of ancle joint movement and feet without taking into account anthropometric parameters of a patient leads to the formation of an incorrect gait and, as a result, a significant increase in rehabilitation time of a patient. Therefore, when constructing mathematical model of ankle motion patterns, it is proposed to use the method of video capture of marker points selected on AJ and foot, followed by processing and approximation of received signals using polynomials, which provides high accuracy of reproducing motion patterns. Purpose of research is to build motion laws of exoskeleton links along the trajectory of AJ motion based on a numerical solution of inverse kinematics problem.
Methods. Experimental walking studies with the construction of AJ motion trajectory based on video fragment, smoothing and approximation of this trajectory and solving reverse kinematics problem are used to achive this goal.
Results. Method for construction and processing of foot motion trajectory and finding kinematic characteristics of links motion for creation of exoskeleton motion patterns in gait is introduced.
Conclusion. Simulation results shows that proposed methods of constructing motion trajectory and gait modeling of the exoskeleton make it possible to copy the gait of a person with high accuracy in rehabilitation process.
Supporting agencies: The work was carried out with the support of the RFFI grant No. 19-08-044A.
About the Authors
A. Pechurin
Southwest State University
Russian Federation
Russian Federation
Alexander S. Pechurin, Master's Degree Student, Department of Mechanics, Mechatronics and Robotics
50 Let Oktyabrya str. 94, Kursk 305040
A. V. Fedorov
Southwest State University
Russian Federation
Russian Federation
Andrei V. Fedorov, Post-Graduate Student, Department of Mechanics, Mechatronics and Robotics
50 Let Oktyabrya str. 94, Kursk 305040
A. S. Yatsun
Southwest State University
Russian Federation
Russian Federation
Andrey S. Yatsun, Cand. of Sci. (Engineering), Head of Research Laboratory MIR, Associate Professor, Senior Researcher of Department Mechanics of mechatronics and robotics
ResearcherID N-6212-2016
50 Let Oktyabrya str. 94, Kursk 305040
S. F. Jatsun
Southwest State University
Russian Federation
Russian Federation
Sergey F. Jatsun, Dr. of Sci. (Engineering), Professor, Head of Department Mechanics of mechatronics and robotics
ResearcherID G-3891-2017
50 Let Oktyabrya str. 94, Kursk 305040
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Review
For citations:
Pechurin A., Fedorov A.V., Yatsun A.S., Jatsun S.F. Mathematical Modeling of Human Gait in a Rehabilitation Exoskeleton Using Gait Video Analysis Method. Proceedings of the Southwest State University. 2021;25(3):27-40. (In Russ.) https://doi.org/10.21869/2223-1560-2021-25-3-27-40
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