Abstract
This paper describes a dynamic model of the ankle joint in which ago- and antagonistic muscle groups are under functional electrical stimulation. To the first approximation these muscles perform the dorsal and plantar flexion of the ankle. The model describes the behaviour of the joint in isometric and in free movement conditions. Considered are the delays between excitation and response, and three non-linearities, namely; the stimulating voltage threshold, the Coulomb friction in the joint, and different muscle behaviour during contraction and relaxation. The majority of model parameters were directly measured on from 3 to 10 normal subjects. The rest of parameters were determined by the brute-force method of parameter identification on one normal subject. The real system responses to different stimulating functions are compared to the respective responses of the model simulated on a digital computer. The response agreement is investigated in the frequency and time domains.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.