Title :
A bilateral electro-hydraulic actuator system to measure dynamic ankle joint stiffness during upright human stance
Author :
Forster, S.M. ; Wagner, R. ; Kearney, Robert E.
Author_Institution :
Dept. of Biomed. Eng., McGill Univ., Montreal, Que., Canada
Abstract :
A bilateral electro-hydraulic actuator system has been developed to measure the dynamic joint stiffness of the human ankle during standing. The apparatus consists of two foot pedals that are each connected to an electro hydraulic rotary actuator. Transducers are incorporated to measure the position and torque of each actuator, the angle of the ankle with respect to the foot plate, and the positions of the knee and hip. Nonlinear identification techniques will be used to determine the reflex contribution to the overall torque.
Keywords :
biocontrol; biomedical transducers; bone; elasticity; gait analysis; hydraulic actuators; mechanoception; muscle; neurophysiology; plates (structures); position measurement; torque measurement; bilateral electro-hydraulic actuator system; dynamic ankle joint stiffness; electro hydraulic rotary actuator; foot pedals; foot plate; foot posture; intrinsic stiffness; nonlinear identification techniques; position measurement; reflex contribution; stretch reflex; torque measurement; upright human stance; Actuators; Biomedical measurements; Foot; Humans; Mechanical factors; Muscles; Nervous system; Open loop systems; Position measurement; Torque measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Print_ISBN :
0-7803-7789-3
DOI :
10.1109/IEMBS.2003.1279630
