Abstract
Neurological time delay is one of the important elements threatening human postural stability. Previous studies mainly focused on the neural controller to stabilize a human size inverted pendulum model. What kind of postural control mechanism is necessary for compensating neurological time delay by controlling muscles still remains a question. This research proposed to investigate whether a stance control model with constant feed-forward control input to muscles will enable the musculoskeletal model to stand when neurological time delay exists. A musculoskeletal model with 70 muscular-tendon actuators was used to represent the human body. We hypothesized that stance postural control model consists of both feedback and feed-forward control. And the latter one is a pre-added constant control input, necessary to keep musculoskeletal model standing when there is no neurological time delay, to the muscles for compensating neurological time delay. We calculated feed-forward controls and found the longest neurological time delay it could compensate. As a result, we succeeded in keeping a musculoskeletal model standing when neurological time delay was 65ms at most, where transmission time delay was 45ms and activation dynamics time delay was 20ms.
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