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Optimization-based Differential Kinematic Modeling Exhibits a Velocity-control Strategy for Dynamic Posture Determination in Seated Reaching Movements by Xudong Zhang; Arthur D. Kuo; Don B. Chaffin is a Medicine article available to read on EtoBox.

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We proposed a velocity control strategy for dynamic posture determination that underlay an optimization-based differential inverse kinematics (ODIK) approach for modeling three-dimensional (3-D) seated reaching movements. In this modeling approach, a four-segment seven-DOF linkage is employed to represent the torso and right arm. Kinematic redundancy is resolved efficiently in the velocity domain via a weighted pseudoinverse. Weights assigned to individual DOF describe their relative movement contribution in response to an instantaneous postural change. Different schemes of posing constraints on the weighting parameters, by which various motion apportionment strategies are modeled, can be hypothesized and evaluated against empirical measurements. A numerical optimization procedure based on simulated annealing estimate the weighting parameter values such that the predicted movement best fits the measurement. We applied this approach to modeling 72 seated reaching movements of three distinctive types performed by six subjects. Results indicated that most of the movements were accurately modeled (time-averaged RMSE < 5 degrees) with a simple time-invariant four-weight scheme which rep

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Author

Xudong Zhang; Arthur D. Kuo; Don B. Chaffin

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0021-9290)

Published

1999

Language

EN

Field

Medicine (Health Sciences)