To counter problems inherent in extravehicular activities (EVA) and complex space operations, an exoskeleton, a unique adaptive structure, has been designed. The exoskeleton fits on the hand and powers the proximal and middle phalanges of the index finger, the middle finger, and the combined ring and little finger. A kinematic analysis of the exoskeleton joints was performed using the loop-closure method. This analysis determined the angular displacement and velocity relationships of the exoskeleton joints. This information was used to determine the output power of the exoskeleton. Three small DC motors (one for each finger) are used to power the exoskeleton. The motors are mounted on the forearm. Power is transferred to the exoskeleton using lead screws. The control system for the exoskeleton measures the contact force between the operator and the exoskeleton. This information is used as the input to drive the actuation system. The control system allows the motor to rotate in both directions so that the operator may close or open the exoskeleton.


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    Title :

    Design and control of a hand exoskeleton for use in extravehicular activities


    Contributors:
    Shields, B. (author) / Peterson, S. (author) / Strauss, A. (author) / Main, J. (author)

    Conference:

    IAF, International Astronautical Congress ; 1993 ; Graz, Austria


    Publication date :

    1993-10-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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