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Requesting Help to Convert Rotation Sequences

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  • Requesting Help to Convert Rotation Sequences

    Dear Colleagues:

    I am using ADAMS (Mechanical Dynamics Inc.) to study the effects of
    prostheses design on human gait.

    In ADAMS V9.0, motions can be specified to act directly between a pair
    of markers. To control the orientation of the I marker with respect to
    the J marker, ADAMS requires a Body-three 1-2-3 Euler rotation
    sequence. If the rotations between two markers have been measured in
    the global sequence z, y, x (which corresponds to a Space-three 3-2-1
    rotation sequence), the user has to convert this to a Body 1-2-3
    rotation sequence before specifying it in a motion.

    I wonder if any of you have ever programmed such conversion. I have
    looked in the Biomch-l archives and found PRP.FOR by Woltring
    (1988-02-22), but I am not sure that this corresponds to my needs.
    Ideally, I would like to be able to convert any Body-three, Body-two,
    Space-three, or Space-two rotation sequence into a specific Body or
    Space rotation sequence:

    ex: - converting from Space-three 3-2-1 to Body-three 1-2-3
    - converting from Body-two 3-1-3 to Body-three 2-3-1
    - converting from Body-three 1-3-2 to Space-two 1-3-1
    - etc...

    Thanks for any help,

    Martin Masson