Wheelchair Propulsion Analysis Using Quaternions
نویسندگان
چکیده
Mathematics requires three markers to define a local coordinate system to calculate rotations in three dimensions (3D), as three coordinates are necessary to specify the orientation of a rigid body with respect to a fixed set of space axes. However, it is not uncommon in wheelchair literature to find papers (Veeger, et al., 1991) that used only two markers to define segment rotation in three dimensions and subsequently use the results to calculate joint forces. But two markers cannot define a rotation matrix. If someone does not use rotation matrices, results are confined to report segmental projection angles and not directional cosines.
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