angles_c - Angular Kinematics Angular Kinematics D. Gordon...

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1 Angular Kinematics D. Gordon E. Robertson, Ph.D. School of Human Kinetics University of Ottawa 2 P Three acceptable SI units of measure < revolutions (abbrev. r) < degrees (deg or E , 360 E = 1 r) < radians (rad, 2 π rad = 1 r, 1 rad . 57.3 deg) P Angles are discontinuous after one cycle P Common to use both absolute and relative frames of reference P In three dimensions angular displacements are not vectors because they do not add commutatively (i.e., α + β β + α ) Angular Kinematics Differences vs. Linear Kinematics 3 absolute angles for segments relative angles for joints 4 P Used to define angles of segments P Frame of reference is stationary with respect to the ground, i.e., fixed, not moving P In two-dimensional analyses, zero is a right, horizontal axis from the proximal end P Positive direction follows right-hand rule P Magnitudes range from 0 to 360 or 0 to +/-180 (preferably 0 to +/-180) Absolute or Segment Angles Uses Newtonian or inertial frame of reference
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This document was uploaded on 11/04/2011 for the course MME 512 at Miami University.

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angles_c - Angular Kinematics Angular Kinematics D. Gordon...

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