Determination of Noncontributing Forces and Noncontributing Impulses in Three-Phase Motions

[+] Author and Article Information
S. Djerassi

Rafael, P. O. Box 2250, Haifa 31021, Israel

J. Appl. Mech 64(3), 582-589 (Sep 01, 1997) (8 pages) doi:10.1115/1.2788932 History: Received March 26, 1996; Revised October 11, 1996; Online October 25, 2007


Numerous dynamical systems undergo, while in motion, imposition and/or removal of constraints. Three phases of motion are involved: a phase during which the motion is defined as unconstrained, a phase during which the motion is defined as constrained, and an intermediate, transition phase, when constraints are imposed or removed. Noncontributing forces (sometimes called nonworking, reaction forces), and noncontributing impulses, namely, impulses associated with noncontributing forces in the transition phase, play a central role in the mechanics of systems undergoing such motions, and are the subject matter of the present paper. Specifically, a six-step procedure is introduced for the determination of noncontributing forces and of noncontributing impulses throughout three phase motions.

Copyright © 1997 by The American Society of Mechanical Engineers
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