Effects of Flexibility and Damping on Momentum Transfer During Locking of Two Moving Links, Part I: Numerical Simulation

[+] Author and Article Information
W. Szyszkowski, K. Fielden

Mechanical Engineering Department, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada

J. Appl. Mech 65(2), 479-484 (Jun 01, 1998) (6 pages) doi:10.1115/1.2789079 History: Received February 12, 1997; Revised September 30, 1997; Online October 25, 2007


The system consisting of two links and two joints is examined. The joints are idealy frictionless when unlocked. Due to flexibility of the links, the locking generates some damped vibrations. It is demonstrated that the presence of these vibrations, even of very small and seemingly neglegible amplitudes, have dramatic effects on the after-locking motion of the links. Depending on the level of flexibility and damping involved, the locking triggers a large-scale “slow” motion that may have either oscillatory or circular (clockwise or counterclockwise) characters. The links will stop at some resting configuration only at certain “critical” values of damping. The set of “critical dampings” seems to be infinite, though only two degrees-of-freedom are used to model the system. Governing equations for these phenomena are derived and discussed in Part II of this paper.

Copyright © 1998 by The American Society of Mechanical Engineers
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