A Geometrical Approach Assessing Instability Trends for Galloping

[+] Author and Article Information
P. Yu, N. Popplewell, A. H. Shah

Faculty of Engineering, The University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

J. Appl. Mech 58(3), 784-791 (Sep 01, 1991) (8 pages) doi:10.1115/1.2897264 History: Received September 28, 1989; Revised May 09, 1990; Online March 31, 2008


Although the galloping of an iced electrical conductor has been considered by many researchers, no special attention has been given to the galloping’s sensitivity to alternations in the system’s parameters. A geometrical method is presented in this paper to describe these instability trends and to provide compromises for controlling an instability. The conventional but uncontrollable parameter of the wind speed is chosen as the basis for obtaining the critical conditions under which bifurcations occur for a representative two degrees-of-freedom model. Variations in these critical conditions are found in a two-dimensional parameter space in order to determine the trends for the initiation of galloping as well as to evaluate the stability of the ensuring periodic vibrations.

Copyright © 1991 by The American Society of Mechanical Engineers
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