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RESEARCH PAPERS

The Loading-Frequency Relationship in Multiple Eigenvalue Problems

[+] Author and Article Information
K. Huseyin, J. Roorda

Solid Mechanics Division, University of Waterloo, Waterloo, Ontario, Canada

J. Appl. Mech 38(4), 1007-1011 (Dec 01, 1971) (5 pages) doi:10.1115/1.3408902 History: Received July 13, 1970; Online July 12, 2010

Abstract

The free vibrations of a linear conservative system with multiple loading parameters are studied, attention being restricted to pure eigenvalue problems. It is shown that the smallest frequency and external loading parameters of such a system constitute a strictly convex (synclastic) surface which cannot have convexity toward the origin of the “parameter space.” It is further proved that in the case of systems with one degree of freedom only, the surface takes the form of a plane. The practical implications of these results regarding the estimation of the frequencies and/or the stability boundary of the system are discussed. Thus it is observed that, on the basis of the established theorems, lower bounds to the frequencies at any stage of external loading and/or upper bounds to the stability boundary are readily obtainable. A two-degree-of-freedom illustrative example is discussed.

Copyright © 1971 by ASME
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