Classical Vibration Analysis of Axially Moving Continua

[+] Author and Article Information
J. A. Wickert, C. D. Mote

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Appl. Mech 57(3), 738-744 (Sep 01, 1990) (7 pages) doi:10.1115/1.2897085 History: Received March 10, 1988; Revised March 23, 1989; Online March 31, 2008


Axially moving continua, such as high-speed magnetic tapes and band saw blades, experience a Coriolis acceleration component which renders such systems gyroscopic. The equations of motion for the traveling string and the traveling beam, the most common models of axially moving materials, are each cast in a canonical state space form defined by one symmetric and one skew-symmetric differential operator. When an equation of motion is represented in this form, the eigenfunctions are orthogonal with respect to each operator. Following this formulation, a classical vibration theory, comprised of a modal analysis and a Green’s function method, is derived for the class of axially moving continua. The analysis is applied to the representative traveling string and beam models, and exact closed-form expressions for their responses to arbitrary excitation and initial conditions result. In addition, the critical transport speed at which divergence instability occurs is determined explicitly from a sufficient condition for positive definiteness of the symmetric operator.

Copyright © 1990 by The American Society of Mechanical Engineers
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