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RESEARCH PAPERS: Offshore Mechanics

Numerical Modeling and Subharmonic Bifurcations of a Compliant Cylinder Exposed to Waves

[+] Author and Article Information
C. Y. Liaw

Department of Civil Engineering, National University of Singapore, Singapore, Singapore

J. Offshore Mech. Arct. Eng 111(1), 29-36 (Feb 01, 1989) (8 pages) doi:10.1115/1.3257135 History: Received January 01, 1987; Revised January 28, 1988; Online October 30, 2009

Abstract

The occurrence of subharmonic responses in compliant structures including nonlinear coupling between the wave force and the structural motion is studied using simplified models of a cylinder submerged in waves. In particular, the existence and sensitivity of subharmonics in the responses are evaluated by varying the mathematical model for wave force, the structure/wave frequency ratio, the drag coefficient and the wave height. It is concluded that subharmonic bifurcation of order 1/2 can be a common phenomenon in compliant structural systems, especially if the system has a low ratio of drag force to inertia force.

Copyright © 1989 by ASME
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