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RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering

Subharmonic and Chaotic Motions of Compliant Offshore Structures and Articulated Mooring Towers

[+] Author and Article Information
J. M. T. Thompson, A. R. Bokaian, R. Ghaffari

London Centre for Marine Technology, Department of Civil Engineering, University College London, London, U.K.

J. Energy Resour. Technol 106(2), 191-198 (Jun 01, 1984) (8 pages) doi:10.1115/1.3231037 History: Received June 29, 1983; Revised October 07, 1983; Online October 22, 2009

Abstract

Compliant offshore structures have complex nonlinear dynamics. Subharmonic resonances can co-exist with small fundamental motions. To prevent a simulation missing an entire subharmonic peak, a comprehensive set of initial conditions must be explored. Chaotic nonperiodic motions can also arise in deterministic problems. These are extremely sensitive to starting conditions and require a statistical description. Chaotic responses and their adjacent subharmonics of arbitrarily high order mean that the duration of digital, analogue and laboratory simulations must be chosen with considerable care. Resonances of articulated mooring towers, encountered in tank tests, are used to illustrate these general concepts.

Copyright © 1984 by ASME
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