Subharmonic and chaotic motions of compliant offshore structures and articulated mooring towers

Journal Article · Fri Jun 01 00:00:00 EDT 1984 · J. Energy Resour. Technol.; (United States)

DOI:https://doi.org/10.1115/1.3231037· OSTI ID:6486672

Thompson, J M.T.; Bokaian, A R; Ghaffari, R

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.

• Research Organization: London Centre for Marine Technology, Department of Civil Engineering, University College London, London
• OSTI ID: 6486672
• Journal Information: J. Energy Resour. Technol.; (United States), Journal Name: J. Energy Resour. Technol.; (United States) Vol. 106:2; ISSN JERTD
• Country of Publication: United States
• Language: English

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