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On combination formulae for the extremes of wave-frequency and low-frequency responses

Yungang Liu (Institutionen för vattenbyggnad) ; Lars Bergdahl (Institutionen för vattenbyggnad)
Applied Ocean Research (0141-1187). Vol. 21 (1999), 1, p. 41-46.
[Artikel, refereegranskad vetenskaplig]

One special feature in moored floating platforms is the co-existence of the first-order wave-frequency (WF) response and the second-order low-frequency (LF) resonant response. Non-linear properties inherent in moored floating platforms cause the platform motions and mooring cable tensions to be non-Gaussian (not normal) distributed, both for the WF and for the LF components. As the LF and the WF components are not independent, it is important and necessary to find a simple, reliable and yet physically sound technique to estimate their combination. In this paper, on the basis of some model test results, different combination formulae are compared and a formula considering WF and LF correlation effects is suggested. A simple approach is also proposed to estimate the correlation factor.

Nyckelord: non-Gaussian process, wave frequency, low frequency, combination



Denna post skapades 2006-09-28. Senast ändrad 2013-06-04.
CPL Pubid: 2143

 

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Institutioner (Chalmers)

Institutionen för vattenbyggnad (1946-2000)

Ämnesområden

Samhällsbyggnadsteknik

Chalmers infrastruktur