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|Type:||Artigo de evento|
|Title:||Behaviour Of A Floating Platform With Marine Riser In Directional Waves|
|Author:||Morooka Celso K.|
Yokoo Irineu H.
|Abstract:||In this paper, the directional analysis is applied to study the behaviour of a floating platform connected to a deep water riser. Initially, numerical simulations of the sea surface elevations are carried out from wave spectra with directional spreading. The wave elevations are obtained for fixed positions in space which represent wave sensors, and they are analysed by the Maximum Likelihood Method (MLM) producing estimates of the directional wave spectra. The coupled system (platform/riser) is modelled and solved for a range of frequencies and directions of wave incidence, producing directional Response Amplitude Operators (RAO) for the six degrees of motions of the platform and for the riser bending stresses. With the platform motion RAO and the estimated wave spectra, directional response spectra are obtained and short-term prediction, in frequency domain, is performed to evaluate the first order motions of the platform in directional waves. The influences of the spreading parameter for head sea conditions and of the principal direction of wave incidence are investigated. Finally, short-term analysis is performed to evaluate the effects of wave spreading and of the wave principal direction on the total bending stresses of the riser.|
|Editor:||Publ by Int Soc of Offshore and Polar Engineerns (ISOPE), Golden, CO, United States|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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