## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volumes 1-2American Society of Mechanical Engineers, 1991 - Arctic regions |

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Page 14

Therefore one criterion to identify the existance of the two

the minimum spectral ordinate that occurs ... However , if a

along several frequencies which gradually increase and then decrease or vice ...

Therefore one criterion to identify the existance of the two

**peaks**, is to insure thatthe minimum spectral ordinate that occurs ... However , if a

**peak**is developedalong several frequencies which gradually increase and then decrease or vice ...

Page 17

occurrence of sea states in Figueira da Foz ( 198189 ) for the data grouped in

classes of 0.5ın significant wave height and Is of ' nean zero uperossing period .

**Peak**Period ( 3 ) 0 . 12 . 16 . Zero - upcrossing period ( s ) Fig . 1c - Probability ofoccurrence of sea states in Figueira da Foz ( 198189 ) for the data grouped in

classes of 0.5ın significant wave height and Is of ' nean zero uperossing period .

Page 50

Accordingly , for the Northern North Sea , the distribution of the largest t - hour

event during L years becomes ; h FHmo , ( h ) = ( 1 - exp ( - ( - ) ) ) 9267 ( 7 ) The

conditional mean value and standard deviation for the spectral

given ...

Accordingly , for the Northern North Sea , the distribution of the largest t - hour

event during L years becomes ; h FHmo , ( h ) = ( 1 - exp ( - ( - ) ) ) 9267 ( 7 ) The

conditional mean value and standard deviation for the spectral

**peak**period isgiven ...

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### Contents

CONTENTS | 131 |

High Frequency Hydrodynamic Damping of a TLP | 147 |

A Comparison of Results | 153 |

Copyright | |

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acceleration added amplitude analysis angle applied approach approximately assumed body boundary cable calculated coefficients compared components computed considered constant coordinate corresponding cylinder damping depth determined developed diffraction direction displacement distribution domain drag drift dynamic effect element Engineering equation estimated experimental experiments expressed field Figure floating flow fluid force free surface frequency function given height hydrodynamic included increase integral length lift force linear load mass maximum mean measured Mechanics method mode mooring motion natural nonlinear obtained Offshore operation oscillation period phase pile platform position potential predicted present pressure problem production range ratio relative represents respectively response second-order separation ship shown shows simulation solution stiffness structure surface surge Table Technology tension tests theory values velocity vertical vessel wave