## 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 319

In order'to ensure that UFEM

stiffness and mass matrices are expressed as sum of changes in structural

components ( 5 , 6 , 25 ) where ( Q ' } is a transformed displacement vector .

In order'to ensure that UFEM

**represents**a real structure , changes in the globalstiffness and mass matrices are expressed as sum of changes in structural

components ( 5 , 6 , 25 ) where ( Q ' } is a transformed displacement vector .

Page 329

The upper lighter section

and associated fluid As discussed previously , a correctly coupled boundary and

...

The upper lighter section

**represents**the ice canopy while the lower darker area**represents**the fluid . ... 3 Section of typical finite element mesh**representing**iceand associated fluid As discussed previously , a correctly coupled boundary and

...

Page 501

Here El

the weight of the riser plus content , minus the weight of the displaced water

column . T is the effective tension of the riser , i.e. the axial force in the riser wall ...

Here El

**represents**bending stiffness and w ( z ) , the " wet weight " , is equal tothe weight of the riser plus content , minus the weight of the displaced water

column . T is the effective tension of the riser , i.e. the axial force in the riser wall ...

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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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### Common terms and phrases

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