## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 1; Volume 7, Part 1American Society of Mechanical Engineers, 1988 - Arctic regions |

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Page 305

A method is proposed to extract the mass , damping , and stiffness

structures from the estimated modal ... developing models of structures by using

either modal parameters obtained from modal survey : Damping

A method is proposed to extract the mass , damping , and stiffness

**matrices**ofstructures from the estimated modal ... developing models of structures by using

either modal parameters obtained from modal survey : Damping

**matrix**tests or ...Page 307

Let the ith eigenvalue and corresponding eigen vector of

) be given respectively as 1 . . . . . . . Pi = p + jPI y = y + ja an - 2 ( n - 1 , a , , 1

where x and x ' are the real and imaginary parts of x respectively . It can be

shown ...

Let the ith eigenvalue and corresponding eigen vector of

**matrix**A of equation ( 4) be given respectively as 1 . . . . . . . Pi = p + jPI y = y + ja an - 2 ( n - 1 , a , , 1

where x and x ' are the real and imaginary parts of x respectively . It can be

shown ...

Page 308

19 P = diag ( P2 , P2 , . . . , Pg ? Using this definition of the complex modal

equations ( 18 ) can be written ... We present in next sections a method to

estimate the M , C , and K

Equation ...

19 P = diag ( P2 , P2 , . . . , Pg ? Using this definition of the complex modal

**matrix**,equations ( 18 ) can be written ... We present in next sections a method to

estimate the M , C , and K

**matrices**from these estimated modal parameters .Equation ...

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### Contents

Early Production Systems in the North | 31 |

Application of System Identification Technique to Damage Detection and Location in Offshore Platform | 77 |

Vibration Testing and Dynamic Analysis of Offshore Platform Models | 85 |

Copyright | |

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analysis angle applied assumed axial bending cable calculated coefficient components Conference connection considered cost curve depth determined developed diameter direction displacement distribution dynamic effect element energy Engineering equation equipment estimated extreme factor fatigue field Figure flow force frequency function given important included increase installation International length limit linear load lower Marine mass material matrix maximum mean measured Mechanics method mode mooring motion natural normal obtained Offshore operation parameters performed period pile pipe platform position predicted presented pressure problem production range ratio response riser rope shear shown shows significant soil solution static stiffness strength stress structure surface Table Technology tension tower unit vane vertical vessel wave weight wire