## Proceedings of the ... International Conference on Offshore Mechanics and Arctic EngineeringAmerican Society of Mechanical Engineers, 1994 - Arctic regions |

### From inside the book

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Page 46

The

complex quadratic transfer function for the

force, F"(t), is FHt) = H{fitfs) exp(-j(2n (fi+fj) C+e^+Cj)] (3) where Hffj,^) is the ...

The

**drift force**time history, FL(t), is exp[-j(2n(frfj) t+€J -€_,)] (2) where L(fwf,) is thecomplex quadratic transfer function for the

**drift force**. Similarly, the sum frequencyforce, F"(t), is FHt) = H{fitfs) exp(-j(2n (fi+fj) C+e^+Cj)] (3) where Hffj,^) is the ...

Page 95

enough to obtain the steady

20 m and of draft 6 m is exposed to regular incident waves with wave period T=

8.0 seconds and various wave amplitudes ao=0.15 - 0.6 m as shown in Fig. 4.

enough to obtain the steady

**drift forces**. A rectangular moored body of beam B=20 m and of draft 6 m is exposed to regular incident waves with wave period T=

8.0 seconds and various wave amplitudes ao=0.15 - 0.6 m as shown in Fig. 4.

Page 96

It should be noted that the slow

larger than that for K22=40 tf/m because the difference frequency component in

sway

mode.

It should be noted that the slow

**drift**oscillations for K22=0 ft/m are obviouslylarger than that for K22=40 tf/m because the difference frequency component in

sway

**force**as shown in Fig. 12 is tuned by the resonance frequency in swayingmode.

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### Contents

OCEAN WAVES AND ENERGY | 1 |

HYDRODYNAMIC FORCES | 45 |

COMPUTATIONAL HYDRODYNAMICS | 91 |

Copyright | |

7 other sections not shown

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### Common terms and phrases

added mass amplitude analysis boundary conditions buoy calculated Circular Cylinder compliant tower components correlation length curve deck diameter diffraction drag coefficient drag force drift force dynamic effects energy Engineering envelope equation experimental Figure fluid Fluid Mechanics free surface heave Hilbert transform horizontal hydrodynamic hydrodynamic force incident wave increase installation interaction irregular waves lift coefficient lift force linear load control lock-in matrix maxima maximum measured method model tests modes mooring line nonlinear obtained Ocean OMAE oscillating cylinder parameters peak phase pipe platform predicted present pressure problem quadratic Quickwave random ratio Reynolds number riser seastate second-order shear shedding frequency shown simulation solution spectral spectrum stationary cylinder stiffeners Strouhal Strouhal number transfer function transverse turbulence uniform flow values vector velocity potential vertical vibration vortex shedding water depth wave force wave frequency wave height wave power wind