## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volumes 1-2American Society of Mechanical Engineers, 1990 - Offshore structures |

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Page 1

ABSTRACT Laboratory simulations of extreme random seas reveal that high

wave

of wave

ABSTRACT Laboratory simulations of extreme random seas reveal that high

wave

**crests**occur more frequently than ... resulting in a non-Rayleigh distributionof wave

**crest**and trough amplitudes based on the narrow-band assumption.Page 3

It was also found that the experimental probabilities of wave

given threshold were larger than those ... In order to explain these deviations

from linear theory, the fundamental assumptions of a Rayleigh distribution of

It was also found that the experimental probabilities of wave

**crests**exceeding agiven threshold were larger than those ... In order to explain these deviations

from linear theory, the fundamental assumptions of a Rayleigh distribution of

**crest**...Page 4

As a result, the derivation of p(r) is simpler and we find the probability density

function for wave

leading order This expression is comparable to results of other authors; however,

the ...

As a result, the derivation of p(r) is simpler and we find the probability density

function for wave

**crest**and trough amplitudes from (13) and (1) becomes toleading order This expression is comparable to results of other authors; however,

the ...

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added mass amplitude analysis array calculated circular cylinder component crest damping coefficient direction displacement distribution domain drag coefficient drag force drillship dynamic effect element equation estimated flexible riser floating flow fluid force coefficients forces acting foroe forward speed free surface heave horizontal hydrodynamic hydrodynamic forces incident wave integral irregular Kc number lift force linear load low-frequency low-frequency oscillation matrix maximum measured method mooring line motion nonlinear obtained Offshore Mechanics Offshore Structures Offshore Technology Conference oscillation oscillatory parameters pile plate prediction pressure problem ratio Rayleigh distribution regular waves response Reynolds number Sarpkaya seastates second-order semisubmersible ship shown in Figure simulation solution spectra spectrum surge tension transfer function transverse vector velocity potential vertical viscous vortex vortex shedding vortices water depth wave amplitude wave excitation wave force wave frequency wave height wave number wave period wave power