## 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 48

The natural frequency fn of the "cylinder-force- transducer" combinations in water

ranged from 3.6 Hz to 15 Hz, (i.e., f„ > 20 fw, with fw = 1/T, and fv/fn > 1.6 and fn >

Kfw, where fv is the vortex

The natural frequency fn of the "cylinder-force- transducer" combinations in water

ranged from 3.6 Hz to 15 Hz, (i.e., f„ > 20 fw, with fw = 1/T, and fv/fn > 1.6 and fn >

Kfw, where fv is the vortex

**shedding frequency**and K = UmaxT/D is the ...Page 190

In order to make a more rational prediction method, it is necessary to understand

the mechanism of the vortex

In order to make a more rational prediction method, it is necessary to understand

the mechanism of the vortex

**shedding**in a combined motion with two different**frequencies**. In this paper, the authors discuss the mechanism through flow ...Page 191

The difference of the drag forces by the

Figure 3 shows the simplified idea of the mechanism of the occurrence of the ...

The difference of the drag forces by the

**shedding**vortices in a cycle of the high-**frequency**oscillation yields the damping force for a low-**frequency**oscillation.Figure 3 shows the simplified idea of the mechanism of the occurrence of 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