... includes different wave theories for determining the wave kinematics. The wave kinematics can be based on a deterministic wave maintaining its shape and crest height as it travels through the deck structure or it can be based on a stochastic irregular wave time series. The following kinematics modules can...

... platform shaft coefficient loading simulation procedure upstream oil & gas frequency otc 7420 irregular wave elevation time domain simulation knowledge management wave train diffraction effect time domain estimation time history amplitude @l 8 c OTC 7420 Time Domain...

... ABSTRACT The mean and low-frequency horizontal wave drift forces on 2 types of semi-submersible structures in regular and in irregular waves are determined from model tests and calculations. For the measurement of the low-frequency drift forces in irregular waves use is made of a special...

... tanker computation foil thrust horizontal motion amplitude fpso model test thrust upstream oil & gas head sea bow foil reduction offshore technology conference foil irregular wave mean thrust low-frequency motion drift force subsea system floating production system...

...aTe 6591 Response of Jackup Models to Irregular Waves Ping Liu, WW. Massie, J.G. Wolters, and J. Blaauwendraad, Delft U. of Technology Copyright 1991, Offshore Technology Conference This paper was presented at the 23rd Annual OTC in Houston, Texas, May 6-9, 1991. This paper was selected...

... surge decay test contribution irregular wave hull vessel motion equation offshoretechnologyconference mooring system upstream oil & gas friction surge low-frequency vessel motion wave drift low-frequency surge motion subsea system prediction wave drift force OTe 6660...

... ABSTRACT In this paper results of flexible riser model tests will be discussed and compared with results of time domain simulations for regular and irregular wave conditions with current. The model tests were performed at the Maritime Research Institute Netherlands (MARIN) with a large scale...

... of contributin d. In the present investigation we are concentrating on the mooring 1ine damping, and have 1imited ourselves to doing tests in irregular waves with the model moored in horizontal lines and springs, and then moored in the complete catenary system. Thus we are not in a posi- tion to 'make a very...

... understanding of the data and the most reliable input to the design. module subsidence spectrum 1 breakwater wall wave crest elevation crest elevation crest height tank irregular wave design value hydrodynamic model testing spectra 2 elevation module force deck force inner tank wave...

... of a moored floating structure generally occurs at very low natural frequencies in the horizontal plane. In irregular waves this resonance isexcited by the slowly varying second order drift force. In the last decade, estimation of the maximum excursions of the structure caused by this resonance phenomenon...

...~ responses in irregular waves. 307 RECENT DEVELOPMENTS IN THE ANALYSIS OF WAVE DRIFT FORCES, LOW FREQUENCY DAMPING AND RESPONSE decay OTC 5456 ax The only way in Which forward speed enters this analysis is through the change in wave encounter frequency Oe. We assume that the wave damping is due to changes...

... in the test, which are equivalent to I and 2 m at the site. A Study on the Installation of a Submerged Caisson in Deep Waters2 3-2. Irregular Wave: The relation between significant wave height (Hl/3) and period (Tl/3) in the ocean is given following equation in reference No. (3). !13Hl/3 < Tl/3 < /30Hl/3...

... computer simulation oscillation simulation contribution coefficient wave drift force upstream oil &amp; gas dynamic contribution drift force subsea system tanker equation low frequency moored vessel frequency total wave drift force formulation irregular wave resistance...

.... A nonlinear damping term based on the viscous drag force is also included in the motion analysis. The theory is extended from regular waves to apply to irregular waves. The test consisted of me!3.suring the six degrees of motion of the cylinder and the loads in the mooring lines in regular waves, wave groups...

... arising from the application of data from tests in steady current or re- gular waves to irregular waves or to the combination of waves and currents are avoid- ed. Hydrodynamic coefficients for drag, in- ertia, and lift forces appropriate for use in common industry formulas for pipelines are determined...

... of motion responses in regular waves are shown to be in good agreement with those of experiments carried out on a scale model of an actual crane barge. Calculation of motion responses of a few types of crane vessels in irregular waves and a trial estimation of workability thereof are presented to show...

... si system irregular wave impact force coefficient iceberg gravity spectrum dynamic response stiffness upstream oil &amp; gas rao frequency current force excitation cable subsea system loading motion response bergy bit impact newfoundland engineering drag force OTC 4425...

... linear springs fore and aft. The spring constants were varied in the test series and the springs were pretensioned so that they never went slack. The tests included the regular waves, wave groups and the irregular waves. The motions of the floating vessel and the loads in the mooring lines were measured...

... in regular and irregular waves. The mean vertical drift forces on a submerged horizontal cylinder obtained from model tests are also compared to results of computations. On the basis of these comparisons it is concluded that wave drift forces on semi-submersible type structures in conditions of waves without...

..., as well as sea-keeping tests for regular and irregular waves. In this series of tests, measurements were taken of wind coefficients of jackets, a relatively open type structure. Measurements also were taken of barge motion, jacket acceleration, and stresses in the tie-down braces. INTRODUCTION A barge...