... structure reservoir surveillance subsea system production control jacket model industry practice equation upstream oil & gas regular wave santo coefficient standard morison equation offshore technology conference blockage production monitoring university Taylor , P. H...

... directly affecting fatigue performance can be over- simplified. These key issues include: 1. Considerable over simplification of global loads such as the use of max./min. curvature values that have been derived from regular wave analyses. Irregular OTC 18303 New Industry Guidelines for Fatigue Analysis...

... linearized models. A frequency decomposition of the wave forces on a structure indicates that even for a regular wave, higher harmonic components are present due to non-linearities. Therefore, SDOF method severely overestimates the inertia forces near the natural period, while possibly underestimating...

... as moments about the transverse axis. The model was subjected to both regular waves and wave groupsselected from irregular wave spectra. Wave spectra were modelled using a deterministic approach which matched thespectrum shape. The measured waves were scanned to identify groups containing waves with crest...

..., the effect of current was investigated by towing the model with the carriage through the Seakeeping Basin. The tests were carried out in regular and irregular waves. The regular waves had a period of 12.9s or 11.2s, which resulted in a deep water wave length equal to the ship length (ML = 1.0) and three...

... for very steep waves will be For static regular wave analysis, the procedure for suggested. References are also made to use of calculation of wave plus current forces is shown in apparent regular waves simulating measured Fig. 1 @lg. C.3.2-1 of Ref (l Relating to wave waves traces in irregular seas...

... of this additional force reduction depends upon the type of wave, e.g., a single large wave or regular waves. A comparison of the new regular wave model and published force measurements on a scale-model structure shows excellent agreement for a wide range of wave heights and current speeds. Large ocean waves do...

... is a two-peak broad-banded wave train. The waves in this study were limited to two-dimensions, but the extension of the study to include the directional waves is planned for the near future. NUMERICAL SCHEME Reaul ar Waves A regular wave is steady in the coordinates moving at its phase velocity (C...

... is presented, ABSTRACT This paper describes random and regular wave responses of compliant and stiff bottom-founded structures in a water depth range of 900 to 1500ft for the Gulf of Mexico (GOfvf). Design force levels based on conventional design wave force models are shown to be generally lower than...

... of elementary results to bay and leg results and the comparison of the composed results with measured results to check on interactions. drag coefficient post-critical flow condition regular wave chord flow condition subsea system force sleeve upstream oil & gas random wave model 1 jack-up...

... Abstract A model test programme is described in which the hydro-elastic vibrations of free spanning marine pipelines are studied. A large variety of environmental conditions are covered including steady currents, regular waves, irregular waves and combined steady currents and regular/irregular...

... of directional spreading of ir- regular waves, as it occurs in reality, on the loads and motions of floating offshore structures. See, for instance, ref. [1]. One method of obtaining such information is to conduct model tests in basins fitted with wave generators which have the capability to generate ir- regular...

... low frequency transfer function model test forward speed computation natural frequency coefficient regular wave tanker surge motion wave drift force surge direction frequency quadratic transfer function wave-current interaction effect moored tanker equation OTe 5631 Wave...

... of the dynamic hydraulic field which is induced in the soil around the structure by a regular wave on the sea surface. The distribution of the excess pore water pressure around the structure, the total forces acting on it, the possible instability or liquefaction of the sea bed are some of the relevant...

... wave period prediction american bureau time history heave response motion response test phase 1 subsea system wave height regular wave excitation correlation study drilling equipment rao model test mooring system test program frequency upstream oil & gas arctec offshore...

... of the response using second-order diffraction theory, and (d) assess importance of springing for design. The paper presents: (a) comparisons between measured and predicted regular-wave springing forces on the vertical cylinder, (b) comparisons References and illustrations at end of paper. - - ~ c c - ~. 333...

... on pipe strings, model tests, theoretical calculations and fatigue investigations were conducted. The results are described in this paper. sea condition wave height midstream oil & gas pipe string otc 5337 tow method regular wave nippon steel corp chengbei oil field offshore pipeline...

... to an abstract of nof more than 306 words, ABSTRACT Systematic laboratory measurements were performed to determine the steady drift of isolated, tabular ice-floe models in regular waves. A relatively simple expression for ~the steady wave-induced drift of two-dimen- sional floes of uniformthi'ckness and density...

... mooring lines. Tests were performed in regular waves and in irregu- lar seas using an IT'IC wave spectrum. Response Am- plitude Operators, (RAQ), were obtained fran the regular wave tests and compared to those calculated by the cross spectrum method fran the tests in ir- regular seas. In addition, RAO's...

... of the assumed general equation of mo- tion in surge direction of the vessel moored in ir- regular waves can be written as follows: (M+all(p2) + E . j=l,3,5 . {h&(l) + mlj21) + ~mKlj(k~2j(t-T)dT] =j n I . ! high frequency fluid reaction forces including speed effect + F(l)(O,O,t) +Xl (2) 3F(1)(0,0,t)+ ax~2) 1 1...