Showing papers in "Ocean Engineering in 1986"

TL;DR: In this paper, the authors present a review of the data limitations, statistical assumptions, distributions, fitting methods, and statistical tests used to determine confidence intervals and goodness of fit for offshore structures.

TL;DR: A survey of diffraction/radiation analyses has been performed on behalf of the International Ship and Offshore Structures Congress, Committee I.2. as mentioned in this paper, with data from 17 organizations plotted in a common format.

TL;DR: This work examines previous calibration studies and after joining the old with more recent data sets a reanalysis of the complete data sets is performed leading to updated regression equations.

TL;DR: In this paper, the wave steepness and asymmetry from zero-downcross analysis of wave data obtained from full scale measurements in deep water on the Norwegian continental shelf in 58 time series are presented.

TL;DR: In this article, a macroelement method is proposed for the complete linear hydromechanic analysis of arbitrarily shaped bodies of revolution with vertical axis can be carried out, based on discretization of the flow field around the structure by means of ring-shaped macroelements, the velocity potential in each element being approximated with Fourier series.

TL;DR: In this article, the free motions in waves of a submerged vehicle with a spherical hull from but different metacentric heights are analyzed by considering the submerged vehicle as a neutrally buoyant sphere.

TL;DR: In this article, the 2nd-order wave heights and the overall horizontal asymmetries of the wave train were calculated for a 1st-order PM and a Jonswap spectrum.

TL;DR: In this paper, the boundary integral method is utilized to calculate the dynamic response of a surface-piercing, vertical, circular cylinder subjected to high-frequency horizontal ground excitation, where the axisymmetry of the structure is exploited by utilizing a new Green's function for linearly compressible fluid flow which is separable in the cylindrical polar coordinate system.

TL;DR: In this paper, the authors examined spectral, zero up-crossing and Tucker's methods of analysis for shallow water wave records and found that the wave height parameters H s and H _- are most reliable and consistent irrespective of the analysis technique.

TL;DR: In this article, a class of turbidity flows is investigated in which sediment is entrained sufficient to balance losses and an equilibrium flow is sustained, and the analytical models for predicting equilibrium flow configurations are surveyed.

TL;DR: In this article, a good correlation between observations and measurements was found indicating the feasibility of collecting further good data sets to provide an adequate calibration to the existing statistical compilations of wave data.

TL;DR: In this paper, the sea surface displacements measured by a wave staff, fixed in horizontal position, and a wave rider buoy, which moves with the water particles, are compared.

TL;DR: A detailed analysis of visually observed wave data off Madras, South East Coast of India reported for a period of ten years is presented and discussed in this article, where wave characteristics include wave height, wave period and its direction with respect to North.

TL;DR: In this paper, a sensitivity analysis is presented to judge the importance of several parameters influencing scour effects on piles of offshore foundations and the decrease of the pile reliability due to scour is also studied by applying the first-order reliability method.

TL;DR: In this article, the authors present a heating system for divers which is totally powered by the compressed gas used in supporting their lives underwater, which is used to generate a heating effect by expanding the gas in an optimally designed vortex tube.

TL;DR: In this article, a hindcast study of extreme wave conditions in the Tyrrhenian Sea is described, including the identification and the statistics of the weather patterns in the area, the choice of the storms to be hindcasted, the wind and wave models, a check of the best extremal distributions for the estimate of the extreme values probability, and the estimation of the accuracy of the final results.

TL;DR: In this article, an attempt is made to present an automated analysis of laterally loaded piles using subgrade reaction theory and the P - δ curves governing the soil properties, and the finite difference method is applied in establishing the governing equations.

TL;DR: In this article, a variety of different lateral mixing models have been employed in the equation of motion for determining wave-induced longshore currents, including models which vary monotonically with horizontal distance offshore and models which change form at the breaker line.

TL;DR: In this paper, a method was developed to calculate hydrodynamic forces up to the third order, acting on axisymmetric bodies in an oscillatory heaving motion, with the knowledge of first and second-order potential functions.

TL;DR: In this article, a scale model of a prototype hydrophone array has been designed, fabricated, and tested in a speed range of 1.0 to 4.5 m/sec.

TL;DR: In this article, the spray thickness of a wedge-shaped hull is calculated by making assumptions about the spray path angle to the horizontal, which is found to predict accurately the spray angles for rectangular flat planing plates.

TL;DR: In this paper, a new class of vortex tube-assisted hyperbaric chambers is presented where such temperatures are reduced passively without the need for external power source, where the vortex tube is utilized as a means for generating the necessary cooling effect as the gases flow from their storage tanks into the chamber.

TL;DR: In this paper, a collision tolerant pile structure (CTPS) for deploying navigation aids was developed having the ability to sustain collision by barge traffic, which consists of the aid itself mounted at the top of a pile which is hinged at the mudline.

TL;DR: In this article, a bevelled block submerged breakwater with 1 on 1.67 seaward slope and a vertical shoreward face is examined with laboratory tests, and the Goda's method was found to be the simplest and most suitable in the case of the shore protecting submerged breakwaters.

TL;DR: In this paper, the authors deal with the determination of the natural frequencies of a pipeline in a free span, and the basic problem has a strong bearing on the effect of the loading on the pipelines.

TL;DR: In this paper, the authors present an exact solution of the problem of free nonlinear rolling or pitching motion of a submerged vehicle, and they show that the non-dimensional frequency-amplitude relationship of free uncoupled roll or pitch is universal, i.e. the single curve describes the behavior of any vehicle.

TL;DR: In this article, the authors deal with the determination of an approximate fundamental frequency equation for a rectangular plate with two edges (y = 0, b ) elastically restrained against rotation while the edges x=0, a are free but internal supports parallel to the free edges are present in the structural system.

TL;DR: In this article, the hydrodynamic forces of a single semisubmerged circular cylinder containing a concentric cylindrical hole constrained to move in a water domain of finite depth were investigated.

TL;DR: In this article, an analytical method to determine an operability index for a marine vehicle when its geometric characteristics, the geographical area in which the vessel is supposed to operate, and the limiting criteria for operations are known is described.

TL;DR: In this article, a self-heated first stage (SHFS) regulator for underwater divers with built-in selfheating capabilities is presented. And the thermal characteristics of this regulator are monitored and compared with those of a conventional regulator under different simulated dive temperatures, breathing frequencies and also under free flow conditions.