Showing papers in "Ocean Engineering in 1979"

TL;DR: In this paper, a method for computing the mean wave drifting forces on a free floating structure in regular waves is extended to include low frequency oscillatory components which arise when the structure is floating in regular wave groups consisting of two regular waves with small difference frequency.

TL;DR: In this article, the influence of the sea bottom on ship motions and sea loads is examined, and it is described how to calculate the vertical motions and loads for a ship with non-zero forward speed in regular waves by use of sttip theory and fluid finite element method.

TL;DR: In this article, the authors identify and describe all actual or potential underwater inspection requirements (national and international) for fixed concrete and steel structures promulgated by the governments of offshore oil and gas producing countries and by the offshore operators themselves, and assess the state-of-the-art in underwater non-destructive testing/monitoring/inspection of offshore structures.

TL;DR: In this paper, the fundamental frequency of transverse vibration of the orthotropic structural element is determined by expanding the displacement amplitude function in terms of simple polynomial coordinate functions which satisfy identically the essential boundary conditions and approximately some of the natural edge requirements.

TL;DR: The use of the Reynolds number as the only correlating factor for drag force measurements may be inadequate in circumstances involving highly turbulent flows as mentioned in this paper, and the results of previous investigations relating to the effects of turbulence scale and intensity are examined

TL;DR: In this paper, an investigation of available data on the saturation state of seawater with respect to calcium carbonate and its possible significance for scale formation on Ocean Thermal Energy Conversion (OTEC) heat exchangers is made.

TL;DR: In this article, the performance characteristics of possible anchors for the Ocean Thermal Energy Conversion power plant (OTEC) are presented and some constraints on the OTEC mooring design resulting from the analysis of several anchoring systems are alluded to.

TL;DR: In this article, asymptotic and total stability of the non-linear free and forced pure rolling motions of a ship is investigated by generating a time-invariant Lyapunov function.

TL;DR: In this paper, a technique has been presented that allows for the estimation of the wind driven current or transport due to an arbitrary, time dependent wind through simple calculations, where the limitations involved are primarily those inherent in an Ekman force balance.

TL;DR: The concept of using electrochemical gas concentration cells to convert the mechanical potential energy of ocean waves to electricity using a taut-moored buoy is analyzed in this article, where several idealized embodiments are discussed and one of these is shown to have particular merit.

TL;DR: In this paper, the authors considered the significance of loads and moments due to wind and currents on offshore gravity platforms and proposed a suite of computer programs F-WAVE which analyse and design gravity platforms under static and dynamic sea load conditions.

TL;DR: In this article, a simple operationally oriented model of surface wind-driven currents is presented in which Lagrangian surface drift is assumed to be composed of a linear combination of a wave-induced Stokes drift plus a winddriven Ekman drift.

TL;DR: In this paper, the propagation of surge waves in open channels is studied and the governing equations are derived for an arbitrary cross-section and specific solutions are given for rectangular, parabolic, and trapezoidal cross-sections.

TL;DR: In this article, the propulsive efficiency of marine vehicles has been investigated from the point of view of the effect of restricted waters of the propulsion characteristics of the vehicles on their performance.

TL;DR: In this paper, a fast diagrammatic method to determine the geometric part of a ship's stability lever, the MS, is described, and diagrams of the contribution to the stability of erections: deck houses and superstructures.