Showing papers in "Ocean Engineering in 2003"

TL;DR: In this paper, a consistent finite element is proposed to model the hydrodynamic response of net panels to environmental loading, which can reproduce the drag, buoyancy, inertial and elastic forces exerted on the netting by current and waves.

TL;DR: In this paper, a coupled finite element (FEM) and boundary element (BEM) method is developed to analyse the nonlinear interaction between bodies and water waves, where the former is used away from the body while the latter is used in a region near body.

TL;DR: In this article, the authors compare three commonly used parametric models of tropical cyclone winds and evaluate their application in the wave model WAM, which is applied to hindcast the wind and wave conditions of Hurricane Iniki, which directly hit the Hawaiian Island of Kauai in 1992.

TL;DR: In this article, an estimation-before-modeling (EBM) technique is used to estimate the hydrodynamic coefficients in a ship's state-space model, and an identifiable state space model is constructed in case that current effect is included and the maneuvering characteristics of a ship are analyzed.

TL;DR: In this article, a sliding mode fuzzy controller is used for motion control and line-of-sight guidance of an AUV-HM1 underwater vehicle, which is used to deal with model uncertainties, nonlinearities of vehicle dynamics, and environmental disturbances caused by ocean currents and waves.

TL;DR: In this paper, a 3D numerical model of a fixed Oscillating Water Column system (OWC) is presented and validated by solving the steady-state potential flow boundary value problem due to regular wave interaction with the OWC by first order mixed distribution panel method.

TL;DR: In this paper, the authors describe the development of a numerical model that accurately captures the dynamics of mine-hunting systems using a lumped mass approximation for the towcable and couple this model to non-linear numerical models of an autonomous surface vehicle and an actively controlled towfish.

TL;DR: The RNN proved to be a robust and accurate tool for manoeuvring simulation for surface ships and was used to test the capabilities of artificial neural networks in manoeuvering simulation of ships.

TL;DR: In this article, the authors describe a model package that simulates coastal flooding resulting from storm surge and waves generated by tropical cyclones, which is applied to hindcast the coastal flooding caused by Hurricanes Iwa and Iniki, which hit the Hawaiian Island of Kauai in 1982 and 1992.

TL;DR: In this article, a modal separation and regression analysis was used to estimate the forces and torques exerted by internal soliton on cylindrical piles, and the results showed that the higher number of modes retained in the calculation, the better the estimation of velocity profile tits the observational one.

TL;DR: In this paper, the effects of wave non-linearity on the wave-induced seabed response with dynamic soil behavior were examined, and the applicable range of dynamic and quasi-static approximations was also clarified for engineering practice.

TL;DR: In this paper, the results of a laboratory experimental program aimed at better understanding the scour around and burial of heavy cylindrical objects under oscillating flow on a sandy bed are described.

TL;DR: In this article, a series of monotonic and cyclic triaxial shear tests were carried out to study the influence of the strain effect and load cycles on the undrained shear strength of a cemented marine clay from the East coast of India.

TL;DR: In this article, a Regional Neural Network for Water Level (RNN_WL) was developed to predict long-term water levels in a coastal inlet, based on the input of data in a remote NOAA station in the region.

TL;DR: In this paper, it is shown that it is possible to obtain an impressive natural resonance between random wind-generated waves and a new kind of absorber beneath the sea level, which should enable us to defend coasts with a very low environmental impact and to use breakwaters for converting large quantities of wave energy into electric power.

TL;DR: The networks were trained by combining the existing deterministic relations with a random component and validated with the help of fresh laboratory observations to confirm usefulness of the neural network approach for this application.

TL;DR: In this article, an experimental study showed that an increase in the inlet air temperature caused an increase of brake specific fuel consumption (BSFC), carbon monoxide, carbon dioxide emission, and exhaust gas temperature, while decreasing the excess air, oxygen and nitrogen oxide emission concentrations.

TL;DR: In this article, the response analysis is performed in time domain to solve the dynamic behavior of the moored Spar platform as an integrated system using the iterative incremental Newmark's Beta approach.

TL;DR: In this article, the spectral wave model was used to hindcast the surface waves in the Baltic Sea during a 12-month period, and the model results showed a strong temporal and spatial variation in the wave field due to the physical dimensions of the different basins and the predominant wind field.

TL;DR: In this article, the authors developed the complete second-order wavemaker theory for the generation of multidirectional waves in a semi-infinite basin, including superharmonics and subharmonics.

TL;DR: In this article, a nonlinear approach has been tried to predict the roll response of a vessel in a beam sea and various representations of damping and restoring terms found in the literature are investigated.

TL;DR: In this paper, a three-dimensional numerical model is developed to investigate the problem of wave-current-body interaction, and the model solves the spatially averaged Navier-Stokes equations.

TL;DR: A series of hydraulic model tests has been carried out in a glass wave flume to investigate the influences of wave height, wave period, wave steepness, surf similarity parameter, roughness, layer thickness and porosity on wave run-up and overtopping of 1:2 sloped impermeable and permeable breakwaters fronted by a 1:10 gentle, smooth beach slope as mentioned in this paper.

TL;DR: In this article, it is shown that negative cavitation number is favorable to achieve a negative number in the developed cavitating flow under the vessel's bottom in order to generate additional lift Cavities, formed in the flow, have limiting parameters that are affected by propulsion and lift-enhancing devices.

TL;DR: In this article, a sensitivity analysis is performed to study the effects of the operational depths and the hull shell geometry parameter, the length-to-diameter ratio (L/D), on the optimal design of filament-wound multilayer-sandwich submersible pressure hulls with graphite/epoxy, glass-epoxy and boron/epoxide composite facings.

TL;DR: In this paper, a multivariable controller is developed to stabilize ocean surface ships without a sway actuator on a linear course and to reduce roll and pitch simultaneously, and the controller adapts to unknown parameters of the ship and constant environmental disturbances induced by wave, ocean current and wind.

TL;DR: In this article, a nonlinear dynamic analysis of a multipoint slack moored buoy is performed under the action of first and second order wave forces, which is caused by the geometric nonlinearity of the mooring lines.

TL;DR: In this paper, a reverse system identification approach is presented that utilizes generalized coordinate and force functions to recover the value of the key system parameters for each mode of vibration for a single marine riser with general damping-restoring types of nonlinearities subject to random wave excitation.

TL;DR: In this paper, the wave-induced instability of untrenched pipeline on sandy seabed is a ''wave-soil-pipeline'' coupling dynamic problem, and different linear relationships between Froude number (Fr) and non-dimensional pipeline weight (G) are obtained for two constraint conditions.