Abstract The seakeeping performances in oblique wave conditions, such as ship motions and unsteady pressures on a hull, are getting more important, recently. These physical quantities used for estimating loads induced by waves evaluating the safety of ship. Thanks to evaluation various incident angles, rational design with sufficient less construction cost can be realized. Therefore, estimation...

In this paper, a new type of bottom trawl was designed for target fishing vessels to use in deep-water grounds. The trawl’s hydrodynamic performance investigated using numerical simulation and physical modeling methods, model based on the finite element method proposed estimating forces predicting performances. A series tests Tauti’s law were carried out towing tank explore assess applicability...

The goal of this study is to analyze the hydrodynamic behavior a Floating Wind Platform (FOWT) under regular wave conditions. analysis considers three degrees freedom: Heave, Pitch and Surge. was car-ried out using CFD (Computational Fluid Dynamics) tool, based on Navier-Stokes equations Finite Volume Method, results were compared against experimental tests performed at Wave/Towing Tank Univers...

Model-scale testing might suffer from blockage effects due to the finite dimensions of test section. Measurements must be corrected predict forces that would have been measured in unconfined conditions. Blockage corrections are well-established for streamlined and bluff bodies, while more data is needed develop bodies generate both high lift large wakes. In this work, towing tank water tunnel t...

This paper addresses a filtering problem that arises in the design of dynamic positioning systems for ships and offshore rigs subjected to the influence of sea waves. The dynamic model of the vessel captures explicitly the sea state as an uncertain parameter. The proposed adaptive wave filter borrows from maximum likelihood identification techniques. The general form of the logarithmic likeliho...

This paper describes and presents preliminary experimental results from a novel prototype energy scavenging system installed in a model 2m cylindrical Autonomous Underwater Vehicle (AUV). The system, which is based on control moment gyroscope (CMG) principles, utilises the gyroscopic response of a gimballed flywheel mounted within an AUV body to generate energy from the wave induced rotational ...

Bulk carriers have an important role in international maritime transport. In this paper, we carried out a numerical study on a model of bulk carrier vessel and calculated total resistance of the model. A model of a bulk carrier vessel with length of 2.76 m, breadth of 0.403 m and draught of 0.173 m was selected for numerical modeling. Numerical work was done by commercial CFD software ANSY...

Although catamaran configuration has been around for a longtime, it is only in the recent past that such hull forms have seen unprecedented growth in the high-speed ferry industry. One of the design challenges faced by naval architects is accurate prediction of the hydrodynamic characteristics of such vessels primarily in the areas of resistance, propulsion and seakeeping. Even though considera...

This paper describes a procedure to design robust controllers for Dynamic Positioning (DP) of ships and offshore rigs subjected to the influence of sea waves, currents, and wind loads using H∞ and mixed-μ techniques. To this effect, practical assumptions are exploited in order to obtain a linear design model with parametric uncertainties describing the dynamics of the vessel. Appropriate freque...

In this manuscript the development of a reduced order model for the analysis of long flexible cylinders in an offshore environment is proposed. In particular the focus is on the modelling of the vortex induced vibrations (VIV) and the aim is the development of a model capable of capturing both the in-line and cross-flow oscillations. The reduced order model is identified starting from the resul...