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Data analysis of an oscillating flapping wing is conducted for developing a transfer function model especially for heave force data series from the CFD environment for different geometries of flapping wings. The wing experiences a combination of vertical and angular oscillatory motion, while travelling at constant forward speed. The vertical motion is induced by the random motion of the ship in waves,...
An overview of flow simulations for the offshore wind industry is given. The analyses concern blades, turbines and whole wind power farms. Both aerodynamic simulations and hydrodynamic simulations are considered. Applications are taken from the experience of DNV GL Group.
The aim of this work is to present a numerical approach to solve accurately the coupled dynamic interaction between a floating body and the incoming wave. This floating body is a Wave Energy Converter (WEC) based on the use of gyroscope in order to extract energy from the slope of the sea waves. The hydrodynamic model is based on a Computational Fluid Dynamic (CFD) approach suited to simulate incompressible...
This work describes a system for off-shore power generation based on a Wave Energy Converter (WEC) called Seaspoon coupled to a microturbine. The paper reports the performance of the WEC under the action of regular sinusoidal waves investigated with numerical fluid dynamic simulation; such a converter can be coupled to an air microturbine-driven microgenerator into a system for off-shore energy generation...
ROV trencher is a kind of ROV which trench the sea floor using specifically designed water jetting tool. For this trencher, maximization of trenching depth and trenching speed (or progress rate) are two of key performance, both of which directly depend on the proper design of jetting arm system. In this paper, we discuss some of optimal design considerations for water jetting arm system through laboratory...
The next generation of Autonomous Surface Vessels (ASV) will be optimized for optimum performance at sea. The design of an innovative unconventional SWATH-ASV family, patented by the author and under further investigation at the MIT innovative Ship design lab is described in its main features. The new unconventional design of the hull is the key to superior resistance, powering and seakeeping performance...
This work takes place in the framework of the EU FP7 funded ARROWS project. In ARROWS project, low-cost autonomous underwater vehicle technologies are adapted and developed to significantly reduce the costs of underwater archaeological operations, covering the full extent of archaeological campaign. The project aims to deal with underwater mapping, diagnosis and cleaning tasks. This paper, specifically,...
Deep inside the ocean, the earth magnetic signal is one of the merely existing information that tells the heading of robots with very good cost efficiency. Therefore, this paper focuses on the AUV (Autonomous Underwater Vehicle) heading control problem using only one magnetic compass as feedback sensor. In this application, we address AUV modeling and control issues simultaneously. Because of quadratic...
This paper presents an approach of analyzing the sawtooth and spiraling equilibrium motion of underwater gliders which is actuated by a single internal movable and rotatable mass. The equations are derived and then solved through a recursive algorithm. Hydrodynamic coefficients of the underwater glider are calculated by computational fluid dynamics (CFD) software packages. The motions of the underwater...
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