This site-wide search returns results for all documents and events in Tethys Engineering, prioritizing the best matches. Partial word matches are returned (e.g. "engineer" finds "engineering"), but every entered term must be found. If you don't find any results, try reducing the number of words entered or removing special characters. Filters to the right can help narrow your search. Tethys Engineering features an integrated search with other marine renewable energy databases in PRIMRE - click the buttons below "Showing Results for" to search other integrated databases.
Showing Results for
- Journal Article:
Zhang et al.
… and maximum power point tracking reference speed simultaneously for each turbine. The benefits of this novel control strategy is tested in a 4.5 MW three-turbine array model which is simulated in MATLAB/Simulink. Results show that in low flow velocity, the objective of stabilizing the fluctuation of loads is mainly achieved by adjusting generator speed. Conversely, the pitch controller …
- Conference Paper:
Moretti et al.
… This paper introduces a novel concept of Oscillating Wave Surge Converter, named Poly-Surge, provided with a Dielectric Elastomer … that employ rubber-like polymers to conceive deformable membrane capacitors capable of directly converting mechanical energy into electricity. In particular, a Parallelogram Shaped DEG is considered. In the paper, a description of the Poly-Surge is outlined and engineering considerations about the operation and control of …
- Conference Paper:
Bailey and Bryden
… effect that a mono-directional Power Take Off (PTO) has on the motions and power extraction of a Wave Energy Converter (WEC). A mono-directional damper is one where the resisting force only operates in one direction. The model comprises of a cylinder that is restrained to move in heave, reacting against an internal mass (also … mono-directional damper in parallel. This paper presents experimental results for a variety of different damping constants for mono-directional dampers which operate in both in expansion …
- Conference Paper:
Hodgins et al.
… aimed at reducing overall system mass in direct drive power takeoff applications. The design of a C-GEN generator requires the combination of electromagnetic, structural and thermal models. Two rotary prototypes of 15 & 20kW have been constructed and tested and the 15kW prototype has been fitted to a wind …
- Conference Paper:
Child and Venugopal
… A method is presented to analyse wave interactions with an array of simplified wave energy devices. The problem is formulated in terms of a group of heaving vertical circular cylinders floating in the ocean, whose motion is damped by their …
- Journal Article:
Bailey and Bryden
… energy converter. The power take-off uses the relative velocity between the main structure of the wave energy converter and an inertial referenced mass contained within its outer envelope. The power take-off consists of a linear spring and a quadratic damper. In this paper the mathematical principles behind a working time domain simulation of a non-linear power take-off as applied to a relative motion inertial referenced wave energy …
- Conference Paper:
Crozier et al.
… The high operation and maintenance (O&M) costs of wave energy converters are a large impediment to the technology’s development. Magnetic gears … suffer considerably less wear than mechanical alternatives. This paper presents the results of a dynamic analysis of a magnetically geared power take off system that has been designed for use with an oscillating …
- Conference Paper:
Burchell et al.
… for Wave Energy Convertor (WEC) designers and manufacturers is the efficient conversion of differing wave types into useful motion to produce electricity. The height, period and orientation of waves vary greatly as do their respective power levels [1]. In order to efficiently and cost effectively convert the kinetic energy of wave motion into electrical energy, a Power Take Off (PTO) system must be able to withstand …
- Book Chapter:
Salter
… This paper describes the work of the Edinburgh group on their duck. It reviews the techniques used to improve device productivity by controlling both power take-off and mounting-movement. It outlines the results of a test programme on long compliant spines and discusses costing methodology. Some future …
- Journal Article:
Potapenko et al.
… Two different concepts of wave energy converter coupled to the novel C-GEN linear generator have been studied numerically, including the evaluation of different buoy sizes. The first concept has a slack connection between the buoy and the … system with active rectification. The radiation forces originating from the oscillatory motion of the buoy have been approximated using the transfer function in the frequency domain and the …
- Journal Article:
Mueller and Baker
… stream devices, into electricity using direct drive electrical power take-off, without use of complex pneumatic, hydraulic or other mechanical linkages. In order to demonstrate the issues, two alternative topologies of linear electrical machines are investigated: the linear vernier hybrid permanent magnet … machine and the air-cored tubular permanent magnet machine. The electrical characteristics of these machines are described and compared in the context of mechanical integration. Potential …
- Conference Paper:
Reynolds et al.
… A novel control strategy is proposed for the control of two fixed pitch tidal turbines subjected to discrete flow speeds whilst interconnected in an … Expenditure (OPEX) due to offshore equipment failure. An added benefit is utilisation of a single shared export cable for both turbines, thereby reducing Capital Expenditure (CAPEX). By lowering the cost of installing and maintaining an array it is anticipated that the commercial viability of the …
- Journal Article:
Price et al.
… a commonly used performance indicator for a wave energy converter (WEC). The capture width of a linear WEC is shown to depend on two properties: the spectral power fraction (a property … on the sea state, and the monochromatic capture width, which is determined by the geometry of the WEC and the chosen power take off (PTO) coefficients. Each of these properties is examined in detail. Capture width is shown to be a measure of how well …
- Journal Article:
Pascal and Payne
… referred to as the ‘original study’ and whose prior reading is recommended to make the most of what follows), the authors explored the concept of sloped power take-off (PTO) for a free-floating wave energy converter (WEC) using linear potential flow theory. Part of the study focused on the optimization of four parameters: the mass reference m2, its vertical …
- Conference Paper:
Lucas et al.
… A modified version of the Edinburgh duck wave energy converter has been studied recently at the University of Edinburgh. …
- Conference Paper:
Keysan et al.
… C-GEN is a new topology of direct-drive permanent magnet generator being developed at University of Edinburgh. The main benefits are reduced overall system mass and ease of manufacturing, due to …
- Journal Article:
Moñino et al.
… used in Oscillating Water Column (OWC) devices for wave energy conversion. The purpose of this paper is to simulate the performance of an OWC turbine through the implementation of an Actuator Disk Model (ADM) in Fluent®. A set of different regular wave tests are developed …
- Conference Paper:
Clark et al.
… loads (DELs) for a PTO given three hull shapes (a cylinder, a sphere, and a barge), two sets of metocean conditions (from the center of the North Sea and off the west coast of Norway), and two float motions (heave and surge). Results indicate that hull geometry has a …
- Report:
Villate et al.
… today. Europe’s ocean energy resource is considerable. By 2050, ocean energy can deliver 100GW of capacity – equivalent to 10% of Europe’s electricity consumption today. Flexible and predictable, ocean energy complements … Europe’s technological advantage in ocean energy will ensure European companies a large share of a strong global market, as they do on offshore wind. With zero carbon emissions, ocean energy …
- Conference Paper:
Mueller et al.
… power take-off and the type used depends upon the wave energy device. A brief description of the different power take offs is provided to show how conventional rotary generators are used … and disadvantages are highlighted in the paper. Direct drive systems can overcome some of the disadvantages, but there are additional engineering challenges to overcome, in particular … size and mass. Current and more novel direct machine topologies are discussed in the context of these challenges. … 21723 …
Displaying 1 - 20 of 31