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- Journal Article:
Cruz and Salter
… This paper presents recent numerical studies conducted at The University of Edinburgh related to a modified version of the Edinburgh duck wave energy converter. Its purpose …
- Journal Article:
Salter
… laboratory techniques and results from the first work on wave energy, which led to the Edinburgh duck. It then describes some of the work done on later devices at Edinburgh University. Some of the results and ideas for power conversion, component testing, and …
- Conference Paper:
Caraher et al.
… useful technology for wave power applications. Typically, optimisation and comparison of these generators is based on an electromagnetic analysis with limited regard for the structural analysis. This paper presents a comparison of two alternative designs of the double-sided linear permanent magnet synchronous machine which includes structural and …
- Thesis:
Lin
… energy convertors are designed to use either vertical (heave) or horizontal (surge) movements of waves. But the frequency response of small heaving buoys and oscillating water column devices shows that they are too stiff and so … that a device that moved at some intermediate slope angle could have an intermediate value of hydrodynamic stiffness and so be resonant at a variable and desirable part of the wave …
- Conference Paper:
Garcia-Teruel et al.
… Wave Energy Converter structures are associated with the highest percentage share of LCOE costs, however, existing geometry optimization studies just consider maximization of power production and, in some cases, mass as a proxy for structural costs. How to include cost … discussed here. Two different methodologies - depending on the available information and goal of the study - are presented, and example cases for these are given. The results show the …
- Journal Article:
Pisetta et al.
… predictable renewable energy. New technology is needed to decrease the levelized cost of energy and to make this energy sector competitive in the energy market. A key area where … costs is mitigating the hydrodynamic load fluctuations, and thus increasing the fatigue life of the turbine. Here, we formulate a passive morphing blade concept that aims to mitigate the … elastically can suppress virtually all fluctuations without varying the mean loads. The effect of the hydrodynamic and blade's inertia, the material damping, and the radial shear stress, …
- Conference Paper:
Cuthill et al.
… The structural lifetime fatigue testing of tidal turbine blades is currently a challenge faced by the tidal industry. Due to the high stiffness and short length of composite tidal blades, it is not possible to perform resonant fatigue testing in the same way … too high a natural frequency which, if tested resonantly, would result in internal heating of the composite and lead to premature failure. The aerospace industry uses conventional …
- Journal Article:
Garcia-Teruel and Forehand
… through proxies based on the device's size. When using an optimisation process capable of generating very diverse shapes, more complex objective functions may be required to ensure that resulting shapes truly minimise the levelised cost of energy. For this purpose, relevant cost factors with an effect on geometry, such as …
- Journal Article:
Cotten and Forehand
… The WaveTrain device is a wave energy converter concept designed to extend the high performance of buoys that undergo sloped motion into a deep water environment. It achieves this by mechanically interconnecting a series of sloped modules, amongst which restorative forces can be exchanged in order to prevent … free motion along the inclined axis is retained. Importantly, this circumvents the requirement of a rigid seabed connection, but introduces a potential vulnerability of operational failure of …
- Thesis:
Naberezhnykh
… among renewable technologies due to its high predictability, making it an essential part of the renewable energy mix. However, extracting energy from turbulent and energetic tidal sites … to higher safety factors and increased device costs. This work investigates the suitability of current methodologies and wind-based turbulence models for tidal applications. It aims to … for fatigue loading, helping to reduce uncertainty in device design. Comparisons of semi-empirical models to turbulence measurements from four Acoustic Doppler Current Profilers …
- Journal Article:
McGilton et al.
… The marine energy industry is in its early stages but has a large potential for growth. One of the most significant challenges is the reduction of operation and maintenance costs. Magnetic gears (MGs) offer the potential for long periods … frictionless torque transmission which could reduce these costs. This study presents a summary of the state of the art in MG technology and then investigates its potential for marine energy …
- Journal Article:
Giacalone et al.
… is a novel technology to directly convert low-grade heat into electricity. It consists of a reverse electrodialysis (RED) unit where electricity is produced exploiting the salinity … to treat the solutions exiting from the RED unit and restore their initial composition. One of the most important advantages of closed-loop systems compared to the open systems is the possibility to select ad-hoc salt …
- 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 …
- Journal Article:
Medina-Lopez et al.
… This paper presents a numerical model to analyse the effects of changes in the bedforms morphology on Oscillating Water Column (OWC) wave energy devices. The … The seabed forms were reproduced with the morphodynamic model XBeach-G for a series of characteristic sea states in Playa Granada (southern Spain). These bedforms were used as input … bed geometries in FLUENT® and compared with a hypothetical flat seabed to analyse the effects of changes in bed level on the OWC performance. Results of the simulated sea states reveal the …
- Journal Article:
Scarlett et al.
… blade can experience stall delay, load hysteresis and dynamic stall. Yet, the significance of these effects for a full-scale axial-flow turbine are unclear. To investigate, we develop a simple model for the unsteady hydrodynamics of the rotor and consider field measurements of the onset flow. We find that when the rotor operates in large, yet realistic wave conditions, …
- Journal Article:
Brooking and Mueller
… to convert the energy in sea waves directly into electrical energy. The reciprocating movement of the generator caused by the waves results in an electrical output that is variable in voltage and frequency, with a low-frequency amplitude oscillation of the same frequency as the reciprocating vertical movement of the waves. Power conditioning is required to extract the energy from the linear generator, and …
- 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 …
- Conference Paper:
Vogel et al.
… Tidal turbines are deployed for extended periods in a harsh environment with significant levels of flow induced unsteady loading. The contributions of these loads to fatigue damage of the turbine blades is not well understood, contributing to over-engineered structures with …
- Journal Article: Li et al.
Modelling dynamic loadings of a tidal stream turbine in combined wave-current-turbulence environment
… The understanding of hydrodynamic loadings on a Tidal Stream Turbine (TST) is important to its design, deployment … model has been validated by comparing its outputs to the scale model tests conducted in Edinburgh University’s FloWave wave-current facility. The impact of combined waves, currents, and … - Conference Paper:
Dubon et al.
… Fatigue testing for tidal turbine blades involves the application of cyclic loads without matching the blade's natural frequency, which is challenging due to their high stiffness and associated thermal issues of composite materials at those frequencies (typically around 18Hz cycles). An auxiliary system … inefficient. To solve this problem, researchers utilized real on-site data to define a series of equivalent target loads and implemented them in FastBlade, which proved an efficient way to …
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