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- Journal Article:
Ashlin et al.
Wave energy is a renewable energy source that has an immense potential for exploitation as clean energy. Studies on the oscillating water column (OWC) widely pertain to the optimization of its geometries to enhance the wave power absorption; comparatively, the wave-induced loadings on such structures have received lesser attention. Hence, in this study, a detailed experimental investigation…
- Journal Article:
Kotb et al.
A simple approach has been implemented to identify the optimum RO (Reverse Osmosis) system structure and the operating parameters leading to the minimum total cost. Various two-stage and three-stage arrangements of practical functionality have been optimized. All possible operating points and its corresponding cost have been obtained and a linear search is used to find the minimum cost. The…
- Journal Article:
Bailey and Bryden
This paper describes a non-linear power take-off system within a buoyant heaving wave 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…
- Journal Article:
Wolgamot and Fitzgerald
Ocean wave energy has been of interest since at least the mid-1970s and great advances in the understanding of the fundamental principles of wave energy extraction and converter modelling have been made using linear hydrodynamic analysis. This paper reviews efforts that have been made to use nonlinear hydrodynamics to analyse wave energy converter behaviour and performance. Both ‘partially…
- Journal Article:
Anbarsooz et al.
One of the main geometrical parameters of the fixed oscillating water column wave energy converters is the inclination angle of front wall. In this study, the effects of this parameter on the hydrodynamic performance of an oscillating water column is investigated using a fully nonlinear two-dimensional numerical wave tank, which is developed using the Ansys Fluent 15.0 commercial software. The…
- Journal Article:
Ozkan and Mayo
Recently there has been a global effort to increase the utilization of renewable energy resources. In this study, we use observed data to estimate the ocean wave power available in coastal Florida. We find that average values ranging from 2.073 to 6.939 kW/m are available annually. It is shown that these values vary spatially; regions in the Atlantic Ocean have more available wave power than…
- Journal Article:
Wilbert et al.
The principle of oscillating water column within a chamber due to the propagating oscillatory ocean waves being converted into clean energy through wave energy convertor referred to as Oscillating water column (OWC) device is a well proven concept that still remains as one of the most promising alternate sources of energy from the Ocean. The OWC has single column of water oscillation, whereas…
- Journal Article:
Setoguchi et al.
Bidirectional flow air turbines are used in association with oscillating water columns to convert wave energy available in the oceans into mechanical power. Radial turbines, among others, were studied for such an application. The efficiency of radial turbines using reaction blading was found to be extremely low. On the other hand, the efficiency of impulse-type radial turbines was found to be…
- Journal Article:
Zhang et al.
This article describes a double action hydraulic power take off for a wave energy converter of inverse pendulum. The power take off converts slow irregular reciprocating wave motions to relatively smooth, fast rotation of an electrical generator. The design of the double action power take off and its control are critical to the magnitude and the continuity of the generated power. The…
- Journal Article:
Zhang et al.
In wave energy converters, it is hard to achieve efficient and stable energy generation because of wave instability. Based on a hydraulic transmission system of single float wave power generation equipment, this article studies the effect of throttle valve opening on power generation quality by AMESim simulation and semi-physical experiment. Results show that it is feasible to adjust throttle…
- Journal Article:
Cargo et al.
The optimisation of a wave energy converter hydraulic power take-off for sea states of varying wave amplitude, direction and frequency is a significant problem. Sub-optimal configuration can result in very inefficient energy conversion, so understanding the design trade-offs is key to the success of the technology. This work focuses on a generic point absorber type wave energy converter.…
- Journal Article:
Curran et al.
The matching of a Wells air turbine to an oscillating water column (OWC) is addressed, with particular reference to design synthesis at the Islay prototype wave power converter. The level of damping applied by the turbine must optimize the hydraulic performance of the OWC in order to facilitate efficient conversion from wave power to pneumatic power. Furthermore, a Wells turbine is only able…
- Journal Article:
Muljadi and Yu
Marine hydrokinetic power generation is a relatively new type of renewable generation. Its predecessors, such as wind power generation, hydropower plant generation, geothermal generation, photovoltaic generation, and solar thermal generation, have gained a lot of attention because of their successful implementation. The successful integration of renewable generation into the electric power…
- Journal Article:
Orekan et al.
The tidal energy conversion system has become a major facility for ocean energy harvesting. The intermittency of tidal currents and the resulting large cyclic stresses in the tidal generator, however, make the energy harvesting from tidal currents more challenging than from other renewable sources, such as wind and solar. This paper presents a concept of maximum life-cycle tracking, which…
- Journal Article:
Kassem et al.
This article studies the problem of maximizing the take-off power from a buoy-type point absorber of a wave energy converter. The article offers a solution framework for the above-mentioned problem under the linear quadratic Gaussian control approach. The standard Kalman estimator technique is used to estimate the position and velocity of the two-body wave energy system. The optimal power take…
- Journal Article:
de la Villa Jaén et al.
The aim of wave energy converters is to extract energy from ocean waves and turn it into electricity. Since the earliest developments, optimal control strategy has been considered the one that optimizes the power extracted from the oscillating system. This technique requires energy exchanges between the oscillating system and an auxiliary storage energy system, and has been shown to be…
- Journal Article:
Paredes et al.
Mooring systems are required to keep floating wave energy converters (WECs) on station. The mooring concept might impact the performance of the WEC, its cost and its integrity. With the aim of clarifying the pros and cons of different mooring designs, we present the results from physical model experiments of three different mooring concepts in regular and irregular waves, including operational…
- Journal Article:
Fusco and Ringwood
Energy-maximizing controllers for wave energy devices are normally based on linear hydrodynamic device models. Such models ignore nonlinear effects which typically manifest themselves for large device motion (typical in this application) and may also include other modeling errors. The effectiveness of a controller is, in general, determined by the match between the model the controller is…
- Journal Article:
Epps et al.
Marine hydrokinetic turbines are a promising source of renewable energy, but the costs of existing cross-flow turbine designs are too high. In order to develop new designs with reduced costs, there exists a need for a low-order computational model that is simultaneously fast, accurate, and robust. Herein, we present a novel theoretical model for the analysis of cross-flow propellers and…
- Journal Article:
Wang et al.
Some offshore wind farms are built in seismically active areas. The offshore wind turbine (OWTs) are high-rise structures and sensitive to lateral failures during the earthquake. In this study, an innovative hybrid monopile foundation is proposed for OWTs. A series of centrifuge shake table tests is conducted to investigate the seismic response and liquefaction characteristics of the hybrid…
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