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Wave power

About: Wave power is a research topic. Over the lifetime, 2671 publications have been published within this topic receiving 41439 citations. The topic is also known as: wind wave energy & sea wave energy.


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Journal ArticleDOI
TL;DR: In this paper, the authors investigated wave propagation in a superlattice consistent of dielectric material with a nonlinear Kerr coefficient and found gaps in the propagating properties of the medium that depend critically on the injected wave power.
Abstract: We investigate wave propagation in a superlattice consistent of dielectric material with a nonlinear Kerr coefficient. We find gaps in the propagating properties of the medium that depend critically on the injected wave power. This property can be used for transmission of information.

15 citations

Book ChapterDOI
13 Mar 2013
TL;DR: In this paper, the authors introduce potential renewable power sources of ocean, mostly ocean wave power, as well as available technologies for ex tracting wave power and provide essential information about ocean wave, methods of energy extracting from wave and related electrical equipment.
Abstract: In last decades, in effect of high price of fossil fuel, environmental pollution due to fossil fuel utilization and greenhouse effect, renewable energy resources are considered as an alterna‐ tive energy resource to the World’s excessive energy demand. Nowadays, different technol‐ ogies are utilized to energy generation from hydro power, fuel cell and hydrogen, biomass, geothermal, solar thermal, photovoltaic and wind, while the technology for converting ocean powers are still in infancy. The aim of this chapter is to introduce potential renewable power sources of ocean, mostly ocean wave power, as well as available technologies for ex‐ tracting wave power. Due to high energy amount available in ocean, the issue has a strong importance to investigate. Furthermore there are variety of technologies that are developed for harnessing wave power each of which has an individual mechanism. Harvesting ocean wave power and converting to electrical power is a challenge for marine, mechanical, elec‐ trical and control engineers and we hope to give essential information about ocean wave, methods of energy extracting from wave and related electrical equipment.

15 citations

01 Jan 1995
TL;DR: In this paper, a full description of the application of image shifting to the technique of particle image velocimetry (PIV) is given along with a discussion of the design and construction of a versatile rotating mirror image shifting system.
Abstract: A full description of the application of image shifting to the technique of particle image velocimetry (PIV) is given along with a discussion of the design and construction of a versatile rotating mirror image shifting system. The use of such a shifting system leads to systematic errors in the measured fluid velocities and it is shown that these errors can be accounted for and that a correction may be applied to eliminate them. A description of PIV itself and, in particular, the application of PIV to a study of the internal kinematics of an OWC in a wave flume is also provided. A simple semi-empirical model of the response of an OWC to a given wave climate is developed and its predictions are compared with air pressure and water level measurements obtained during flume tests of a model OWC. Finally detailed PIV time-series measurements, incorporating image shifting, are made of the flow within the OWC chamber and it is shown that as much as 7% of the wave energy may be lost due to viscous dissipation within the strong vortices which are formed around the submerged lip of the front wall of the model. Declaration This Thesis has been composed by me and, except where stated, the work contained is my own.

15 citations

Journal ArticleDOI
TL;DR: In this article, the evolution of He+mode electromagnetic ion cyclotron (EMIC) waves is studied inside the geostationary orbit using our global model of ring current (RC) ions, electric field, plasmasphere, and EMIC waves.
Abstract: The evolution of He+-mode electromagnetic ion cyclotron (EMIC) waves is studied inside the geostationary orbit using our global model of ring current (RC) ions, electric field, plasmasphere, and EMIC waves. In contrast to the approach previously used by Gamayunov et al. (2009), however, we do not use the bounce-averaged wave kinetic equation but instead use a complete, nonbounce-averaged, equation to model the evolution of EMIC wave power spectral density, including off-equatorial wave dynamics. The major results of our study can be summarized as follows. (1) The thermal background level for EMIC waves is too low to allow waves to grow up to the observable level during one pass between the “bi-ion latitudes” (the latitudes where the given wave frequency is equal to the O+–He+ bi-ion frequency) in conjugate hemispheres. As a consequence, quasi-field-aligned EMIC waves are not typically produced in the model if the thermal background level is used, but routinely observed in the Earth's magnetosphere. To overcome this model-observation discrepancy we suggest a nonlinear energy cascade from the lower frequency range of ultralow frequency waves into the frequency range of EMIC wave generation as a possible mechanism supplying the needed level of seed fluctuations that guarantees growth of EMIC waves during one pass through the near equatorial region. The EMIC wave development from a suprathermal background level shows that EMIC waves are quasi field aligned near the equator, while they are oblique at high latitudes, and the Poynting flux is predominantly directed away from the near equatorial source region in agreement with observations. (2) An abundance of O+ strongly controls the energy of oblique He+-mode EMIC waves that propagate to the equator after their reflection at bi-ion latitudes, and so it controls a fraction of wave energy in the oblique normals. (3) The RC O+ not only causes damping of the He+-mode EMIC waves but also causes wave generation in the region of highly oblique wave normal angles, typically for θ > 82°, where a growth rate γ > 10−2rad/s is frequently observed. The instability is driven by the loss cone feature in the RC O+ distribution function, where ∂F/∂v⟂>0 for the resonating O+. (4) The oblique and intense He+-mode EMIC waves generated by RC O+ in the region L≈2–3 may have an implication to the energetic particle loss in the inner radiation belt.

15 citations

Proceedings Article
15 Sep 2011
TL;DR: In this paper, the problem of the power oscillation introduced intro the electric grid due to the zero speed point at the end of the stroke was studied and four different solutions were analyzed: first option is to plan the distribution of the point absorbers in the wave farm considering the most predominant wave period, second is to control the device by means of supplying some reactive PTO force in order to get a more reduced power oscillations, maintaining a compromise with the resonance situation which is desired to get the maximum energy transference, third consists on controlling the system with a hybrid strategy that
Abstract: Linear generators used as direct-drive solution in wave energy conversion have the main advantage of higher efficiency and more simple and robust system. However there are some important drawbacks that should be solved to increase the reliability and feasibility. This paper will study in detail the problem of the power oscillation introduced intro the electric grid due to the zero speed point at the end of the stroke. Four different solutions are analyzed: first option is to plan the distribution of the point absorbers in the wave farm considering the most predominant wave period; second is to control the device by means of supplying some reactive PTO force in order to get a more reduced power oscillation, maintaining a compromise with the resonance situation which is desired to get the maximum energy transference; third consists on controlling the system with a hybrid strategy that includes a DC-link voltage control and direct power control; and finally the fourth solution consists on the addition of energy storage systems, independent of the generator to absorb and develop the excess and defaults of energy. Some of the solutions can be implemented together and the benefits of the resulting system increase.

15 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202349
2022117
2021111
2020142
2019137
2018138