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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, a new waterproof point absorber, named Dual Resonance wave-energy convertor (DR-WEC), is put forward in which two resonance frequencies can be found due to the existence of two sets of mass-spring subsystems and the influence of three mechanical parameters, i.e., the internal mass, stiffness of spring and damping of power-take off (PTO) system, on the capture width ratio is studied.

24 citations

Proceedings ArticleDOI
22 Sep 2005
TL;DR: In this paper, anisotropic heating with Tperp > Tpar was found to be consistent with parametric decay of the incident fast wave (ω > 13ωc) into ion Bernstein waves and an unobserved ion cyclotron quasi-mode.
Abstract: High Harmonic Fast Wave (HHFW) heating experiments on NSTX have been observed to be accompanied by significant edge ion heating (Ti >> Te). This heating is found to be anisotropic with Tperp > Tpar. Simultaneously, coherent oscillations have been detected with an edge Langmuir probe. The oscillations are consistent with parametric decay of the incident fast wave (ω > 13ωc) into ion Bernstein waves and an unobserved ion‐cyclotron quasi‐mode. The observation of anisotropic heating is consistent with Bernstein wave damping and the Bernstein waves should completely damp in the plasma periphery as they propagate toward a cyclotron harmonic resonance. The number of daughter waves is found to increase with rf power and to increase as the incident wave’s toroidal wavelength increases. The frequencies of the daughter wave are separated by the edge ion cyclotron frequency. Theoretical calculations of the threshold for this decay in uniform plasma indicate an extremely small value of incident power should be required to drive the instability. While such decays are commonly observed at lower harmonics in conventional ICRF heating scenarios they usually do not involve the loss of significant wave power from the pump wave. On NSTX an estimate of the power loss can be found by calculating the minimum power required to support the edge ion heating (presumed to come from the decay Bernstein wave). This calculation indicates at least 20–30% of the incident rf power ends up as decay waves.

24 citations

Patent
15 Apr 1993
TL;DR: In this paper, the wave machine consists of an immersed body with several floats (7) round a main axle (22) so as to move racks (13, 14) up and down, and so moving a transmission wheel and shaft ratchet in the same direction.
Abstract: The wave machine consists of an immersed body (1) with several floats (7) round a main axle (22) so as to move racks (13,14) up and down, and so moving a transmission wheel (19) and shaft ratchet in the same direction. Flywheels or rotors (23) are used to ensure co-ordinated rotation, using the stored energy to generate current, passed onshore via underwater cables. Arms (2) are arranged in an ascending star on the main body which reach up to the water surface to terminate in bearings (3) for respective holding arms (4). The arms work as two-arm levers and are deflected by the floats in time with the waves, using a vertically descending lifting rod (10) on each arm load arm (6) clear of the main body. The rods transfer this movement via racks (13,14) to pinion wheels (16,17) mutually locked by free-wheels and the deflector shafts (15). All shafts (15) engage bevel gearing (19) in the body and pass low speed rotations through a free-wheel clutch (20) to multi-stage gearing (21). The gearing gives high output speed to drive the working shaft whose variable mass flywheel is adapted in speed to the energy supply and passes this through a converter to the generators (35). USE/ADVANTAGE - Renewable energy sources, wave power. Float-operated rack linkage responds to wave and tide movement for max. energy recovery and power generation.

24 citations

Journal ArticleDOI
TL;DR: In this paper, a new combined concept consisting of an oscillating water column (OWC) device and an offshore wind turbine for the multi-purpose utilization of offshore renewable energy resources is presented.

24 citations

Journal ArticleDOI
TL;DR: Zhelyazkov et al. as mentioned in this paper studied the influence of a metal enclosure on the electromagnetic wave characteristics and on the structure of a plasma column sustained by the wave itself, and obtained axial profiles of the dimensionless electron number density, wave power, wave number, and wave electric field components.
Abstract: In this paper, we have studied the influence of a metal enclosure on the electromagnetic wave characteristics and on the structure of a plasma column sustained by the wave itself. The present work is an extension of a theoretical model of a plasma column produced by a traveling azimuthally-symmetric electromagnetic surface wave (Zhelyazkov, I. and Benova, E., J. Appl. Phys. 66, 1641 (1989)). The axial profiles of the dimensionless electron number density, wave power, wave number, and wave electric field components have been obtained as a function of an additional parameter η - R1/R taking into account the presence of a metal enclosure near the discharge tube (R being the plasma column radius, R1 the metal tube radius). These results are applied to particular experimental setups.

23 citations


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