Topic
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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TL;DR: In this article, a small-scale model of a point absorber equipped with a device that is able to adjust the length of the rope connected to the generator was designed and realized to increase the energy absorption during tides.
12 citations
TL;DR: In this paper, an analytical model is developed for the motion response and wave attenuation of a raft-type wave power device, which is validated by comparison of the present results with the existing ones, and energy conservation is checked.
Abstract: In this paper, an analytical model is developed for the motion response and wave attenuation of a raft-type wave power device. The analytical solution of diffraction and radiation problem of multiple two-dimensional rectangular bodies floating on a layer of water of finite depth is obtained using a linearized potential flow theory. Wave excitation forces, added masses and wave damping coefficients for these bodies are calculated from incident, diffracted and radiated potentials. Upon solving the motion equation, response, power absorption and wave attenuation of a raft-type wave power device are obtained. The model is validated by comparison of the present results with the existing ones, and energy conservation is checked. The validated model is then utilized to examine the effect of power take-off damping coefficient, raft draft, spacing between two rafts, water depth, and raft numbers on power absorption and wave transmission coefficient of raft-type wave power device. The influence of structure length ratio is also discussed. It is found that the same wave transmission coefficient can be obtained by any certain raft-type wave power device, regardless of wave propagation direction.
12 citations
Patent•
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27 Dec 1996
TL;DR: In this article, an SIR measuring method measures an S/N ratio, which is a ratio of expected wave power to noise power or an S /I ratio, where the expected wave powers to interference power is the ratio of the expected power to the interference power.
Abstract: PROBLEM TO BE SOLVED: To measure and SIR(selective information retrieval) with high accuracy with a simple structure and operation. SOLUTION: An SIR measuring method measures an S/N ratio which is a ratio of expected wave power to noise power or an S/I ratio which is a ratio of expected wave power to interference wave power. In such cases, a signal point changing part 51 takes an absolute value of an I component (common mode component) and a Q component (rectangular component) of a receiving signal, converts the receiving signal into a signal of the 1st quadrant of an I-Q rectangular coordinate system and calculates a 1st mean power (expected wave power) S by squaring a mean value of the converted signal. A receiving power operating part 54 operates the mean value of a squared receiving signal, calculates the mean value of receiving power and calculates noise power or interference wave power I by subtracting the power S from the receiving power. An SIR operating part 57 operates an S/N ratio or an S/I ratio from the power S and noise power or the power I and outputs it.
12 citations
TL;DR: In this article, a theoretical model based on the linear potential theory is presented for two heaving oscillating water column (OWC) devices separated by a gap, which includes relative motion and phase control between the devices and trapped water columns, and the hydrodynamic performance is evaluated.
Abstract: A theoretical model based on the linear potential theory is presented for two heaving oscillating water column (OWC) devices separated by a gap. The model includes relative motion and phase control between the devices and trapped water columns, and the hydrodynamic performance of the dual-OWC system thence evaluated. Matching conditions are employed along the common interfaces, and the power take-off model and motion equations of the OWC devices are incorporated into the solution procedure. At the top of each chamber, a Wells turbine is installed to extract wave power. To achieve the optimal overall power extraction performance, a numerical strategy of successive approximation is utilized to seek the optimal turbine damping combinations for the separated units. The effects of lip-wall draft and chamber breadth on the performance of a fully-free heaving dual-OWC system are explored. In view of the deficiency of a fully-free heaving system, two alternative optimization strategies are proposed, one focusing on the control of relative motion and phase between the water columns and the heaving devices, the other on utilizing resonance phenomenon inside the gap, achieved by tuning imposed linear spring constants and gap distance, respectively. It is shown that the control between heave motion of devices and water columns inside the chambers is beneficial for extracting more power over a broader range of wave frequencies. Moreover, enhanced extraction is likely over a wider range of wave conditions when the gap distance to wavelength triggers a sloshing mode inside the gap.
12 citations
01 Jan 2006
12 citations