scholarly journals Far-field theory of wave power capture by oscillating systems

2012 ◽  
Vol 370 (1959) ◽  
pp. 278-287 ◽  
Author(s):  
F. J. M. Farley
Keyword(s):  
Field Theory ◽  
Power Converter ◽  
Wave Power ◽  
Far Field ◽  
Polar Diagram ◽  
Oscillating Systems ◽  
Power Capture ◽  
The Waves

A new derivation is given of an equation, relating the capture width of a wave power converter to the polar diagram of the waves generated by the device. The pattern of waves in the lee of the device is calculated in detail.

Numerical Simulation of Interactions between Waves and Pendulum Wave Power Converter

2013 ◽  
Vol 291-294 ◽  
pp. 1949-1953
Author(s):  
Yu Feng Tian ◽  
Yan Huang
Keyword(s):  
Reference Method ◽  
Power Converter ◽  
Navier Stokes ◽  
Wave Power ◽  
Governing Equations ◽  
Finite Element Software ◽  
Region Method ◽  
Boundary Method ◽  
Physical Model Tests ◽  
Pendulum Wave

The interactions between waves and the pendulum wave power converter were simulated, considering Navier-Stokes (N-S) equations as governing equations of the fluid, using the k-ε turbulence model and finite element software ADINA. The setting wave-generating boundary method and viscosity damping region method were developed in the numerical wave tank. Nodal velocities were applied on each layer of the inflow boundary in the setting wave-generating boundary method. The viscosity of the fluid in the damping region was obtained artificially in the viscosity damping region method, and the energy in the fluid was decreased by the viscosity in governing equations. The physical model tests were simulated with the fluid-structure interaction (FSI) numerical model. The numerical results were compared with the experimental data, and then the results were discussed. A reference method is advanced to design the pendulum wave power converter. The method to solve the complex FSI problems is explored.

Harnessing the waves [wave power]

2016 ◽  
Vol 11 (6) ◽  
pp. 72-5
Author(s):  
R. Brazil
Keyword(s):  
Wave Power ◽  
The Waves

Suppression Approaches of Far-Field Radiated Emission Using Common-Mode Inductor

2021 ◽  
Vol 1 (2) ◽  
pp. 1-5
Author(s):  
Mengzi Li ◽  
◽  
Shishan Wang ◽  
Jian Guo
Keyword(s):  
High Frequency ◽  
Reference Value ◽  
Power Converter ◽  
Practical Significance ◽  
Far Field ◽  
Common Mode ◽  
Suppression Method ◽  
Switching Mode ◽  
Emc Design ◽  
Radiated Emission

The miniaturization and integration of Switching Mode Power Supply (SMPS) is increasing, making it more complicated to analyze and predict its far-field radiated emission, and, consequently, studying the suppression method of far-field radiated emission of SMPS is of practical significance and engineering value. In this paper, a high-frequency SMPS is selected as the research object, whose far-field radiated emission is measured under the condition of three typical suppression methods. The experimental results verified the effectiveness of common-mode inductor and are of reference value for EMC design of power converter. Keywords: SMPS; EMC; Far-field Radiated Emission;

FIELD EXPERIMENTS OF A WAVE POWER CONVERTER WITH CAISSON BREAKWATER

1992 ◽  
pp. 2530-2535 ◽  
Author(s):  
Hiroaki Nakada ◽  
Hideaki Ohneda ◽  
Shigeo Takahashi ◽  
Masazumi Shikamori ◽  
Tadashige Nakazono
Keyword(s):  
Field Experiments ◽  
Power Converter ◽  
Wave Power ◽  
Caisson Breakwater

scholarly journals Stern waves with vorticity

2002 ◽  
Vol 43 (3) ◽  
pp. 321-332 ◽  
Author(s):  
Y. Kang ◽  
J.-M. Vanden-Broeck
Keyword(s):  
Integral Equation ◽  
Numerical Solutions ◽  
Free Surface Flow ◽  
Integral Equation Method ◽  
Surface Flow ◽  
Boundary Integral ◽  
Analytical Relation ◽  
Far Field ◽  
Two Dimensional ◽  
The Waves

AbstractSteady two-dimensional free surface flow past a semi-infinite flat plate is considered. The vorticity in the flow is assumed to be constant. For large values of the Froude number F, an analytical relation between F, the vorticity parameter ω and the steepness s of the waves in the far field is derived. In addition numerical solutions are calculated by a boundary integral equation method.

scholarly journals Study on Performance of Pendular Wave Power Converter Attached to Detached Breakwater of Pillar Type

1995 ◽  
Vol 11 ◽  
pp. 271-275
Author(s):  
Kakuya Hasegawa ◽  
Hideo Kondo ◽  
Hiroshi Umeda ◽  
Hitoshi Nishimaki
Keyword(s):  
Power Converter ◽  
Wave Power

Design synthesis of oscillating water column wave energy converters: Performance matching

1997 ◽  
Vol 211 (6) ◽  
pp. 489-505 ◽  
Author(s):  
R Curran ◽  
T P Stewart ◽  
T J T Whittaker
Keyword(s):  
Water Column ◽  
Limited Range ◽  
Power Converter ◽  
Analytical Models ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Wells Turbine ◽  
Design Synthesis ◽  
Wave Energy Converters ◽  
Pneumatic Power

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 to convert pneumatic power to mechanical power over a limited range of flow coefficients. Therefore, the efficient operational range of the turbine must extend over a sufficient and optimal proportion of the range of flow coefficients generated by the OWC. Suitable analytical models that describe the behaviour of the system are presented and subsequently the wave conditions and conversion performance at the Islay plant are outlined in order to exemplify the design synthesis to be achieved.

Wave Spectral Bandwidth as a Measure of Available Wave Power

2006 ◽  
Author(s):  
George H. Smith ◽  
Vengatesan Venugopal ◽  
Jack Fasham
Keyword(s):  
Transfer Functions ◽  
Power Production ◽  
Wave Power ◽  
Wave Spectra ◽  
Energy Converter ◽  
Sea State ◽  
Spectral Moments ◽  
Constant Height ◽  
Bandwidth Parameter ◽  
Power Capture

A key requirement in the description of the performance of a wave energy converter is how the efficiency of power capture changes with the properties of the sea. This paper examines the effect of two generic power transfer functions (PTF) on power production from six simulated wave spectra. These were chosen to represent a series of wind, wind-swell mixed and swell dominated seas. The spread in energy within the sea state as defined by a variety of bandwidth parameters was examined to determine if there was a correlation between the width of the transfer function and the sea bandwidth. It was found that, for the ‘constant’ height PTF, the bandwidth parameter Bb (calculated using zeroth, minus-one and minus-two spectral moments) provided the best correlation. Customary bandwidths ε and ν performed poorly. When the PTF was allowed to vary in height as well as width there was little improvement in correlation from the un-scaled results.

scholarly journals ECONOMIC EVALUATION OF POWER WAVES AT THE BEACH TEGAL

2017 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Soebyakto Soebyakto
Keyword(s):  
Wave Velocity ◽  
Electrical Power ◽  
Average Frequency ◽  
Economic Research ◽  
Wave Power ◽  
Maximum Height ◽  
Average Value ◽  
Port Area ◽  
Tapered Channel ◽  
The Waves

Observations of electric power of the waves hitting beach Tegal is obtained by finding the value of the speed, frequency and height of the waves on the beach Tegal. The average value of the wave velocity of 0.15 m/s, the average frequency of 0.17 Hz and a maximum height of 0.6 m on average. This data is still too low to generate electrical power from the mechanical power of the waves. We are still conducting research to increase the speed and height of the waves with a method of "Tapered Channel". This method is expected to raise the value of the wave height of 0.5 m to 2.2 m. Waves of electrical power is estimated to rise to 15.4 Watt/m2 25-50 Watt/m2.In economic calculation, the power of the waves starting from the value of the wave power per m2 per 4 m2. If we need a 100 Watt power of the waves, the beach area that required 4 m2. Economic development beach with waves generate electrical power, built outside the port area, so that the fishermen keep doing the fishing business as it should be. Based on the results of research in theory, the power of the waves is the speed of the wave function that describes the linear curve. However, the results of research that has been done show that the power of the waves is a function of the speed of the waves, which described as a hyperbolic curve. Wave power increases with increasing speed of the waves. While the formulation used is the wave velocity is a function of the height of the waves. By using the method of "Tepered Channel" to catch a wave, the wave speed will be higher. The results of economic research to generate electrical waves can be calculated byeconomic aspects of the compute power of the waves and technological aspects by counting the frequency of the waves

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