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Journal articles on the topic 'Wave energy conversion'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sridhar Mantripragada, Rama Sesha, C. J. Schreck III, and Anantha Aiyyer. "Energetics of Interactions between African Easterly Waves and Convectively Coupled Kelvin Waves." Monthly Weather Review 149, no. 11 (2021): 3821–35. http://dx.doi.org/10.1175/mwr-d-21-0003.1.

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Abstract Perturbation kinetic and available energy budgets are used to explore how convectively coupled equatorial Kelvin waves (KWs) impact African easterly wave (AEW) activity. The convective phase of the Kelvin wave increases the African easterly jet’s meridional shear, thus enhancing the barotropic energy conversions, leading to intensification of southern track AEWs perturbation kinetic energy. In contrast, the barotropic energy conversion is reduced in the suppressed phase of KW. Baroclinic energy conversion of the southern track AEWs is not significantly different between Kelvin waves’

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Falnes, Johannes, and Adi Kurniawan. "Fundamental formulae for wave-energy conversion." Royal Society Open Science 2, no. 3 (2015): 140305. http://dx.doi.org/10.1098/rsos.140305.

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The time-average wave power that is absorbed from an incident wave by means of a wave-energy conversion (WEC) unit, or by an array of WEC units—i.e. oscillating immersed bodies and/or oscillating water columns (OWCs)—may be mathematically expressed in terms of the WEC units' complex oscillation amplitudes, or in terms of the generated outgoing (diffracted plus radiated) waves, or alternatively, in terms of the radiated waves alone. Following recent controversy, the corresponding three optional expressions are derived, compared and discussed in this paper. They all provide the correct time-aver

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3

Ji, Zhifei, Xiaodong Yuan, Min Lin, and Jianyu Fan. "Hydrodynamic Analysis of 3-SPS Wave Energy Conversion Device." E3S Web of Conferences 271 (2021): 01013. http://dx.doi.org/10.1051/e3sconf/202127101013.

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Wave energy has the advantages of high energy density, renewability, and wide distribution, and has been highly valued by many coastal countries. The wave energy conversion device can convert wave energy into electric energy, which is of great significance for alleviating problems such as energy crisis and greenhouse effect. The traditional wave energy conversion device can only gain the energy along the heave direction, and the kinetic energy of the buoy is not fully utilized. To improve the energy utilization efficiency of the wave energy conversion device, this paper proposed a new type of

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KONNO, Toshio, Yoshihiro NAGATA, Manabu TAKAO, and Toshiaki SETOGUCHI. "C107 RADIAL TURBINE WITH AIRFLOW RECTIFICATION SYSTEM FOR WAVE ENERGY CONVERSION(Solar, Wind and Wave Energy-2)." Proceedings of the International Conference on Power Engineering (ICOPE) 2009.1 (2009): _1–167_—_1–171_. http://dx.doi.org/10.1299/jsmeicope.2009.1._1-167_.

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Bouhrim, Hafsa, Abdellatif El Marjani, Rajae Nechad, and Imane Hajjout. "Ocean Wave Energy Conversion: A Review." Journal of Marine Science and Engineering 12, no. 11 (2024): 1922. http://dx.doi.org/10.3390/jmse12111922.

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The globally increasing demand for energy has encouraged many countries to search for alternative renewable sources of energy. To this end, the use of energy from ocean waves is of great interest to coastal countries. Hence, an assessment of the available resources is required to determine the appropriate locations where the higher amount of wave energy can be generated. The current paper presents a review of the resource characterizations for wave energy deployment. The paper gives, at first, a brief introduction and background to wave energy. Afterward, a detailed description of formulations

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Zhang, Wanchao, Yang Zhu, Shuxu Liu, Jianhua Wang, and Wentian Zhang. "Evaluation of Geometrical Influence on the Hydrodynamic Characteristics and Power Absorption of Vertical Axisymmetric Wave Energy Converters in Irregular Waves." Polish Maritime Research 30, no. 2 (2023): 130–45. http://dx.doi.org/10.2478/pomr-2023-0029.

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Abstract To obtain the mechanical energy of waves from arbitrary directions, the vibration absorbers of wave energy converters (WEC) are usually vertically axisymmetric. In such case, the wave-body interaction hydrodynamics is an essential research topic to obtain high-efficiency wave energy. In this paper, a semi-analytical method of decomposing the complex axisymmetric boundary into several ring-shaped stepped surfaces based upon the boundary approximation method (BAM) is introduced and examined. The hydrodynamic loads and parameters, such as the wave excitation forces, added mass and radiat

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McCormick, Michael E., Robert C. Murtha, and Jeffrey Steinmetz. "Wave Energy Conversion for Shoreline Protection." Marine Technology Society Journal 47, no. 4 (2013): 187–92. http://dx.doi.org/10.4031/mtsj.47.4.1.

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AbstractThis paper is based on the premise that “wave energy conversion” is the conversion of the energy of ocean waves into other energy forms for the benefit of the environment. By taking advantage of the diffraction focusing phenomenon, commonly associated with water wave energy conversion, a bimodal buoy called the Antenna Buoy has been developed to both attract and dissipate incident water wave energy. As a result, arrays of the buoy can be deployed to form an effective floating breakwater system. Results from a full-scale experimental study show that an array of buoys, with each buoy pai

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Qin, Shufang, Jun Fan, Haiming Zhang, Junwei Su, and Yi Wang. "Flume Experiments on Energy Conversion Behavior for Oscillating Buoy Devices Interacting with Different Wave Types." Journal of Marine Science and Engineering 9, no. 8 (2021): 852. http://dx.doi.org/10.3390/jmse9080852.

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Oscillating buoy device, also known as point absorber, is an important wave energy converter (WEC) for wave energy development and utilization. The previous work primarily focused on the optimization of mechanical design, buoy’s array configuration and the site selection with larger wave energy density in order to improve the wave energy generation performance. In this work, enlightened by the potential availability of Bragg reflection induced by multiple submerged breakwaters in nearshore areas, we investigate the energy conversion behavior of oscillating buoy devices under different wave typ

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9

KAUFMAN, A. N., J. J. MOREHEAD, A. J. BRIZARD, and E. R. TRACY. "Mode conversion in the Gulf of Guinea." Journal of Fluid Mechanics 394 (September 10, 1999): 175–92. http://dx.doi.org/10.1017/s0022112099005649.

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Linear mode conversion is the partial transfer of wave energy from one wave type (a) to another (b) in a weakly non-uniform background state. For propagation in one dimension (x), the local wavenumber kjx of each wave (j = a, b) varies with x; if these are equal at some xR, the waves are locally in phase, and resonant energy transfer can occur. We model wave propagation in the Gulf of Guinea, where wave a is an equatorially trapped Rossby–gravity (Yanai) wave, and wave b is a coastal Kelvin wave along the (zonal) north coast of the Gulf, both propagating in zonal coordinate x. The coupling of

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CHAKRABORTY, D. R., and N. K. AGARW AL. "Effects of Coriolis force, vorticity and divergence on nonlinear energy conversions during different phases of July 1979 monsoon." MAUSAM 48, no. 3 (2021): 385–96. http://dx.doi.org/10.54302/mausam.v48i3.4267.

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ABSTRACT. Kinetic energy (KE) of the rotational and divergent flows and the nonlinear energy conversion between them due to the action of Coriolis force, divergence and vorticity, partition) further into stationary and transient motions are computed in the Fourier spectral domain during different phases of July 1979 monsoon over the latitudinal belt 10° S - 30° at 850 and 200 hPa and studied. It is found that nonlinear divergent to rotational KE exchange due to the action of Coriolis force is the primary contributor for all categories of stationary and transient waves at both the levels over t

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TAKAO, Manabu. "Developments of Wave Energy Conversion." Journal of the Society of Mechanical Engineers 111, no. 1072 (2008): 154–55. http://dx.doi.org/10.1299/jsmemag.111.1072_154.

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Hafsa, Bouhrim, El Marjani Abdellatif, and Hamid Mounir. "Wave generation in an OWC system for wave energy conversion." MATEC Web of Conferences 307 (2020): 01012. http://dx.doi.org/10.1051/matecconf/202030701012.

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This paper aims to present an overview on the wavemakers used to generate waves inside a numerical wave tank taking into consideration the biphasic air-water aspect of the incident wave. Wave markers are used to simulate the flow dynamic behaviour in the Oscillating Water Column (OWC) for wave energy conversion. Three kinds of these systems have been considered in the present work. To compare these types of wave generators a case study was adopted with the assumption of a fluid flow which is unsteady, 2D, biphasic (air-water), and k-epsilon turbulent. It has been found that the piston and the

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Aribowo, Widi, Achmad Imam Agung, Subuh Isnur Haryudo, and Syamsul Muarif. "POWER GENERATOR FROM OCEAN WAVE ENERGY CONVERSION." Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer 11, no. 2 (2021): 429–36. http://dx.doi.org/10.24176/simet.v11i2.5175.

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The need for electrical energy has increased every year. On the other hand, the largest power plants in Indonesia still use non-renewable energy sources such as coal and petroleum, while these non-renewable energy sources will eventually run out. To anticipate running out of this energy, a renewable energy source is needed. This existence will not run out even though it is consumed every day. Renewable energy that can be used for conversion into electrical energy in coastal areas is wave power. The waves that always crash on the shoreline can be used to drive turbines. The turbine rotates due

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Foo, Yee-Loo. "Wireless power transfer with transmit diversity." F1000Research 10 (September 13, 2021): 916. http://dx.doi.org/10.12688/f1000research.72986.1.

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Background: Wireless power transfer is important for energizing and recharging the Internet-of-Things (IoT) cordlessly. Harnessing energy effectively from radio waves has become a crucial task. It is known that diversities at the transmitting antenna and waves (i.e. simultaneous continuous waves with center frequencies separated apart) can enhance the radio frequency (RF) to direct current (DC) energy conversion. What remains unknown is the extent of which the wave diversity enhances the conversion gain. This study attempts to examine the RF-to-DC conversion gain of applying wave diversity. Th

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15

Oskamp, Jeffrey A., and H. Tuba Özkan-Haller. "WAVE PREDICTIONS AT THE SITE OF A WAVE ENERGY CONVERSION ARRAY." Coastal Engineering Proceedings 1, no. 32 (2011): 39. http://dx.doi.org/10.9753/icce.v32.waves.39.

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The SWAN spectral wave model was applied to a domain along the coast of Oregon State, USA with the purpose of establishing a better understanding of wave conditions at a location which has been proposed for the installation of an array of Wave Energy Converters (WECs). The model uses the directional spectrum measured at a nearby NDBC (National Data Buoy Center) buoy as input and in situ measurements of waves at the proposed WEC location for model validation. It was found that wind -wave generation and bottom friction were not significant over the domain between the NDBC buoy and the WEC site (

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16

Dewey, J. M., and D. J. McMillin. "Efficiency of energy conversion using shock waves." Canadian Journal of Physics 63, no. 3 (1985): 339–45. http://dx.doi.org/10.1139/p85-052.

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The flux-corrected transport algorithm has been used to simulate shock-wave flows in linear and spherically converging and diverging tubes in order to determine the energy distributions in the flows and the conversion efficiencies of energy to mechanical work. This was done to evaluate the possibility of using the positive phase of a shock wave, rather than combustion products, as the driving mechanism in an internal-combustion engine, and to suggest the optimum configuration of a supercharging device that uses shock waves to extract energy from the exhaust gases of internal-combustion engines

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17

Takao, Manabu, and Toshiaki Setoguchi. "Air Turbines for Wave Energy Conversion." International Journal of Rotating Machinery 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/717398.

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This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been compared by numerical simulation and sea trial. As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the

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18

TAILLEUX, RÉMI, and JAMES C. McWILLIAMS. "Energy propagation of long extratropical Rossby waves over slowly varying zonal topography." Journal of Fluid Mechanics 473 (December 10, 2002): 295–319. http://dx.doi.org/10.1017/s0022112002002422.

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In classical WKB theory the only way wave energy density, as a surrogate for wave action density, can increase or decrease along a ray is as a result of the ray focusing or widening. This occurs when the group velocity is divergent. There are particular regions, however, where the wave can resonantly exchange action with another wave mode with approximately the same wavenumbers; a situation known as Landau–Zener transition, mode conversion, linear (adiabatic) resonance, etc. This effect invalidates locally the underlying assumption of WKB theory that no scattering of energy occurs between WKB

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19

Ma, Yong, Shan Ai, Lele Yang, Aiming Zhang, Sen Liu, and Binghao Zhou. "Hydrodynamic Performance of a Pitching Float Wave Energy Converter." Energies 13, no. 7 (2020): 1801. http://dx.doi.org/10.3390/en13071801.

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This study analyzes the hydrodynamic performance and application of a pitching float-type wave energy conversion device under complex sea conditions in the South China Sea. Potential flow theory and ANSYS-AQWA software are used to establish a method for analyzing hydrodynamic performance in both time and frequency domains, as well as the various factors that influence hydrodynamic performance. The frequency domain characteristics of the conversion device are explored, as well as the time-domain characteristics when exposed to regular and irregular waves. The results show that the frequency dom

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20

McCormick, Michael E., and Oavid R. B. Kraemer. "Ocean Wave Energy Utilization." Marine Technology Society Journal 36, no. 4 (2002): 52–58. http://dx.doi.org/10.4031/002533202787908617.

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The exploitation of ocean waves in electricity production, potable-water production, waterbody revitalization and farming is discussed. Those energy-conversion technologies that are now at the prototype stage are described. The systems are those that are resonant in nature, since resonant systems have been found to be the most efficient. The efficiency of these systems is due to both diffraction-induced wave focusing and possible impedance-matching.

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21

Fang, Zifan, Xueyuan Xie, Jiajia Wang, and Fei Xiong. "Design and research on the simulation platform of Oscillating Flapping-Wing Wave Energy Converter based on AMESim." Journal of Physics: Conference Series 2125, no. 1 (2021): 012053. http://dx.doi.org/10.1088/1742-6596/2125/1/012053.

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Abstract It is a stochastic dynamic process for conversion of wave energy, which includes the coupling of multiphysics. Energy conversion efficiency and stable output are important objectives. In order to explore the mechanism of wave energy efficient conversion, a wave energy generation scheme of oscillating-flapping wing was proposed. Taking the conversion system of wave power generation device as the research object, the mechanical-hydraulic-circuit simulation platform of the system is established by the software AMESim. The proposed scheme is tested and verified. The results show that the

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FUKUMA, Seisuke, Manabu TAKAO, Shinya OKUHARA, Ashraful ALAM, and Yoichi KINOUE. "Wells Turbine for Wave Energy Conversion." Proceedings of Conference of Chugoku-Shikoku Branch 2018.56 (2018): 715. http://dx.doi.org/10.1299/jsmecs.2018.56.715.

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Salter, S. H., J. R. M. Taylor, and N. J. Caldwell. "Power conversion mechanisms for wave energy." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 216, no. 1 (2002): 1–27. http://dx.doi.org/10.1243/147509002320382103.

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It is easy to make a device that will respond vigorously to the action of sea waves. Indeed, it is quite hard to make one that will not. However, the conversion of the slow, random, reversing energy flows with very high extreme values into phase-locked synchronous electricity with power quality acceptable to a utility network is very much harder. This paper describes a range of different control strategies of varying degrees of sophistication and then describes possible conversion equipment for high-pressure oil and water and low-pressure air. Like many renewable energy sources, waves would be

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Chen, Weixing, Feng Gao, and Xiangdun Meng. "Kinematics and dynamics of a novel 3-degree-of-freedom wave energy converter." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 3 (2018): 687–98. http://dx.doi.org/10.1177/1475090218765803.

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A wide range of wave energy converter technologies has been proposed so far. Oscillating body systems are an important class of wave energy converters, which typically harvest wave energy from a single degree-of-freedom response. This article presents a novel 3-degree-of-freedom (heave, pitch and roll) wave energy converter which extracts and converts wave power efficiently. The 3-degree-of-freedom mechanism is invented to absorb and convert wave energy, no matter which direction the waves propagate. The hydraulic power take-off system comprises novel energy conversion devices which can be sup

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Lee, Hisen Hua, and T. J. Wu. "Experimental Performance for a Universal Single Mooring Platform Applied to Wave-Energy Conversion System." Applied Mechanics and Materials 385-386 (August 2013): 1070–73. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1070.

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For an offshore platform applied to wave-energy conversion system, in order to catch the maximum waves to generate more powers, similar to wind-energy power generators, a range of angles for the devices normal to the propagating direction of incident waves is required, particularly when the power converting system has directional preference. A single mooring system would allow the offshore wave-energy conversion system to turn freely in accordance to the action of strong directions of propagating waves and in this way, most energy induced from the incident waves can be caught and converted int

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Raboonik, Abbas, and Paul S. Cally. "Benchmarking hall-induced magnetoacoustic to Alfvén mode conversion in the solar chromosphere." Monthly Notices of the Royal Astronomical Society 507, no. 2 (2021): 2671–83. http://dx.doi.org/10.1093/mnras/stab2293.

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ABSTRACT A 2.5D numerical model of magnetoacoustic-Alfvén linear mode conversions in the partially ionized low solar atmosphere induced by the Hall effect is surveyed, varying magnetic field strength and inclination, and wave frequency and horizontal wavenumber. It is found that only the magnetic component of wave energy is subject to Hall-mediated conversions to Alfvén wave-energy via a process of polarization rotation. This strongly boosts direct mode conversion between slow magnetoacoustic and Alfvén waves in the quiet low chromosphere, even at mHz frequencies. However, fast waves there, wh

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Zheng, Zhongqiang, Zhipeng Yao, Zongyu Chang, Tao Yao, and Bo Liu. "A point absorber wave energy converter with nonlinear hardening spring power-take-off systems in regular waves." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, no. 4 (2020): 820–29. http://dx.doi.org/10.1177/1475090220913687.

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Point absorber wave energy converter is one of the most effective wave energy harness devices. Most of the wave energy converters generate energy by oscillating the floating body. Usually, the power-take-off system is simplified as a linear spring and a linear damper. However, the narrow frequency bandwidth around a particular resonant frequency is not suitable for real vibrations applications. Thus, a nonlinear hardening spring and a linear damper are applied in the power-take-off system. The bandwidth of hardening mechanism is discussed. The dynamic model of wave energy converter is built in

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Luo, Chen, and Luofeng Huang. "Energy Efficiency Analysis of a Deformable Wave Energy Converter Using Fully Coupled Dynamic Simulations." Oceans 5, no. 2 (2024): 227–43. http://dx.doi.org/10.3390/oceans5020014.

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Deformable wave energy converters have significant potential for application as flexible material that can mitigate structural issues, while how to design the dimensions and choose an optimal deployment location remain unclear. In this paper, fully coupled computational fluid dynamics and computational solid mechanics were used to simulate the dynamic interactions between ocean waves and a deformable wave energy converter. The simulation results showed that the relative length to wave, deployment depth and aspect ratio of the device have significant effects on the energy conversion efficiency.

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Lee, Hsien Hua, and Cheng-Han Chen. "Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater." Energies 13, no. 8 (2020): 1926. http://dx.doi.org/10.3390/en13081926.

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This study focuses on the analysis of the parameters of an oscillating water column (OWC) wave energy conversion system and wave conditions. Interactions between the dimensions of the OWC chambers and wave conditions are all taken into account to design an alternative OWC converter, called caisson-based OWC type wave energy converting system. A numerical method using an unsteady Navier-Stokes equations theorem in conservation form is used to analyze the proposed analytical model. The objective of this study is to try to apply an OWC wave energy converter to a caisson breakwater, which has been

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Meduri, Aghamarshana, and Heonyong Kang. "Array Optimization for a Wave Energy Converter with Adaptive Resonance Using Dual Bayesian Optimization." Journal of Marine Science and Engineering 12, no. 12 (2024): 2143. http://dx.doi.org/10.3390/jmse12122143.

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A novel Dual Bayesian optimization strategy is formed for an array of wave energy converters with adaptive resonance to maximize the annual performance through the energy conversion processes from irregular waves to electricity. A wave energy converter with adaptive resonance changes the natural frequency of power take-off dynamics for varying irregular waves, resulting in the maximum annual energy production. The first step of the two-step Dual Bayesian optimization determines the geometric layout of the array, which maximizes the first energy conversion to the total array excitation for irre

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Boel, Ekergård*1 &. Mats Leijon2 3. "TOLERANCE ANALYSIS OF A LINEAR WAVE POWER GENERATOR." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 9, no. 5 (2020): 85–89. https://doi.org/10.5281/zenodo.3828891.

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The world’s ever increasing demand for useful energy carriers have put a focus on the renewable energy conversion technologies. Numerous research groups have tried to convert the energy from the ocean waves and a series of concepts and techniques have over the years been developed. A research group at Uppsala University has designed a wave energy conversion system based on a linear permanent magnet generator, driven by a point absorbing buoy. This paper presents sensitivity analysis of the mechanical and magnetic design of the linear generator, performed to increases the knowledge of the

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Deka, P. N., and S. Gogoi. "The Wave Energy Up Conversion of Plasma Wave in Inhomogeneous Ionosphereic Plasma." Journal of Scientific Research 11, no. 3 (2019): 339–50. http://dx.doi.org/10.3329/jsr.v11i3.40982.

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Different types of instabilities are observed in the thermodynamically nonequilibrium Earth's ionosphere. Effective energy exchange process among waves may takes place through nonlinear interaction modes because of availability of free energy. We consider gradients in density and magnetic field is present in the system which support drift wave turbulence. In this study we concern on the wave energy up conversion of electrostatic nonresonant lower hybrid wave through plasma maser instability in the mid-altitude ionospheric region. We have formulated the growth rate of lower hybrid wave by Vlaso

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Zhang, W. C., H. X. Liu, X. W. Zhang, and L. Zhang. "Semi-Analytical Solution of Optimization on Moon-Pool Shaped WEC." Polish Maritime Research 23, s1 (2016): 25–31. http://dx.doi.org/10.1515/pomr-2016-0042.

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Abstract In order to effectively extract and maximize the energy from ocean waves, a new kind of oscillating-body WEC (wave energy converter) with moon pool has been put forward. The main emphasis in this paper is placed on inserting the damping into the equation of heaving motion applied for a complex wave energy converter and expressions for velocity potential added mass, damping coefficients associated with exciting forces were derived by using eigenfunction expansion matching method. By using surface-wave hydrodynamics, the exact theoretical conditions were solved to allow the maximum ener

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Abbas, Nawar, Michel Barbahan, Yako Kabrial, and Admoun Kabrial. "A Novel Approach to Wave Energy Conversion Using CFD Technique." Polish Maritime Research 31, no. 3 (2024): 113–25. http://dx.doi.org/10.2478/pomr-2024-0041.

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Abstract This article details the development and evaluation of a novel wave energy converter (WEC) aimed at efficiently capturing wave energy for electricity production. The study employs Computational Fluid Dynamics (CFD) techniques, specifically the URANS method and the k-ω SST turbulence model, to solve the Navier-Stokes equations and capture the free surface using the Volume of Fluid (VOF) model. The CFD results are validated against experimental data to ensure accuracy. Various design parameters of the proposed device were tested, revealing that the arms and bottom angle significantly af

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Jusoh, Mohd Afifi, Mohd Zamri Ibrahim, Muhamad Zalani Daud, Aliashim Albani, and Zulkifli Mohd Yusop. "Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review." Energies 12, no. 23 (2019): 4510. http://dx.doi.org/10.3390/en12234510.

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Ocean wave energy is one of the most abundant energy sources in the world. There is a wide variety of wave energy conversion systems that have been designed and developed, resulting from the different ways of ocean wave energy absorption and also depending on the location characteristics. This paper reviews and analyses the concepts of hydraulic power take-off (PTO) system used in various types of wave energy conversion systems so that it can be a useful reference to researchers, engineers and inventors. This paper also reviews the control mechanisms of the hydraulic PTO system in order to opt

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Ross, Robert S., T. N. Krishnamurti, S. Pattnaik, and A. Simon. "Energy Transformation and Diabatic Processes in Developing and Nondeveloping African Easterly Waves Observed during the NAMMA Project of 2006." Weather and Forecasting 24, no. 6 (2009): 1524–48. http://dx.doi.org/10.1175/2009waf2222235.1.

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Abstract This paper provides an understanding of essential differences between developing and nondeveloping African easterly waves, which was a major goal of NAMMA, NASA’s field program in the eastern Atlantic, which functioned as an extension of the African Monsoon Multidisciplinary Analysis (AMMA) program during 2006. Three NAMMA waves are studied in detail using FNL analysis: NAMMA wave 2, which developed into Tropical Storm Debby; NAMMA wave 7, which developed into Hurricane Helene; and NAMMA wave 4, which did not develop within the NAMMA domain. Diagnostic calculations are performed on th

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Olbers, Dirk, and Carsten Eden. "A Closure for Internal Wave–Mean Flow Interaction. Part I: Energy Conversion." Journal of Physical Oceanography 47, no. 6 (2017): 1389–401. http://dx.doi.org/10.1175/jpo-d-16-0054.1.

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AbstractWhen internal (inertia-)gravity waves propagate in a vertically sheared geostrophic (eddying or mean) flow, they exchange energy with the flow. A novel concept parameterizing internal wave–mean flow interaction in ocean circulation models is demonstrated, based on the description of the entire wave field by the wave-energy density in physical and wavenumber space and its prognostic computation by the radiative transfer equation. The concept enables a simplification of the radiative transfer equation with a small number of reasonable assumptions and a derivation of simple but consistent

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Ayub, Muhammad Waqas, Ameer Hamza, George A. Aggidis, and Xiandong Ma. "A Review of Power Co-Generation Technologies from Hybrid Offshore Wind and Wave Energy." Energies 16, no. 1 (2023): 550. http://dx.doi.org/10.3390/en16010550.

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Renewable energy resources such as offshore wind and wave energy are environmentally friendly and omnipresent. A hybrid offshore wind-wave energy system produces a more sustainable form of energy that is not only eco-friendly but also economical and efficient as compared to use of individual resources. The objective of this paper is to give a detailed review of co-generation technologies for hybrid offshore wind and wave energy. The proposed area of this review paper is based on the power conversions techniques, response coupling, control schemes for co-generation and complimentary generation,

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Kordmahale, Sina Baghbani, Jitae Do, Kuang-An Chang, and Jun Kameoka. "Low Cost and Piezoelectric based Soft Wave Energy Harvester." MRS Advances 4, no. 15 (2019): 889–95. http://dx.doi.org/10.1557/adv.2018.675.

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Abstract:Wave energy converters have been developed and commercialized in past decades; they have now faced numerous challenges of large volume sizes, environmental hazards, and high costs of deployment, components and maintenance. To address these challenges and make a wave energy converter practically available for various applications at a reasonable cost, we have developed a soft wave energy harvester that integrated low-cost soft material structures and piezoelectric-based Macro Fiber Composite (MFC). This integrated soft wave energy converter has a straightforward fabrication process and

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Jiang, Yannan, Jing Zhao, and Jiao Wang. "Reconfigurable Polarizer Based on Bulk Dirac Semimetal Metasurface." Crystals 10, no. 3 (2020): 228. http://dx.doi.org/10.3390/cryst10030228.

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In this paper, we propose a reflective polarizer in terahertz regime, which utilizes the Bulk-Dirac-Semimetal (BDS) metasurface can be dynamically tuned in broadband. The proposed polarizer is capable of converting the linear polarized wave into the circular polarized or the cross polarized waves by adjusting the Fermi energy (EF) of the BDS. In the frequency range of 0.51 THz and 1.06 THz, the incident linear polarized wave is converted into a circular polarized wave with an axial ratio (AR) less than 3 dB when EF = 30 meV. When EF = 45 meV, the cross-polarization conversion is achieved with

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Zeng, Yuehua. "Theory of scattered P- and S-wave energy in a random isotropic scattering medium." Bulletin of the Seismological Society of America 83, no. 4 (1993): 1264–76. http://dx.doi.org/10.1785/bssa0830041264.

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Abstract A new theory is presented to study the scattered elastic wave energy propagation in a random isotropic scattering medium. It is based on a scattered elastic wave energy equation that extends the work of Zeng et al. (1991) on multiple scattering by considering S to P and P to S wave scattering conversions. We obtain a complete solution of the scattered elastic wave energy equation by solving the equation in the frequency/wave-number domain. Using a discrete wave-number sum technique combined with a modified repeated averaging and the FFT method, we compute numerically the complete solu

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Zhang, Zhi-Lei, Shi-Feng Li, Xin Li, Xin-Ye Zou, and Jian-Chun Cheng. "Acoustic energy harvesting metasurface based on surface wave conversion." Applied Physics Letters 121, no. 3 (2022): 031701. http://dx.doi.org/10.1063/5.0097676.

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In this work, we propose and demonstrate an acoustic gradient metasurface with phase modulation that can convert the propagating waves into surface bounded waves for energy concentration. Due to the periodic design, multiple surface waves can form the standing wave in the case of normal incidence. Then, all piezoelectric composite sheets (PCSs) are placed in the antinode regions for acoustic energy harvesting and the output voltage of different PCS keeps the same phase. Numerical simulation and experimental results confirm that the sound pressure is 5 times larger than the incident waves, and

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Uno, Sachiyo, and Toshiki Iwasaki. "A Cascade-Type Global Energy Conversion Diagram Based on Wave–Mean Flow Interactions." Journal of the Atmospheric Sciences 63, no. 12 (2006): 3277–95. http://dx.doi.org/10.1175/jas3804.1.

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A cascade-type energy conversion diagram is proposed for the purpose of diagnosing the atmospheric general circulation based on wave–mean flow interactions. Mass-weighted isentropic zonal means facilitate the expression of nongeostrophic wave effects, conservation properties, and lower boundary conditions. To gain physical insights into energetics based on the nonacceleration theorem, the wave energy W is defined as the sum of the eddy available potential energy PE and the eddy kinetic energy KE. The mainstream of the energy cascade is as follows: The diabatic heating produces the zonal mean a

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Bernardi, Dominic, Yajie Yuan, and Alexander Y. Chen. "Alfvén Wave Conversion to Low Frequency Fast Magnetosonic Waves in Magnetar Magnetospheres." Astrophysical Journal 980, no. 2 (2025): 222. https://doi.org/10.3847/1538-4357/adabe5.

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Abstract Rapid shear motion of magnetar crust can launch Alfvén waves into the magnetosphere. The dissipation of the Alfvén waves has been theorized to power the X-ray bursts characteristic of magnetars. However, the process by which Alfvén waves convert their energy to X-rays is unclear. Recent work has suggested that energetic fast magnetosonic (fast) waves can be produced as a byproduct of Alfvén waves propagating on curved magnetic field lines; their subsequent dissipation may power X-ray bursts. In this work, we investigate the production of fast waves by performing axisymmetric force-fre

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Alaka, Ghassan J., and Eric D. Maloney. "The Intraseasonal Variability of African Easterly Wave Energetics." Journal of Climate 27, no. 17 (2014): 6559–80. http://dx.doi.org/10.1175/jcli-d-14-00146.1.

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Abstract African easterly waves (AEWs) and associated perturbation kinetic energy (PKE) exhibit significant intraseasonal variability in tropical North Africa during boreal summer. Consistent with East Africa (e.g., east of Lake Chad) being an initiation region for AEWs, previous studies have shown that increased East African PKE precedes and leads to increased West African AEW activity on intraseasonal time scales. In this study, reanalysis budgets of PKE and perturbation available potential energy (PAPE) are used to understand this behavior. The variability of PKE and PAPE sources is analyze

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Zheng, Xiong Bo, and Yu Nong Yang. "Research on the Hydrodynamic Performance of a Wave Energy Converter." Advanced Materials Research 986-987 (July 2014): 956–62. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.956.

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Under the pressure of fossil energy shortage, rational exploitation of ocean wave energy is propitious to establish an environmentally friendly society. This paper presents the results of a practical research done in a test tank, on the hydrodynamic performance of a wave energy converter with swing arms and floaters designed purposely. Fixed on a trailer, the converter was composed of two floaters, two swing arms, mechanical transmission devices and generators. The method of this research was to measure the floater’s acceleration and the output voltages of the generator under the movement of w

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Anh, Phan Huy Nam, Hyeung-Sik Choi, Dongwook Jung, Rouchen Zhang, Mai The Vu, and Hyunjoon Cho. "Design and Study of a New Wave Actuator for a Boat." Applied Sciences 15, no. 12 (2025): 6756. https://doi.org/10.3390/app15126756.

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The design and analysis of a new wave actuator for boats is presented in this paper. The wave actuator is installed beneath the boat hull and converts the hydrodynamic forces generated by rising waves on the boat into translational thrusting forces. The wave actuator consists of a flexible water tank, revolving springs, and inlet/outlet nozzles to enable passive wave-driven thrust generation without intermediate energy conversion. The compressed water in the tank of the wave actuator is expelled by the wave pressure exerted on the actuator, and the water thrust out of the nozzles propels the b

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Vicinanza, Diego, D. Stagonas, G. Müller, J. H. Nørgaard, and T. L. Andersen. "INNOVATIVE BREAKWATERS DESIGN FOR WAVE ENERGY CONVERSION." Coastal Engineering Proceedings 1, no. 33 (2012): 1. http://dx.doi.org/10.9753/icce.v33.structures.1.

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This paper intends contributing to an economically and environmentally sustainable development of coastal infrastructures by investigating the possibility of combining together breakwaters and Wave Energy Converters (WEC). The latter change the wave energy to electricity, which may serve both the rubble mound breakwaters and seawalls related activity and the energy demand of small human communities. Wave loadings and overtopping on a seawall and rubble mound breakwater with front reservoir are discussed on the basis of physical 2-D model tests carried out at University of Southampton (UK) and

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Shangguan, Liang, Kuan Lu, and Huamei Wang. "Research on Laboratory Test Method of Wave Energy Converter Wave-Wire Conversion Ratio in Irregular Waves." Energies 16, no. 2 (2023): 1001. http://dx.doi.org/10.3390/en16021001.

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The laboratory test of the wave energy converter model is an important means to evaluate the performance of the device. At present, there are few performance tests for complete specifications under the irregular wave. Referring to the test methods and standards at home and abroad, combined with the actual test work experience in the laboratory, using the irregular wave power calculation formula with the effective wave height and the spectral peak period as parameters, then the wave-wire conversion ratio test method of the wave energy converter physical model under irregular waves in the labora

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Wang, Changlei, Zirong Luo, Zhongyue Lu, Jianzhong Shang, Mangkuan Wang, and Yiming Zhu. "Design and CFD Analysis of the Energy Efficiency of a Point Wave Energy Converter Using Passive Morphing Blades." Energies 16, no. 1 (2022): 204. http://dx.doi.org/10.3390/en16010204.

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A wave energy converter features the ability to convert wave energy into the electrical energy required by unmanned devices, and its energy-conversion efficiency is an essential aspect in practical applications. This paper proposes a novel point-absorption wave energy converter with passive morphing blades to meet the demand for improved energy-conversion efficiency. We first introduce its concept and design, with its blades forming their shape by adaptive changes with the direction of the water flow. Next, the three-dimensional geometrical-morphing model, energy-conversion model, and energy-c

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