Relevant bibliographies by topics / Ocean wave energy converter

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  2. Dissertations / Theses
  3. Books
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Academic literature on the topic 'Ocean wave energy converter'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Ocean wave energy converter"

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Foerd Ames, P. "4672222 Ocean wave energy converter." Deep Sea Research Part B. Oceanographic Literature Review 34, no. 11 (January 1987): 1016. http://dx.doi.org/10.1016/0198-0254(87)91156-3.

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Satriawan, Muhammad, L. Liliasari, Wawan Setiawan, and Ade Gafar Abdullah. "Unlimited Energy Source: A Review of Ocean Wave Energy Utilization and Its Impact on the Environment." Indonesian Journal of Science and Technology 6, no. 1 (January 19, 2021): 1–16. http://dx.doi.org/10.17509/ijost.v6i1.31473.

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This paper aims to review the potential of wave energy in several countries, the wave energy converter technology that has been developed, and the impact of the installation of wave energy converter technology devices on the environment. In addition, it discusses the theoretical formulations and challenges in the development of energy converter technology in the future. Based on the detail analysis, the potential of ocean wave energy for alternative energy is very large but cannot be used optimally because the technology of wave energy converter that has been developed is still on a prototype scale. In addition, the impact of the use of ocean wave converters on the environment is insignificant compared with conventional energy. Finally, this study informs and recommends the government and the private sector to start investing in the ocean wave energy industry optimally in order to achieve a sustainable future.
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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 (May 2, 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 regular waves with time domain method. The results show that the nonlinear wave energy converter has higher conversion efficiency than the linear wave energy converter more than the natural frequency state. The conversion efficiency of the nonlinear wave energy converter in the low frequency state is closed to the linear converter. The amplitude of the incident wave, the damping of the nonlinear wave energy converter and the nonlinear parameter [Formula: see text] affect the energy capture performance of the wave energy converter.
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Satriawan, Muhammad, and Rosmiati Rosmiati. "Simple Floating Ocean Wave Energy Converter: Developing Teaching Media to Communicating Alternative Energy." JPPS (Jurnal Penelitian Pendidikan Sains) 12, no. 1 (November 27, 2022): 1–13. http://dx.doi.org/10.26740/jpps.v12n1.p1-13.

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Research aims to develop teaching media in communicating alternative energy to students who are in high school. The teaching media developed as a prototype converter of ocean wave energy into electrical energy. This Converter is focused on helping students understand concepts and technologies in utilizing ocean wave energy as an alternative energy source. The development stage adopted the ADDIE model, which is limited to the analysis, design, and development stages. The data obtained are in the form of design validation data, trial data, and product assessment data. The data were analyzed using descriptive statistics. Based on the results of data analysis, it is found that (1) the converter design is feasible to be developed with a few additions to the transmission section to produce higher RPM; (2) the resulting converter functions correctly with the output voltage of 5 to 9 volts in the artificial wave pool test and reaches 8 to 12 volts; (3) for product assessment, it was found that the Converter produced was suitable to be used as a teaching medium to communicate concepts and technology in utilizing ocean wave energy as an alternative energy source. So, teaching media in the form of a wave energy converter could be used as an alternative to communicating the concept of using ocean waves as an alternative energy source. The implication of this research is that it can be used as a model or initial example in developing learning media related to alternative energy and can even be used as a model in developing converters on a larger scale so that the wider community can use them.
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Aderinto, Tunde, and Hua Li. "Conceptual Design and Simulation of a Self-Adjustable Heaving Point Absorber Based Wave Energy Converter." Energies 13, no. 8 (April 17, 2020): 1997. http://dx.doi.org/10.3390/en13081997.

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Different concepts and methods have been proposed and developed by many researchers to harvest ocean wave energy. In this paper, a new self-adjustable wave energy converter concept is presented, which changes its inertia through ballasting and de-ballasting using sea water. The trigger of ballasting and de-ballasting is controlled by the critical wave period. Therefore, the self-adjustable wave energy converter is able to interact at resonance with the ocean waves at two different resonant bandwidths. Ten years real wave data with hourly resolution from a selected location in Gulf of Mexico was used in this paper to decide the critical wave period and other parameters of the wave energy converter. The annual energy performance of the self-adjustable wave energy converter was also estimated and compared with non-adjustable wave energy converter with similar dimensions. Structural analysis including both static and fatigue analysis was performed on the self-adjustable wave energy converter to determine its survivability with the real ocean wave data. The results show that the self-adjustable wave energy converter is able to capture more energy than non-adjustable wave energy converter, and is able to survive during the hash ocean wave conditions.
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Chitale, Kedar, Casey Fagley, Ali Mohtat, and Stefan Siegel. "Numerical Evaluation of Climate Scatter Performance of a Cycloidal Wave Energy Converter." International Marine Energy Journal 5, no. 3 (December 19, 2022): 315–26. http://dx.doi.org/10.36688/imej.5.315-326.

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Ocean waves offer an uninterrupted, rich resource of globally available renewable energy. However, because of their high cost and low power production, commercial wave energy converters are not operational at present. In this paper, we numerically evaluated the performance of a novel feedback-controlled lift-based cycloidal wave energy converter (CycWEC) at various sea states of the Humboldt Bay wave climate. The device comprised of two hydrofoils attached eccentrically to a shaft at a radius, submerged at a distance under the ocean surface. The pitch of the blades was feedback-controlled based on estimation of the incoming wave. The simulations were performed for regular waves and irregular waves approximated with a JONSWAP spectrum. Climate data from Humboldt Bay, CA was used to estimate the yearly power generation. The results underline the importance of a well-tuned control algorithm to maximize the annual energy production. The estimated annual energy production of the CycWEC was 3000MWh from regular wave simulations and 1800MWh from irregular wave simulations, showing that it can be a commercially viable means of electricity production from ocean waves.
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Mohtat, Ali, Casey Fagley, Kedar C. Chitale, and Stefan G. Siegel. "Efficiency analysis of the cycloidal wave energy convertor under real-time dynamic control using a 3D radiation model." International Marine Energy Journal 5, no. 1 (June 14, 2022): 45–56. http://dx.doi.org/10.36688/imej.5.45-56.

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Ocean waves provide a vast, uninterrupted resource of renewable energy collocated around large coastal population centers. Clean energy from ocean waves can contribute to the local electrical grid without the need for long-term electrical storage, yet due to the current high cost of energy extraction from ocean waves, there is no commercial ocean wave farm in operation. One of the wave energy converter (WEC) device classes that show the potential to enable economic energy generation from ocean waves is the class of wave terminators. This work investigates the Cycloidal Wave Energy Converter (CycWEC), which is a one-sided, lift-based wave terminator operating with coupled hydrofoils. The energy that the CycWEC extracted from ocean waves was estimated using a control volume analysis model of the 3D wave field in the presence of the CycWEC. The CycWEC was operated under feedback control to extract the maximum amount of energy possible from the incoming waves, and the interaction with different incoming regular, irregular, and short crested waves was examined.
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Curto, Domenico, Vincenzo Franzitta, and Andrea Guercio. "Sea Wave Energy. A Review of the Current Technologies and Perspectives." Energies 14, no. 20 (October 13, 2021): 6604. http://dx.doi.org/10.3390/en14206604.

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The proposal of new technologies capable of producing electrical energy from renewable sources has driven research into seas and oceans. Research finds this field very promising in the future of renewable energies, especially in areas where there are specific climatic and morphological characteristics to exploit large amounts of energy from the sea. In general, this kind of energy is referred to as six energy resources: waves, tidal range, tidal current, ocean current, ocean thermal energy conversion, and saline gradient. This review has the aim to list several wave-energy converter power plants and to analyze their years of operation. In this way, a focus is created to understand how many wave-energy converter plants work on average and whether it is indeed an established technology.
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Darwish, Ahmed, and George A. Aggidis. "A Review on Power Electronic Topologies and Control for Wave Energy Converters." Energies 15, no. 23 (December 3, 2022): 9174. http://dx.doi.org/10.3390/en15239174.

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Ocean energy systems (OESs) convert the kinetic, potential, and thermal energy from oceans and seas to electricity. These systems are broadly classified into tidal, wave, thermal, and current marine systems. If fully utilized, the OESs can supply the planet with the required electricity demand as they are capable of generating approximately 2 TW of energy. The wave energy converter (WEC) systems capture the kinetic and potential energy in the waves using suitable mechanical energy capturers such as turbines and paddles. The energy density in the ocean waves is in the range of tens of kilowatts per square meter, which makes them a very attractive energy source due to the high predictability and low variability when compared with other renewable sources. Because the final objective of any renewable energy source (RES), including the WECs, is to produce electricity, the energy capturer of the WEC systems is coupled with an electrical generator, which is controlled then by power electronic converters to generate the electrical power and inject the output current into the utility AC grid. The power electronic converters used in other RESs such as photovoltaics and wind systems have been progressing significantly in the last decade, which improved the energy harvesting process, which can benefit the WECs. In this context, this paper reviews the main power converter architectures used in the present WEC systems to aid in the development of these systems and provide a useful background for researchers in this area.
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Nicola, Pozzi, Bracco Giovanni, Passione Biagio, Sirigu Sergej Antonello, Vissio Giacomo, Mattiazzo Giuliana, and Sannino Gianmaria. "Wave Tank Testing of a Pendulum Wave Energy Converter 1:12 Scale Model." International Journal of Applied Mechanics 09, no. 02 (March 2017): 1750024. http://dx.doi.org/10.1142/s1758825117500247.

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Wave Energy is a widespread, reliable renewable energy source. The early study on Wave Energy dates back in the 70’s, with a particular effort in the last and present decade to make Wave Energy Converters (WECs) more profitable and predictable. The PeWEC (Pendulum Wave Energy Converter) is a pendulum-based WEC. The research activities described in the present work aim to develop a pendulum converter for the Mediterranean Sea, where waves are shorter, thus with a higher frequency compared to the ocean waves, a characteristic well agreeing with the PeWEC frequency response. The mechanical equations of the device are developed and coupled with the hydrodynamic Cummins equation. The work deals with the design and experimental tank test of a 1:12 scale prototype. The experimental data recorded during the testing campaign are used to validate the numerical model previously described. The numerical model proved to be in good agreement with the experiments.
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Dissertations / Theses on the topic "Ocean wave energy converter"

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Waters, Rafael. "Energy from Ocean Waves : Full Scale Experimental Verification of a Wave Energy Converter." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9404.

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A wave energy converter has been constructed and its function and operational characteristics have been thoroughly investigated and published. The wave energy converter was installed in March of 2006 approximately two kilometers off the Swedish west coast in the proximity of the town Lysekil. Since then the converter has been submerged at the research site for over two and a half years and in operation during three time periods for a total of 12 months, the latest being during five months of 2008. Throughout this time the generated electricity has been transmitted to shore and operational data has been recorded. The wave energy converter and its connected electrical system has been continually upgraded and each of the three operational periods have investigated more advanced stages in the progression toward grid connection. The wave energy system has faced the challenges of the ocean and initial results and insights have been reached, most important being that the overall wave energy concept has been verified. Experiments have shown that slowly varying power generation from ocean waves is possible. Apart from the wave energy converter, three shorter studies have been performed. A sensor was designed for measuring the air gap width of the linear generator used in the wave energy converter. The sensor consists of an etched coil, a search coil, that functions passively through induction. Theory and experiment showed good agreement. The Swedish west coast wave climate has been studied in detail. The study used eight years of wave data from 13 sites in the Skagerrak and Kattegatt, and data from a wave measurement buoy located at the wave energy research site. The study resulted in scatter diagrams, hundred year extreme wave estimations, and a mapping of the energy flux in the area. The average energy flux was found to be approximately 5.2 kW/m in the offshore Skagerrak, 2.8 kW/m in the near shore Skagerrak, and 2.4 kW/m in the Kattegat. A method for evaluating renewable energy technologies in terms of economy and engineering solutions has been investigated. The match between the technologies and the fundamental physics of renewable energy sources can be given in terms of the technology’s utilization. It is argued that engineers should strive for a high utilization if competitive technologies are to be developed.
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Rahm, Magnus. "Ocean Wave Energy : Underwater Substation System for Wave Energy Converters." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112915.

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This thesis deals with a system for operation of directly driven offshore wave energy converters. The work that has been carried out includes laboratory testing of a permanent magnet linear generator, wave energy converter mechanical design and offshore testing, and finally design, implementation, and offshore testing of an underwater collector substation. Long-term testing of a single point absorber, which was installed in March 2006, has been performed in real ocean waves in linear and in non-linear damping mode. The two different damping modes were realized by, first, a resistive load, and second, a rectifier with voltage smoothing capacitors and a resistive load in the DC-link. The loads are placed on land about 2 km east of the Lysekil wave energy research site, where the offshore experiments have been conducted. In the spring of 2009, another two wave energy converter prototypes were installed. Records of array operation were taken with two and three devices in the array. With two units, non-linear damping was used, and with three units, linear damping was employed. The point absorbers in the array are connected to the underwater substation, which is based on a 3 m3 pressure vessel standing on the seabed. In the substation, rectification of the frequency and amplitude modulated voltages from the linear generators is made. The DC voltage is smoothened by capacitors and inverted to 50 Hz electrical frequency, transformed and finally transmitted to the on-shore measuring station. Results show that the absorption is heavily dependent on the damping. It has also been shown that by increasing the damping, the standard deviation of electrical power can be reduced. The standard deviation of electrical power is reduced by array operation compared to single unit operation. Ongoing and future work include the construction and installation of a second underwater substation, which will connect the first substation and seven new WECs.
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Du, Plessis Jacques. "A hydraulic wave energy converter." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19950.

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Thesis (MScEng)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: As a renewable energy source, wave energy has the potential to contribute to the increasing global demand for power. In South Africa specifically, the country’s energy needs may easily be satisfied by the abundance of wave energy at the South-West coast of the country. Commercially developing and utilizing wave energy devices is not without its challenges, however. The ability of these devices to survive extreme weather conditions and the need to achieve cost-efficacy while achieving high capacity factors are but some of the concerns. Constant changes in wave heights, lengths and directions as well as high energy levels and large forces during storm conditions often lead to difficulties in keeping the complexity of the device down, avoiding over-dimensioning and reaching high capacity factors. The point absorber device developed as part of this research is based on an innovation addressing the abovementioned issues. An approach is followed whereby standard "offthe- shelf" components of a proven hydraulics technology are used. The size of the device is furthermore adaptable to different wave climates, and the need for a control system is not necessary if the design parameters are chosen correctly. These characteristics enable low complexity of the device, excellent survivability and an exceptionally high capacity factor. This may lead to low capital as well as low operationand maintenance costs. In this paper the working principle of this concept is presented to illustrate how it utilises the available wave energy in oceans. The results obtained from theoretical tests correlate well with the experimental results, and it is proven that the device has the ability to achieve high capacity factors. As the device makes use of existing, "off-the-shelf" components, cost-efficient energy conversion is therefore made feasible through this research.
AFRIKAANSE OPSOMMING: As ’n hernubare/ herwinbare energiebron bied golfenergie die potensiaal om by te dra tot die bevrediging van die stygende globale energie-navraag. In spesifiek Suid-Afrika kan die oorvloed van beskikbare golfenergie aan die Suid-Weskus van die land gebruik word om aan die land se energiebehoeftes te voldoen. Betroubaarheid en oorlewing in erge weerstoestande, koste-effektiwiteit en die behaal van hoë kapasiteitsfaktore is beduidende struikelblokke wat oorkom moet word in die poging om ’n golfenergie-omsetter wat kommersieël vervaardig kan word, te ontwikkel. Daarby dra voortdurende veranderings in golfhoogtes, -lengtes en -rigtings sowel as hoë energievlakke en groot kragte tydens storms by to die feit dat dit moeilik is om die kompleksiteit van die stelsel laag te hou. Dit terwyl daar voorkom moet word dat die toestel oorontwerp en verhoed word dat hoë kapsiteitsfaktore bereik word. Die puntabsorbeerder-toestel wat in hierdie navorsing ontwikkel is, bestaan uit ’n ontwerp wat spesifiek ontwikkel is om die bogenoemde probleme aanspreek. ’n Unieke benadering is gevolg waardeur standaard, maklik-bekombare komponente gebruik is en die komponent-groottes ook aangepas kan word volgens golfgroottes. Indien die ontwerpsdimensies akkuraat gekies word, is die moontlikheid verder goed dat ’n beheerstelsel nie geïmplementeer hoef te word nie. Hierdie eienskappe verseker lae stelselkompleksiteit, uitstekende oorlewingsvermoë en ’n uitstaande kapasiteitsfaktor. Lae kapitaal- sowel as onderhoudskostes is dus moontlik. Die doel van hierdie dokument is om die werking van die konsep voor te stel en teoreties sowel as prakties te evalueer. Die resultate van teoretiese toetse stem goed ooreen met eksperimentele resultate, en dit is duidelik dat die toestel hoë kapasiteitsfaktore kan behaal. Aangesien die toestel verder gebruik maak van bestaande komponente wat alledaags beskikbaar is, word die koste-effektiewe omsetting van golfenergie dus moontlik gemaak deur hierdie navorsing.
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Greenwood, Charles. "The impact of large scale wave energy converter farms on the regional wave climate." Thesis, University of the Highlands and Islands, 2016. https://pure.uhi.ac.uk/portal/en/studentthesis/the-impact-of-large-scale-wave-energy-converter-farms-on-the-regional-wave-climate(e734db00-2108-48f9-b162-a1fc85ef61d6).html.

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Eriksson, Carolina. "Model Predictive Control of CorPower Ocean Wave Energy Converter." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196859.

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Wave power is currently a hot topic of research, and has shown great potential as a renewable energy source. There have been lot of progress made in developing cost effective Wave Energy Converters (WECs) that can compete with other sources of energy in regard to price and electrical power. Theoretical studies has shown that optimal control can increase the generated power for idealized WECs. This thesis is done in collaboration with CorPower Ocean, and investigates the use of economic Model Predictive Control (MPC) to control the generator torque in a light, point-absorbing, heaving WEC that is currently under development. The objective is to optimize the generator torque, such that the average generated power is maximized while maintaining a small ratio between maximum and average generated power. This results in a nonconvex cost function. Due to the highly nonlinear and nonsmooth dynamics of the WEC, two controllers are proposed. The first controller consists of a system of linear MPCs, and the second controller is a nonlinear MPC. Relevant forces acting on the WEC are identified and the system dynamics are modelled from a force perspective. The models are discretized and the controllers are implemented in Simulink. The WEC, together with the controllers, is simulated in an extensive Simulink model developed by CorPower Ocean. Several different types of ocean waves are considered, such as its energy content and its regularity. In the majority of cases, the controllers do not increase the performance of the WEC compared to a simple, well tuned controller previously developed by CorPower Ocean. Finally, possible improvements of how to reduce existing model errors are proposed.
Vågkraft har de senaste åren visat stor potential som en ny, förnyelsebar energikälla. Det har skett många framsteg inom området med att ta fram ett robust vågkraftsverk som kan utmana andra energikällor i pris och elektrisk effekt. Teoretiska studier har visat att optimal styrning kan öka den elektriska effekten för idialiserade vågkraftsverk. Denna rapport är skriven i sammarbete med vågkraftföretaget CorPower Ocean, och undersöker hur ekonomisk Model Predictive Control (MPC) kan användas för att styra dämpningen i ett lätt vågkraftverk vars storlek är relativt liten våglängden. Målet är att optimera dämpningen, vridmomentet, i generatorerna så att medeleffekten maximeras samtidigt som toppeffekten minimeras, detta för att skapa ett stabilare system med mindre flutuationer mellan medel- och toppeffekt. För att nå detta mål krävs en icke konvex kostfunktion. På grund av stora olinjäriteter och diskontinuteter i systemets dynamik utvecklas två regulatorer; ett system av linjära MPC, samt en olijär MPC. Relevanta krafter som påverkar systemet identifieras och modelleras från ett kraftperspektiv. Modellerna diskretiseras, och regulatorerna implementeras och simuleras i en detaljerad Simulink modell av systemet, utvecklad av CorPower Ocean. Både regelbundna och oregelbunda vågset med varierande energiinnehåll har simuleras. Regulatorerna ökar inte vågkraftverkets prestanda jämfört med en enkel, väl inställd regulator utveklad av CorPower Ocean. Slutligen föreslås förbättringar för att minska modelfell i modellerna.
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Magagna, Davide. "Oscillating water column wave pump : a wave energy converter for water delivery." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/349009/.

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The research presented in this dissertation investigates the development and the performances of a new type of Wave Energy Converter (WEC) aimed to provide water delivery and energy storage in the form of potential energy. The Oscillating Water Column Wave Pump (OWCP) concept was proposed and tested through a series of experimental investigations supported by scientific theory. The OWCP was developed after an extensive study of the existing wave energy technology available, from which it emerged that the Oscillating Water Column (OWC) device could be further implemented for water delivery purposes. The existing theory of the OWC was employed to develop a mathematical theory able to describe the system wave response and water removal of the OWCP. In order to understand and validate the mathematical models of the OWCP, experimental investigations were carried out under the influence of incident linear waves in a two-dimensional (2D) and three-dimensional (3D) wave flume. The experimental equipment and methodology are outlined, including the description of wave flumes, models and data acquisition equipment. Experimental tests were used to verify the concept of the OWCP and assess its performances, investigating both the response of the device to the waves with and without water removal. In order to increase the efficiencies of delivery, array configurations of multiple OWCPs were adopted. The research demonstrated that up to 14% of the energy carried by the incoming waves can be converted into useful potential energy for a single device. Moreover a further increase of the efficiencies can be obtained with the array configuration improving the overall capability of the OWCP, for optimal separation distance between the array components. Further model tests are required to extended this research to validate the developed mathematical models as an effective prediction tool of the performances of the OWCP and further increase the efficiency of water removal that can be achieved.
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Kanagaraj, Gireesha. "Modelling of the Novi Ocean Wave Energy Converter using WEC-Sim." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445865.

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Sarmah, Biki. "Optimisation of Electromechanical Drivetrain for Wave Energy Converter at CorPower Ocean AB." Thesis, KTH, Fordonsdynamik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234838.

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The potential of wave energy has been constantly explored in past couple of years. The contribution from the CorPower Ocean AB towards the development of wave energy is important. This thesis involves the detailed study of current ½ scale (1:2) model of a Wave Energy converter (WEC) and computing the results to find the optimised component ratings. The primary goal of the thesis is to optimise each component of the electro-mechanical drivetrain with the assistance of modelling software Simulink and Matlab. In the initial stage of this thesis the generator and drive component are analysed without changing the drivetrain configuration of the WEC. A method is established to find suitable ratings of generator and drive system for the WEC which provides high system efficiency and power output. The method is developed in such a way that it can be implemented for any scale model whether it is full-scale or half-scale. Once finding the optimised ratings of generator and drive combination, different configuration of the drivetrain is explored for the WEC. The influence of drivetrain mechanism with and without flywheel is also considered and compared with the ½ scale model. The drivetrain configurations comprise of single generator, double generator and quadruple generator alignment with the WEC.  All configurations of the generator are compared with and without a flywheel in the drivetrain. The benefit of including a flywheel involves power smoothing, control simplification and reducing component volume, whereas the benefit of not including flywheel includes better hydrodynamic damping and control. The outcome of the results showcase that the existing ½ scale WEC model can provide better performance when the generator ratings are reduced because of low speed at small sea state. The speed-ratio of the gearbox can either be increased or a new system can be introduced which chooses the generator rating depending on the sea state and motion profile. Based on the analysis result of an optimised ½ scale model, the full scale drivetrain component ratings are introduced with a different drivetrain topology. Results from the Full scale WEC model showcase that a double generator WEC configuration without a flywheel is a reliable and efficient solution for CorPower Ocean AB.
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Engström, Jens. "Hydrodynamic Modelling for a Point Absorbing Wave Energy Converter." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160319.

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Surface gravity waves in the world’s oceans contain a renewable source of free power on the order of terawatts that has to this date not been commercially utilized. The division of Electricity at Uppsala University is developing a technology to harvest this energy. The technology is a point absorber type wave energy converter based on a direct-driven linear generator placed on the sea bed connected via a line to a buoy on the surface. The work in this thesis is focused mainly on the energy transport of ocean waves and on increasing the transfer of energy from the waves to the generator and load. Potential linear wave theory is used to describe the ocean waves and to derive the hydrodynamic forces that are exerted on the buoy. Expressions for the energy transport in polychromatic waves travelling over waters of finite depth are derived and extracted from measured time series of wave elevation collected at the Lysekil test site. The results are compared to existing solutions that uses the simpler deep water approximation. A Two-Body system wave energy converter model tuned to resonance in Swedish west coast sea states is developed based on the Lysekil project concept. The first indicative results are derived by using a linear resistive load. The concept is further extended by a coupled hydrodynamic and electromagnetic model with two more realistic non-linear load conditions. Results show that the use of the deep water approximation gives a too low energy transport in the time averaged as well as in the total instantaneous energy transport. Around the resonance frequency, a Two-Body System gives a power capture ratio of up to 80 percent. For more energetic sea states the power capture ratio decreases rapidly, indicating a smoother power output. The currents in the generator when using the Two-Body system is shown to be more evenly distributed compared to the conventional system, indicating a better utilization of the electrical equipment. Although the resonant nature of the system makes it sensitive to the shape of the wave spectrum, results indicate a threefold increase in annual power production compared to the conventional system.
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Nie, Zanxiang Jack. "Emulation and power conditioning of outputs from a direct drive linear wave energy converter." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609008.

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Books on the topic "Ocean wave energy converter"

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Cruz, Joao, ed. Ocean Wave Energy. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-74895-3.

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Samad, Abdus, S. A. Sannasiraj, V. Sundar, and Paresh Halder, eds. Ocean Wave Energy Systems. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-78716-5.

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Pecher, Arthur, and Jens Peter Kofoed, eds. Handbook of Ocean Wave Energy. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39889-1.

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1940-, Evans D. V., Falcão, A. F. de O. 1937-, and International Union of Theoretical and Applied Mechanics., eds. Hydrodynamics of ocean wave-energy utilization. Berlin: Springer-Verlag, 1986.

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Mishra, Sunil Kumar, Dusmanta Kumar Mohanta, Bhargav Appasani, and Ersan Kabalcı. OWC-Based Ocean Wave Energy Plants. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9849-4.

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Evans, David V., and António F. O. de Falcão, eds. Hydrodynamics of Ocean Wave-Energy Utilization. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82666-5.

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Tony, Lewis. Wave energy: Evaluation for C.E.C. London: Published by Graham & Trotman for the Commission of the European Communities, 1985.

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Bank, Asian Development, ed. Wave energy conversion and ocean thermal energy conversion potential in developing member countries. Mandaluyong City, Metro Manila, Philippines: Asian Development Bank, 2014.

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Kane, Mike. Summary of PIER-funded wave energy research. [Sacramento, Calif.]: California Energy Commission, 2008.

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Kane, Mike. Summary of PIER-funded wave energy research. [Sacramento, Calif.]: California Energy Commission, 2008.

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Book chapters on the topic "Ocean wave energy converter"

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Sheng, Wanan. "Wave Energy Converters." In Encyclopedia of Ocean Engineering, 1–9. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-6963-5_187-1.

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Sheng, Wanan. "Wave Energy Converters." In Encyclopedia of Ocean Engineering, 2121–28. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-10-6946-8_187.

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Sundar, V., and S. A. Sannasiraj. "Wave Energy Convertors." In Ocean Wave Energy Systems, 19–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_2.

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Bellamy, N. W. "The Circular Sea Clam Wave Energy Converter." In Hydrodynamics of Ocean Wave-Energy Utilization, 69–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82666-5_5.

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Nielsen, Kim. "On the Experimental Investigation of a Wave Power Converter." In Hydrodynamics of Ocean Wave-Energy Utilization, 93–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82666-5_7.

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Suchithra, R., and Abdus Samad. "Control of Wave Energy Converters." In Ocean Wave Energy Systems, 471–86. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_16.

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Vijayasankar, Vishnu, Tapas K. Das, Paresh Halder, and Abdus Samad. "Power Take-Off Devices for Wave Energy Converters." In Ocean Wave Energy Systems, 355–64. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_11.

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Venugopal, Vengatesan, Zhi Yung Tay, and Tirumaleswara Reddy Nemalidinne. "Numerical Modelling Techniques for Wave Energy Converters in Arrays." In Ocean Wave Energy Systems, 281–322. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_9.

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Blanco, Marcos, Jorge Torres, Miguel Santos-Herrán, Luis García-Tabarés, Gustavo Navarro, Jorge Nájera, Dionisio Ramírez, and Marcos Lafoz. "Recent Advances in Direct-Drive Power Take-Off (DDPTO) Systems for Wave Energy Converters Based on Switched Reluctance Machines (SRM)." In Ocean Wave Energy Systems, 487–532. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_17.

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AbstractThis chapter is focused on Power Take-Off (PTO) systems for wave energy converters (WEC), being one of the most important elements since PTOs are responsible to transform the mechanical power captured from the waves into electricity. It presents Direct-Drive PTO (DDPTO) as one of the most reliable solutions to be adapted to some particular types of WEC, such as point absorbers. A discussion about modularity and adaptability, together with intrinsic characteristics of direct-drive PTOs, is also included. Among the different technologies of electric machines that can be used in direct-drive linear PTOs, switched reluctance machines (SRM) are described in further detail. In particular, the Azimuthal Multi-translator SRM is presented as a suitable solution in order to increase power density and reduce costs. Not only the electric machine, but also the associated power electronics are described in detail. The description includes the different configurations and topologies of power converters and the most appropriate control strategies. Finally, a superconducting linear generator solution is described, presenting it as a reliable alternative for the application of direct-drive PTOs. An example of concept and preliminary design is included in order to highlight the main challenges to be faced during this process.
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Das, Tapas K., and Abdus Samad. "Wells Turbine as a Power Take-Off Mechanism for Wave Energy Converters." In Ocean Wave Energy Systems, 365–96. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_12.

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Conference papers on the topic "Ocean wave energy converter"

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Liang, Changwei, Junxiao Ai, and Lei Zuo. "Design, Fabrication, Simulation and Testing of a Novel Ocean Wave Energy Converter." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9444.

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The total useful wave resource around the world is estimated to be larger than 2 TW. Harvesting a small portion of the available wave energy resource could contribute significantly to meet the urgent energy demand. Therefore, a lot of wave energy converters have been developed in the past decades. Traditionally, air turbine, hydroelectric motor and linear electromagnetic motor are used in wave energy converters as the power takeoff system. Although these power takeoffs have their own advantages, power takeoffs are still recognized as the most important challenge in ocean wave energy technology. In this paper, a mechanical motion rectifier (MMR) based power takeoff system is proposed and prototyped for wave energy converter. This power takeoff system can convert the bi-directional wave motion into unidirectional rotation of the generator by integrating two one-way clutches into a rack pinion system. A 500W prototype which contains a heaving buoy and MMR-based power takeoff system was designed and fabricated. The models of power takeoff system and the corresponding single-buoy wave energy converter are built and analyzed. Lab testing of power takeoff mechanism and ocean testing of the overall ocean wave converter system are also conducted.
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Murakami, Hidenori, Oscar Rios, and Ardavan Amini. "A Mathematical Model With Preliminary Experiments of a Gyroscopic Ocean Wave Energy Converter." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51163.

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Global attempts to increase generation of clean and reproducible natural energy have greatly contributed to the progress of solar, wind, biomass, and geothermal energy generation. To meet the goal set by the Renewable Portfolio Standards (RPS) in the United States, it is advisable for several of the coastal states to tap into the least explored resource: ocean-wave energy. There are many advantages to ocean-wave energy generation. First, the energy per unit area is 20 to 30 times larger compared with solar and five to ten times larger when compared to wind energy. Second, waves are more easily predicted than wind. Currently, there are several challenges with capturing ocean energy: With respect to the environment, noise pollution and effects on marine life need to be taken into consideration; with respect to design, ocean-wave power generators need to withstand large waves due to hurricanes and be designed to lessen visual pollution. There are various methods and devices used to capture ocean wave energy. Point absorbers, such as PowerBuoy, can harness vertical or heaving motion into electricity while attenuators like Pelamis use the induced movement of its joints from the incoming waves. Unfortunately, many have few parameters that can be varied to optimize power generation and or suffer from the various challenges mentioned above. The gyroscopic ocean wave energy converter harnesses the rocking or pitching motion induced by the ocean waves and converts it into rotary motion that is then fed to a generator. Furthermore, it is a fully enclosed floating device that has several parameters that can be varied to optimize power output. Previous work has demonstrated the viability of such a device, but the theoretical modeling of these converters is still in its infancy compared to that of other ocean wave energy converters. The objective of the research presented is to fully understand the mechanisms of power generation in the gyroscopic ocean wave energy converter. Using the moving frame method, a mathematical model of the device is developed. The nonlinear equations of motion are derived through the use of this novel method and then solved numerically. The results are then used to optimize the system and identify key parameters and their effect on the output power generated. Additionally, the resulting equations serve as a tool for identifying an appropriate control strategy for the system. Finally, a scale model of a gyroscopic ocean wave energy converter is developed to validate the equations of motion that have been derived.
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Peng, Wei, and Junwei Ma. "Experimental Investigation on Hydrodynamic Effectiveness of a Wave Energy Converter Using Floating Breakwater." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19029.

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Abstract Wave energy is favored by more and more people because of its wide distribution, pollution-free, renewable and many other advantages. Among numerous wave energy converting devices, the converters using floating breakwaters are recognized to be quite promising as the construction and maintenance cost can be shared. In this study, a shoreline wave energy converter (WEC) is proposed which consists of a floating breakwater arranged along the wave direction and restricted to only have vertical degree of motion. Making use of the motion of breakwaters, a dynamo is able to convert the wave power to electricity. At the same time, the incoming waves can be attenuated due to the complex interaction between waves and the floating structure. A scale model was built in the laboratory at Hohai University, and then employed to investigate the performance of developed wave energy device. In the physical model, dynamos and resistance were employed as the power take-off (PTO) system, and the instantaneous output power could be calculated using the measured data. Experimental results show that the resonance state of float plays an important role for the wave energy extraction, and the hydrodynamic efficiency of the device under the resonance state can be up to 41.8% for single breakwater, counting in the internal energy converted by the dissipative force. When subjected to shorter waves, the PTO damping encourages the wave reflection; whereas, more wave energy is dissipated or transformed to power for longer waves. Meanwhile, the PTO damping is also a negative factor for the wave overtopping reduction as the motion of float may be restrained considerably. Last but not the least, the PTO load is proved to be a significant parameter for the optimization the output power, and a strategy must be found to achieve the best power conversion under the dominant wave conditions.
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Katsidoniotaki, Eirini, Edward Ransley, Scott Brown, Johannes Palm, Jens Engström, and Malin Göteman. "Loads on a Point-Absorber Wave Energy Converter in Regular and Focused Extreme Wave Events." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18639.

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Abstract Accurate modeling and prediction of extreme loads for survivability is of crucial importance if wave energy is to become commercially viable. The fundamental differences in scale and dynamics from traditional offshore structures, as well as the fact that wave energy has not converged around one or a few technologies, implies that it is still an open question how the extreme loads should be modeled. In recent years, several methods to model wave energy converters in extreme waves have been developed, but it is not yet clear how the different methods compare. The purpose of this work is the comparison of two widely used approaches when studying the response of a point-absorber wave energy converter in extreme waves, using the open-source CFD software OpenFOAM. The equivalent design-waves are generated both as equivalent regular waves and as focused waves defined using NewWave theory. Our results show that the different extreme wave modeling methods produce different dynamics and extreme forces acting on the system. It is concluded that for the investigation of point-absorber response in extreme wave conditions, the wave train dynamics and the motion history of the buoy are of high importance for the resulting buoy response and mooring forces.
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Siegel, Stefan G., Tiger Jeans, and Thomas McLaughlin. "Intermediate Ocean Wave Termination Using a Cycloidal Wave Energy Converter." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20030.

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We investigate a lift based wave energy converter (WEC), namely, a cycloidal turbine, as a wave termination device. A cycloidal turbine employs the same geometry as the well established Cycloidal or Voith-Schneider Propeller. The interaction of intermediate water waves with the Cycloidal WEC is presented in this paper. The cycloidal WEC consists of a shaft and one or more hydrofoils that are attached eccentrically to the main shaft and can be adjusted in pitch angle as the Cycloidal WEC rotates. The main shaft is aligned parallel to the wave crests and fully submerged at a fixed depth. We show that the geometry of the Cycloidal WEC is suitable for wave termination of straight crested waves. Two-dimensional potential flow simulations are presented where the hydrofoils are modeled as point vortices. The operation of the Cycloidal WEC both as a wave generator as well as a wave energy converter interacting with a linear Airy wave is demonstrated. The influence that the design parameters radius and submergence depth on the performance of the WEC have is shown. For optimal parameter choices, we demonstrate inviscid energy conversion efficiencies of up to 95% of the incoming wave energy to shaft energy. This is achieved by using feedback control to synchronize the rotational rate and phase of the Cycloidal WEC to the incoming wave. While we show complete termination of the incoming wave, the remainder of the energy is lost to harmonic waves travelling in the upwave and downwave direction.
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Hovland, Justin, Robert Paasch, and Merrick Haller. "Characterizing Dangerous Waves for Ocean Wave Energy Converter Survivability." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20421.

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Ocean Wave Energy Converters (OWECs) operating on the water surface are subject to storms and other extreme events. In particular, high and steep waves, especially breaking waves, are likely the most dangerous to OWECs. A method for quantifying the breaking severity of waves is presented and applied to wave data from Coastal Data Information Program station 139. The data are wave height and length statistics found by conducting a zero-crossing analysis of time-series wave elevation records. Data from two of the most severe storms in the data set were analyzed. In order to estimate the breaking severity, two different steepness-based breaking criteria were utilized, one being the steepness where waves begin to show a tendency to break, the other the steepness above which waves are expected to break. Breaking severity is assigned as a fuzzy membership function between the two conditions. The distribution of breaking severity is found to be exponential. It is shown that the highest waves are not necessarily the most dangerous. Even so, waves expected to be breaking are observed being up to 17 meters tall at station 139.
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Ringwood, John, Francesco Ferri, Nathan Tom, Kelley Ruehl, Nicols Faedo, Giorgio Bacelli, Yi-Hsiang Yu, and Ryan G. Coe. "The Wave Energy Converter Control Competition: Overview." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95216.

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Abstract Over the past two years, a wave energy converter control systems competition (WECCCOMP) has been in progress, with the objective of comparing different wave energy converter (WEC) control paradigms on a standard benchmark problem. The target system is a point absorber, corresponding to a single float with an absolute reference, of the WaveStar WEC prototype. The system was modelled in WEC-Sim, with the hydrodynamic parameters validated against tank test data. Competitors were asked to design and implement a WEC control system for this model, with performance evaluated across six sea states. The evaluation criteria included a weighted combination of average converted power, peak/average power, and the degree to which the system physical constraints were exploited or temporarily exceeded. This paper provides an overview of the competition, which includes a comparative evaluation of the entries and their performance on the simulation model. It is intended that this paper will act as an anchor presentation in a special session on WECCCOMP at OMAE 2019, with other papers in the special session contributed by the competitors, describing in detail the control algorithms and the results achieved over the various sea states.
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Shabara, Mohamed A., Shangyan Zou, and Ossama Abdelkhalik. "Numerical Investigation of a Variable-Shape Buoy Wave Energy Converter." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-63594.

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Abstract A novel Variable-Shape Buoy Wave Energy Converter (VSB WEC) that aims at eliminating the requirement of reactive power is analyzed in this paper. Unlike conventional Fixed Shape Buoy Wave Energy Converters (FSB WECs), the VSB WEC allows continuous shape-changing (flexible) responses to ocean waves. The non-linear interaction between the device and waves is demonstrated to result in more power when using simple, low-cost damping control system. High fidelity numerical simulations are conducted to compare the performance of a VSB WEC to a conventional FSB WEC, of the same volume and mass, in terms of power conversion, maximum displacements, and velocities. A Computational Fluid Dynamics (CFD) based Numerical Wave Tank (CNWT), developed using ANSYS 2-way fluid-structure interaction (FSI) is used for simulations. The results show that the average power conversion is significantly increased when using the VSB WEC.
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Viola, Alessia, and Marco Trapanese. "An Innovative Wave Energy Converter in the Mediterranean Sea." In 2018 OCEANS - MTS/IEEE Kobe Techno-Ocean (OTO). IEEE, 2018. http://dx.doi.org/10.1109/oceanskobe.2018.8559218.

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Folley, Matt, and Trevor Whittaker. "Preliminary Cross-Validation of Wave Energy Converter Array Interactions." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10837.

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The development of wave energy for utility-scale electricity production requires an understanding of how wave energy converters will interact with each other when part of a wave farm. Without this understanding it is difficult to calculate the energy yield from a wave farm and consequently the optimal wave farm layout and configuration cannot be determined. In addition, the uncertainty in a wave farm’s energy yield will increase the cost of finance for the project, which ultimately increases the cost of energy. Numerical modelling of wave energy converter arrays, based on potential flow, has provided some initial indications of the strength of array interactions and optimal array configurations; however, there has been limited validation of these numerical models. Moreover, the cross-validation that has been completed has been for relatively small arrays of wave energy converters. To provide some validation for large array interactions wave basin testing of three different configurations of up to 24 wave energy converters has been completed. All tests used polychromatic (irregular) sea-states, with a range of long-crested and short-crested seas, to provide validation in realistic conditions. The physical model array interactions are compared to those predicted by a numerical model and the suitability of the numerical and physical models analysed. The results are analysed at three different levels and all provide support for the cross-validation of the two models. The differences between the physical and numerical model are also identified and the implications for improving the modelling discussed.
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Reports on the topic "Ocean wave energy converter"

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Dallman, Ann Renee, and Vincent Sinclair Neary. Characterization of U.S. Wave Energy Converter (WEC) Test Sites: A Catalogue of Met-Ocean Data. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1160290.

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Ann R. Dallman and Vincent S. Neary. Characterization of U.S. Wave Energy Converter (WEC) Test Sites: A Catalogue of Met-Ocean Data, 2nd Edition. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1325402.

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Haxel, Joe H., and Sarah K. Henkel. Measuring changes in ambient noise levels from the installation and operation of a surge wave energy converter in the coastal ocean. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1400245.

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Stefan G Siegel, Ph D. Cycloidal Wave Energy Converter. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1061484.

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Bull, Diana L., Chris Smith, Dale Scott Jenne, Paul Jacob, Andrea Copping, Steve Willits, Arnold Fontaine, et al. Reference Model 6 (RM6): Oscillating Wave Energy Converter. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1159445.

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Cheung, Jeffrey T., and Earl F. Childress III. Ocean Wave Energy Harvesting Devices. Fort Belvoir, VA: Defense Technical Information Center, January 2008. http://dx.doi.org/10.21236/ada476763.

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Kopf, Steven. WET-NZ Multi-Mode Wave Energy Converter Advancement Project. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1097595.

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Yu, Y. H., D. S. Jenne, R. Thresher, A. Copping, S. Geerlofs, and L. A. Hanna. Reference Model 5 (RM5): Oscillating Surge Wave Energy Converter. Office of Scientific and Technical Information (OSTI), January 2015. http://dx.doi.org/10.2172/1169778.

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Weber, Jochem W., and Daniel Laird. Structured Innovation of High-Performance Wave Energy Converter Technology: Preprint. Office of Scientific and Technical Information (OSTI), January 2018. http://dx.doi.org/10.2172/1418966.

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Ruehl, Kelley, Giorgio Bacelli, and Budi Gunawan. Experimental Testing of a Floating Oscillating Surge Wave Energy Converter. Office of Scientific and Technical Information (OSTI), March 2019. http://dx.doi.org/10.2172/1761877.

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