Relevant bibliographies by topics / Ocean wave energy harvesting

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Ocean wave energy harvesting'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Ocean wave energy harvesting"

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Scruggs, J., and P. Jacob. "ENGINEERING: Harvesting Ocean Wave Energy." Science 323, no. 5918 (February 27, 2009): 1176–78. http://dx.doi.org/10.1126/science.1168245.

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von Jouanne, Annette. "Harvesting the Waves." Mechanical Engineering 128, no. 12 (December 1, 2006): 24–27. http://dx.doi.org/10.1115/1.2006-dec-1.

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This article elaborates ways of harnessing the power of the ocean. Engineers have attempted, with varying success, to tap ocean energy as it occurs in waves, tides, marine currents, thermal gradients, and differences in salinity. Among these forms, significant opportunities and benefits have been identified in the area of wave-energy extraction. As a form of harvestable energy, waves have advantages not simply over other forms of ocean power, but also over more conventional renewable energy sources, such as the wind and the sun. Wave energy also offers much higher energy densities, enabling devices to extract more power from a smaller volume at consequent lower costs. The Oregon State University (OSU) wave energy team is developing several novel direct-drive prototypes, including buoys that incorporate permanent magnet linear generators, permanent magnet rack-and-pinion generators, and contactless force transmission generators. The OSU researchers are also interested in small-scale wave-energy generators, which could be integrated into boat anchor systems to power a variety of small craft electronic devices.
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Wu, Zhijia, Carlos Levi, and Segen F. Estefen. "Wave energy harvesting using nonlinear stiffness system." Applied Ocean Research 74 (May 2018): 102–16. http://dx.doi.org/10.1016/j.apor.2018.02.009.

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Liu, Bingqi, Huanggao Yi, Carlos Levi, Segen F. Estefen, Zhijia Wu, and Menglan Duan. "Improved bistable mechanism for wave energy harvesting." Ocean Engineering 232 (July 2021): 109139. http://dx.doi.org/10.1016/j.oceaneng.2021.109139.

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Nabavi, Seyedeh Fatemeh, Anooshiravan Farshidianfar, Aref Afsharfard, and Hamed Haddad Khodaparast. "An ocean wave-based piezoelectric energy harvesting system using breaking wave force." International Journal of Mechanical Sciences 151 (February 2019): 498–507. http://dx.doi.org/10.1016/j.ijmecsci.2018.12.008.

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Nabavi, Seyedeh Fatemeh, Anooshiravan Farshidianfar, and Aref Afsharfard. "Novel piezoelectric-based ocean wave energy harvesting from offshore buoys." Applied Ocean Research 76 (July 2018): 174–83. http://dx.doi.org/10.1016/j.apor.2018.05.005.

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Wu, Nan, Quan Wang, and XiangDong Xie. "Ocean wave energy harvesting with a piezoelectric coupled buoy structure." Applied Ocean Research 50 (March 2015): 110–18. http://dx.doi.org/10.1016/j.apor.2015.01.004.

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Liu, Na, Yimin Tan, Weiqiang Mo, Huanqing Han, and Lin Li. "Optimization Design for Ocean Wave Energy Convertor." E3S Web of Conferences 185 (2020): 01073. http://dx.doi.org/10.1051/e3sconf/202018501073.

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Establishing a theoretical model for Ocean Wave Energy Convertor in advance is a necessary step during studying the energy harvesting of ocean wave which can save the engineering cost and improve research efficiency. Since low energy conversion efficiency existed in wave energy convertor when capturing ocean wave energy, the mechanism of slotless Halbach linear generator which can optimize the magnetic field distribution of the generator is adopted as the secondary energy conversion devices to solve the problem. The magnetic vector potential theory is introduced to analysis the topology of Halbach linear generator, then expressions of the generator’s performance have been deduced. Hence, the analysis model of the Halbach linear generator has been settled. To obtain the global optimal solution, the simulated annealing algorithm has been used to slove that derived model. Then a series of linear generator’s design parameters are fixed, which include dimensions of permanent magnets and winding coils. The error of linear generator’s peak power between analytical solution results and simulation results is about 3.6%. The experiment result demonstrates that maximum output power of optimized Halbach linear generator reaches 570w.
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Huang, Bin, Pengzhong Wang, Lu Wang, Shuai Yang, and Dazhuan Wu. "Recent advances in ocean wave energy harvesting by triboelectric nanogenerator: An overview." Nanotechnology Reviews 9, no. 1 (August 24, 2020): 716–35. http://dx.doi.org/10.1515/ntrev-2020-0055.

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AbstractA sustainable power source is more and more important in modern society. Ocean wave energy is a very promising renewable energy source, and it is widely distributed worldwide. But, it is difficult to develop efficiently due to various limitations of the traditional electromagnetic generator. In recent years, the newly developed triboelectric nanogenerator (TENG) provides an excellent way to convert water wave energy into electrical energy, which is mainly based on the coupling between triboelectrification and electrostatic induction. In this paper, a review is given for recent advances in using the TENG technology harvesting water wave energy. We first introduce the four most fundamental modes of TENG, based on which a range of wave energy harvesting devices have been demonstrated. Then, these applications’ structure and performance optimizations are discussed. Besides, the connection methods between TENG units are also summarized. Finally, it also outlines the development prospects and challenges of technology.
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Zhou, Xiang, Ossama Abdelkhalik, and Wayne Weaver. "Power Take-Off and Energy Storage System Static Modeling and Sizing for Direct Drive Wave Energy Converter to Support Ocean Sensing Applications." Journal of Marine Science and Engineering 8, no. 7 (July 13, 2020): 513. http://dx.doi.org/10.3390/jmse8070513.

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This paper addresses the sizing and design problem of a permanent magnet electrical machine power take-off system for a two-body wave energy converter, which is designed to support ocean sensing applications with sustained power. The design is based upon ground truth ocean data bi-spectrums (swell and wind waves) from Martha’s Vineyard Coastal Observatory in the year 2015. According to the ground truth ocean data, the paper presents the optimal harvesting power time series of the whole year. The electrical machine and energy storage static modeling are introduced in the paper. The paper uses the ground truth ocean data in March to discuss the model integration of the buoy dynamic model, the power take-off model, and the energy storage model. Electrical machine operation constraints are applied to ensure the designed machine can fulfill the buoy control requirements. The electrical machine and energy storage systems operation status is presented as well. Furthermore, rule-based control strategies are applied to the electrical machine for fulfilling specific design demands, such as improving power generating efficiency and downsizing the electrical machine scale. The corresponding required capacities of the energy storage system are discussed. This paper relates results to the wave data sets (different combinations of significant wave heights and periods of both swell and wind waves). In this way, the power take-off system rule-based control strategy determinations can rely on current ocean wave measurements instead of a large historical ocean wave database.
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Dissertations / Theses on the topic "Ocean wave energy harvesting"

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Giuliani, Chiara. "Alteration of ocean waves by periodic submerged structures for renewable energy extraction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Questa tesi si concentra sul comportamento di strutture immerse e sulla loro interazione con fenomeni ondosi oceanici allo scopo di modificarne l’ampiezza in superficie. Si suppone che queste strutture siano disposte sul fondale marino secondo schemi geometrici ricorrenti, per esempio lenti. Opportune disposizioni strutturali possono indurre un’interferenza costruttiva sulle onde di superficie, le quali presentano tipicamente un carattere pseudo-periodico nel tempo e nello spazio aumentandone così l’ampiezza. Noto che l’energia delle onde di superficie è proporzionale alla loro ampiezza, i risultati proposti in questa ricerca possono essere utilizzati per migliorare, in maniera del tutto sostenibile, l’efficienza dei dispositivi che sfruttano il moto ondoso per l’estrazione di energia rinnovabile, anche noti come energy harvesters. Per questi ultimi infatti l’efficienza della conversione dell’energia dipende dalla variazione altimetrica fra la cresta e il ventre dell’onda. Nello studio del problema, si considereranno le equazioni classiche di Navier-Stokes applicate al caso di fondali medio bassi (shallow waters). Successivamente teorie complesse per lo studio di sistemi periodici (già utilizzate in altri campi come la fisica quantistica e l’elettromagnetismo), verranno applicate per descrivere l’interazione tra le onde e il fondale periodico. Tale formulazione consentirà di progettare le strutture sul fondale capaci ottimizzare l’ampiezza dell’onda rispetto al caso di fondale indisturbato.
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Martin, Dillon Minkoff. "Hydrodynamic Design Optimization and Wave Tank Testing of Self-Reacting Two-Body Wave Energy Converter." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/80298.

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As worldwide energy consumption continues to increase, so does the demand for renewable energy sources. The total available wave energy resource for the United States alone is 2,640 TWh/yr; nearly two thirds of the 4,000 TWh of electricity used in the United States each year. It is estimated that nearly half of that available energy is recoverable through wave energy conversion techniques. In this thesis, a two-body 'point absorber' type wave energy converter with a mechanical power-takeoff is investigated. The two-body wave energy converter extracts energy through the relative motion of a floating buoy and a neutrally buoyant submerged body. Using a linear frequency-domain model, analytical solutions of the optimal power and the corresponding power-takeoff components are derived for the two-body wave energy converter. Using these solutions, a case study is conducted to investigate the influence of the submerged body size on the absorbed power of the device in regular and irregular waves. Here it is found that an optimal mass ratio between the submerged body and floating buoy exists where the device will achieve resonance. Furthermore, a case study to investigate the influence of the submerged body shape on the absorbed power is conducted using a time-domain numerical model. Here it is found that the submerged body should be designed to reduce the effects of drag, but to maintain relatively large hydrodynamic added mass and excitation force. To validate the analytical and numerical models, a 1/30th scale model of a two-body wave energy converter is tested in a wave tank. The results of the wave tank tests show that the two-body wave energy converter can absorb nearly twice the energy of a single-body 'point absorber' type wave energy converter.
Master of Science
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Xiong, Qiuchi. "Control of Vibration Systems with Mechanical Motion Rectifier and their Applications to Vehicle Suspension and Ocean Energy Harvester." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98004.

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Vibration control is a large branch in control research, because all moving systems may induce desired or undesired vibration. Due to the limitation of passive system's adaptability and changing excitation input, vibration control brings the solution to change system dynamic with desired behavior to fulfill control targets. According to preference, vibration control can be separated into two categories: vibration reduction and vibration amplification. Lots of research papers only examine one aspect in vibration control. The thesis investigates the control development for both control targets with two different control applications: vehicle suspension and ocean wave energy converter. It develops control methods for both systems with simplified modeling setup, then followed by the application of a novel mechanical motion rectifier (MMR) gearbox that uses mechanical one-way clutches in both systems. The flow is from the control for common system to the control design for a specifically designed system. In the thesis, active (model predictive control: MPC), semi-active (Skyhook, skyhook-power driven damper: SH-PDD, hybrid model predictive control: HMPC), and passive control (Latching Control) methods are developed for different applications or control performance comparison on single system. The thesis also studies about new type of system with switching mechanism, in which other papers do not talk too much and possible control research direction to deal with such complicated system in vibration control. The state-space modeling for both systems are provided in the thesis with detailed model of the MMR gearbox. From the simulation, it can be shown that in the vehicle suspension application, the controlled MMR gearbox can be effective in improving vehicle ride comfort by 29.2% compared to that of the traditional hydraulic suspension. In the ocean wave energy converter, the controlled MMR WEC with simple latching control can improve the power generation by 57% compared to the passive MMR WEC. Besides, the passive MMR WEC also shows its advantage on the passive direct drive WEC in power generation improvement. From the control development flow for the MMR system, the limitation of the MMR gearbox is also identified, which introduces the future work in developing active-MMR gearbox by using an electromagnetic clutch. Some possible control development directions on the active-MMR is also mentioned at the end of the thesis to provide reference for future works.
Master of Science
Vibration happens in our daily life in almost all cases. It is a regular or irregular back and forth motion of particles. For example, when we start a vehicle, the engine will do circular motion to drive the wheel, which causes vibration and we feel wave pulses on our body when we sit in the car. However, this kind of vibration is undesirable, since it makes us uncomfortable. The car manufacture designs cushion seats to absorb vibration. This is a way to use hardware to control vibration. However, this is not enough. When vehicle goes through bumps, we do have suspension to absorb vibration transferred from road to our body. The car still experiences a big shock that makes us feel dizzy. On the opposite direction, in some cases when vibration becomes the motion source for energy harvesting, we would like to enhance it. Hardware can be helpful, since by tuning some parameters of an energy harvesting device, it can match with the vibration source to maximize vibration. However, it is still not enough due to low adaptability of a fixed parameter system. To overcome the limitation of hardware, researches begin to think about the way to control vibration, which is the method to change system behavior by using real-time adjustable hardware. By introducing vibration control, the theory behind that started to be investigated. This thesis investigates the vibration control theory application in both cases: vibration reduction and vibration enhancement, which are mentioned above due to opposite application preferences. There are two major applications of vibration control: vehicle suspension control and ocean wave energy converter (WEC) control. The thesis starts from the control development for both fields with general modeling criteria, then followed by control development with specific hardware design-mechanical motion rectifier (MMR) gearbox-applied on both systems. The MMR gearbox is the researcher designed hardware that targets on vibration adjustment with hardware capability, which is similar as the cushion seats mentioned at the beginning of the abstract. However, the MMR cannot have capability to furtherly optimize system vibration, which introduces the necessity of control development based on the existing hardware. In the suspension control application, the control strategy introduced successfully improve the vehicle ride comfort by 29.2%, which means the vehicle body acceleration has been reduced furtherly to let passenger feel less vibration. In the WEC application, the power absorbed from wave has been improved by 57% by applying suitable control strategy. The performance of improvement on vibration control has proved the effect on further vibration optimization beyond hardware limitation.
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Li, Xiaofan. "Design, Analysis and Testing of a Self-reactive Wave Energy Point Absorber with Mechanical Power Take-off." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/100800.

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Ocean wave as a renewable energy source possesses great potential for solving the world energy crisis and benefit human beings. The total theoretical potential wave power on the ocean-facing coastlines of the world is around 30,000 TWh, although cannot all be adopted for generating electricity, the amount of the power can be absorbed still can occupy a large portion of the world's total energy consumption. However, multiple reasons have stopped the ocean wave energy from being widely adopted, and among those reasons, the most important one is immature of the Power Take-off (PTO) technology. In this dissertation, a self-reactive two-body wave energy point absorber that is embedded with a novel PTO using the unique mechanism of Mechanical Motion Rectifier (MMR) is investigated through design, analysis and testing to improve the energy harvesting efficiency and the reliability of the PTO. The MMR mechanism can transfer the reciprocated bi-directional movement of the ocean wave into unidirectional rotation of the generator. As a result, this mechanism brings in two advantages towards the PTO. The first advantage it possess is that the alternating stress of the PTO is changed into normal stress, hence the reliability of the components are expected to be improved significantly. The other advantage it brings in is a unique phenomenon of engagement and disengagement during the operation, which lead to a piecewise nonlinear dynamic property of the PTO. This nonlinearity of the PTO can contribute to an expanded frequency domain bandwidth and better efficiency, which are verified through both numerical simulation and in-lab experiment. During the in-lab test, the prototyped PTO achieved energy transfer efficiency as high as 81.2%, and over 40% of efficiency improvement compared with the traditional non-MMR PTO under low-speed condition, proving the previously proposed advantage. Through a more comprehensive study, the MMR PTO is further characterized and a refined dynamic model. The refined model can accurately predict the dynamic response of the PTO. The major factors that can influence the performance of the MMR PTO, which are the inertia of the PTO, the damping coefficient, and the excitation frequency, are explored through analysis and experiment comprehensively. The results show that the increase on the inertia of the PTO and excitation frequency, and decrease on the damping coefficient can lead to a longer disengagement of the PTO and can be expressed analytically. Besides the research on the PTO, the body structure of the point absorber is analyzed. Due to the low-frequency of the ocean wave excitation, usually a very large body dimension for the floating buoy of the point absorber is desired to match with that frequency. To solve this issue, a self-reactive two-body structure is designed where an additional frequency between the two interactive bodies are added to match the ocean wave frequency by adopting an additional reactive submerged body. The self-reactive two-body structure is tested in a wave to compare with the single body design. The results show that the two-body structure can successfully achieve the frequency matching function, and it can improve more than 50% of total power absorption compared with the single body design.
Doctor of Philosophy
Ocean wave as a renewable energy source possesses great potential for solving the world energy crisis and benefit human beings. The total theoretical potential wave power on the ocean-facing coastlines of the world is around 30,000 TWh, although impossible to be all transferred into electricity, the amount of the power can be absorbed still can cover a large portion of the world's total energy consumption. However, multiple reasons have stopped the ocean wave energy from being widely adopted, and among those reasons, the most important one is immature of the Power Take-off (PTO) technology. In this dissertation, a novel two body wave energy converter with a PTO using the unique mechanism of Mechanical Motion Rectifier (MMR) is investigated through design, analysis, and testing. To improve the energy harvesting efficiency and the reliability of the PTO, the dissertation induced a mechanical PTO that uses MMR mechanism which can transfer the reciprocated bi-directional movement of the ocean wave into unidirectional rotation of the generator. This mechanism brings in a unique phenomenon of engagement and disengagement and a piecewise nonlinear dynamic property into the PTO. Through a comprehensive study, the MMR PTO is further characterized and a refined dynamic model that can accurately predict the dynamic response of the PTO is established. The major factors that can influence the performance of the MMR PTO are explored and discussed both analytically and experimentally. Moreover, as it has been theoretically hypothesis that using a two-body structure for designing the point absorbers can help it to achieve a frequency tuning effect for it to better match with the excitation frequency of the ocean wave, it lacks experimental verification. In this dissertation, a scaled two-body point absorber prototype is developed and put into a wave tank to compare with the single body structure. The test results show that through the use of two-body structure and by designing the mass ratio between the two bodies properly, the point absorber can successfully match the excitation frequency of the wave. The highest power capture width ratio (CWR) achieved during the test is 58.7%, which exceeds the results of similar prototypes, proving the advantage of the proposed design.
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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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Leclercq, Mathilde. "Harvesting energy from the sea." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91881.

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Every marine energy source presents advantages and disadvantages. For example, they are not atthe same stage of maturity. Tidal range power is fully mature but the limited number of sitesavailable, combined with the large environmental impacts and investment costs limit itsdevelopment. The idea of artificial lagoons that will be offshore tidal range plant could create a newinterest for this technology. But for the moment, no plant of this type has been constructed yet. Tidalstream power is the next mature technology of marine energy after tidal range. Its development willrequire public subsidies but is supposed to be commercial in 2015. Systems are already indemonstration in several countries (UK, France and Canada). Wave power is less mature but it willbenefit from the development of tidal stream power and will probably be commercial in 2020. Somesystems are also in demonstration but challenges seem greater in wave power than in tidal power.Wave power conversion systems have to extract energy from the waves, even the largest ones, butat the same time resist to them. Contrary to tidal stream which has a predictable resource, waves areway less predictable and systems will have to be able to resist and valorize waves. OTEC (OceanThermal Energy Conversion) has been studied for years but it is still not mature. Its development forelectricity production needs technology research to develop cheaper and more compact systems(heat exchangers, pipes…). Air conditioning applications are developing and also require the use ofpipes and heat exchangers. Advances in this utilization could maybe help the development of OTECsystems for electricity production. Osmosis is the less mature and the most challenging technology. Atechnological breakthrough in the membrane could allow a rapid development. This breakthroughwill probably come from other sectors so it is important for the industries to get ready in order todevelop the system as soon as this technological improvement will be made.
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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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Wang, Guangyao. "An Investigation of Phase Change Material (PCM)-Based Ocean Thermal Energy Harvesting." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100989.

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Phase change material (PCM)-based ocean thermal energy harvesting is a relatively new method, which extracts the thermal energy from the temperature gradient in the ocean thermocline. Its basic idea is to utilize the temperature variation along the ocean water depth to cyclically freeze and melt a specific kind of PCM. The volume expansion, which happens in the melting process, is used to do useful work (e.g., drive a turbine generator), thereby converting a fraction of the absorbed thermal energy into mechanical energy or electrical energy. Compared to other ocean energy technologies (e.g., wave energy converters, tidal current turbines, and ocean thermal energy conversion), the proposed PCM-based approach can be easily implemented at a small scale with a relatively simple structural system, which makes it a promising method to extend the range and service life of battery-powered devices, e.g, autonomous underwater vehicles (AUVs). This dissertation presents a combined theoretical and experimental study of the PCM-based ocean thermal energy harvesting approach, which aims at demonstrating the feasibility of the proposed approach and investigating possible methods to improve the overall performance of prototypical systems. First, a solid/liquid phase change thermodynamic model is developed, based on which a specific upperbound of the thermal efficiency is derived for the PCM-based approach. Next, a prototypical PCM-based ocean thermal energy harvesting system is designed, fabricated, and tested. To predict the performance of specific systems, a thermo-mechanical model, which couples the thermodynamic behaviors of the fluid materials and the elastic behavior of the structural system, is developed and validated based on the comparison with the experimental measurement. For the purpose of design optimization, the validated thermo-mechanical model is employed to conduct a parametric study. Based on the results of the parametric study, a new scalable and portable PCM-based ocean thermal energy harvesting system is developed and tested. In addition, the thermo-mechanical model is modified to account for the design changes. However, a combined analysis of the results from both the prototypical system and the model reveals that achieving a good performance requires maintaining a high internal pressure, which will complicate the structural design. To mitigate this issue, the idea of using a hydraulic accumulator to regulate the internal pressure is proposed, and experimentally and theoretically examined. Finally, a spatial-varying Robin transmission condition for fluid-structure coupled problems with strong added-mass effect is proposed and investigated using fluid structure interaction (FSI) model problems. This can be a potential method for the future research on the fluid-structure coupled numerical analysis of AUVs, which are integrated with and powered by the PCM-based thermal energy harvesting devices.
Doctor of Philosophy
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Horton, Bryan. "Rotational motion of pendula systems for wave energy extraction." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25873.

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Books on the topic "Ocean wave energy harvesting"

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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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Khaligh, Alireza. Energy harvesting: Solar, wind, and ocean energy conversion systems. Boca Raton: CRC Press, 2010.

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C, Onar Omer, ed. Energy harvesting: Solar, wind, and ocean energy conversion systems. Boca Raton: Taylor & Francis, 2010.

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Khaligh, Alireza. Energy harvesting: Solar, wind, and ocean energy conversion systems. Boca Raton: Taylor & Francis, 2010.

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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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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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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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Book chapters on the topic "Ocean wave energy harvesting"

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Sundar, V. "Ocean Wave Energy." In Ocean Wave Mechanics, 201–14. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119241652.ch8.

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Hagerman, George, and Ted Heller. "Wave Energy Technology Assessment." In Ocean Resources, 183–89. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2131-3_15.

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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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Sundar, V., and S. A. Sannasiraj. "Wave Energy Potential." In Ocean Wave Energy Systems, 1–17. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_1.

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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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Li, Mingfang. "Wave Energy Utilization Buoy." In Encyclopedia of Ocean Engineering, 1–14. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-10-6963-5_71-1.

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Kofoed, Jens Peter. "The Wave Energy Sector." In Handbook of Ocean Wave Energy, 17–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39889-1_2.

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Folley, Matt. "The Wave Energy Resource." In Handbook of Ocean Wave Energy, 43–79. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39889-1_3.

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Bernitsas, Michael M. "Harvesting Energy by Flow Included Motions." In Springer Handbook of Ocean Engineering, 1163–244. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16649-0_47.

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Das, Tapas K., R. Suchithra, and Abdus Samad. "Experimental Testing of Air Turbines for Wave Energy Conversion." In Ocean Wave Energy Systems, 397–418. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_13.

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Conference papers on the topic "Ocean wave energy harvesting"

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Bastien, S. P., R. B. Sepe, A. R. Grilli, S. T. Grilli, and M. L. Spaulding. "Ocean wave energy harvesting buoy for sensors." In 2009 IEEE Energy Conversion Congress and Exposition. ECCE 2009. IEEE, 2009. http://dx.doi.org/10.1109/ecce.2009.5316189.

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Sateriale, Maura, Yalda Sadaat, and Reza Ghorbani. "Adjustable wave chamber for better ocean wave energy harvesting." In OCEANS 2015 - Genova. IEEE, 2015. http://dx.doi.org/10.1109/oceans-genova.2015.7271637.

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Harne, R. L., M. E. Schoemaker, and K. W. Wang. "Multistable chain for ocean wave vibration energy harvesting." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Wei-Hsin Liao. SPIE, 2014. http://dx.doi.org/10.1117/12.2044267.

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Mutsuda, Hidemi, Ryuta Watanabe, Masato Hirata, Yasuaki Doi, and Yoshikazu Tanaka. "Elastic Floating Unit With Piezoelectric Device for Harvesting Ocean Wave Energy." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83318.

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The purpose of this study is to improve FPED (Flexible PiEzoelectric Device) we have developed. The FPED consisting of piezo-electric polymer film (PVDF) is a way of harvesting electrical energy from ocean power, e.g. tide, current, wave, breaking wave and vortex. We also propose an Elastic Floating unit with HAanging Structures (EFHAS) using FPED. The EFHAS consists of floating unit and hanging unit. In this study, we investigated electric performance of FPED and EFHAS and also modified internal structure of FPED to increase electrical efficiency. As a result, Electric performance is increasing with increasing number of PVDFs laminated in FPED. Multilayer type of FPED can rapidly increase electric efficiency. Electric power can be improved by FPED attached a bluff body with relative density. Electric performance of floating type for floating unit of EFHAS is better than that of submerged type. Distance L/λ = 0.4 between floaters of floating unit is suitable for highly electric performance. In hanging unit of EFHAS, it is possible to increase electric power per unit area with increasing number of stairs. In conclusion, we showed the EFHAS with the FPED could be useful for harvesting ocean wave energy.
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Gemme, Douglas A., Steven P. Bastien, Raymond B. Sepe, John Montgomery, Stephan T. Grilli, and Annette Grilli. "Experimental testing and model validation for ocean wave energy harvesting buoys." In 2013 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2013. http://dx.doi.org/10.1109/ecce.2013.6646720.

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Ai, Junxiao, Hwan Lee, Changwei Liang, and Lei Zuo. "Ocean Wave Energy Harvester With a Novel Power Takeoff Mechanism." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34332.

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The potential for electricity generation from ocean wave energy in the US is estimated to be 64% of the total electricity generated from all sources in 2010. Over 53% of the US population lives within 50 miles of the coast (NOAA), which means ocean waves offer ready opportunity for harvesting power. This paper will present a details progress of developing an innovative ocean wave energy harvester, with adopting an innovative power takeoff mechanism named mechanical motion rectifier (MMR), which will directly convert the irregular oscillatory wave motion into regular unidirectional rotation of the generator. It marries the advantages of the direct and indirect-drive power takeoff methods, with a much higher energy conversion efficiency and enhanced reliability and compactness. Experiment has been carried out and the results verify that the novel power take-off mechanism improved the performance of wave energy harvester.
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Guo, Qiyu, Ming Sun, Huicong Liu, Xin Ma, Zhaohui Chen, Tao Chen, and Lining Sun. "Design and experiment of an electromagnetic ocean wave energy harvesting device." In 2018 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM). IEEE, 2018. http://dx.doi.org/10.1109/aim.2018.8452264.

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Vasquez, Rafael E., Julio C. Correa, and Carl D. Crane. "Kinematics and Dynamics of a Planar Tensegrity Mechanism for Ocean Wave Energy Harvesting." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70320.

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Tensegrity systems have been used in several disciplines such as architecture, biology, aerospace, mechanics and robotics during the last fifty years. However, just a few references in literature have stated the possibility of using tensegrity systems in ocean or energy-related applications. This work addresses the kinematic and dynamic analyses of a planar tensegrity mechanism for ocean wave energy harvesting. A planar tensegrity mechanism is proposed based on a planar morphology known as “X-frame” that was developed by Kenneth Snelson in 1960s. A geometric approach is used to solve the forward and reverse displacement problems. The theory of screws is used to perform the forward and reverse velocity analyses of the device. The Lagrangian approach is used to deduce the equations of motion considering the interaction between the mechanism and a linear model of ocean waves. The result shows that tensegrity systems could play an important role in the expansion of clean energy technologies that help the world’s sustainable development.
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Yin, Xiuxing, Xiaofan Li, Vicky Boontanom, and Lei Zuo. "Mechanical Motion Rectifier Based Efficient Power Takeoff for Ocean Wave Energy Harvesting." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5198.

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This paper proposes a novel mechanical-motion-rectifier (MMR) based power-takeoff (PTO) for ocean wave energy harvesting. The proposed PTO directly converts irregular oscillatory wave motion into regular unidirectional rotation of the generator. It is mainly composed of two ball screws, three bevel gears, two one-way clutches, and a generator. The two one-way clutches and the bevel gears change the bi-directional rotation of the two ball screws into unidirectional ration of the generator. The MMR rectifies the irregular reciprocating motion into unidirectional rotation; similar to the way the electric voltage rectifier regulates an AC voltage. The proposed PTO can be integrated into a heaving point wave energy converter (WEC). The dynamics and modelling of the PTO are presented. The frequency-domain dynamics of the WEC are then formulated for operating condition and control. The power generation capability of the proposed WEC has been evaluated in MATLAB and WAMIT. The simulation results demonstrate that the power generation capability can be improved by using the MMR method.
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Jurado, Ulises Tronco, Suan Hui Pu, and Neil M. White. "A contact-separation mode triboelectric nanogenerator for ocean wave impact energy harvesting." In 2017 IEEE SENSORS. IEEE, 2017. http://dx.doi.org/10.1109/icsens.2017.8234198.

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Reports on the topic "Ocean wave energy harvesting"

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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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Berg, Jonathan Charles. Extreme Ocean Wave Conditions for Northern California Wave Energy Conversion Device. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1113856.

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Hagerman, G., and G. Scott. Mapping and Assessment of the United States Ocean Wave Energy Resource. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1219363.

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Jacobson, Paul T., George Hagerman, and George Scott. Mapping and Assessment of the United States Ocean Wave Energy Resource. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1060943.

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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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Wu, Ru-Shan, and Xiao-Bi Xie. Study of Ocean Bottom Interactions with Acoustic Waves by a New Elastic Wave Propagation Algorithm and an Energy Flow Analysis Technique. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada628511.

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Wu, Ru-Shan, and Xiao-Bi Xie. Study of Ocean Bottom Interactions with Acoustic Waves by a New Elastic Wave Propagation Algorithm and an Energy Flow Analysis Technique. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada630870.

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