Journal articles: 'Ocean wave energy harvesting'

1

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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Al Shami, Elie, Ran Zhang, and Xu Wang. "Point Absorber Wave Energy Harvesters: A Review of Recent Developments." Energies 12, no. 1 (December 24, 2018): 47. http://dx.doi.org/10.3390/en12010047.

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Even though ocean waves around the world are known to contain high and dense amounts of energy, wave energy harvesters are still not as mature as other forms of renewable energy harvesting devices, especially when it comes to commercialization, mass production, and grid integration, but with the recent studies and optimizations, the point absorber wave energy harvester might be a potential candidate to stand out as the best solution to harvest energy from highly energetic locations around the world’s oceans. This paper presents an extensive literature review on point absorber wave energy harvesters and covers their recent theoretical and experimental development. The paper focuses on three main parts: One-body point absorbers, two-body point absorbers, and power take-offs. This review showcases the high amount of work being done to push point absorbers towards technological maturity to eventually kick off commercialization and mass production. It should also provide a good background on the recent status of point absorber development for researchers in the field.

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Zhang, Dahai, Jiawei Shi, Yulin Si, and Teng Li. "Multi-grating triboelectric nanogenerator for harvesting low-frequency ocean wave energy." Nano Energy 61 (July 2019): 132–40. http://dx.doi.org/10.1016/j.nanoen.2019.04.046.

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Chowdhury, Olly Roy, Hong-geun Kim, Myeongbae Lee, Changsun Shin, Yongyun Cho, and Jangwoo Park. "A Novel Wave Energy Harvesting System for Ocean Sensor Network Applications." International Journal of Control and Automation 9, no. 2 (February 28, 2016): 93–102. http://dx.doi.org/10.14257/ijca.2016.9.2.10.

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14

Kaltseis, Rainer, Christoph Keplinger, Soo Jin Adrian Koh, Richard Baumgartner, Yu Feng Goh, Wee Hoe Ng, Alexander Kogler, et al. "Natural rubber for sustainable high-power electrical energy generation." RSC Adv. 4, no. 53 (2014): 27905–13. http://dx.doi.org/10.1039/c4ra03090g.

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Sustainable natural rubber for soft generators opens up new possibilities for harvesting renewable resources. With this technology, ocean wave energy could become a cheap and clean resource for generation of electricity.

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Nguyen Duy, Vinh, and Hyung-Man Kim. "A Study of the Movement, Structural Stability, and Electrical Performance for Harvesting Ocean Kinetic Energy Based on IPMC Material." Processes 8, no. 6 (May 27, 2020): 641. http://dx.doi.org/10.3390/pr8060641.

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The movement of water in the oceans generates a vast store of kinetic energy, which has led to the development of a wide variety of offshore energy harvesters all over the world. In our energy harvester, we used ionic polymer-metal composites (IPMCs) to convert the ocean energy into electricity. This paper presents a simulated model of an IPMC-based electrochemical kinetic energy harvesting system installed in the ocean and produced using the computational fluid dynamics (CFD) method. The simulation processes focused on the movement and structural stability of the system design in the ocean for the protection of the IPMC module against possible damage, which would directly affect the power output. Furthermore, the experimental tests under real marine conditions were also studied to analyze the electrical harvesting performance of the IPMC system. These results showed that the use of IPMC materials has many advantages as they are soft and durable; as a result, they can respond faster to wave parameters such as frequency, amplitude, and wavelength.

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16

Karunarathna, Harshinie, Pravin Maduwantha, Bahareh Kamranzad, Harsha Rathnasooriya, and Kasun De Silva. "Impacts of Global Climate Change on the Future Ocean Wave Power Potential: A Case Study from the Indian Ocean." Energies 13, no. 11 (June 11, 2020): 3028. http://dx.doi.org/10.3390/en13113028.

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This study investigates the impacts of global climate change on the future wave power potential, taking Sri Lanka as a case study from the northern Indian Ocean. The geographical location of Sri Lanka, which receives long-distance swell waves generated in the Southern Indian Ocean, favors wave energy-harvesting. Waves projected by a numerical wave model developed using Simulating Waves Nearshore Waves (SWAN) wave model, which is forced by atmospheric forcings generated by an Atmospheric Global Climate Model (AGCM) within two time slices that represent “present” and “future” (end of century) wave climates, are used to evaluate and compare present and future wave power potential around Sri Lanka. The results reveal that there will be a 12–20% reduction in average available wave power along the south-west and south-east coasts of Sri Lanka in future. This reduction is due mainly to changes to the tropical south-west monsoon system because of global climate change. The available wave power resource attributed to swell wave component remains largely unchanged. Although a detailed analysis of monthly and annual average wave power under both “present” and “future” climates reveals a strong seasonal and some degree of inter-annual variability of wave power, a notable decadal-scale trend of variability is not visible during the simulated 25-year periods. Finally, the results reveal that the wave power attributed to swell waves are very stable over the long term.

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17

Sang, Yongjie, and Bertrand Dubus. "Performance assessment of a small-size ocean wave energy harvester." MATEC Web of Conferences 283 (2019): 05006. http://dx.doi.org/10.1051/matecconf/201928305006.

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A lightweight electromechanical device is studied to harvest energy of ocean waves and supply electrical power to small-size ocean observation equipment such as sonobuoys. It is composed of a magnet fixed to the floating housing which follows the motion of the ocean surface and a moving coil connected to the case via a flexible spring. As the floating housing follows the vertical motion of water surface, a voltage is induced in the coil due to relative velocity between the coil and the magnet, and kinetic energy of the ocean wave is converted into electrical energy. Full bridge rectifying circuit and smoothing capacitor are used to convert AC voltage to constant voltage. Single degree of freedom electromechanical model of the prototype transducer (LGT-4.5 geophone) is developed and simulated with an electrical circuit software to predict energy harvesting performance. Vibration experiments are also performed with a shaker to validate transducer model and quantify output voltage. Parametric analysis is conducted to identify optimal choice of capacitance in terms of maximum stored energy and minimum charging time. This device is simple and small size relative to ocean wavelength compared to classical linear permanent magnetic generator used in offshore power plant. Its power generation per unit weight is compared to larger scale ocean energy converters.

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18

Cheng, Ping, Yina Liu, Zhen Wen, Huiyun Shao, Aimin Wei, Xinkai Xie, Chen Chen, et al. "Atmospheric pressure difference driven triboelectric nanogenerator for efficiently harvesting ocean wave energy." Nano Energy 54 (December 2018): 156–62. http://dx.doi.org/10.1016/j.nanoen.2018.10.007.

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19

Yang, Kerui. "Harvesting the Blue Ocean Wave Energy with a Circular Electromagnetic Generator Prototype." International Journal of High School Research 2, no. 4 (December 31, 2020): 56–61. http://dx.doi.org/10.36838/v2i4.11.

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20

Phillips, Reed E. "Harvesting Ocean Wave Energy: A Proposed System for Conversion Into Electrical Power." Natural Gas & Electricity 36, no. 2 (August 19, 2019): 9–15. http://dx.doi.org/10.1002/gas.22135.

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21

Liu, Wenbo, Liang Xu, Guoxu Liu, Hang Yang, Tianzhao Bu, Xianpeng Fu, Shaohang Xu, Chunlong Fang, and Chi Zhang. "Network Topology Optimization of Triboelectric Nanogenerators for Effectively Harvesting Ocean Wave Energy." iScience 23, no. 12 (December 2020): 101848. http://dx.doi.org/10.1016/j.isci.2020.101848.

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Younesian, Davood, and Mohammad-Reza Alam. "Multi-stable mechanisms for high-efficiency and broadband ocean wave energy harvesting." Applied Energy 197 (July 2017): 292–302. http://dx.doi.org/10.1016/j.apenergy.2017.04.019.

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23

Viet, N. V., X. D. Xie, K. M. Liew, N. Banthia, and Q. Wang. "Energy harvesting from ocean waves by a floating energy harvester." Energy 112 (October 2016): 1219–26. http://dx.doi.org/10.1016/j.energy.2016.07.019.

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Jurado, Ulises Tronco, Suan Hui Pu, and Neil M. White. "Water-Dielectric Single Electrode Mode Triboelectric Nanogenerators for Ocean Wave Impact Energy Harvesting." Proceedings 2, no. 13 (December 21, 2018): 714. http://dx.doi.org/10.3390/proceedings2130714.

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The effect of water wave impacts and breakdown on the output performance of Water-Dielectric Single Electrode Mode Triboelectric Nanogenerators (WDSE-TENG) has been evaluated. When water contacts a TENG consisting of a hydrophobic dielectric layer, the triboelectric effect is generated with a net negative charge on the dielectric material and net positive charge on the water surface. The hydrophobic dielectric materials, which show the highest electrical output performance in contact with water, were FEP, silicone rubber and polyimide. The average output power of each sample for a load resistance of 10 MΩ was found to be in the range 14.69 to 19.12 µW. The results demonstrate that WDSE-TENG devices can work as an alternative energy harvesting mechanism by using water as a triboelectric material.

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Tao, Kai, Haiping Yi, Yang Yang, Honglong Chang, Jin Wu, Lihua Tang, Zhaoshu Yang, et al. "Origami-inspired electret-based triboelectric generator for biomechanical and ocean wave energy harvesting." Nano Energy 67 (January 2020): 104197. http://dx.doi.org/10.1016/j.nanoen.2019.104197.

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Chiba, S., M. Waki, T. Wada, Y. Hirakawa, K. Masuda, and T. Ikoma. "Consistent ocean wave energy harvesting using electroactive polymer (dielectric elastomer) artificial muscle generators." Applied Energy 104 (April 2013): 497–502. http://dx.doi.org/10.1016/j.apenergy.2012.10.052.

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Lee, Kwangseok, Jeong-won Lee, Kihwan Kim, Donghyeon Yoo, Dong Kim, Woonbong Hwang, Insang Song, and Jae-Yoon Sim. "A Spherical Hybrid Triboelectric Nanogenerator for Enhanced Water Wave Energy Harvesting." Micromachines 9, no. 11 (November 15, 2018): 598. http://dx.doi.org/10.3390/mi9110598.

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Water waves are a continuously generated renewable source of energy. However, their random motion and low frequency pose significant challenges for harvesting their energy. Herein, we propose a spherical hybrid triboelectric nanogenerator (SH-TENG) that efficiently harvests the energy of low frequency, random water waves. The SH-TENG converts the kinetic energy of the water wave into solid–solid and solid–liquid triboelectric energy simultaneously using a single electrode. The electrical output of the SH-TENG for six degrees of freedom of motion in water was investigated. Further, in order to demonstrate hybrid energy harvesting from multiple energy sources using a single electrode on the SH-TENG, the charging performance of a capacitor was evaluated. The experimental results indicate that SH-TENGs have great potential for use in self-powered environmental monitoring systems that monitor factors such as water temperature, water wave height, and pollution levels in oceans.

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Feng, Li, Guanlin Liu, Hengyu Guo, Qian Tang, Xianjie Pu, Jie Chen, Xue Wang, Yi Xi, and Chenguo Hu. "Hybridized nanogenerator based on honeycomb-like three electrodes for efficient ocean wave energy harvesting." Nano Energy 47 (May 2018): 217–23. http://dx.doi.org/10.1016/j.nanoen.2018.02.042.

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Wu, Yan, Qixuan Zeng, Qian Tang, Wenlin Liu, Guanlin Liu, Ying Zhang, Jun Wu, Chenguo Hu, and Xue Wang. "A teeterboard-like hybrid nanogenerator for efficient harvesting of low-frequency ocean wave energy." Nano Energy 67 (January 2020): 104205. http://dx.doi.org/10.1016/j.nanoen.2019.104205.

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Jurado, Ulises Tronco, Suan Hui Pu, and Neil M. White. "Grid of hybrid nanogenerators for improving ocean wave impact energy harvesting self-powered applications." Nano Energy 72 (June 2020): 104701. http://dx.doi.org/10.1016/j.nanoen.2020.104701.

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31

Du, Xiaozhen, Yan Zhao, Guilin Liu, Mi Zhang, Yu Wang, and Hong Yu. "Enhancement of the Piezoelectric Cantilever Beam Performance via Vortex-Induced Vibration to Harvest Ocean Wave Energy." Shock and Vibration 2020 (September 14, 2020): 1–11. http://dx.doi.org/10.1155/2020/8858529.

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Renewable and sustainable energies exhibit promising performance while serving as the power supply of a wireless sensor especially located in marine waters. Various microgenerators have been developed to harvest wave energy. However, the conversion ability from a dynamic oscillating source of wave is crucial to enhance their effectiveness in practical applications. In this paper, a new piezoelectric converter system is proposed to harvest the kinetic energy from ocean waves. The vortex-induced effect in an air channel enhances the vibration performance, improving the energy harvesting efficiency. The system comprises an oscillating water column (OWC) air chamber, a bluff body, and a piezoelectric piece for electromechanical transduction. The fluid–solid–electric coupling finite element method was used to investigate the relation between the output voltage and geometrical parameters, including the size and position of the piezoelectric cantilever beam, which is based on the user-defined function of the ANSYS. It is found that the bluff body in the outlet channel above the air chamber induced high-frequency vortex shedding vibration. The regular wave rushed into the air chamber with a frequency of 0.285 Hz and extruded the air across the bluff body in the outlet channel. This incurred the fluctuation of the air pressure and excited the piezoelectric cantilever beam vibration with a high frequency of 233 Hz in the wake region. Furthermore, a continuous electrical output with a peak voltage of 6.11 V is generated, which has potential applications for the wireless sensors on the marine buoy.

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Mutsuda, Hidemi, Yoshikazu Tanaka, Yasuaki Doi, and Yasuo Moriyama. "Application of a flexible device coating with piezoelectric paint for harvesting wave energy." Ocean Engineering 172 (January 2019): 170–82. http://dx.doi.org/10.1016/j.oceaneng.2018.11.014.

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Raj, Rishav, R. Anandanarayanan, Suchithra Ravikumar, Prasad Dudhgaonkar, and Abdus Samad. "Wave energy harvesting impulse turbine having ring type blade: Experiments with unsteady flow." Ocean Engineering 236 (September 2021): 109553. http://dx.doi.org/10.1016/j.oceaneng.2021.109553.

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Shirai, Haruhiko, Hiromichi Mitamura, Nobuaki Arai, and Kazuyuki Moriya. "Study of Energy Harvesting from Low-Frequency Vibration with Ferromagnetic Powder and Non-magnetic Fluid." Plasmonics 15, no. 2 (November 23, 2019): 559–71. http://dx.doi.org/10.1007/s11468-019-01067-9.

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AbstractThe movement of the creature and the almost wave in the ocean is a low vibration of random energy with a frequency range of 0.1–10 Hz. Because of its low frequency, the opinion has been that electrical energy generation from this low-frequency wave motion through the electromagnetic induction method is difficult. In this study, an electrical generator was created by the electromagnetic induction method by putting a small mass of ferromagnetic powder in nonmagnetic fluid. A broadband vibration energy harvesting model was created in which vibrations are broadened through a multi-degree of freedom oscillation system using ferromagnetic powder. To generate electricity from low-frequency vibrations (1 Hz or less), a non-resonant type model was created by adding fluid to the ferromagnetic powder model and the simulation results confirmed using computational fluid dynamics by creating a working energy harvesting device.

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Suryawanshi, Sagar. "A Review on Mechanical Motion Rectifier for Energy Harvesting." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 2007–16. http://dx.doi.org/10.22214/ijraset.2021.37680.

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Abstract: The conventional vehicle suspension dissipates the mechanical vibration energy in the form of heat which waste considerable energy. The regenerative suspensions have attracted much attention in recent years for the improvement of vibration attenuating performance as well as the reduction of energy dissipation. In fact, the vibrations in some situations can be very large, for example, the vibrations of tall buildings, long vehicle systems, railroads and ocean waves. With the global concern on energy and environmental issues, energy harvesting from large-scale vibrations is more attractive. This paper introduces the existing research and significance of regenerative shock absorbers and reviews the potential of automotive vibration energy recovery techniques; then, it classifies and summarizes the general classifications of regenerative shock absorbers. Keywords: Mechanical vibration, regenerative suspension, energy dissipation, railroads, ocean waves, vehicle.

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Rodrigues, C., D. Nunes, D. Clemente, N. Mathias, J. M. Correia, P. Rosa-Santos, F. Taveira-Pinto, T. Morais, A. Pereira, and J. Ventura. "Emerging triboelectric nanogenerators for ocean wave energy harvesting: state of the art and future perspectives." Energy & Environmental Science 13, no. 9 (2020): 2657–83. http://dx.doi.org/10.1039/d0ee01258k.

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This review details the groundwork made in the most recent years on the development of TENGs for wave energy conversion systems and discusses future perspectives in the scope of autonomous, self-powered sensor buoys and other offshore floating platforms.

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Xie, X. D., Q. Wang, and N. Wu. "Energy harvesting from transverse ocean waves by a piezoelectric plate." International Journal of Engineering Science 81 (August 2014): 41–48. http://dx.doi.org/10.1016/j.ijengsci.2014.04.003.

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DOSTAL, L., and M. A. PICK. "Theoretical and experimental study of a pendulum excited by random loads." European Journal of Applied Mathematics 30, no. 5 (September 18, 2018): 912–27. http://dx.doi.org/10.1017/s0956792518000529.

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Results on the behaviour of a pendulum which is parametrically excited by large amplitude random loads at its pivot are presented, including a novel experimental case study. Thereby, it is dealt with a random excitation by a non-white Gaussian stochastic process with prescribed spectral density. Special focus is devoted to stochastic processes resulting from random sea wave elevation and the question whether random sea waves can lead to rotational motion of the parametrically excited pendulum. The motivation for such an experimental study is energy harvesting from ocean waves.

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Sarmiento, J., A. Iturrioz, V. Ayllón, R. Guanche, and I. J. Losada. "Experimental modelling of a multi-use floating platform for wave and wind energy harvesting." Ocean Engineering 173 (February 2019): 761–73. http://dx.doi.org/10.1016/j.oceaneng.2018.12.046.

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Ucar, Hakan. "Patch-based piezoelectric energy harvesting on a marine boat exposed to wave-induced loads." Ocean Engineering 236 (September 2021): 109568. http://dx.doi.org/10.1016/j.oceaneng.2021.109568.

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Liu, Hengxu, Feng Yan, Yeqing Jin, Weiqi Liu, Hailong Chen, and Fankai Kong. "Hydrodynamic and Energy Capture Properties of a Cylindrical Triboelectric Nanogenerator for Ocean Buoy." Applied Sciences 11, no. 7 (March 30, 2021): 3076. http://dx.doi.org/10.3390/app11073076.

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It is rather challenging to collect ocean wave energy at high efficiency because of its ultra-low frequencies and variable amplitudes. Triboelectric Nanogenerator (TENG) technology is more suitable for harvesting low-frequency than electromagnetic power generation technology. In this work, we designed a built-in cylindrical Triboelectric Nanogenerator (C-TENG) installed inside the ocean buoy (BUOY-41). The hydrodynamic properties of the C-TENG are consistent with the ocean buoy, which are calculated by CFD software (Star-CCM+). The Energy Capture Properties of the C-TENG are established by the finite element software (COMSOL). The C-TENG has high power density (30 mW/m2) and can meet the power demand of the ocean buoy (10 mW). The implementation of the present work is of great academic value and practical significance for the development of efficient marine renewable energy conversion technology, enhancement of marine equipment energy replenishment, enrichment of hydrodynamic theories and revealing of the complex mechanisms.

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42

Darabi, Amir, and Michael J. Leamy. "Clearance-type nonlinear energy sinks for enhancing performance in electroacoustic wave energy harvesting." Nonlinear Dynamics 87, no. 4 (November 4, 2016): 2127–46. http://dx.doi.org/10.1007/s11071-016-3177-3.

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43

Thiam, Amadou G., and Allan D. Pierce. "Electromechanical transduction system design for optimal energy harvesting from ocean waves." Journal of the Acoustical Society of America 130, no. 4 (October 2011): 2504. http://dx.doi.org/10.1121/1.3654975.

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44

Alam, Mohammad-Reza. "Nonlinear analysis of an actuated seafloor-mounted carpet for a high-performance wave energy extraction." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2146 (June 13, 2012): 3153–71. http://dx.doi.org/10.1098/rspa.2012.0193.

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It is known that muddy seafloors can extract significant energy from overpassing surface waves via engaging them in strong interaction processes. If a synthetic seabed can respond to the action of surface gravity waves similar to the mud response, then it too can take out a lot of energy from surface waves. Analysis of the performance of a mud-resembling seabed carpet in harvesting ocean wave energy is the subject of this article. Specifically, and on the basis of the field measurements and observations of properties/responses of seafloor mud, we focus our attention on an artificial viscoelastic seabed carpet composed of (vertically acting) linear springs and generators. We show that the system of sea/synthetic-carpet admits two propagating wave solutions: the surface mode and the bottom mode. The damping of a surface-mode wave is proportional to its wavelength and hence is classic. However, the damping of a bottom-mode wave is larger for shorter waves, and is in general stronger than that of the surface-mode wave. To address the effect of (high-order) nonlinear interactions as well as to investigate the performance of our proposed carpet of wave energy conversion (CWEC) against a spectrum of waves, we formulate a direct simulation scheme based on a high-order spectral method. We show, by taking high-order nonlinear interactions into account, that the CWEC efficiency can be significantly higher for steeper waves. We further show that the bandwidth of high performance of the CWEC is broad, it yields minimal wave reflections and its theoretical efficiency asymptotically approaches unity within a finite and (relatively) short extent of deployment.

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Ranjith, B., Paresh Halder, and Abdus Samad. "High-performance ocean energy harvesting turbine design – Detailed flow analysis with blade leaning strategy." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 3 (September 19, 2018): 379–96. http://dx.doi.org/10.1177/0957650918787692.

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Oscillating water column wave energy converter is having low efficiency because of its principal component, a bidirectional turbine. An analysis of the internal flow of the turbine gives an idea of improving the performance through optimization of geometrical parameters. In this study, an impulse turbine of 0.3 m diameter with fixed guide vanes is numerically simulated by solving three-dimensional incompressible steady Reynolds averaged Navier-stokes equation with two-equation turbulence closure model. This study shows that the numerical results very well match with the experimental results. The detailed flow physics demonstrates that different types of losses occur in this type of turbine and shows that the downstream diverging path of the rotor and guide vane is responsible for low performance. In this study, the effect of guide vane lean, as well as the combined rotor and guide vane lean on the performance of the turbine, has been discussed in detail and found to increase the efficiency of the turbine.

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Li, Yamei, Zeyu Li, Andong Liu, Yutian Zhu, Shiming Wang, and Zhao Liu. "Research on the Blade Motion of a Bidirectional Energy-Generating Turbine under Integrated Wave and Tidal Current Action." Journal of Marine Science and Engineering 9, no. 8 (August 12, 2021): 869. http://dx.doi.org/10.3390/jmse9080869.

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An integrated wave-tidal current power turbine is affected by both wave and tidal current forces, and its energy efficiency is closely related to the velocity and direction of the two forces. To improve the probability of the horizontal axis turbine reaching maximum energy efficiency under real-time changing sea conditions, we performed the following investigations in this study. Based on the actual application scenario of Lianyungang port, a time series prediction model of tidal current (velocity and flow direction) and wave (mean wave direction, mean wave period, and significant wave height) data for the past year was established. The changes in waves and tidal currents within 24 h after the cutoff point of the existing data were predicted. The integrated wave-tidal current mechanism was studied, and the superposition of wave energy and tidal current energy was transformed into the equivalent velocity vector of wave-tidal current integration. The conversion coefficient between waves and equivalent flows was determined by a numerical wave flume simulation. According to the historical wave and tidal current data, the equivalent velocity range of the integrated action of waves and tidal currents in Lianyungang was determined. The influence of different blade motions on the energy harvesting efficiency of the turbine under the corresponding flow conditions was studied using the Computational Fluid Dynamics (CFD) method to determine the blade motion law of the turbine. The blade motion law of the prototype was verified in a sea trial experiment. The experimental results were basically consistent with the simulation results for the blade motion law designed according to the wave and tidal current prediction law. This design scheme can provide a reference for engineering design for the development and utilization of new marine energy.

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Liu, Liqiang, Xiya Yang, Leilei Zhao, Hongxin Hong, Hui Cui, Jialong Duan, Qianming Yang, and Qunwei Tang. "Nodding Duck Structure Multi-track Directional Freestanding Triboelectric Nanogenerator toward Low-Frequency Ocean Wave Energy Harvesting." ACS Nano 15, no. 6 (May 7, 2021): 9412–21. http://dx.doi.org/10.1021/acsnano.1c00345.

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Rodrigues, C., M. Ramos, R. Esteves, J. Correia, D. Clemente, F. Gonçalves, N. Mathias, et al. "Integrated study of triboelectric nanogenerator for ocean wave energy harvesting: Performance assessment in realistic sea conditions." Nano Energy 84 (June 2021): 105890. http://dx.doi.org/10.1016/j.nanoen.2021.105890.

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Kim, Inkyum, and Daewon Kim. "3D Printed Double Roller-Based Triboelectric Nanogenerator for Blue Energy Harvesting." Micromachines 12, no. 9 (September 10, 2021): 1089. http://dx.doi.org/10.3390/mi12091089.

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The ocean covers 70% of the earth’s surface and is one of the largest uncultivated resources still available for harvesting energy. The triboelectric energy harvesting technology has the potential to effectively convert the ocean’s “blue energy” into electricity. A half-cylinder structure including rollers floating on the water has already been used, in which the pendulum motion of the rollers is driven by the waveform. For the stable motion of the rollers, the printed surface of the device was treated with acetone for attaining hydrophilicity. The electrical outputs with the proposed device were enhanced by increasing the contact surface area by simply implementing the double roller structure with double side-covered electrodes. With the optimized structure, the maximum power density reached a value of 69.34 µW m−2 at a load resistance of 200 MΩ with the device’s high output durability. Finally, the fabricated device was also applied to the artificial water waves to demonstrate the possibility of using this device in the ocean. By simply modifying the electrode structure and adding a roller, this device demonstrated the ability to generate over 160% of electrical output with the same covered area of the ocean by the triboelectric nanogenerators (TENGs) and potential ocean application.

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Lin, Gui Juan, and Ke Sheng Wang. "A Novel Wind Power Micro-Generator Research on Dielectric Electro Active Polymer." Advanced Materials Research 1039 (October 2014): 415–26. http://dx.doi.org/10.4028/www.scientific.net/amr.1039.415.

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Wind power is emerging as a particularly attractive form of renewable energy. The predomination of Dielectric Electric Active Polymer (DEAP) has been shown to operate in transforming mechanical strain energy to electrical energy as generator mode. Their characteristics make them potentially well suited for wind power takeoff systems. In this article, a novel DEAP micro generator is successfully developed about mechanical-electro energy conversion model. The proposed energy harvesting is based on capacity change induced by the mechanical strain. With the Mooney-Rivlin model, the theoretical modeling of energy harvesting cycle are analyzed. To verify the theoretical analysis, the prototype has been set up on the DEAP wind power micro-generator in this work. Many experiments were performed to verify the usability of the proposed DEAP generator method. These experimental investigations coincide with the energy conversion theory analytical model. The DEAPs have been proved to provide electrical energy with density as high as 1.5J.g-1.This value is much higher compared with the density of piezoelectric polymer (0.3J.g-1). The work will push forward the practical use of wave power for supplying general electrical needs, and supply theoretical foundation for potential applications such as ocean wave power.

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Journal articles on the topic 'Ocean wave energy harvesting'

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