An octo-generator for energy harvesting based on the piezoelectric effect |
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| Affiliation: | 1. College of Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong;1. Department of Mechanical Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;2. School of Mechanical and Automotive Engineering, Hubei University of Arts and Science, Xiangyang, Hubei 441053, PR China;3. Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong;4. Department of Civil and Engineering, The University of British Columbia, Vancouver BC V6T 1Z4, Canada;1. Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China;2. Shenzhen Key Laboratory of 3rd Generation Semiconductor Devices, Shenzhen, China;3. Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Building 345E, DK-2800 Kgs Lyngby, Denmark;4. School of Electronic and Information Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;5. State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;1. School of Mechanical and Automotive Engineering, Hubei University of Arts and Science, Xiangyang, Hubei 441053, China;2. Department of Civil and Architectural Engineering, City University of Hong Kong, Kowloon, Hong Kong;3. Department of Mechanical Engineering, Khalifa University, PO Box 127788, Abu Dhabi, United Arab Emirates;1. Department of Materials Science and Engineering, Glenn Howatt Electroceramics Laboratory, Rutgers University, Piscataway, NJ, USA;2. Center for Advanced Infrastructure and Transportation, Rutgers University, Piscataway, NJ, USA;1. Department of Mechanics, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates;2. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, PR China |
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| Abstract: | A renewable energy harvester using the piezoelectric effect is developed for the ocean tidal and wind flow. The harvester is made of connected driving blades to an octo-generator, which has a rotator with n blades and a stator attached by eight mass-spring-piston-cylinder-piezoelectricity devices. The resonance and force magnification are utilized to increase the power output of the harvester. A corresponding mathematical model is developed to calculate the root mean square of the generated electric power. The simulation results indicate that the generated power is largely enhanced when the near-resonant condition is established. The power increases with increases in the magnetic flux density, the large-to-small diameter ratio of the cylinder, the size of magnetic bar face, and decreases in the gap between two magnetic faces and the size of the piezoelectric bar face. A generated power of 5 kW is realized by the harvester working under an ocean tidal speed, V = 1.75 m/s, and its geometric and material properties of driving length L = 7.5 m, spring constant kv = 65000 N/m, gap between the two magnets s = 0.0015 m, large to small diameter ratio of the cylinder z = 6, and magnetic flux density Br = 1.45 T. |
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| Keywords: | Energy harvesting Piezoelectricity Magnet Wind flow Tidal current Renewable energy |
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