Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off
An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-09-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/9/2332 |
| _version_ | 1811213000375271424 |
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| author | Simon Thomas Marianna Giassi Malin Göteman Martyn Hann Edward Ransley Jan Isberg Jens Engström |
| author_facet | Simon Thomas Marianna Giassi Malin Göteman Martyn Hann Edward Ransley Jan Isberg Jens Engström |
| author_sort | Simon Thomas |
| collection | DOAJ |
| description | An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device shows some beneficial characteristics, making it an interesting option for full scale devices: For similar weights the inertia can be significantly higher than for linear generators, allowing it to operate with natural frequencies close to typical wave frequencies. The influence of the higher inertia on the power absorption is tested using both a numerical simulation and physical wave tank tests. With the increased inertia the PTO is able to absorb more than double the energy of a comparable direct-driven linear generator in some sea states. Moreover, the alternating rotatory generator allows the absorption characteristic to be tuned by changing the inertia and the generator damping. |
| first_indexed | 2024-04-12T05:38:48Z |
| format | Article |
| id | doaj.art-6c79996bbcdc48dbb6b97a3afdfc049b |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T05:38:48Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6c79996bbcdc48dbb6b97a3afdfc049b2022-12-22T03:45:43ZengMDPI AGEnergies1996-10732018-09-01119233210.3390/en11092332en11092332Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-offSimon Thomas0Marianna Giassi1Malin Göteman2Martyn Hann3Edward Ransley4Jan Isberg5Jens Engström6Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, SwedenLägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, SwedenLägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, SwedenSchool of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UKSchool of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UKLägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, SwedenLägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, SwedenAn alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device shows some beneficial characteristics, making it an interesting option for full scale devices: For similar weights the inertia can be significantly higher than for linear generators, allowing it to operate with natural frequencies close to typical wave frequencies. The influence of the higher inertia on the power absorption is tested using both a numerical simulation and physical wave tank tests. With the increased inertia the PTO is able to absorb more than double the energy of a comparable direct-driven linear generator in some sea states. Moreover, the alternating rotatory generator allows the absorption characteristic to be tuned by changing the inertia and the generator damping.http://www.mdpi.com/1996-1073/11/9/2332wave energypower take-offdirect-drivenwave tank testphysical scale modelnatural frequency tuningfloating point absorber |
| spellingShingle | Simon Thomas Marianna Giassi Malin Göteman Martyn Hann Edward Ransley Jan Isberg Jens Engström Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off Energies wave energy power take-off direct-driven wave tank test physical scale model natural frequency tuning floating point absorber |
| title | Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off |
| title_full | Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off |
| title_fullStr | Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off |
| title_full_unstemmed | Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off |
| title_short | Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off |
| title_sort | performance of a direct driven wave energy point absorber with high inertia rotatory power take off |
| topic | wave energy power take-off direct-driven wave tank test physical scale model natural frequency tuning floating point absorber |
| url | http://www.mdpi.com/1996-1073/11/9/2332 |
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