| Description |
1 online resource (13 pages) : color illustrations. |
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text txt rdacontent |
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computer c rdamedia |
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online resource cr rdacarrier |
| Series |
NREL/CP ; 5700-81883 |
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Conference paper (National Renewable Energy Laboratory (U.S.)) ; 5700-81883.
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| Note |
In scope of the U.S. Government Publishing Office Cataloging and Indexing Program (C&I) and Federal Depository Library Program (FDLP). |
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"Presented at ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering (OMAE2022), Hamburg, Germany, June 5-10, 2022"--Cover. |
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"June 2022." |
| Bibliography |
Includes bibliographical references (pages 12-13). |
| Funding |
DE-AC36-08GO28308 |
| Note |
Description based on online resource; title from PDF title page (NREL, viewed October 21, 2022). |
| Summary |
Oceans are a harsh environment and can impose significant loads on deployed structures. Deployment of wave energy converters (WECs) faces a design challenge with apparently contradictory goals. A WEC should be designed to maximize the energy absorbed while ensuring the operating wave condition does not exceed the failure limits of the device itself. Therefore, the loads endured by the support structure are a design constraint for the system. Adaptability to different sea states is, therefore, highly desirable. This work uses a WEC-Sim model of a Variable Geometry Oscillating Wave Energy Converter (VGOSWEC) mounted on a support structure simulated under different wave scenarios. A VGOSWEC resembles a paddle pitching about a fixed hinge perpendicular to the incoming waves-fronts. Therefore, the hinge experiences loads perpendicular to its axis as it maintains its position. The geometry of the VGOSWEC was varied by opening a series of controllable flaps on the pitching paddle when the structure experiences threshold loads. Since opening the flaps lets the waves transmit through the paddle, it is hypothesized that opening the flaps should result in load shedding at the base of the support structure. This load shedding is achieved by reducing the moments about the hinge axis. This work compares the hydrodynamic coefficients, natural periods, and Response Amplitude Operators (RAOs) from completely closed to completely open configurations of the controllable flaps. These comparisons quantify the effects of letting the waves transmit through the VGOSWEC. This work shows that the completely open configuration can reduce the pitch and surge loads on the base of the support structure by as much as 80%. It was observed that at the paddle's resonance frequency, the loads on the structure increased substantially. This increase in loads can be mitigated by a rotational Power Take-off (PTO) damping about the hinge axis. Changing the rotational PTO damping was identified as an additional design parameter that can be used to control the loads experienced by the WEC's support structure. |
| Subject |
Ocean wave power -- United States.
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Ocean engineering -- United States.
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Offshore structures -- United States -- Design and construction.
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Hydrodynamics.
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Énergie des vagues -- États-Unis.
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Océanographie appliquée -- États-Unis.
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Hydrodynamique.
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Hydrodynamics
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Ocean engineering
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Ocean wave power
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Offshore structures -- Design and construction
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United States https://id.oclc.org/worldcat/entity/E39PBJtxgQXMWqmjMjjwXRHgrq
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| Indexed Term |
fixed and floating structures |
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marine hydrodynamics |
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ocean engineering |
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power take-off |
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wave energy converter |
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wave loads |
| Added Author |
National Renewable Energy Laboratory (U.S.), issuing body.
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United States. Department of Energy. Water Power Technologies Office, sponsoring body.
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| Standard No. |
1873496 OSTI ID |
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0000-0001-6044-2845 |
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0000-0002-8489-312X |
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0000-0001-5902-5139 |
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP 5700-81883 |
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