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| 2. |
- Göteman, Malin, 1980-, et al.
(author)
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Fluid dynamics and wave-structure interactions
- 2022
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In: Modelling and Optimization of Wave Energy Converters. - Boca Raton; Abingdon : CRS Press. - 9781032057392 - 9781032057408 - 9781003198956 ; , s. 61-96
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Book chapter (other academic/artistic)
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| 3. |
- Wu, Jinming, et al.
(author)
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Investigation on the wave energy converter that reacts against an internal inverted pendulum
- 2022
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In: Energy. - : Elsevier. - 0360-5442 .- 1873-6785. ; 247
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Journal article (peer-reviewed)abstract
- In this work, a wave energy converter (WEC) that reacts against an internal inverted pendulum, which works as an inertial device to provide reaction for power absorption and is potentially superior due to its natural high elevation of the internal mass compared to a normal pendulum, named IPWEC has been studied. Optimal structural configurations of the WEC have been identified by a genetic algorithm. The equations of motion have been defined and solved explicitly using a linearized model, which has been validated by experiments and a non-linearized model. When comparing IPWEC with the WEC that reacts against a normal pendulum (NPWEC), it is found that, although both WECs present almost the same wave power capture ability, IPWEC possesses several advantages in most sea states due to the naturally high elevation of the pendulum's center of gravity: (1) the pendulum mass and the angular motion amplitude of the pendulum are 35% and 50%, respectively, smaller than those of NPWEC; (2) the averaged reactive power required under complex conjugate control is 75% smaller than NPWEC; (3) the moment which holds the pendulum fixed relative to the hull in the survival mode is merely a half as large as that of NPWEC.
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| 4. |
- Zhu, Guixun, et al.
(author)
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Experimental study of interactions between focused waves and a point absorber wave energy converter
- 2023
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In: Ocean Engineering. - : Elsevier. - 0029-8018 .- 1873-5258. ; 287
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Journal article (peer-reviewed)abstract
- Predicting the response of point absorber wave energy converters (WECs) in extreme sea states is crucial for assessing their survivability. However, data are scarce and hydrodynamic understanding is limited. In order to simulate extreme wave conditions, laboratory-scale focused waves based on NewWave theory have been utilized. To investigate the interactions between focused waves and a point absorber WEC, a wave basin experiment has been conducted. Various parameters, including focusing amplitude and peak frequency have been examined across three different damping conditions. The motion response of the point absorber WEC and the corresponding mooring force have been measured over time. The experimental findings reveal that both the focused wave parameters and the damping values have a significant influence on the motion response and mooring force. It is shown that an increase in the focusing amplitude leads to a more intense motion response, while the mooring force is relatively insensitive to the focused amplitude/peak frequency when the end-stop spring is not compressed. The force in the connection line is maximized when the upper end-stop spring is compressed. As the peak frequency increases, the heave and surge responses decrease, whereas the maximum mooring force increases with peak frequency for a locked power take-off (PTO) system. Finally, the results indicate that optimizing the design of the power take-off system, including selecting appropriate damping values and stroke lengths for the translator, can significantly reduce the mooring load for extreme wave conditions.
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