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Physical and Mathematical Modeling of a Wave Energy Converter Equipped with a Negative Spring Mechanism for Phase Control

Author

Listed:
  • Amélie Têtu

    (Department of Civil Engineering, Aalborg University, DK-9220 Aalborg, Denmark)

  • Francesco Ferri

    (Department of Civil Engineering, Aalborg University, DK-9220 Aalborg, Denmark)

  • Morten Bech Kramer

    (Department of Civil Engineering, Aalborg University, DK-9220 Aalborg, Denmark)

  • Jørgen Hals Todalshaug

    (Department of Marine Technology, Norwegian University of Science and Technology (NTNTU), NO-7491 Trondheim, Norway
    CorPower Ocean AB, 114 28 Stockholm, Sweden)

Abstract

A wave-energy converter has been studied through the combination of laboratory experiments and numerical simulations. The converter model is a semi-submerged axi-symmetric buoy with a circular cross section with a diameter of 26 cm at the water plane. The buoy is pitching about a fixed external axis oriented such that the buoy works primarily in heave. The laboratory model is equipped with a spring mechanism referred to as WaveSpring, which works to shift the resonance period and increase the response bandwidth of the system. A controlled electric actuator was connected and programmed to provide a velocity-proportional force for power extraction. The buoy mass was varied at two levels and the experimental setup was exposed to a selection of regular and irregular waves. The power take-off (PTO) damping was set as a function of sea state. A mathematical model for global motion response was developed based on linear hydrodynamic theory and rigid-body dynamics. Comparison of laboratory measurements and numerical simulation results shows that the dominant physical effects have been well captured by the mathematical model. Overall, the study gives an experimental verification that a negative spring mechanism mounted in parallel with the power take-off machinery of a wave energy converter may be used to increase the average converted power.

Suggested Citation

  • Amélie Têtu & Francesco Ferri & Morten Bech Kramer & Jørgen Hals Todalshaug, 2018. "Physical and Mathematical Modeling of a Wave Energy Converter Equipped with a Negative Spring Mechanism for Phase Control," Energies, MDPI, vol. 11(9), pages 1-23, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2362-:d:168374
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    References listed on IDEAS

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    1. Scott Beatty & Francesco Ferri & Bryce Bocking & Jens Peter Kofoed & Bradley Buckham, 2017. "Power Take-Off Simulation for Scale Model Testing of Wave Energy Converters," Energies, MDPI, vol. 10(7), pages 1-22, July.
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    Cited by:

    1. Aqiang Zhao & Weimin Wu & Zuoyao Sun & Lixun Zhu & Kaiyuan Lu & Henry Chung & Frede Blaabjerg, 2019. "A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters," Energies, MDPI, vol. 12(7), pages 1-19, April.
    2. Qiao Li & Motohiko Murai & Syu Kuwada, 2018. "A Study on Electrical Power for Multiple Linear Wave Energy Converter Considering the Interaction Effect," Energies, MDPI, vol. 11(11), pages 1-20, November.
    3. Raúl Cascajo & Emilio García & Eduardo Quiles & Antonio Correcher & Francisco Morant, 2019. "Integration of Marine Wave Energy Converters into Seaports: A Case Study in the Port of Valencia," Energies, MDPI, vol. 12(5), pages 1-24, February.
    4. Luca Martinelli & Matteo Volpato & Chiara Favaretto & Piero Ruol, 2019. "Hydraulic Experiments on a Small-Scale Wave Energy Converter with an Unconventional Dummy Pto," Energies, MDPI, vol. 12(7), pages 1-12, March.
    5. Zhang, Xiantao & Tian, XinLiang & Xiao, Longfei & Li, Xin & Lu, Wenyue, 2019. "Mechanism and sensitivity for broadband energy harvesting of an adaptive bistable point absorber wave energy converter," Energy, Elsevier, vol. 188(C).
    6. Wei Peng & Yingnan Zhang & Xueer Yang & Jisheng Zhang & Rui He & Yanjun Liu & Renwen Chen, 2020. "Hydrodynamic Performance of a Hybrid System Combining a Fixed Breakwater and a Wave Energy Converter: An Experimental Study," Energies, MDPI, vol. 13(21), pages 1-21, November.

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