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Study on the marine growth effect on the dynamic response of offshore wind turbines

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Abstract

Jacket foundation is regarded as a suitable solution for wind turbines in the intermediate water depths ranging from 30 to 80 m. Numerous types of marine fouling organisms may be found on the submerged members of jacket. Marine growth is found to influence loading of offshore structures by increasing tube diameters, drag coefficient, mass and hydrodynamic added mass and structural weight. In this paper, the types and distribution of marine growth are mentioned. We aimed to investigate the effects of marine growth with different thicknesses, densities and hydrodynamic coefficients values on characteristics of an offshore wind turbine with jacket foundation. The eigen analysis shows that the marine growth has a little effect on the first order natural frequencies while it has higher effect on second and third order natural frequencies of the support structure. Thickness and density have a strong effect on hydrodynamic loads. To obtain the properties of marine growth and hydrodynamic coefficients in the design of offshore wind turbines, full-scale measurements are needed.

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Abbreviations

Dc :

“clean” outer diameter

D:

effective diameter

k:

average peak-to-valley height of “hard” growth organisms

t:

average growth thickness

e:

relative roughness

λ:

wave length

H:

wave height

F:

the force per unit length of member

F d :

the drag force

F m :

the inertia force

F l :

the lift force

Cd :

the drag coefficient

Cm :

the inertia coefficient

ρ:

the density of water, D is the effective diameter

uw :

resolved velocity of the flow normal to the member

\(\dot u_w\) :

acceleration of the flow normal to the member

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk, South Korea, 790-784

    Wei Shi

  2. Graduate School of Wind Energy, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk, South Korea, 790-784

    Hyun-Chul Park & Jae-Ha Baek

  3. Mechanical Design and Production Engineering, Konkuk University, Seoul, South Korea, 143-701

    Chang-Wan Kim

  4. Pohang Wind Energy Research Center, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk, South Korea, 790-784

    Young-Chan Kim

  5. School of Naval Architecture & Ocean Engineering, University of Ulsan, Ulsan, South Korea, 680-749

    Hyun-Kyoung Shin

Authors
  1. Wei Shi
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  2. Hyun-Chul Park
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  3. Jae-Ha Baek
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  4. Chang-Wan Kim
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Correspondence to Hyun-Chul Park.

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Shi, W., Park, HC., Baek, JH. et al. Study on the marine growth effect on the dynamic response of offshore wind turbines. Int. J. Precis. Eng. Manuf. 13, 1167–1176 (2012). https://doi.org/10.1007/s12541-012-0155-7

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  • DOI: https://doi.org/10.1007/s12541-012-0155-7

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