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Load analysis and structural strength evaluation of semi-submersible platform for wind turbines in Jeju Island sea states using hydrodynamic-structure interaction analysis

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Abstract

The present study conducted an analysis of waves and wind on the west coast of Jeju Island in South Korea to derive the loads for a structural analysis under operational, extreme, and survival conditions and then evaluated the structural strength of the DeepCwind semi-submersible platform of NREL for 5 MW wind turbine. As a floating structure is exposed to wind and wave loads in a highly changeable marine environment and consists of tubular joints with slender-element members, a load analysis is necessary for strength evaluation and design of the structure. The wave scatter diagrams based on KORDI’s 24-year measurements of sea states and the annual mean wind speeds were used as the operational conditions. A sea state with a period that is very likely to cause the resonance of a floating structure was applied as the extreme condition. Another sea state during the Bolaven, a typhoon passing west of Jeju Island in 2000, is adopted as the survival condition. The surface pressure distribution of DeepCwind calculate through hydrodynamic analysis was applied to a structural analysis model based on a hydrodynamic-structure interaction analysis. The evaluation of the structural strength is performed in accordance with the provisions of DNV-OS-C201 and API-2A-WSD under operational, extreme, and survival conditions.

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Abbreviations

ρ :

Density of sea water, normally 1025 [kg/m3]

g :

Acceleration of gravity [m/s2]

ζ a :

Significant wave amplitude [m]

ω :

Wave angular frequency [rad/s]

k :

Wave number [1/m], k = ω2 / g

x, z:

Horizontal and vertical CoG coordinates for the individual main items of the lifted object [m]

η a :

Largest vertical single amplitude crane tip motion [m]

ω n :

Circular frequency of the vertical motion of the lifted object [rad/s]

ε :

Phase angle between wave and crane tip motion [rad]

M:

Mass of object item in air [kg]

A33 :

Added mass of object item [kg]

C s :

Slamming coefficient

AS :

Slamming area projected on a horizontal plane [m]

C D :

Drag coefficient of object item

Ap :

Area of object item projected on a horizontal plane [m2]

H s :

Significant height [m]

T p :

Peak period [s]

H max :

Maximum height of wave [m]

T H_max :

Period of max H [s]

f h :

Membrane stress [Pa]

F hc :

Critical hoop buckling stress [Pa]

SF k :

Buckling safety factor

C h :

Critical hoop buckling coefficient

σ aN :

Allowable stresses at normal condition [Pa]

σ aE :

Allowable stresses at extreme condition [Pa]

SF N :

Safety factor at normal condition

SF E :

Safety factor at extreme condition

L :

Length of tubular members [mm]

t:

Thickness of tubular member [mm]

D:

Diameter of tubular members [mm]

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C1090228, No. 2019R1H1A2080082) and the Technology Innovation Program (20004627) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. Graduate School of Mechanical Design Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Korea

    Dong-Chan Lee & Seunghyeon Cho

  2. Department of Mechanical Engineering, Hanyang University, Ansan, 426-791, Korea

    Hyun-ik Yang

  3. POSCO Technical Research Laboratories, Process Engineering Research Lab., Thermo-Fluid & Process Research Group, 6261, Donghaean-ro, Nam-gu, Pohang-si, 37859, Korea

    Sang-kwon Na

  4. School of Mechanical Engineering, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Korea

    Chang-wan Kim

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  1. Dong-Chan Lee
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  2. Seunghyeon Cho
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Correspondence to Chang-wan Kim.

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Recommended by Editor Seungjae Min

Dong-chan Lee received the B.S. and M.S. degrees in mechanical engineering from Konkuk University, Seoul, Republic of Korea, in 2014 and 2016, respectively. He is currently working toward the Ph.D. degree in mechanical design engineering at Hanyang University, Seoul, Republic of Korea. His research interests are multi-physics analysis and optimal design by CAE technology.

Chang-Wan Kim received the B.S. degree in mechanical engineering, Hanyang University, Republic of Korea, in 1987. He received the M.S. degree in mechanical engineering from Pohang University of Science and Technology (POSTECH), Republic of Korea, in 1993. He received the M.S. degree in computational applied mathematics, and Ph.D. degree in aerospace and engineering mechanics from University of Texas at Austin, Texas, USA, in 1997 and 1999, respectively. He is currently a Professor of Department of Mechanical Engineering, Konkuk University, Seoul, Korea. His research interests include vibration and noise analysis, multi-body dynamics, optimal design, and multi-physics analysis.

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Lee, DC., Cho, S., Yang, Hi. et al. Load analysis and structural strength evaluation of semi-submersible platform for wind turbines in Jeju Island sea states using hydrodynamic-structure interaction analysis. J Mech Sci Technol 34, 1227–1235 (2020). https://doi.org/10.1007/s12206-020-0221-5

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  • DOI: https://doi.org/10.1007/s12206-020-0221-5

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