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Deterministic Fatigue Damage Evaluation of Semi-submersible Platform for Wind Turbines Using Hydrodynamic-Structure Interaction Analysis

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Abstract

Wind farms are typically constructed in offshore areas using floating structures. However, such structures are difficult to maintain, sufficient fatigue life must be ensured during the design process. Therefore, techniques for determining the fatigue load on a floating structure in a marine environment and predicting its lifespan are required. This paper proposes a deterministic fatigue damage analysis method of semi-submersible platform for wind turbines using a hydrodynamic-structure interaction analysis. The process for calculating the fatigue load cycle consists of generating the waves in the time series using the JONSWAP spectrum from probabilistic wave scatter diagrams and decomposes them repeatedly into a number of individual regular waves. This process can simplify calculation of the fatigue load cycle by converting irregular dynamic wave load into a combination of static wave loads. The stress range for fatigue analysis is calculated through hydrodynamic structure interaction analysis. The stress ranges are applied to the S–N curves specified in the DNV-RP-C203 and cumulative fatigue damage is predicted using Miner’s rule. To detailed describe the proposed method, fatigue damage analysis was performed on the DeepCwind semi-submersible developed by the National Renewable Energy Laboratory based on the state of the western sea of Jeju Island, South Korea.

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Abbreviations

\(H_{s}\) :

Significant height

\(T_{p}\) :

Peak period

\(g\) :

Gravitational acceleration

\(\omega_{p}\) :

The peak frequency in rad/s

\(\gamma\) :

The peak enhancement factor

\(\alpha\) :

Constant that relates to the wind speed and the peak frequency of the wave spectrum

\(N\) :

The number of harmonics

\(\omega_{n}\) :

The nth angular frequency

\(a_{n}\) :

The nth amplitude

\(\phi_{n}\) :

The nth uniformly distributed phase angle [0,\(2\pi\)]

\(\Delta \omega\) :

The angular frequency interval

\(\Delta \sigma_{m,hotspot}\) :

Membrane stress

\(\Delta \sigma_{b,hotspot}\) :

Bending stress

\(N_{L\_i}\) :

iTh fatigue loading cycle

\(N_{A\_i}\) :

iTh fatigue allowable cycle

r:

Radius of the tubular member

t:

Thickness of the tubular member

D:

Cumulative fatigue damage

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2019R1A2C1090228) and the Technology Innovation Program (20012518) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. School of Mechanical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Republic of Korea

    Dong-Chan Lee & Chang-wan Kim

  2. POSCO Technical Research Laboratories, Process Engineering Research Lab, Donghaean-ro, Nam-gu, Pohang-si, 37859, Republic of Korea

    Sang-kwon Na

  3. Korea Testing Laboratory, Renewable Energy Technology Center, Haean-ro, Sangnok-gu, Ansan-si, 15588, Republic of Korea

    Seongwon Kim

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Correspondence to Chang-wan Kim.

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Lee, DC., Na, Sk., Kim, S. et al. Deterministic Fatigue Damage Evaluation of Semi-submersible Platform for Wind Turbines Using Hydrodynamic-Structure Interaction Analysis. Int. J. of Precis. Eng. and Manuf.-Green Tech. 9, 1317–1328 (2022). https://doi.org/10.1007/s40684-021-00326-7

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