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http://dx.doi.org/10.7837/kosomes.2021.27.6.846

Modified Empirical Formula of Dynamic Amplification Factor for Wind Turbine Installation Vessel  

Ma, Kuk-Yeol (Department of Naval Architecture and Ocean Engineering, Pusan National University, Structure Basic and Detail Design, Structure Engineering Team, Samsung Heavy Industries)
Park, Joo-Shin (Noise and Vibration Research, Ship and Offshore Research Institutes, Samsung Heavy Industries)
Lee, Dong-Hun (Noise and Vibration Research, Ship and Offshore Research Institutes, Samsung Heavy Industries)
Seo, Jung-Kwan (Dep. of Naval Architecture and Ocean Engineering/Korea Ship and Offshore Research Institute, Pusan National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.27, no.6, 2021 , pp. 846-855 More about this Journal
Abstract
Eco-friendly and renewable energy sources are actively being researched in recent times, and of shore wind power generation requires advanced design technologies in terms of increasing the capacities of wind turbines and enlarging wind turbine installation vessels (WTIVs). The WTIV ensures that the hull is situated at a height that is not affected by waves. The most important part of the WTIV is the leg structure, which must respond dynamically according to the wave, current, and wind loads. In particular, the wave load is composed of irregular waves, and it is important to know the exact dynamic response. The dynamic response analysis uses a single degree of freedom (SDOF) method, which is a simplified approach, but it is limited owing to the consideration of random waves. Therefore, in industrial practice, the time-domain analysis of random waves is based on the multi degree of freedom (MDOF) method. Although the MDOF method provides high-precision results, its data convergence is sensitive and difficult to apply owing to design complexity. Therefore, a dynamic amplification factor (DAF) estimation formula is developed in this study to express the dynamic response characteristics of random waves through time-domain analysis based on different variables. It is confirmed that the calculation time can be shortened and accuracy enhanced compared to existing MDOF methods. The developed formula will be used in the initial design of WTIVs and similar structures.
Keywords
Wind Turbine Installation Vessel; Dynamic Response; Leg; Single-Multi Degree of Freedom; Dynamic Amplification Factor;
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