Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines
Results in Engineering, cilt.27, sa.105631, ss.1-15, 2025 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 27 Sayı: 105631
- Basım Tarihi: 2025
- Doi Numarası: 10.1016/j.rineng.2025.105631
- Dergi Adı: Results in Engineering
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
- Sayfa Sayıları: ss.1-15
- Gazi Üniversitesi Adresli: Evet
Özet
Recent technological advancements have made marine energy a significant focus within renewable energy.
Offshore wind turbines are usually installed on monopile foundations up to a certain depth. When these
monopiles also support hydrokinetic turbines, they form combined hybrid systems. Natural frequency analysis is
one of the most critical design criteria for these systems. Traditionally, offshore wind turbines have been
analyzed using single-degree-of-freedom (SDOF) models. However, incorporating hydrokinetic turbines increases
the system’s complexity, requiring a multi-degree-of-freedom (MDOF) approach. This study performs a natural
frequency analysis based on a two-degree-of-freedom model for such hybrid systems. Compared with a previous
study, the analytical solution shows a difference of only 2.35 %, indicating strong consistency with the literature.
Moreover, a 24.59 % decrease in the system’s natural frequency is observed compared to the wind-only
configuration, emphasizing the need for higher-order modeling in hybrid systems.