Skip to main content

Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines

Journal Article

Title: Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines
Author:
Demir, A.; Balas, C.
Publication Date:
Journal:
Results in Engineering
Volume:
27
Pages:
105631
Publisher:
Elsevier
Affiliation:
Gazi University
Technology:
Current, Axial Flow Turbine
Collection Method:
Modeling
Engineering:
Hybrid Devices, Structural, Substructure
Language:
English

Document Access

Website:
External Link
Attachment:
Access File
Notice: This material may be protected by Copyright Law.

Citation

Demir, A.; Balas, C. (2025). Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines. Results in Engineering, 27, 105631.https://doi.org/10.1016/j.rineng.2025.105631
@article{Demir-2025-40673,
author = {Demir, A and Balas, C},
title = {Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines},
journal = {Results in Engineering},
year = {2025},
month = {sep},
publisher = {Elsevier},
volume = {27},
pages = {105631},
doi = {10.1016/j.rineng.2025.105631},
url = {https://www.sciencedirect.com/science/article/pii/S2590123025017013},
keywords = {Current, Axial Flow Turbine, Modeling, Hybrid Devices, Structural, Substructure},
}
Export Citation to BibTex
TY - JOUR
TI - Frequency response of multi-degree-of-freedom hybrid offshore systems integrating wind and hydrokinetic turbines
AU - Demir, A
AU - Balas, C
T2 - Results in Engineering
AB - 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.
DA - 2025/09//
PY - 2025
PB - Elsevier
VL - 27
SP - 105631
UR - https://www.sciencedirect.com/science/article/pii/S2590123025017013
DO - 10.1016/j.rineng.2025.105631
LA - English
KW - Current
KW - Axial Flow Turbine
KW - Modeling
KW - Hybrid Devices
KW - Structural
KW - Substructure
ER -
Export Citation to RIS

Abstract

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.