Dynamic Response and Mooring Fracture Performance Analysis of a Semi-Submersible Floating Offshore Wind Turbine under Freak Waves
Abstract
:1. Introduction
2. Physical Problem
3. Methodology
3.1. Dynamic Model of the FOWT
3.1.1. Three-Dimensional Potential Theory
3.1.2. Blade Element Momentum Theory
3.1.3. Governing Equation of the Buoy
3.1.4. Dynamic Modeling of Flexible Structures
3.2. Numerical Algorithm of the Freak Wave Generation
4. Validation
5. Results
5.1. Dynamic Responses under Freak Waves
5.2. Dynamic Responses under Mooring Line Fracture
5.2.1. Floater Motion
5.2.2. Blade Deformation
5.2.3. Tower Bending Moment
5.2.4. Mooring Lines
5.2.5. Aerodynamic Performance
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Value |
---|---|
Total length | 71.96 m |
Total width | 80.0 m |
Depth | 33.0 m |
Column diameter/spacing | 13.0 m/60.0 m |
Pontoon width/height | 14.0 m/3.5 m |
Diameter/height of droop plate | 20.0 m/3.5 m |
Square cross brace length/width/height | 47 m/3.5 m/3.5 m |
Working condition draft | 18 m |
Weight | 5621.066 t |
Center of gravity | (29.314 m, 0.309 m, 24.793 m) |
Parameters | Value |
---|---|
Rated power | 5 MW |
Wind direction | Leeward |
Number of blades | 3 |
Shafting transmission efficiency | 0.944 |
Wind wheel radius | 63 m |
Propeller hub radius | 1.5 m |
Cut-in/rated/cut-out wind speed | 3 m/s, 11.4 m/s, 25 m/s |
Rated speed | 12.1 rpm |
Hub height | 90 m |
Height of center of gravity | 64.0 m |
Mooring Line Segmentation | Bottom Part | Middle Part | Top Part |
---|---|---|---|
Ingredients | M2 | R3 | R3S |
Diameter (mm) | 208 | 122 | 122 |
Length (m) | 280 | 131 | 20 |
Dry weight (kg/m) | 861 | 296.2 | 296.2 |
Breaking tension (kN) | 24,140 | 11,365 | 12,690 |
Axial stiffness (kN) | 3,690,000 | 1,270,000 | 1,270,000 |
Parameters | Value |
---|---|
Spectral peak period | 10 s |
Significant wave height | 3 m |
Frequency-domain range | 0.05~2 rad/s |
Number of constituent waves | 1000 |
Number of random waves | 600 |
Simulation duration | 1600 s |
Time interval | 0.1 s |
Focus moment | 800 s |
Focus location | 0 m |
DOF | Our Work | Zhao et al. [29] | Relative Error |
---|---|---|---|
Natural Period | Natural Period | ||
Surge | 52.86 s | 59.48 s | 11.13% |
Sway | 53.57 s | 58.66 s | 8.68% |
Heave | 24.25 s | 24.12 s | 0.05% |
Pitch | 23.25 s | 23.12 s | 0.06% |
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Liu, B.; Yu, J. Dynamic Response and Mooring Fracture Performance Analysis of a Semi-Submersible Floating Offshore Wind Turbine under Freak Waves. J. Mar. Sci. Eng. 2024, 12, 1414. https://doi.org/10.3390/jmse12081414
Liu B, Yu J. Dynamic Response and Mooring Fracture Performance Analysis of a Semi-Submersible Floating Offshore Wind Turbine under Freak Waves. Journal of Marine Science and Engineering. 2024; 12(8):1414. https://doi.org/10.3390/jmse12081414
Chicago/Turabian StyleLiu, Baolong, and Jianxing Yu. 2024. "Dynamic Response and Mooring Fracture Performance Analysis of a Semi-Submersible Floating Offshore Wind Turbine under Freak Waves" Journal of Marine Science and Engineering 12, no. 8: 1414. https://doi.org/10.3390/jmse12081414