Dynamic Response Analysis and Positioning Performance Evaluation of an Arctic Floating Platform Based on the Mooring-Assisted Dynamic Positioning System
Abstract
:1. Introduction
2. Theoretical Method
2.1. Calculation Method of Wave Load
- —Velocity potential of the incident wave
- —Radiation velocity potential
- —Diffraction velocity potential
- t—Time
- —Coordinate of any point in the flow field
- A—Wave amplitude
- k—Wave number
- —Wave direction angle
- z—Coordinate of water quality point
- H—Water depth
- —Wave frequency
- —Gravitational acceleration
2.2. Calculation Method of Ice Load
2.2.1. Finite Element Method Based on Fluid-Structure Interaction
2.2.2. Discrete Element Method
- —Normal force between particles
- —Normal moment between particles
- —Tangential force between particles
- —Tangential moment between particles
- —Radius of the bonding disk
- —Cross-sectional area of the bonding disk
- —Moment of inertia of the bonding disk
- —Polar moment of inertia of the bonding disk
- —Normal bonding strength
- —Tangential bonding strength
2.3. Method for Load Analysis of Mooring Systems
- —External force per unit length
- —Mass per unit length
- —Moment applied per unit length
2.4. The Control Method of the Dynamic Positioning System
3. Numerical Model and Validation
3.1. Model Information and Operating Condition Introduction
3.2. Hydrodynamic Performance Prediction and Mesh Convergence Verification
3.3. Comparison of Ice Load Simulation Methods
4. Analysis of the Results
4.1. Mooring Lines Tension under Different Positioning Modes
4.2. Platform Motion under Different Positioning Modes
4.2.1. Surge, Sway and Yaw Motion of the Platform under Different Environmental Loads
4.2.2. Motion Trajectories of the Platform under Different Positioning Modes
5. Conclusions
- Compared with the mooring system, the mooring-assisted dynamic positioning system can effectively reduce the tension of the mooring lines, but the effect is not significant enough under the condition of level ice. In the composite positioning system, the mooring system plays a greater role than the dynamic positioning system, which is the main part of providing the recovery force for the platform. Under the same mooring arrangement, the change in the number and position of thrusters will not have a significant impact on the average tension of the mooring system.
- Compared with a mooring system, a mooring-assisted dynamic positioning system can reduce platform deviation. The influence of a dynamic positioning system on sway and yaw motion under different environmental loads should be considered comprehensively in the design. Mooring lines or thrusters should be arranged in the main direction of the platform structure to avoid excessive surge motion. In the design scheme of this paper, eight thrusters and four thrusters (Pattern 2) have a better positioning effect on the platform. The arrangement of thrusters in the direction of the non-mooring system is more conducive to the stability of the platform.
- Compared with wave condition, ice condition has a higher correlation with different positioning methods. Ice loads can lead to greater differences in platform motion responses. The tension of the mooring system changes more considerably under level ice. The maximum surge, sway and yaw motion of the platform under different design schemes also fluctuate the most in level ice condition. From the time-domain analysis, it can be observed that the period and amplitude of the platform’s reciprocating motion under the broken ice floes are more obvious than that under the wave loads.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameters | Values |
---|---|
Significant wave height (m) | 3.7 |
Spectral peak period (s) | 6.7 |
Thickness of the level ice (m) | 1.8 |
Ice speed (m/s) | 0.1 |
Thickness of the broken ice floes (m) | 1.8 |
Average size of the ice floes (m2) | 50 |
Concentration of the broken ice floes area (%) | 80 |
Current speed (m/s) | 0.4 |
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Gu, Y.; Chuang, Z.; Zhang, A.; Hu, A.; Ji, S. Dynamic Response Analysis and Positioning Performance Evaluation of an Arctic Floating Platform Based on the Mooring-Assisted Dynamic Positioning System. J. Mar. Sci. Eng. 2023, 11, 486. https://doi.org/10.3390/jmse11030486
Gu Y, Chuang Z, Zhang A, Hu A, Ji S. Dynamic Response Analysis and Positioning Performance Evaluation of an Arctic Floating Platform Based on the Mooring-Assisted Dynamic Positioning System. Journal of Marine Science and Engineering. 2023; 11(3):486. https://doi.org/10.3390/jmse11030486
Chicago/Turabian StyleGu, Yingbin, Zhenju Chuang, Aobo Zhang, Ankang Hu, and Shunying Ji. 2023. "Dynamic Response Analysis and Positioning Performance Evaluation of an Arctic Floating Platform Based on the Mooring-Assisted Dynamic Positioning System" Journal of Marine Science and Engineering 11, no. 3: 486. https://doi.org/10.3390/jmse11030486
APA StyleGu, Y., Chuang, Z., Zhang, A., Hu, A., & Ji, S. (2023). Dynamic Response Analysis and Positioning Performance Evaluation of an Arctic Floating Platform Based on the Mooring-Assisted Dynamic Positioning System. Journal of Marine Science and Engineering, 11(3), 486. https://doi.org/10.3390/jmse11030486