Effect of mooring line configurations on the dynamic responses of truss spar platforms

Montasir, O.A.; Yenduri, Anurag; Kurian, V.J.

doi:10.1016/j.oceaneng.2014.11.027

Cited by 32 publications

(11 citation statements)

References 6 publications

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“…In this study, the structural damping has been considered, while the damping that comes from the mooring lines is assumed to be negligible. Incecik [28] used strip theory to calculate the damping matrix while in this paper the aforementioned has been conducted, based on [8], [9], [29]- [31], as shown in the following equation:…”

Section: ) Added Mass Matrixmentioning

confidence: 99%

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Dynamic Analysis of a Tension Leg Platforms (TLPs) Inspired by Parallel Robotic Manipulators

Horoub

2020

IEEE Access

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Dynamic performance of a tension leg platform (TLP) is analyzed using a robotic manipulator approach. The TLP is vertically anchored to the seabed by twelve mooring lines. A triangular mooring line configuration is studied. In order to provide necessary motion compensation to impinging water wave loads, necessary mooring line tensioning is accomplished by means of motors with reels mounted on the TLP which keep all mooring lines taut. Manipulator-based mass, damping stiffness matrices are calculated for the TLP. The forces due to the impinging water waves are estimated based on integral methods. The dynamic response is studied within the context of a rigid-body framework. The effect of increasing/decreasing the mooring line stiffness and pre-tensions on the dynamic behavior of the TLP are investigated.

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Section: ) Added Mass Matrixmentioning

confidence: 99%

“…The added stiffness matrix is known as the hydrostatic stiffness matrix, and it depends on the fluid domain around the platform structure. In this paper, the aforementioned has been conducted, based on [26], [29], [31], as shown in the following equation.…”

Section: ) Added Stiffness Matrixmentioning

confidence: 99%

Dynamic Analysis of a Tension Leg Platforms (TLPs) Inspired by Parallel Robotic Manipulators

Horoub

2020

IEEE Access

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“…In the simulation, three-dimensional dynamics of the mooring chain and the interaction with the tethered moving object are calculated. Interactions between the tethered moving objects and the mooring chains are implemented by data exchange: the mooring chain model supplies tension forces on the moving objects, and the moving objects provide instantaneous locations of the tether points of the mooring chains [28], [29]. A finite segment approach is employed to calculate mooring motion and force.…”

Section: Cylinder Motion and Wavementioning

confidence: 99%

Numerical Study on the Hydrodynamic Characteristics and Responses of Moored Floating Marine Cylinders Under Real-World Tsunami-Like Waves

et al. 2019

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In recent tsunami events like those happened in the Indian Ocean in 2004 and 2018 and in Japan in 2011, many ocean and coastal infrastructures have been damaged tremendously, revealing the need of the work to study the hydrodynamic interaction between real-world tsunami waves and offshore structures. Besides, the destructive energy of tsunami wave on the offshore structures should also be assessed. However, to study the impact of tsunami waves on offshore structures, solitary waves are used generally instead of real-world tsunami waves despite the vast differences in hydrodynamic characteristics. Using Computational Fluid Dynamics (CFD) approach, this paper investigates the hydrodynamic characteristics of the floating cylinders moored by chains, under the real-world tsunami-like waves (2011 Japan Tohoku tsunami). Comparisons of hydrodynamic characteristics between real-world tsunami-like wave and solitary wave propagating over the moored cylinders are analyzed and discussed, indicating that the flow fields, the tension forces of mooring chains, the impinging forces and the movement trajectories of the cylinder caused by the two types of waves are greatly different from each other. Moreover, the influences of single cylinder diameter and tandem cylinder spacing on the interaction between real-world tsunami-like waves and cylinders are considered through a series of simulation tests, while meaningful conclusions are drawn. INDEX TERMS Hydrodynamic characteristics, moored cylinder, real-world tsunami-like wave, solitary wave, hydrodynamic forces.

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“…They also optimized the geometric parameters that can produce better power absorption. Montasir et al [9] investigated the effect of symmetric and asymmetric mooring configurations on the quasi-static response of truss spar platforms based on the approach suggested by Agarwal and Jain [7]. The Mooring Analysis Program (MAP) was developed by the National Renewable Energy Laboratory (NREL) based on solving the Catenary equation iteratively [10].…”

Section: Introductionmentioning

confidence: 99%

The Quasi-Static Response of Moored Floating Structures Based on Minimization of Mechanical Energy

Chen

Choung

2021

JMSE

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It is essential to design a reasonable mooring line length that ensures quasi-static responses of moored floating structures are within an acceptable level, and that reduces the cost of mooring lines in the overall project. Quasi-static responses include the equilibrium position and the line tension of a moored floating structure (also called the mean value in a dynamic response), etc. The quasi-static responses derived by the classic catenary equation cannot present mooring–seabed interaction and hydrodynamic effects on a mooring line. While a commercial program can predict reasonable quasi-static responses, costly modeling is required. This motivated us to propose a new method for predicting quasi-static responses that minimizes the mechanical energy of the whole system based on basic geometric parameters, and that is easy to implement. In this study, the mechanical energy of moored floating structures is assumed to be the sum of gravitational–buoyancy potential energy, kinetic energy induced by drag forces, and spring potential energy derived by line tension. We introduce fundamental theoretical background for the development of the proposed method. We investigate the effect of quasi-static actions on mooring response, comparing the proposed method’s results with those from the catenary equation and ABAQUS software. The study reveals the shortcomings of the catenary equation in offshore applications. We also compare quasi-static responses derived by the AQWA numerical package with the results calculated from the proposed method for an 8 MW WindFloat 2 type of platform. Good agreement was drawn between the proposed method and AQWA. The proposed method proves more timesaving than AQWA in terms of modeling of mooring lines and floaters, and more accurate than the catenary equation, and can be used effectively in the early design phase of dimension mooring lengths for moored floating structures.

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Effect of mooring line configurations on the dynamic responses of truss spar platforms

Cited by 32 publications

References 6 publications

Dynamic Analysis of a Tension Leg Platforms (TLPs) Inspired by Parallel Robotic Manipulators

Dynamic Analysis of a Tension Leg Platforms (TLPs) Inspired by Parallel Robotic Manipulators

Numerical Study on the Hydrodynamic Characteristics and Responses of Moored Floating Marine Cylinders Under Real-World Tsunami-Like Waves

The Quasi-Static Response of Moored Floating Structures Based on Minimization of Mechanical Energy

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