On the dynamics of a multicomponent mooring line

Khan, Najeeb Ullah; Ansari, Khyruddin Akbar

doi:10.1016/0045-7949(86)90037-4

Cited by 27 publications

(7 citation statements)

References 2 publications

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“…In this approach, illustrated in Figure 1 The model calculates the hydrodynamic loads directly at the node points rather than the more common approach of calculating the hydrodynamic forces at the segment midpoints and then distributing them to the node points (eg. Walton and Polachek, 1959;Khan and Ansari, 1986 Figure 2).…”

Section: Lumped-mass Mooring Line Modelmentioning

confidence: 99%

“…The model provided convincing though unvalidated results showing that dynamics matter to the mooring loads. Khan and Ansari (1986) developed a lumped-mass approach in three dimensions. As in the previous case, the cable segments are assumed rigid and massless and subject to hydrodynamic forces, while the masses are concentrated at the node points.…”

Section: Introductionmentioning

confidence: 99%

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Validation of a lumped-mass mooring line model with DeepCwind semisubmersible model test data

2015

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Section: Lumped-mass Mooring Line Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of a lumped-mass mooring line model with DeepCwind semisubmersible model test data

2015

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“…A longline aquaculture system is essentially an underwater system of interconnected lines of various materials. The dynamics of such a system can be studied with different methods: Finite-difference [11,12], lumped-mass [13][14][15][16] and the inclusion of bending and torsion on cable segments by finite elements analysis (FEA) [17][18][19]. In lumped-mass approach, the governing equations are discretized in space, whereas it is discretized in space and time in finite-difference models [15].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Pribadi¹,

Donatini²,

Lataire³

2019

JMSE

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This paper describes a numerical model to simulate the behavior of a mussel longline system, subjected to environmental loads such as waves and current. The mussel line system consists of an anchor, a mooring chain, a long backbone line, mussel collector lines and buoys. The lumped-mass open-source code MoorDyn is modified for the current application. Waves are modelled as a directional spectrum, and the current as a homogeneous velocity field with an exponential vertical distribution. A Coulomb model is implemented to model the horizontal friction between nodes and the seabed. Cylindrical buoys with three translational degrees-of-freedom are modelled by extending the simplified hydrodynamic model in use for line’s internal nodes with additional properties like cylinder height, diameter and mass. Clump weights are modelled in a similar way. For validation purposes, the results of the present software are compared with the commercially available lumped-mass based mooring dynamic software, OrcaFlex.

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“…The solution to Equation 5is commonly found using a finite element (FE) method where the mooring lines are discretized into several elements, and it is possible to advance in time and space by using a range of different methods with different orders of accuracy [15]. An approximation commonly used in mooring analysis tools is the lumped mass approach [16][17][18][19][20]. This can denote that the FE mass matrix is approximated with a lumped mass matrix where the properties of each element are redistributed to the elemental nodes, which results in a diagonal mass matrix and, therefore, eases the calculations and reduces the simulation time.…”

Section: Dynamic Modeling Of Floating Wecs With Mooringsmentioning

confidence: 99%

Screening of Available Tools for Dynamic Mooring Analysis of Wave Energy Converters

2017

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The focus on alternative energy sources has increased significantly throughout the last few decades, leading to a considerable development in the wave energy sector. In spite of this, the sector cannot yet be considered commercialized, and many challenges still exist, in which mooring of floating wave energy converters is included. Different methods for assessment and design of mooring systems have been described by now, covering simple quasi-static analysis and more advanced and sophisticated dynamic analysis. Design standards for mooring systems already exist, and new ones are being developed specifically forwave energy converter moorings, which results in other requirements to the chosen tools, since these often have been aimed at other offshore sectors. The present analysis assesses a number of relevant commercial software packages for full dynamic mooring analysis in order to highlight the advantages and drawbacks. The focus of the assessment is to ensure that the software packages are capable of fulfilling the requirements of modeling, as defined in design standards and thereby ensuring that the analysis can be used to get a certified mooring system. Based on the initial assessment, the two software packages DeepC and OrcaFlex are found to best suit the requirements. They are therefore used in a case study in order to evaluate motion and mooring load response, and the results are compared in order to provide guidelines for which software package to choose. In the present study, the OrcaFlex code was found to satisfy all requirements.

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On the dynamics of a multicomponent mooring line

Cited by 27 publications

References 2 publications

Validation of a lumped-mass mooring line model with DeepCwind semisubmersible model test data

Validation of a lumped-mass mooring line model with DeepCwind semisubmersible model test data

Numerical Modelling of a Mussel Line System by Means of Lumped-Mass Approach

Screening of Available Tools for Dynamic Mooring Analysis of Wave Energy Converters

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