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    Stability-Based Design of Two-Point Mooring Systems With Hydrodynamic Memory

    Source: Journal of Offshore Mechanics and Arctic Engineering:;1997:;volume( 119 ):;issue: 001::page 61
    Author:
    J.-S. Chung
    DOI: 10.1115/1.2829047
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A systematic method of determining the design parameter values of two-point mooring (TPM) systems is presented. The conclusions of nonlinear stability analysis of horizontal plane slow motion dynamics of TPM systems with hydrodynamic memory are used to guide selection of the design variables. Specifically, within the stable regions of bifurcation diagram, a set of parameter values is chosen systematically to examine the corresponding TPM system. Then, each TPM system is simulated and the results are evaluated in terms of given criteria such as tension level of the mooring line or offset of the moored vessel. The hydrodynamic memory effect due to the oscillatory motions of moored vessel is included in the formulation. The memory effect influences the stability properties of TPM systems and alters the design chart/bifurcation diagram and particularly the static loss and dynamic loss of stability. The significance of hydrodynamic memory on several TPM systems is illustrated by comparing the statistics of the simulations. The design approach implemented in this work shows that nonlinear stability theory can be used effectively in the actual design process of mooring systems to reduce dramatically the number of simulations required. It is also shown that the often inconclusive nonlinear time simulations can be guided by theoretical nonlinear stability analysis of system dynamics to produce improved design values of system parameters of TPM systems.
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      Stability-Based Design of Two-Point Mooring Systems With Hydrodynamic Memory

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    http://yetl.yabesh.ir/yetl1/handle/yetl/119219
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    • Journal of Offshore Mechanics and Arctic Engineering

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    contributor authorJ.-S. Chung
    date accessioned2017-05-08T23:54:26Z
    date available2017-05-08T23:54:26Z
    date copyrightFebruary, 1997
    date issued1997
    identifier issn0892-7219
    identifier otherJMOEEX-28115#61_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/119219
    description abstractA systematic method of determining the design parameter values of two-point mooring (TPM) systems is presented. The conclusions of nonlinear stability analysis of horizontal plane slow motion dynamics of TPM systems with hydrodynamic memory are used to guide selection of the design variables. Specifically, within the stable regions of bifurcation diagram, a set of parameter values is chosen systematically to examine the corresponding TPM system. Then, each TPM system is simulated and the results are evaluated in terms of given criteria such as tension level of the mooring line or offset of the moored vessel. The hydrodynamic memory effect due to the oscillatory motions of moored vessel is included in the formulation. The memory effect influences the stability properties of TPM systems and alters the design chart/bifurcation diagram and particularly the static loss and dynamic loss of stability. The significance of hydrodynamic memory on several TPM systems is illustrated by comparing the statistics of the simulations. The design approach implemented in this work shows that nonlinear stability theory can be used effectively in the actual design process of mooring systems to reduce dramatically the number of simulations required. It is also shown that the often inconclusive nonlinear time simulations can be guided by theoretical nonlinear stability analysis of system dynamics to produce improved design values of system parameters of TPM systems.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleStability-Based Design of Two-Point Mooring Systems With Hydrodynamic Memory
    typeJournal Paper
    journal volume119
    journal issue1
    journal titleJournal of Offshore Mechanics and Arctic Engineering
    identifier doi10.1115/1.2829047
    journal fristpage61
    journal lastpage69
    identifier eissn1528-896X
    treeJournal of Offshore Mechanics and Arctic Engineering:;1997:;volume( 119 ):;issue: 001
    contenttypeFulltext
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