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    Gaussian Analysis of an Irregular Wave Impact on Deck

    Source: Journal of Offshore Mechanics and Arctic Engineering:;2010:;volume( 132 ):;issue: 004::page 41302
    Author:
    Ravikiran S. Kota
    ,
    Torgeir Moan
    DOI: 10.1115/1.4001436
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Level-crossing analysis of long-crested, Gaussian waves in space and time are studied in the context of wave loads on a fixed, horizontal deck-box above mean waterline. Vertical wave loads on decks due to insufficient airgap are a major concern for many in-service platforms. Reliable estimation of magnitude and duration of these loads is important in assessing structural and global response of an offshore platform. In the case of an irregular wave-impact on a flat deck of dimensions comparable to mean wavelength of the incident waves, both temporal and spatial variability of wave-kinematics need to be considered during the deck-wetting process. In the present study, we have used a multidimensional Gaussian formulation of incident wave-kinematics to derive a joint probability density function of deck-wetting (or exceedance) duration and its spatial extent. We have also derived a probability density function for initial slam force on deck. A numerical scheme for simulating wave-impact events on a two-dimensional deck is discussed, results from which are compared against corresponding analytical estimates. Vertical force on deck was estimated using the momentum method, which includes a von Kármán slamming model applied over the wetted-length determined from an undisturbed wave profile.
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      Gaussian Analysis of an Irregular Wave Impact on Deck

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/144572
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    • Journal of Offshore Mechanics and Arctic Engineering

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    contributor authorRavikiran S. Kota
    contributor authorTorgeir Moan
    date accessioned2017-05-09T00:40:19Z
    date available2017-05-09T00:40:19Z
    date copyrightNovember, 2010
    date issued2010
    identifier issn0892-7219
    identifier otherJMOEEX-28366#041302_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/144572
    description abstractLevel-crossing analysis of long-crested, Gaussian waves in space and time are studied in the context of wave loads on a fixed, horizontal deck-box above mean waterline. Vertical wave loads on decks due to insufficient airgap are a major concern for many in-service platforms. Reliable estimation of magnitude and duration of these loads is important in assessing structural and global response of an offshore platform. In the case of an irregular wave-impact on a flat deck of dimensions comparable to mean wavelength of the incident waves, both temporal and spatial variability of wave-kinematics need to be considered during the deck-wetting process. In the present study, we have used a multidimensional Gaussian formulation of incident wave-kinematics to derive a joint probability density function of deck-wetting (or exceedance) duration and its spatial extent. We have also derived a probability density function for initial slam force on deck. A numerical scheme for simulating wave-impact events on a two-dimensional deck is discussed, results from which are compared against corresponding analytical estimates. Vertical force on deck was estimated using the momentum method, which includes a von Kármán slamming model applied over the wetted-length determined from an undisturbed wave profile.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleGaussian Analysis of an Irregular Wave Impact on Deck
    typeJournal Paper
    journal volume132
    journal issue4
    journal titleJournal of Offshore Mechanics and Arctic Engineering
    identifier doi10.1115/1.4001436
    journal fristpage41302
    identifier eissn1528-896X
    treeJournal of Offshore Mechanics and Arctic Engineering:;2010:;volume( 132 ):;issue: 004
    contenttypeFulltext
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