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    Analysis of High-Frequency Vibration of Tension Leg Platforms

    Source: Journal of Offshore Mechanics and Arctic Engineering:;1987:;volume( 109 ):;issue: 002::page 119
    Author:
    R. P. Nordgren
    DOI: 10.1115/1.3256999
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The dynamic response of a tension leg platform is studied using spectral analysis techniques. Equations of motion are derived for the rigid platform and its legs which are idealized as cables with longitudinal inertia. Attention is focused on the high-frequency resonant response of the platform in heave, pitch and roll modes with typical periods of 3 to 5 s. These modes are lightly damped, but the wave excitation at the high natural frequencies is small. Thus the response may turn out to be small. Formulas are derived for expected fatigue damage in the tethers due to high-frequency resonant vibration. The analysis includes linear damping from wave radiation and from energy dissipation in the tethers. By way of example, the results of the analysis are applied to a typical tension leg platform for petroleum production in 640 m (2100 ft) of water. The fatigue life for resonant vibration is found to be adequate.
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      Analysis of High-Frequency Vibration of Tension Leg Platforms

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    http://yetl.yabesh.ir/yetl1/handle/yetl/102826
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    • Journal of Offshore Mechanics and Arctic Engineering

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    contributor authorR. P. Nordgren
    date accessioned2017-05-08T23:25:25Z
    date available2017-05-08T23:25:25Z
    date copyrightMay, 1987
    date issued1987
    identifier issn0892-7219
    identifier otherJMOEEX-28041#119_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/102826
    description abstractThe dynamic response of a tension leg platform is studied using spectral analysis techniques. Equations of motion are derived for the rigid platform and its legs which are idealized as cables with longitudinal inertia. Attention is focused on the high-frequency resonant response of the platform in heave, pitch and roll modes with typical periods of 3 to 5 s. These modes are lightly damped, but the wave excitation at the high natural frequencies is small. Thus the response may turn out to be small. Formulas are derived for expected fatigue damage in the tethers due to high-frequency resonant vibration. The analysis includes linear damping from wave radiation and from energy dissipation in the tethers. By way of example, the results of the analysis are applied to a typical tension leg platform for petroleum production in 640 m (2100 ft) of water. The fatigue life for resonant vibration is found to be adequate.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAnalysis of High-Frequency Vibration of Tension Leg Platforms
    typeJournal Paper
    journal volume109
    journal issue2
    journal titleJournal of Offshore Mechanics and Arctic Engineering
    identifier doi10.1115/1.3256999
    journal fristpage119
    journal lastpage125
    identifier eissn1528-896X
    treeJournal of Offshore Mechanics and Arctic Engineering:;1987:;volume( 109 ):;issue: 002
    contenttypeFulltext
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