Analysis of High-Frequency Vibration of Tension Leg PlatformsSource: Journal of Offshore Mechanics and Arctic Engineering:;1987:;volume( 109 ):;issue: 002::page 119Author:R. P. Nordgren
DOI: 10.1115/1.3256999Publisher: 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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contributor author | R. P. Nordgren | |
date accessioned | 2017-05-08T23:25:25Z | |
date available | 2017-05-08T23:25:25Z | |
date copyright | May, 1987 | |
date issued | 1987 | |
identifier issn | 0892-7219 | |
identifier other | JMOEEX-28041#119_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/102826 | |
description 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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Analysis of High-Frequency Vibration of Tension Leg Platforms | |
type | Journal Paper | |
journal volume | 109 | |
journal issue | 2 | |
journal title | Journal of Offshore Mechanics and Arctic Engineering | |
identifier doi | 10.1115/1.3256999 | |
journal fristpage | 119 | |
journal lastpage | 125 | |
identifier eissn | 1528-896X | |
tree | Journal of Offshore Mechanics and Arctic Engineering:;1987:;volume( 109 ):;issue: 002 | |
contenttype | Fulltext |