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contributor authorE. R. Jefferys
contributor authorM. H. Patel
date accessioned2017-05-08T23:13:02Z
date available2017-05-08T23:13:02Z
date copyrightSeptember, 1982
date issued1982
identifier issn0195-0738
identifier otherJERTD2-26387#217_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/95674
description abstractConventional analysis of tension leg platform structures yields natural frequencies which are well separated from wave excitation frequencies. However, the results presented here show that the tethers can have lateral resonant frequencies in the wave frequency range if the platform is deployed in deep water. Analysis which ignores the lateral tether dynamics gives reasonable estimates of platform motions but can seriously underestimate tether displacements. It is usually assumed that tether tension does not vary with time. However, the vertical waves forces, reacted by the tethers, cause the tension to change with time and this can cause a Mathieu type of instability in the platform sway motion. This phenomenon is investigated using a simple energy balance technique and it is shown that square law fluid damping places an upper bound on oscillation amplitude; it is found that platform sway motions due to Mathieu excitation remain acceptable even in large waves.
publisherThe American Society of Mechanical Engineers (ASME)
titleDynamic Analysis Models of Tension Leg Platforms
typeJournal Paper
journal volume104
journal issue3
journal titleJournal of Energy Resources Technology
identifier doi10.1115/1.3230406
journal fristpage217
journal lastpage223
identifier eissn1528-8994
keywordsDynamic analysis
keywordsTension-leg platforms
keywordsFrequency
keywordsMotion
keywordsWaves
keywordsTension
keywordsWater
keywordsDamping
keywordsEnergy budget (Physics)
keywordsOscillations
keywordsDynamics (Mechanics)
keywordsForce
keywordsWave frequency AND Fluids
treeJournal of Energy Resources Technology:;1982:;volume( 104 ):;issue: 003
contenttypeFulltext


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