NONLINEAR FLUID DAMPING IN STRUCTURE-WAKE OSCILLATORS IN MODELING VORTEX-INDUCED VIBRATIONS-中国Betway体育网页登陆

摘要 ANonlinearFluidDamping(NFD)intheformofthesquare-velocityisappliedintheresponseanalysisofVortex-InducedVibrations(VIV).Itsnonlinearhydrodynamiceffectsonthecoupledwakeandstructureoscillatorsareinvestigated.AcomparisonbetweenthecoupledsystemswiththelinearandnonlinearfluiddampingsandexperimentsshowsthattheNFDmodelcanwelldescriberesponsecharacteristics,suchastheamplificationofbodydisplacementatlock-inandfrequencylock-in,bothathighandlowmassratios.Particularly,thepredictedpeakamplitudeofthebodyintheGriffinplotisingoodagreementwithexperimentaldataandempiricalequation,indicatingthesignificanteffectoftheNFDonthestructuremotion.

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NONLINEAR FLUID DAMPING IN STRUCTURE-WAKE OSCILLATORS IN MODELING VORTEX-INDUCED VIBRATIONS

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