简介:Ananalyticalstudyofthetwodegreesoffreedomnonlineardynamicalsystemispresented.Theinternalmotionofthesystemisseparatedanddescribedbyonefourthorderdifferentialequation.AnapproximateapproachallowsreducingtheproblemtotheDuffingequationwithadequateinitialconditions.Anovelideaforaneffectivestudyofnonlineardynamicalsystemsconsistinginaconceptofthesocalledlimitingphasetrajectoriesisapplied.Bothqualitativeandquantitativecomplexanalyseshavebeenperformed.Importantnonlineardynamicaltransitiontypephenomenaaredetectedanddiscussed.Inparticular,nonsteadyforcedsystemvibrationsareinvestigatedanalytically.
简介:ThispaperpresentsacanonicalHamiltonianmodelofliquidsloshingforthecontainercoupledwithspacecraft.Ellipticalshapeofrigidbodyisconsideredasspacecraftstructure.Hamiltoniansystemisanimportantformofmechanicalsystem.Itmostlyusedtostabilizethepotentialshapingofdynamicalsystem.Freesurfacemovementofliquidinsidethecontaineriscalledsloshing.Ifthereisuncontrolledresonancebetweenthemotionoftankandliquid-frequencyinsidethetankthensuchsloshingcanbeareasonofattitudedisturbanceorstructuraldamageofspacecraft.Equivalentmechanicalmodelofsimplependulumormassattachedwithspringforsloshingisusedbymanyresearchers.MassattachedwithspringisusedasanequivalentmodelofsloshingtoderivethemathematicalequationsintermsofHamiltonianmodel.AnalyticalmethodofLyapunovfunctionwithCasimirenergyfunctionisusedtofindthestabilityforspacecraftdynamics.Verticalaxialrotationistakenasthemajoraxialsteadyrotationforthemovingrigidbody.