第2章简谐激励受迫振动理论的应用.doc

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1、§2-5简谐激励受迫振动理论的应用(测振原理)yxm§2-5简谐激励受迫振动理论的应用(隔振原理)cFF§2-4-5等效粘性阻尼(EquivalentViscousDamping)EnergyDissipatedbyDamping(阻尼对系统能量的耗散作用)Dampingispresentinallsystem(阻尼无处不在)internalmolecularfriction–结构阻尼Structuraldampingslidingfriction–库仑阻尼Coulombdampingfluidresis

2、tance–粘性阻尼ViscousdampingSincemathematicaldescriptionofdampingisquitecomplicate,simplifieddampingmodalsuchasviscoushasbeendevelopedtoevaluatethesystemresponse.等效阻尼(Equivalentdamping)Ceq:equatetheenergydissipatedbytheviscousdampingtothatofthenonviscousdampi

3、ngforcewithassumedharmonicmotiontheamplitudeofsystematresonant结构阻尼(StructuralDamping)Fromexperimentsofmoststructuralmetals,dampingisindependentofthefrequencyandproportionaltothesquareoftheamplitudeComparetoviscousdampingatresonance0H(g)-yx