预览加载中，请您耐心等待几秒...

基于频响函数扩展修正的Benchmark结构损伤识别.docx

预览
1/3
2/3
3/3

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

基于频响函数扩展修正的Benchmark结构损伤识别 Abstract Thispaperpresentsamethodfordamageidentificationinbenchmarkstructuresusingtheextendedandmodifiedfrequencyresponsefunction(FRF).Damageidentificationisacrucialaspectofstructuralhealthmonitoring,whichaimstoassessthestructuralintegrityandpreventcatastrophicfailures.TheproposedmethodtakesadvantageofthepassivenatureoftheFRFmeasurementandissuitableforonlinemonitoring.Themethodisvalidatedusingnumericalsimulationsonabenchmarkstructure,andtheresultsshowthattheproposedmethodiscapableofaccuratelydetectingandlocalizingdamage. Introduction Structuralhealthmonitoring(SHM)isanemergingfieldthataimstoassessthestructuralintegrityofengineeringstructuresandpreventcatastrophicfailures.DamageidentificationisacrucialaspectofSHM,whichaimstodetectandlocatedamageinthestructureatanearlystage.Hence,itisessentialtodeveloprobustandreliablemethodsfordamageidentification. Oneofthemostwidelyusedmethodsfordamageidentificationisthefrequencyresponsefunction(FRF)method.TheFRFisapassivemeasurementmethodthatmeasurestheresponseofastructuretoaninputexcitation.TheFRFiswidelyusedinSHMduetoitssimplicity,lowcost,andnon-intrusivenature.However,theFRFmethodisoftenlimitedbytheneedforabaselinemodel,i.e.,anundamagedmodel,andthesensitivityofthemethodtomeasurementnoiseandmodelingerrors. Toovercometheselimitations,thispaperproposesamethodfordamageidentificationinbenchmarkstructuresusingtheextendedandmodifiedFRF.TheproposedmethodextendstheconventionalFRFmethodbyincorporatinghigher-ordertermsintheFRF,andmodifiestheFRFtoreducetheimpactofmodelingerrorsandmeasurementnoise.Theproposedmethodisvalidatedusingnumericalsimulationsonabenchmarkstructure,andtheresultsshowthattheproposedmethodiscapableofaccuratelydetectingandlocalizingdamage. Background TheFRFmethodisbasedonthemeasurementofthefrequencyresponseofastructuretoaninputexcitation.TheFRFisdefinedastheratiooftheoutputresponsespectrumtotheinputexcitationspectrum.TheFRFisatransferfunctionthatdescribesthestructuralresponsetoaninputexcitationat