動力系統(tǒng)模型定階及溫度對于模態(tài)參數(shù)的影響研究.pdf

1、湖南大學碩士學位論文動力系統(tǒng)模型定階及溫度對于模態(tài)參數(shù)的影響研究姓名：劉翔申請學位級別：碩士專業(yè)：結(jié)構工程指導教師：易偉建20080505碩士學位論文AbstraCtAsdevelopingoftheoryandapplicationondamageidentificationbasedondynamicstheory；theresearchondamageidentificationisgoingdeepdayafterday；but

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3、medomainmethod’sadvantagesthat行equencydomainmethodhaven’t，theidentificationtheorybasedontimedomainhasbecometheemphasisinrecentresearchSomenewtheories’appearingsuchastheERA、SIMandSSIgiVethetimedomainident訊cationbrightlyfo

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5、alsystemImpulseresponse如nctionsareemployedtoconstmcttheHankelmatricesTheHankelmatrixcanbedecomposedasa日lmatrixanda月jmatrixbythesingularValuedecomposition日land日jcomprisesprimaryresponsesignalsandnoiserespectiVely：It’ssupp

6、osedthatthesignalsofadynamicsystemismixedwiththewhitenoiseonlythenmakinguseofthecharacteristicofzeroaverage—valueofwhitenoise，theorderofastatespacemodelcanbedeterminedcorrectly：IfthesizeofHankelmatrixhasaproperValue，thou

7、ghthedynamicsystemmixedwithstronglynoise，themethodcanidentifythemodel’sorderexactlyNumericalexamplesinwhichresponsesignalsofadynamicsystemaremixedwithstrongnoiseandactualsignalsmeasuredformanexperimentalinVest譫ationonare

8、inforcedconcreteamestructurearestudiedAsgoingdeepintothehealthmonitoringanddamageidentification，it’sfoundoutthattheeffectofenvironmentcan’tbeignoredInordcrtoopenoutthetemperatureeffectonmodalparameter，impulsetests1asting

9、10hoursona行ameoutsidehadbeenmade，andtheenvironmenttemperatureandbothsurfaces’temperatureofthemiddlecolumnehavebeentrackedrecordwhentestingERAandSIMprogramsaremadebyauthortodealwiththedataachieVedintestThispaperanalyzesth