空間網(wǎng)架結(jié)構(gòu)的損傷識(shí)別.pdf

1、大連理工大學(xué)碩士學(xué)位論文空間網(wǎng)架結(jié)構(gòu)的損傷識(shí)別姓名：張亮申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：宋玉普20071221空間網(wǎng)架結(jié)構(gòu)的損傷識(shí)別Damageidentificationofspacesteel鰣ds仃uctureAbstractSteel鰣dstructure，which鋤fIllfiltheneedsoflongspanspatial鋤cturcs，hasgainedgrowingpopularityathomeanda

2、bro跚LAsthis翻ructll∞hasalargespanandCanservemanypeopleallaccidentwillthreatenpeoplelifeandc眥sehugeeconomiclossesandpropertylossThere越emanycollapseendaccidentsoflongspanspatialslraettⅡesinlatestyears。soitisimportanttoident

3、ifyandmonitorspace鰣dslz仙ctureInthefieldofidentificationtherealemanymaturemethodswhich戤dividedintotwoparts：StaticandDynamicMethodsItisconvenienttogetthewholestateofstnld呲ebydynamicmethodwhichisoperatedbygettingthemodepara

4、meterssuchasfrequencyandmodeshapeandismOreusefulforspacenllssInthispaperbased011theexperimentofatnlss，modalmethodsarcusedandanalysedwiththemodepalameterssuchasfTequencyandmodeshapeobtainedbydynamicaltests啊塢validityandrob

5、ustnessofdifferentmethods虢comparedbyaddingwhitenoisetothedatumofnumericalsimulafi∞withAnsysResultsshowthatthedamageof11“RSSCanbeeffectivelyidentifiedbythemethodofmodalstrainenergyplusLSSVMOeastsqualesupportvectormachine)

6、ModalstrainenergyisusedtoidentifytheprobabledalllageelementsandtheexactdanlagelocationandextentcanbeattainedbyusingLSSVMThismethodisverifiedbynumericalsimulationofaspaceIFllS$withsomenosieFinallyoptimalsensorplacementand

7、howt0identifyspace血麟withincompletemodedataaleanalyzedbecauseitisimpossibletogetthecompletemodedataofspaceIIUSSwhichhastOOmanyelementsResultsattainedbynumericalsimulationofsignald鋤a∞elementverifythatthemethodcombinedbyeff