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 Wysłany: Nie 3:23, 08 Maj 2011 Temat postu: Franklin and Marshall uk Vibration -based non-dest |
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Vibration -based non-destructive testing in Offshore Platform
portLA a 13074-MS. 199611AnsysVersion5.6. ANSYSInc. , 275TechnologyDrive, Canonurg,Franklin and Marshall uk, PA1531712RenWei-Xin,hollister, RoeckGDe. Discussiononstructuraldamagedetectionfrommodalstrainenergychange. JournalofEngineeringMechanics · ASCE, 2002; 128 (3) :376-377NondestructiveDamageDetectioninOffshorePlatformStructureUsingVibrationMonitoringYangHezhenLiHuajunHuangWeiping (EngineeringCollege.OceanUniversityofChinaQingdao, 266071) AbstractInthispapernondestructivedamagedetection (NDD) inlarge/complexstructuresisinvestigatedbasedonvibrationmonit0ring. Anewmethodofdamagedetectionispresented, whichutilizesaninvariancepropertyofelementmodalstrainen-erRY. ThetheoryofNDDforframetypestructureisformulated. Thismethodiasedonassigningelementmodalstrainen-ergytotwoparts,oakley brasil, anddefinestwodamagedetectionindexes. Oneiscompressionmodalstrainenergychangeratio (CMSECR). theotherisflexuralmodalstrainenergychangeratio (FMSECR). ThepresentmodalstrainenergyareobtainedbvincomP1etemoda1shapeandstructuralstiffnessmatrix. Structurehealthmonitoringisthusaccomplishedvlamonitoringtheelementa1CMSECRandFMSECR. Severaldamagecasesaresimulatedwithanoffshoreplatformnumericalmodel (FEM),franklin and marshall clothing, andpresentedtoillustratetheutilityoftheproposedmethod. Accordingtotheresults,christian louboutin sko, theproposedmethodisshowntobeeffectiveforthecomplexstructuraldamagedetectionandhassatisfactoryprecision. Keywords: structurevibration; nondestructivedamagedetection; offshoreplatformstructure; modalstrainenergy; stuc-turalhealthmonitoring Young and the first vibration of the male , Ph.D. , December 1977 students. Tel : (0532) 5903076; E-mail: yanghezhen ~ hotmail'comrr-T
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