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Vibration -based non-destructive testing in Offshore Platform

portLA a 13074-MS. 199611AnsysVersion5.6. ANSYSInc. , 275TechnologyDrive,[link widoczny dla zalogowanych], Canonurg, PA1531712RenWei-Xin, RoeckGDe. Discussiononstructuraldamagedetectionfrommodalstrainenergychange. JournalofEngineeringMechanics · ASCE, 2002; 128 (3) :376-377NondestructiveDamageDetectioninOffshorePlatformStructureUsingVibrationMonitoringYangHezhenLiHuajunHuangWeiping (EngineeringCollege.OceanUniversityofChinaQingdao, 266071) AbstractInthispapernondestructivedamagedetection (NDD) inlarge/complexstructuresisinvestigatedbasedonvibrationmonit0ring. Anewmethodofdamagedetectionispresented,[link widoczny dla zalogowanych], whichutilizesaninvariancepropertyofelementmodalstrainen-erRY. ThetheoryofNDDforframetypestructureisformulated. Thismethodiasedonassigningelementmodalstrainen-ergytotwoparts,[link widoczny dla zalogowanych], anddefinestwodamagedetectionindexes. Oneiscompressionmodalstrainenergychangeratio (CMSECR). theotherisflexuralmodalstrainenergychangeratio (FMSECR). ThepresentmodalstrainenergyareobtainedbvincomP1etemoda1shapeandstructuralstiffnessmatrix. Structurehealthmonitoringisthusaccomplishedvlamonitoringtheelementa1CMSECRandFMSECR. Severaldamagecasesaresimulatedwithanoffshoreplatformnumericalmodel (FEM), andpresentedtoillustratetheutilityoftheproposedmethod. Accordingtotheresults, theproposedmethodisshowntobeeffectiveforthecomplexstructuraldamagedetectionandhassatisfactoryprecision. Keywords: structurevibration; nondestructivedamagedetection; offshoreplatformstructure; modalstrainenergy; stuc-turalhealthmonitoring Young and the first vibration of the male , Ph.D. ,[link widoczny dla zalogowanych], December 1977 students. Tel : (0532) 5903076; E-mail: yanghezhen ~ hotmail'comrr-T

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