简介:Basedonexperimentmodalanalysis(EMA)andoperationmodalanalysis(OMA),thedynamiccharacteristicsofcylindricalgrindingmachineweremeasuredandprovidedabasisforfurtherfailureanalysis.Theinfluencesofgrindingparametersondynamiccharacteristicswerestudiedbyanalyzingthediagnosticsignalsextractedfromracingandgrindingexperiments.Thesignificantfrequencyof38Hzrelatedtogrindingwheelspindlespeedof2307r/minshowedthatthewheelspindlesystemwasinastateofimbalan...
简介:Thispaperdescribes,bymeansofaVoronoihypersphere,thenearestneighborrelationsofallthefeaturesubmatricesinthefaultclassificationspaceandanalysesthedeviationdisturbanceanglesbetweenfaultfeaturesubmatricesandak-dimensionunitarymatrixofthemeasuredvoltagechangematrix.Withtheabovetwoconcepts,thispaperdiscussesthediagnos-abilityinthefaultclassificationapproach.Thepaperalsoclassifiesanddefinesthefaultdiagnosisproblems.Finally,thepaperderivesthecorrespondingnecessaryandsufficientconditionsforcorrectlocationoffaults.
简介:Greatearthquakesoftenoccuralongornearactivefaultbelts.Thus,monitoringandresearchonfaultdeformationarequiteimportant.Methodssuchasshort-leveling,shortbaselineandintegratedmonitoringprofileacrossfaultbeltshavebeenusedtomonitorfaultactivitiesformanyyears.GNSSobservationsaremainlyusedtoobtainthehorizontalvelocityfieldinlargeareasandtostudytheactivitiesanddeformationofmajorblocks.GNSStechnologyhasbeenusedtomonitorandstudythedeformationoffaultsfromadifferentaspects.Inthispaper,someapplicationsandnewexplorationsofGNSSarediscussed.Theyare:(1)Researchandmonitoringofstrike-slipactivitiesoffaultswithGNSS.(2)ResearchandmonitoringofverticalactivitiesoffaultswithGNSS.(3)Investigatingthelawsofdeformationofblocksonthesidesoffaultzoneandsettingupstrainmodelstodeducetheactivitiesanddeformationoffaultswithrespectivemodelsandcomparethededucedresultswiththeactualmeasurementsacrossfault.Itisconcludedthatalargerdiscrepancybetweenthededucedandtheobserveddeformationindicatesastrongerinteractionbetweentheblocks,whichcanbeimportantforpredictingthelocationofastrongearthquakeandassessingseismichazard,aswellastheseismicitytrend.