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1、Newimageprocessingtoolsforstructuraldynamicmonitoring1*21J.Morlier,P.Salom,F.Bos1LRBBmixedunitCNRS/INRA/Bordeaux1,69routed’Arcachon,33612CestasGazinet,France*Presentaddress:IGM,LMS,SUPAERO,10avenueEdouardBelin,31055Toulouse,France2LAPS,CNRS/ENSEIRB/Bordeaux1,351coursdelaLibération33405Talence
2、,Francejoseph.morlier@supaero.fr;salom@enseirb.fr;bos@lrbb.u-bordeaux.fr.Keywords:Dynamicmonitoring,motionestimation,imageprocessing,vibrationmeasurementAbstract.Thispaperpresentsanintroductiontostructuraldamageassessmentusingimageprocessingonrealdata(nonidealconditions).Ourcontributionismuch
3、moreagroundworkthanaclassicalexperimentalvalidation.Aftermeasuringthebridgedynamicparameteronasmallresolutionvideo,weconjointlypresentadvantagesandlimitationsofourmethod.Finallyweintroduceseveral“computervision”basedrulesandfocusonthetechnicalabilitytodetectdamageusingcameraandvideomotionesti
4、mation.IntroductionInmechanicalengineering,modalcontroliswidelyusedtoassesscivilengineeringstructuresbymeansofvibrationmeasurement.Indeedvibrationmonitoringisalowcostandnondestructivetoolwhichcouldevenbeusedwithnaturalexcitation(wind,traffic...).TheparadigmofStructuralHealthMonitoring(SHM)app
5、roachindamagedetectionisbasedontheassumptionthatmodificationsofstructuralpropertieswillalterthedynamiccharacteristicsofthestructure(i.e.,resonantfrequencies,modaldampingandmodeshapes)[4].Manyresearchers[5,8,9]focusedtheirstudiesonthecharacterizationofthestructuralmodeshapeswhichcontainspatial
6、informationandappeartobemoresensitivetothepresenceofdamagezonesthannaturalfrequencies.Thegoalofourworkistodevelopamethodtoreplaceclassicalcontactaccelerometersbasedinstrumentationwithanopticalcameraworkingwithanintelligentsoftwaretocontinuouslyassessthedynamicparameters(frequency,dampingandmo
7、deshape)ofthestructureunderstudy.Previousworks[10,11,13]obtainedmodalparametersinintroducingrealtargetsonthestructureorinstudyingsimplestructureinidealconditions.Ourgoalisnottocompareourmethodwithclassicalmodaltestingbuttoshowtheabilityofboth
