球形容活性缺陷的聲發(fā)射逆源問題研究.pdf

1、天津大學(xué)碩士學(xué)位論文球形容活性缺陷的聲發(fā)射逆源問題研究姓名：趙志芳申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：化工過程機(jī)械指導(dǎo)教師：陳旭1999.2.1AbstractInthispaper，aroundthecoreoftheproblemonAcousticEmission(AE)“reversesource”inengineering，theauthorputonekindoftypicalstructureofpressurevesselspher

2、icalvesselasthestudysubtendandtheresearchofmultistagefuzzycOmprehensiVeassessmentofAEsourceinsphericalvesselismadeFirstofall，throughtheanalysisofthepropagationcharacteristicsandtheoriesofelasticstress‘waveintheplate，ther

3、eversingformulaeoftheintensityofsourcehasbeensetup，andmoreoverAcomputersoftwareiscompiledThroughthemimacousticsourceexperimentontheplateofdifferentthickness，thefadingcurveofthesignalamplitudeofacousticsourcechangestOthed

4、istancehasbeendetected，andthereversingformulaeoftheintensityofacousticsourceisverified，theerroroftheamplitudecalculatedforreversesourceis=1dBThroughthe’ktudyofAEcharacteristicsofbustedsphericalvessel，AEcharacteristicsfor

5、thedifferentstagesofloadingandloadholdingareobtainedThereat，thedifferentimportantextentofAEsignalsofdifferenttimeintheevaluationofAEsourceseverityisdetected，whichhasveryimportantsignificanceforintegrityassessmentofpressu

6、revesselsinserviceByuseofsomeconceptsoffuzzydescribingandmembershipgradeofthefuzzymathematics，accordingtotherelatedstandardsandreferencesathomeandabroad，themultistagefuzzycomprehensivemodelandthecomputeranalysisandhandli

7、ngtechniquehasbeenputoutasthefirsttimeAtthesametimethequantitativelevelassessmenttoAEsourcecanbereachedThesoRwareofmultistagefuzzycomprehensiveassessmentisusedtoanalyzethetestingresultof400m3sphericalvesselinfield，anexam

8、pleofmultistagefuzzycomprehensiveassessmentofAEsourceseverityisgivenTheresultshowsthataquantitativelevelcanbereachedbyuseoftheassessmentmethodology，andmeanwhile，itisquitegoodaccordancewiththeresultacquiredbynondestructiV