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时间:2020-03-25
《基于时间反转聚焦的声发射源定位算法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第11期传感技术学报V01_28No.112015年11月CHINESEJOURNALOFSENSORSANDACTUATORSNOV.2015LocationAlgorithmforSourceofAcousticEmissionBasedonTimeReversalLIQiufeng一,CHENJianjuan,HECaihou2,ZHANGWei,LIShuaihui,CHENJile(1.KeyLaboratoryofNDT,MinistryofEducation,NanchangHangkongUniversity,Na
2、nchang330063China;2.YingtanBranchofSpecialEquipmentInspectionandResearchInstituteofJiangxi,YingtanJiangxi335000China;3.LaboratoryofModernAcousticsofMOE,NanjingUniversity,Nanjing210093China)Abstract:Becauseacousticemission(AE)testingcanjudgetheactivityandseverityofthedamag
3、e,ithasbeenwidelvused.Butthereisstillnomoreaccuratelocationmethodfordamagesourceposition.AmethodbasedontimereversaltheoryiSproposedtoaccuratelylocatetheacousticemissionsourcehere.Accordingtothecharacteristicsofacousticemissionpassivemonitoring,thesignalenergyofacousticemi
4、ssioncouldbeoverlappedandamplifiedbytimereversalfocusingmethod.andfurthermorethesignaltonoiseratio(SNR)isimproved,andthenenhancingandfocusingprocessareanalyzedanddeducedaboutsignalfromdamagesourceprocessedbytimereversal;Thesignalpropagationwaveimagecanbereconstructedbytak
5、ingadvantageofadaptivefocusingoftimereversaltheorytotheacoustiCemissionsource,andthepositionofdamagesourceisrevealedthroughthesignalfocusing;Andfinal-lv.themethodhasbeenverifiedthroughthenumericalsimulation,andsimulationresultsshowitcaneffectivelyim-provesignalenergyofthe
6、damagesource,andthepositionofthedamagesourcecanbeshownaccuratelythroughsignalreconstructionandlocationinthedetectionarea,andthelocationaccuracyisgreatlyimprovedbycomparingwiththe0nventi0na】time-of-arriVa】1ocationmethod.Keywords:AEtesting,damagelocation,timereversal,focusi
7、ngenhancementEEACC:7220;7230doi:10.39690.issn.1004—1699.2015.11.014基于时间反转聚焦的声发射源定位算法李秋锋,陈建娟,何才厚,张维,李帅辉,陈积乐(1.南昌航空大学无损检测技术教育部重点实验室,南昌330063;2.江西省特种设备检验检测研究院鹰潭分院,江西鹰潭335000;3.南京大学近代声学教育部重点实验室,南京210093)摘要:声发射检测可以判断损伤的活性和严重性而被广泛应用,但对损伤位置仍没有更准确的定位方法。提出一种基于时间反转理论的声发射源准确定位的方法。根据
8、声发射被动监测的特点,研究采用时间反转聚焦方法使声发射信号能量叠加放大,提高信号的信噪比,并分析推导了具体损伤声源信号时间反转聚焦增强过程;利用时间反转对声发射源的自适应聚焦能力,重建信号传播
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