第45卷第1期2024年1月仪器仪表学报ChineseJournalofScientificInstrumentVol.45No.1Jan.2024DOI:10.19650/j.cnki.cjsi.J2311514收稿日期:2023-06-02ReceivedDate:2023-06-02基于环形阵列的空间滤波器结构损伤扫描监测方法研究常琦,徐勇,赵恒(西安理工大学机械与精密仪器工程学院西安710048)摘要:本文提出了一种基于环形阵列的空间滤波器结构损伤扫描监测方法,在结构中央布置环形压电传感器阵列实现对结构的全方位扫描监测,消除了主动Lamb波空间滤波器监测方法中盲区及远场对监测效果的影响。环形阵列由直径方向不同角度的4个线阵组成,每个线阵采用主动Lamb波空间滤波监测方法对结构损伤进行监测、成像,各阵列成像结果通过PCA-小波变换进行融合对损伤位置进行判别,从而实现结构全方位损伤扫描监测,消除单个阵列损伤监测的盲区、远场及虚假成像等影响,进而获得更加准确的损伤监测结果。通过实验研究,验证了该方法的有效性和实用性。关键词:Lamb波;空间滤波器;损伤扫描监测;多阵列成像融合中图分类号:TH212TH213.3文献标识码:A国家标准学科分类代码:590.65ResearchonthespatialfilterstructuredamagescanningmonitoringmethodbasedoncirculararrayChangQi,XuYong,ZhaoHeng(SchoolofMechanicalandPrecisionInstrumentEngineering,Xi′anUniversityofTechnology,Xi′an710048,China)Abstract:Inthisarticle,aspatialfilterstructuredamagescanningmonitoringmethodbasedontheannulararrayisproposed.Theannularpiezoelectricsensorarrayisarrangedinthecenterofthestructuretorealizetheomnidirectionalscanningmonitoringofthestructure,whicheliminatestheinfluenceoftheblindareaandfarfieldonthemonitoringeffectintheactiveLambwavespatialfiltermonitoringmethod.Thecirculararrayconsistsoffourlineararrayswithdifferentanglesinthediameterdirection.EachlineararrayusestheactiveLambwavespatialfilteringmonitoringmethodtomonitorandimagethestructuraldamage.TheimagingresultsofeacharrayarefusedbythePCA-wavelettransformtoidentifythelocationofdamage.Thus,theomnidirectionaldamagescanningmonitoringofthestructureisrealized,andtheblindarea,far-field,andfalseimagingofsinglearraydamagemonitoringareeliminated.Then,moreaccuratedamagemonitoringresultsareobtained.Theeffectivenessandpracticabilityofthemethodareverified...
