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1、null 2010Mnull 8仪 表 技 术 与 传 感 器Instrumentnull Techniquenull andnull Sensor2010nullNonull8null : S / v (200740)l : 2010- 04- 21null l : 2010- 05- 30 l o q * o J M Y陈null 渊( S / v , null 710054)null null K 1 :在焊接缺陷的超声检测中,对缺陷进行定性分析是超声无损检测与评价的关键内容,也是超声检测研究领域的热点和难点b针对焊接缺陷超声回波信号的特点,利用小波包变换提取反映缺陷性质的特征值,运用概
2、率神经网络对缺陷进行识别,并与 BP网络aRBF网络的识别结果进行比较b实际焊接缺陷的实验结果表明,概率神经网络的识别正确率高,训练和测试速度快,可靠性高b1 o M :焊接缺陷;超声检测;小波包;概率神经网络;识别 m s | : TB553null null null D S M : Anull null null c I | : 1002- 1841(2010)08- 0089- 04Recognition ofWeldingFlawsBased onWaveletPacketandPNNCHEN Yuan(CollegeofScience, XinullanUniversity ofS
3、cienceandTechnology, Xinullan 710054, China)Abstract: In ultrasonic testing ofwelding flaws, thequalitative analysis for flaws isa key content, hotanddifficultpointofulnulltrasonicNDT andNDE. Aimed at the characteristicsofultrasonic echonullsignalsofweld flaws, waveletpackettransform wasappliedto ex
4、tracting flaw features, and flawswere recognisedby usingprobabilisticneuralnetwork (PNN). Then, itsrecognition resultwascomparedw ith thatofBP andRBF neuralnetwork. The experimentalresultsfor actualwelding flawsshow thatthe recognition accunullracy ofPNN ishigh, its training and testing speed is fas
5、t, moreover, the reliability isalsohigh.Keywords:welding flaws; ultrasonic testing; waveletpacket; PNN; recognition0null + o % J y Y ,o V E i J bo J i , Y a. # # ! ! a! , H ? 3 Y # b o ,A o _ b 2 _ / V _ q = J a J _ 1,y N o _ ,1 , , . | 2 _ J M Y . , 2002, 38( 4): 84- 87.9null LI J, ZHAN X, ZENG Z,
6、et a.l Research on automatic flaw classificanulltion and feature extraction ofultrasonic testing. Key EngineeringMatenullrials, 2008, 381- 382: 631- 634.10null f . MATLAB* ! 9 . : ,2009.T e : (1975- ), = , V , p V , 1 Z _ :? _ e a e / bEnullmai:l chenyuan1030 126. com(上接第 53页) 4 7 aQ 7 M w L ,MATLAB
7、 figurew indow V A 3 L H t m , m 4 U b MATLAB _ F OPC ,V F V A M ? 3 M bm 4null MATLABL H w L4null s F OPC ? ,P 5 V e V B 8 ,V 7 8 v H W , 5 r B y ? Z , z - b I D : 1null , ,F . OPC/ # F q S e .N V / . , 2006(5): 24- 26.2null T . OPC/ S d . e 9 , 2008,21( 6): 42- 43. 3null l X , , . B 7 bs T S ! 9 .
8、9 , 2008, 44(26): 71- 73.4null ,a . OPC Matlab F Y . 1 ! ! , 2007, 27(7): 113- 115.T e : (1962& ), q , V 3 = , 1 V Y 0 . d 1 Z S T bEnullmai:l wyf792 163. com(上接第78页)v m 9 U , Y V M d z | z | V bm 10null 10mmd o 5null k s , ! 9 d T . _ ? w ZE V b Z E 1 , | ,2 ; e ,? 0 / V L T ; | L M Y ,_ d e + b I D :1null U , , , . . C ? Z t . / , 2003, 22(12): 5- 8.2null F . H T . . : S v , 2005.3null , ,d = . . _ / . : S , 2007.4null u . .d . / : . q : v , 1994.5null R X .d . :9 , 1984.6null w ,C .d / . : , 1984.T e :F (1958& ), q ,p V , 1 V Y B 8 a e / Z S bE- mai:l shiyp58 yahoo. com. cn
