Effect of Defect Gradient on Ultrasonicguided Wave′s Propagation in Flat Strap
-
摘要: 通过改变扁钢缺陷坡度,探究缺陷坡度对SH0波在变电站接地网扁钢中传播的影响,超声检测结果表明:缺陷坡度对接收信号的强度影响较大,坡度越小,接收信号强度越弱,甚至消失在噪声信号中.这主要是因为不同深度缺陷的波发生反射时波程和相位不同,会导致波的干涉叠加,削弱反射信号的强度.Abstract: This paper explores the effect of defect gradient on ultrasonic guided-wave′s propagation in flat strap.Ultrasonic testing results show that the defect gradient has great influence on the strength of received signal.The smaller the gradient is,the weaker the received signal strength is,and the signal can be as weak as it cannot be distinguished from the noise.This is mainly because the reflected waves in different depth own different phases,which leads to wave superposition and weakens the intensity of reflected signal.
-
Keywords:
- Defect gradient /
- SH0 wave /
- Wave superposition
-
-
[1] 钟茜.电力系统扁钢超声导波无损评价方法研究[D].北京:北京工业大学,2012. [2] 曾宪林.变电站接地网故障的诊断研究[D].北京:北京交通大学,2012. [3] 刘辉,李明贵,陈晓兵.广西电网防雷及接地工作存在的主要问题及对策[J].广西电力,2006,29(30):6-11. [4] 朱正国.变电站接地网故障诊断的研究[J].广东电力,2008,21(1):27-31. [5] 王炯耿,林群,罗宏建,等.接地网扁钢超声导波检测试验研究[J].浙江电力,2012(4):4-7. [6] ALLEYNE D,CAWELY P.The interaction of lamb waveswith defects[J].IEEE Transactions on Ultrasonic,Ferroeletrics,and Frequency Control,1992,39(3):381-397. [7] ZHU W,ROSE J L,BARSHINGER J N.Ultrasonic guided wave NDT for hidden corrosion detection[J].Research in Nondestructive Evaluation,1998,10(4):205-225. [8] BINGHAM J,HINDERS M.Lamb wave characterization of corrosion-thinning in aircraft stringers:Experiment and three-dimensional simulation[J].J.Acoust.Soc.Am.,2009,126(1):103-113. [9] 甘正红,方晓东,余洋,等.国内外钢板超声检测标准对比分析[J].无损检测,2013,35(11):87-92. [10] 蒋韬.金属板材中电磁超声导波检测技术的研究[D].哈尔滨:哈尔滨工业大学,2010.
计量
- 文章访问数: 5
- HTML全文浏览量: 1
- PDF下载量: 6
下载:
