Application of Lamb Wave in Detecting Boiler Heating Surfaces
摘 要
为提高火电厂锅炉受热面管检测的可靠性和效率,研究了针对受热面管吹损的超声兰姆波检测技术。以4.00 mm壁厚的管材为例,通过求解频散方程,分析了兰姆波传播的频散特性。结果表明:声束入射角为35.2°,激励频率为500 kHz时,对于未发生吹损的管材,S0和A0模态的端面回波在时间域上会连续叠加;对于发生吹损的管材,S0和A0模态的端面回波在时间域上存在间隔,通过时间间隔可判断吹损程度。试验结果为火电厂锅炉受热面管的检测提供了一种高效高精度的无损检测方法。
Abstract
To increase the reliability and efficiency of ultrasonic inspection for the boiler heating surfaces, the ultrasonic lamb waves and their applications to the blowing inspection of blowing damages of heating surfaces were studied. The dispersion characteristics of lamb waves were analyzed by solving the dispersion equations in the pipes with a thickness of 4.00mm. The results showed that the echoes of S0 and A0 modes in the end face of non-blowing pipes were superimposed continuously at time domain, while the situation was different in the blowing pipes as the incident angle being 35.2° and the frequency being 500 kHz, and the extent of blowing damages in the pipes was decided by time interval of the two modes. A high accuracy and precision non-destructive testing method for the boiler heating surfaces was provided.
中图分类号 TG115.28 DOI 10.11973/wsjc201710014
所属栏目 实验研究
基金项目
收稿日期 2017/3/10
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备注彭碧草(1982-),男,高级工程师,主要从事电力设备检测和失效分析
引用该论文: PENG Bicao,LONG Yi,ZHOU Mengbao,HE Pengfei,CAO Zhi,WANG Zexiang. Application of Lamb Wave in Detecting Boiler Heating Surfaces[J]. Nondestructive Testing, 2017, 39(10): 64~67
彭碧草,龙毅,周梦保,何朋非,曹智,王泽湘. 兰姆波在检测锅炉受热面管中的应用[J]. 无损检测, 2017, 39(10): 64~67
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参考文献
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【2】SG P, WR P, LECUYER F, et al. Broadband Lamb wave measurements in aluminium and carbon/glass fibre reinforced composite materials using non-contacting laser generation and detection[J]. Ultrasonics, 1997, 35(2):105-114.
【3】刘镇清. 无损检测中的超声兰姆波[J]. 无损检测,1999,21(9):409-413.
【4】裴俊峰,邓明晰. 固体板材参数变化对超声兰姆波模式的影响[J]. 声学技术,2007(5):1016-1017.
【5】禹化民,王维斌,吕小青,等. 储罐底板缺陷兰姆波检测的影响因素[J]. 无损检测,2015,37(7):19-24.
【6】GUO D, KUNDU T. A new transducer holder mechanism for pipe inspection[J]. Journal of the Acoustical Society of America, 2001, 110(1): 303-309.
【7】杨齐,陈定岳,陈虎,等. 压力容器板材中氢鼓泡缺陷的超声Lamb波检测[J]. 无损检测,2016,38(10):53-59.
【8】邢耀淇,高佳楠,陈以方. 超声近场导波在薄壁管检测中的应用[J]. 无损检测,2016,38(2):5-8.
【9】石欢,周飞旭,彭应秋. 压力管道检测中单探头导波的激励与接收[J]. 无损探伤,2008,32(2):21-22.
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