基于SH模态导波杆的电站高温结构壁厚测量方法

中国机械工程

基于SH模态导波杆的电站高温结构壁厚测量方法

徐鸿;郭鹏;李鸿源;田振华;邓博

华北电力大学能源动力与机械工程学院，北京，102206

出版日期:2017-04-10 发布日期:2017-04-07
基金资助:
国家自然科学基金资助项目（51134016）;
中央高校基本科研业务费专项资金资助项目（2016XS25）

Thickness Measuring Method of High-temperature Power Plant Structures Based on SH Mode Waveguide

XU Hong ;GUO Peng;LI Hongyuan;TIAN Zhenhua;DENG Bo

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing,102206

Online:2017-04-10 Published:2017-04-07
Supported by:

摘要/Abstract

摘要： 提出了一种基于SH模态导波杆的电站高温结构壁厚测量方法，该方法使用导波杆将压电传感器与高温被测结构隔开。通过研究发现非频散SH模态导波能通过矩形横截面导波杆将导波信号由传感器导入到高温被测结构中。实验验证了通过特定夹具以干耦合方式将导波杆固定在被测结构表面可以获得较好的信号。使用2MHz中心频率下的汉宁窗调制正弦波信号实现了对处于不同温度被测结构壁厚的监测，室温（25℃）时，壁厚测量值与实际厚度相差0.016mm，高温被测结构实验信号也非常好，波速测量值与拟合曲线所得速度值误差范围为0.1%～2.5%。

关键词: 超声导波, SH0模态, 导波杆, 高温, 壁厚监测, 数值模拟

Abstract: It is significant to put forward a thickness measuring method of high temperature power plant structures based on SH mode, which used a waveguide to isolate the transducers from the high-temperature measurement zones. It was found that a nondispersive SH mode guided wave in rectangular waveguide was employed to transmit the guided wave signals from the transducers to the measurement zones. In addition, experiments were investigated by dry-coupled to attach the waveguides to the components, which shows that clamping the waveguides to the component surfaces may get best results. By using Hanning window modulated sine wave signals with 2MHz center frequency, the thickness difference of the measured values and actual values of wall thickness is 0.016mm at the room temperature(25℃). Performance at high temperatures was tested without signal degradation. The error ranges of wave velocity measurement values and the velocities of the fitting curve are 0.1% to 2.5%.

Key words: ultrasonic guided wave, SH0 mode, waveguide, high temperature, thickness monitoring, numerical simulation

中图分类号:

TB559
O347.4

徐鸿, 郭鹏, 李鸿源, 田振华, 邓博. 基于SH模态导波杆的电站高温结构壁厚测量方法[J]. 中国机械工程.

XU Hong , GUO Peng, LI Hongyuan, TIAN Zhenhua, DENG Bo. Thickness Measuring Method of High-temperature Power Plant Structures Based on SH Mode Waveguide[J]. China Mechanical Engineering.

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