Nonlinear Ultrasonic Detection Method of Collinear Wave Mixing for Thermal Damage in High Temperature Pipeline
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摘要: 面向电厂安全运行需要，开展了高温管道热损伤共线混频非线性超声检测方法研究。通过扫频实验，确定了显著混频效应的激励条件，并对4个不同热损伤程度的Super304H管材进行非线性超声检测实验。对检测信号进行双谱分析，研究和频分量的双谱值在相位区间的分布，确定了热损伤引起的非线性响应在相位区间上的分布范围。结果表明，依次提取的非线性声学系数与试件的热损伤程度呈现很好的相关性，可用于管道热损伤的表征。研究工作为电厂高温管道热损伤检测提供了可行方案。Abstract: Aiming at the need of safe operation of power plant, the nonlinear ultrasonic detection method of thermal damage of high temperature pipeline by collinear mixing is studied. The excitation conditions of significant mixing effect were determined by frequency sweep experiment, and nonlinear ultrasonic testing experiments were carried out on four Super304H pipes with different thermal damage degrees. The detection signals were analyzed by bispectrum to investigate the distribution of bispectrum of sum frequency component in phase interval, and the phase distribution range of nonlinear response caused by thermal damage was determined. The results show that the nonlinear acoustic coefficients extracted in turn have a good correlation with the thermal damage degree of the specimen, which can be used to characterize the thermal damage of the pipeline. The research work provides a feasible scheme for thermal damage detection of high temperature pipelines in power plants.
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Key words:
- High temperature pipeline /
- Thermal damage /
- Wave mixing nonlinear /
- Ultrasonic test /
- Bispectrum
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图 1 共线混频非线性超声检测实验系统示意图
R—接收探头；T—发射探头；f3—混频分量
Figure 1. Schematic Diagram of the Experimental System
图 6 混频幅值随激励信号频率变化的关系
Figure 6. Relationship between Mixing Amplitude and the Excitation Frequency
图 10 不同相位下和频处双谱值的变化趋势
Figure 10. Change of Bispectral Peaks of Sum Frequency under Different Phase
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