波纹管孔道压浆密实度超声仿真分析

Analysis of ultrasonic simulation on duct grouting density of bellows

利用超声波信号检测波纹管孔道中压浆密实度。运用COMSOL Multiphysics软件对空气泡不同长轴半径的波纹管孔道压浆模型进行了仿真,研究了不同空气泡长轴半径对接收透射信号波形及频谱的影响,研究了空气泡长轴半径对功率谱密度和平均功率的影响。数值结果分析表明,在空气泡小于波纹管范围内,空气泡长轴半径越大,接收透射信号的后续波幅就越大,频谱幅值越大,功率谱密度函数衰减越慢,平均功率越大。

This article detects the duct grouting density of bellows by using the ultrasonic signal. The simulation by COMSOL Multiphysics software includes some models of different air buhble＇s major axis radius of defect, which can research the influence of different air bubble＇s major axis radius of defect on the transmissive signal waveform received by the transducer , spectrum , the power spectral density and the average power based on this basis. The numerical results indicate that under the larger air bubble＇s major axis radius, the larger the volatility on the follow up of the reflected signal , the larger the spectrum, the slower the decays of the power spectral density function, and the larger the average power in the bellows; on the contrary, under the smaller air bubble defect, the smaller the volatility on the follow-up of the reflected signal , the smaller the spectrum, the faster the decays of the power spectral density function, and the smaller the average power in the bellows.