CAJ | 학술논문

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。
이용초성파신호검측파문관공도중압장밀실도。운용COMSOL Multiphysics연건대공기포불동장축반경적파문관공도압장모형진행료방진，연구료불동공기포장축반경대접수투사신호파형급빈보적영향，연구료공기포장축반경대공솔보밀도화평균공솔적영향。수치결과분석표명，재공기포소우파문관범위내，공기포장축반경월대，접수투사신호적후속파폭취월대，빈보폭치월대，공솔보밀도함수쇠감월만，평균공솔월대。
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 bubble’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 .