衰减
介观物理学
超声波传感器
声学
波形
波传播
振幅
材料科学
散射
信号(编程语言)
无损检测
超声波检测
时域
光学
计算机科学
物理
电信
雷达
量子力学
计算机视觉
程序设计语言
作者
Kazuyuki Nakahata,Gun Kawamura,Tadasi Yano,Sohichi Hirose
标识
DOI:10.1016/j.conbuildmat.2014.12.049
摘要
To understand the characteristics of ultrasonic wave propagation in concrete more completely, we propose a time domain simulation tool based on the finite integration technique (FIT) and an image-based modeling approach. When modeling ultrasonic wave propagation in concrete, it is important to introduce three-dimensional mesoscopic and microscopic structures because ultrasonic waves in solids are transmitted by mechanical interaction between adjacent media. In this paper, wave velocity, center frequency, and attenuation of ultrasonic waves in concrete are evaluated quantitatively by comparing the waveforms obtained by FIT simulation with those obtained by experimental measurement. It was observed that these factors were in good agreement between the simulation and measurements. It was also observed that amplitude of the transmitted signal was sensitive to the allocation pattern of the aggregates. Thus, attenuation due to multiple scattering by aggregates is more dominant than the attenuation by intrinsic absorption and geometrical spreading in concrete.
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