虞爱平,刘涛,刘利源,等. 在役RC柱声发射信号传播特性研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024080040

YU A P, LIU T, LIU L Y, et al． Study on the propagation characteristics of acoustic emission signals from in-service RC columns [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787.2024080040.

在役RC柱声发射信号传播特性研究(网络首发)

虞爱平1，刘涛1，刘利源1，苗天娇1，虞小平2

1. 桂林理工大学 广西绿色建材与建筑工业化重点实验室，广西 桂林 541004； 2. 桂林理工大学南宁分校，广西 崇左 532100

摘要: 目的 在役RC柱复杂的材料参数及结构形式对声发射技术在其中的应用造成了巨大挑战，为明确在役RC柱中声发射信号的传播特征，本文开展了在役RC柱声发射检测试验。 方法通过声发射幅值参数、能量参数、中心频率参数、FFT、WPT分析了不同传播距离下在役RC柱声发射信号衰减规律。结果 试验结果表明：声发射信号能量、幅值、中心频率在传播距离小于500 mm时随传播距离增加整体呈衰减趋势，大于500 mm时几乎不再衰减，对能量参数进行负指数拟合，其衰减系数为0.009 3；信号在传播至400 mm时，波的主要成分开始发生剧烈变化，传播至500 mm时，波的主要成分完全改变，波型改变，且传播距离大于500 mm时传感器接收的信号包含大量噪音波；声发射频域信号的主频随传播距离的增加由高频向低频逐渐转移；传播距离小于200 mm时，高频带信号能量向低频带转移较快，总体而言，低频带信号能量占比随传播距离增加呈持续上升趋势，当信号传播至700 mm时，频带1能量占比达到95.98 %。结论 低频信号在远距离传播中更有优势，而高频信号则更容易衰减。不同类型的波会对声发射检测造成阻碍，传感器接收到的信号应以同一类波为准，故对在役RC柱进行声发射检测时，相邻传感器间的布置距离不宜大于400 mm，不应大于500 mm。

关键词: 在役RC柱；幅值；能量；中心频率；FFT；WPT

doi: 10.16186/j.cnki.1673-9787.2024080040

基金项目: 国家自然科学基金资助项目（51968014）；广西研究生教育创新计划项目（YCSW2024359）；广西自然科学基金资助项目（2022GXNSFAA035553）

收稿日期：2024-08-23

修回日期：2024-10-10

网络首发日期：2026-07-16

Study on the propagation characteristics of acoustic emission signals from in-service RC columns (Online)

YU Aiping1, LIu Tao1, LIU Liyuan1, MIAO Tianjiao1, YU Xiaoping2

1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin University of Technology， Guilin 541004, Guangxi, China; 2. Guilin University of Technology at Nanning, Chongzuo 532100, Guangxi, China

Abstract: Objectives The complex material parameters and structural forms of in-service RC columns pose significant challenges to the application of acoustic emission technology. To clarify the propagation characteristics of acoustic emission signals in in-service RC columns, this paper conducted acoustic emission detection experiments on in-service RC columns. Methods The attenuation law of acoustic emission signals of RC columns in service at different propagation distances is analyzed by acoustic emission amplitude parameters, energy parameters, center frequency parameters, FFT, WPT. Results The experimental results show that the energy, amplitude and center frequency of acoustic emission signal tend to decay with the increase of propagation distance when the propagation distance is less than 500 mm, and almost no longer decay when the propagation distance is greater than 500 mm. The attenuation coefficient of the energy parameter is 0.0093 by negative exponential fitting. When the signal is propagated to 400 mm, the main component of the wave begins to change dramatically; when it is propagated to 500 mm, the main component of the wave completely changes and the type of the wave changes; and when the propagation distance is greater than 500 mm, the wave received by the sensor contains a large number of noise waves; The main frequency of acoustic emission frequency domain signal gradually shifts from high frequency to low frequency with the increase of propagation distance. When the propagation distance is less than 200 mm, the energy of the high-frequency band signal transfers rapidly to the low-frequency band. In general, the energy proportion of the low-frequency band signal shows a continuous upward trend with the increase of the propagation distance. When the signal reaches 700 mm, the energy proportion of the frequency band 1 reaches 95.98%. Conclusions Low frequency signals are more advantageous in long-distance transmission, while high frequency signals are more easily attenuated. The presence of different wave types poses challenges to the detection of acoustic emissions, necessitating that the received signal by the sensor corresponds to the same wave type. Therefore, during acoustic emission detection of RC columns in service, it is recommended to maintain an arrangement distance between adjacent sensors not exceeding 400 mm and not surpassing 500 mm.

Key words: in-service RC columns; attenuation; amplitude; energy; FFT; WPT