Enhanced air-coupled impact echo technique by phase analysis of signals from multiple sensors

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL
Najjiya Almallah, Nenad Gucunski
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引用次数: 0

Abstract

This paper presents an air-coupled impact echo (IE) technique that relies on the phase spectrum of the collected data to find the frequencies corresponding to the reflections from delaminations. The proposed technique takes advantage of the fact that the IE compression wave is not a propagating wave, but it is the 1st order symmetrical (S1) mode Lamb wave at zero group velocity (S1-ZGV). Therefore, it searches the phase spectra of the data collected by multiple sensors to locate the frequency corresponding to the lowest phase difference. As a result, the technique reduces the effect of propagating waves, including the direct acoustic wave and ambient noise. It is named the Constant Phase IE (CPIE). The performance of the CPIE is experimentally compared with the regular amplitude spectrum-based IE technique and two other multisensor IE techniques. The CPIE shows a performance advantage, especially in a noisy environment.

通过对多个传感器的信号进行相位分析,增强空气耦合冲击回波技术
本文介绍了一种空气耦合冲击回波(IE)技术,该技术依靠采集数据的相位频谱来找到与分层反射相对应的频率。所提出的技术利用了 IE 压缩波不是传播波,而是零群速度(S1-ZGV)下的一阶对称(S1)模 Lamb 波这一事实。因此,它可以搜索多个传感器采集数据的相位频谱,找出相位差最小的频率。因此,该技术减少了传播波的影响,包括直接声波和环境噪声。该技术被命名为恒定相位 IE(CPIE)。在实验中,CPIE 的性能与基于振幅频谱的常规 IE 技术和其他两种多传感器 IE 技术进行了比较。结果表明,CPIE 在性能上具有优势,尤其是在噪声环境中。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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