| 张曦,章兰珠.声发射衰减特性管道泄漏定位方法*[J].,2022,41(1):158-167 |
| 声发射衰减特性管道泄漏定位方法* |
| The pipeline leakage location method based on acoustic emission attenuation characteristics |
| 投稿时间：2021-01-11 修订日期：2022-01-03 |
| 中文摘要: |
| 声发射技术具有灵敏度高、实时性强、覆盖范围大等优点。输气管道泄漏产生声波在传播过程中发生衰减，综合考虑介质黏滞吸收和热传导及金属管道晶粒散射和热流损失，从理论上建立声波衰减模型，通过实验对衰减系数进行拟合，验证了衰减模型的准确性。针对声发射频带宽的特点对传统衰减定位模型进行改进，提出宽频带声发射源定位模型，该方法先通过实验确定泄漏声发射信号频率范围，将信号经过切比雪夫带通滤波、小波包分解后，利用各小波包节点能量进行定位。针对无法完全滤除的噪声提出三传感器定位模型，利用三组信号互相做差以减小噪声的影响。实验表明：采用宽频带定位模型比传统定位模型更具优势，泄漏率为60ml/min时定位误差从8.90%减小3.43%；增加一个传感器后误差进一步减小到2.59%，证明了本文定位模型的准确性。 |
| 英文摘要: |
| Acoustic emission (AE) technology has the advantages of high sensitivity, strong real-time and large coverage. The acoustic wave generated by gas pipeline leakage attenuates in the process of propagation. Considering the viscous absorption and heat conduction of medium, the scattering and heat flux loss of metal pipeline, the acoustic wave attenuation model is established theoretically. The accuracy of the attenuation model is verified by fitting the attenuation coefficient through experiments. The traditional attenuation localization model is improved according to the characteristics of acoustic emission wide frequency band, and a wide-band localization model is proposed. Firstly, determine the frequency range of the leakage AE signal. Denoise the signal by Chebyshev band-pass filter, then decompose it by wavelet packet, and the energy each wavelet packet node is used to locate. A three-sensor localization model is proposed for the noise that cannot be completely filtered, which uses three sets of signals to make differences to reduce the influence of noise components. Experiments show that the wide-band localization model is more advantageous than traditional one in short distance transportation. When the leakage rate is 60ml/min, the localization error decreases from 8.90% to 3.43%. After adding a sensor, the error is further reduced to 2.59%, which proves the accuracy of the localization model in this paper. |
| DOI：10.11684/j.issn.1000-310X.2022.01.019 |
| 中文关键词: 管道泄漏 声发射 衰减模型 小波包分解 定位模型 |
| 英文关键词: Pipeline leakage,Acoustic emission,Attenuation model,Wavelet packet decomposition,Positioning model |
| 基金项目:(51975213) |
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| 摘要点击次数: 1053 |
| 全文下载次数: 1988 |
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