基于导波理论的管道泄漏声发射定位新技术研究

NEW TECHNIQUE FOR MODAL ACOUSTIC EMISSION PIPELINE LEAK LOCATION

由于泄漏声发射信号的多模态特性和在管道内传播过程中的频散特性,使得通过相关分析进行管道泄漏定位的效果很差。根据模态声发射理论,将圆管中导波传播理论应用于管道泄漏的声发射检测,建立了管道中泄漏声发射信号的多模态传播模型。利用管道中导波传播的频散特性,在提取单一模态导波基础上,提出了一种实用的声发射泄漏定位方法。泄漏定位试验证明了该方法的有效性。

Due to the multi modes and dispersion nature of acoustic emission (AE) propagating in pipeline, traditional cross correlation technique do not perform well for acoustic leak location. Based on the theory of modal acoustic emission, the principle of guided waves in pipe is applied to AE leak location, and an acoustic leak model with dispersive multi-mode is developed. With the disperse characteristic of guided waves in pipe, an individual mode is isolated by the time-space analysis of the acoustic leak signals. Further more using the information of the individual mode a new leak location model is brought out. Leak location experiments are conducted to verify the validity of the location technique. It is indicated that the acoustic leak location model is practical and effective to locate the leak both of the liquid and gas.