管道液漏累积检测系统的特性分析

Oleg Krasylnikov, V. Beregun, Tetiana Polobiuk
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引用次数: 0

摘要

由于管道泄漏引起的流体泄漏所产生的噪声信号一般具有非高斯分布,因此为了进一步发展声接触泄漏检测与相关谱方法的结合,建议采用非高斯过程的概率分析方法,特别是噪声诊断的累积量方法。考虑了管道运行过程中液体泄漏检测的累积量法原理,该方法基于利用累积量来区分在管道段控制点处注册的噪声信号,即利用信号累积量向量与信号相互相关函数之间的距离。给出了液体泄漏检测累积量系统的框图。为了将累积泄漏检测系统应用于电厂的泄漏诊断,设计了一种声学泄漏检测系统的布置图,即对噪声信号进行采集、配准和统计处理,从而判断是否泄漏的软硬件综合体,给出了系统硬件部分的参数。为了估计真实泄漏信号的统计特征,研究人员使用了一个装置,该装置可以在固定泄漏尺寸和压力水平控制的情况下,对静水中管道中的流体泄漏进行物理建模。利用热管道中流体流动产生的噪声作为干扰。利用真实信号的统计特性,确定了累积泄漏检测系统的特性——泄漏信号衰减;检测到泄漏的传感器之间的最大距离;检测器灵敏度;研究了带通滤波对这些特性的影响。关键词:声接触检漏,液体检漏仪,噪声信号,累积量分析
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the characteristics of а cumulant system for liquid leakage detection in pipelines
Acoustic noise signals that are generated by fluid leakage due to a leak in the pipeline have in general case non-Gaussian distribution, so for the further development of acoustic contact leak detection together with correlation-spectral methods it is advisable to use methods used for probabilistic analysis of non-Gaussian processes, in particular cumulant methods of noise diagnostics. The principle of cumulant method of liquid leakage detection in pipelines during operation is considered, which is based on the use of cumulants to distinguish acoustic noise signals registered at the control points of the pipeline section, namely on use of the distance between the cumulant vectors of signals and the mutual correlation function of signals. The block diagram of the cumulant system for liquid leakage detection is given. In order to use the cumulant leakage detection system for power plant diagnosis, a layout of the acoustic leak detection system has been developed, which is a hardware-software complex that performs the collection, registration and statistical processing of acoustic noise signals, as a result of which a decision is made on the presence or absence of leakage, the parameters of the hardware part of the system were given. To obtain estimates of the statistical characteristics of real leakage signals, an installation was used that allows to perform physical modeling of fluid leakage in a pipeline in standing water under sustainable conditions, with fixed leak dimensions and pressure level control. Acoustic noise generated by the flow of fluid moving in the heat pipeline is used as interference. Using the statistical characteristics of real signals, the characteristics of the cumulant leakage detection system were determined – leakage signal attenuation; the maximum distance between the transducers at which the leakage is detected; detector sensitivity; the influence of bandpass filtering on these characteristics is investigated. Keywords: acoustic contact leak detection, liquid leakage detector, acoustic noise signals, cumulant analysis
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