摘要
准确检测锅炉承压管线泄漏是保障锅炉安全运行的关键技术,音频分析法是检测承压管线泄漏故障的主要手段,提出一种基于联合时频分析(Joint Time-Frequency Analysis, JTFA)研究锅炉背景声和承压管线泄露声的时频特征,判定泄漏故障的方法。设计了由前置放大、程控滤波、增益补偿处理的双通道音频信号采集电路;采用快速傅里叶变换获取信号广义谱特征,采用程控滤波对采集信号加动态频率窗,再采用短时傅里叶变换对采集信号时间加窗,多角度分析信号的时频特征,以判定承压管线运行是否存在泄漏故障。相比于传统的RC滤波加快速傅里叶变换分析方法,这种动态加双窗的时频分析法能够提高泄漏信号采集的灵敏度和泄漏故障判定的准确性。
Accurate detection of pressure line leakage is the key to ensuring the safe operation of boiler, and the audio frequency analysis is the main detection method. A method based on joint time-frequency analysis(JTFA) is proposed to study the time-frequency characteristics of boiler background sound and pressure line leakage sound for leakage fault determination. A dual channel audio signal acquisition circuit composed of pre-amplification, program-controlled filtering and gain compensation is designed. Fast Fourier transform(FFT) is used to obtain the generalized spectrum characteristics of the signal, the program-controlled filter is used to set a dynamic frequency window for the acquisition signal, and the short-time Fourier transform(STFT) is used to set a time window for the acquisition signal. The time-frequency characteristics of the signal are analyzed from multiple perspectives to determine whether there is leakage fault in the operation of the pressure pipeline. Compared with the traditional RC filtering and fast Fourier transform analysis method, the time-frequency analysis method with dynamic double windows can improve the sensitivity of leakage signal acquisition and the accuracy of leakage fault determination.
作者
艾学忠
袁天奇
闫敏
杨叶礼
陈思宇
AI Xuezhong;YUAN Tianqi;YAN Min;YANG Yeli;CHEN Siyu(School of Information and Control Engineering,Jilin Institute of Chemical Technology,Jilin 132000,Jilin,China;Northeast Electric Power Research Institute Kaiyuan Technology Co.,Ltd.,Jilin 132000,Jilin,China)
出处
《声学技术》
CSCD
北大核心
2022年第2期282-287,共6页
Technical Acoustics
基金
吉林省科技发展计划资助项目(20190302063GX)。
关键词
时频分析
承压管线
泄漏故障
可编程滤波
time-frequency analysis
pressure pipeline
leakage fault
programmable filtering
