摘要
为了实现对阀门泄漏故障更直观、准确的诊断,采用理论与试验相结合的方法,对工程实际中常见的阀门泄漏模式进行了归纳和分类,分析了典型泄漏模式下阀门漏孔处流场及能量计算方法;对具有不同泄漏模式的阀门泄漏状态进行了模拟试验研究,并对阀门泄漏声发射信号进行了小波包分析,获得不同泄漏模式下阀门泄漏产生的声发射信号能量的变化规律.结果表明:不同泄漏模式下阀门发生泄漏产生的声发射信号各子频率段能量比具有规律性差异;该诊断标准为阀门泄漏故障的可视化诊断奠定了一定的基础.
To realize visual and accurate diagnosis of valve leakage faults, the flow field around leakage holes and the energy calculation on fluid in the flow field were analyzed under typical leakage patterns, by integrating theory with practice and classifying common leakage patterns in engineering practice. Simulation experiments were carried out to study the valve leakage of different patterns, during which corresponding acoustic emission signals were analyzed using wavelet packet technology, and subsequently the variation laws of leakage acoustic emission energy with leakage pattern were obtained. Results show that the energy ratio in each sub-band of acoustic emission signals differs regularly for valve faults of different patterns. The diagnosis criteria may serve as a reference for visualized detection of valve faults.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第6期455-460,483,共7页
Journal of Chinese Society of Power Engineering
关键词
声发射技术
阀门
泄漏模式
小波包分析
能量谱
acoustic emission technology
valve
leakage pattern
wavelet packet analysis energy spec-trum
