Research on valve internal leakage monitoring based on single acoustic sensor

被引：0
|
作者：
Wang W. [1 ]
Wang F. [1 ]
Wu S. [1 ]
Lin W. [1 ]
机构：
[1] College of Information Science and Technology, Beijing University of Chemical Technology, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷
关键词：
Acoustic monitoring; Non-intrusive; Single-sensor structure; Valve internal leakage; Virtual valve;
D O I：
10.11949/j.issn.0438-1157.20190007
中图分类号：
学科分类号：
摘要：
Aiming at simulation and monitoring for valve internal leakage, a single-senor based non-intrusive acoustic monitoring method for valve internal leakage and a valve internal leakage simulation method are proposed. A virtual valve composed of a flange, thin paper sheet and perforated aluminum sheet is designed, which can truly simulate the transient leakage of a valve and overcome shortcomings in traditional valve internal leakage simulation method. By analyzing and comparing the frequency domain characteristics of the output signal of the upstream and downstream acoustic sensors under different conditions, the redundancy of the upstream acoustic sensor and the feasibility of single-sensor based acoustic monitoring method for valve internal leakage are verified. The time-frequency domain characteristics of the output signal of single acoustic sensor under different conditions are analyzed and compared, a time-frequency domain feature extraction method for acoustic signals based on wavelet packet energy fractionation and the kurtosis coefficient is proposed, the valve internal leakage diagnosis model based on support vector data description method (SVDD) was established with the normal samples under valve closed condition. The experimental results show that the proposed method for valve internal leakage monitoring with single acoustic sensor is effective, and it has strong anti-interference ability and high detection sensitivity. © All Right Reserved.
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页码：248 / 256
页数：8
相关论文
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