Research on valve internal leakage monitoring based on single acoustic sensor

Wenliang WANG; Fang WANG; Shi en WU; Weiguo LIN

doi:10.11949/j.issn.0438-1157.20190007

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Research on valve internal leakage monitoring based on single acoustic sensor

更新时间：2020-06-24

- Research on valve internal leakage monitoring based on single acoustic sensor
- CIESC Journal Issue S1, Pages: 248-256(2019)
- 作者机构：
  
  北京化工大学信息科学与技术学院，北京100029
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20190007
  CLC： TE 988
- Received：03 January 2019，
  
  Revised：2019-02-20，
- 稿件说明：
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王文亮, 王芳, 吴石恩, 林伟国. 阀门内漏单声波传感器监测方法研究[J]. 化工学报, 2019, 70(S1): 248-256

WANG Wenliang, WANG Fang, WU Shi’en, LIN Weiguo. Research on valve internal leakage monitoring based on single acoustic sensor[J]. CIESC Journal, 2019, 70(S1): 248-256
王文亮, 王芳, 吴石恩, 林伟国. 阀门内漏单声波传感器监测方法研究[J]. 化工学报, 2019, 70(S1): 248-256 DOI： 10.11949/j.issn.0438-1157.20190007.

WANG Wenliang, WANG Fang, WU Shi’en, LIN Weiguo. Research on valve internal leakage monitoring based on single acoustic sensor[J]. CIESC Journal, 2019, 70(S1): 248-256 DOI： 10.11949/j.issn.0438-1157.20190007.

摘要

针对阀门内漏模拟和阀门内漏监测问题，提出了阀门内漏模拟和阀门内漏非介入式单声波传感器监测方法。设计了由法兰、薄纸片和带孔铝片组成的虚拟阀门，可真实地模拟阀门内漏瞬态过程，克服了传统阀门内漏模拟方法中存在的各种缺点。分析、比较了不同条件下阀门上下游声波传感器输出信号的频域特征，验证了阀门上游声波传感器设置的冗余性和基于单声波传感器实现阀门内漏监测的可行性。分析、比较了不同条件下单声波传感器输出信号的时频域特征，提出了基于峰值系数和小波包能量分率的阀门内漏时频域特征提取方法，并以阀门密封良好状态下的声波信号为样本，建立了基于SVDD的阀门内漏诊断模型。测试结果表明：本文提出的单声波传感器阀门内漏监测方法可行、模型诊断准确，且具有较强的抗干扰能力和较高的阀门内漏检测灵敏度。

Abstract

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.

关键词

Keywords

references

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