A non-intrusive acoustic monitoring method for valve internal leakage was proposed using a dual-sensor structure. The sensing device was designed to be able to adjust contact level between sensor and pipe wall and lock them, and it could be loaded and unloaded quickly. The time-frequency domain features of interference acoustic signals sampled under the conditions of valve normal state, valve internal leakage, pipe tapping, pump starting during valve being in open or close state were analyzed contrastively. The feature extraction approach based on the wavelet packet energy ratio for valve internal leakage acoustic signals was proposed. It was shown that this method can effectively distinguish valve internal leakage and external interferences; it has a higher leakage detection sensitivity, it can greatly reduce the sampling frequency and the difficulty degree of valve internal leakage diagnosis.
林伟国，吴石恩. 阀门内漏声波监测及其信号特征提取方法[J]. 振动与冲击, 2018, 37(9): 120-126.
LIN Wei-guo WU Shi-en. Acoustic monitoring and signal feature extraction for valve internal leakage. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(9): 120-126.
[1] Toles, G. E. Leak Detection by Mass Spectrometry. Can. Machinery and Metal Working, 1975,86(2),56.
[2] Leon R L, Heagerty D Q. Method and Apparatus for On-line Detection of Leaky Emergency Shut Down or Other Valves: U.S. Patent 6,128,946[P]. 2000-10-10.
[3] Juvik T, Hermansen T, Carr R, et al. Online Valve Monitoring Systems Used on off-shore Platforms in the North sea[C]//ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. American Society of Mechanical Engineers, 2002: 333-337.
[4] Le T T, Watton J, Pham D T. Fault Classification of Fluid Power Systems Using a Dynamics Feature Extraction Technique and Neural Networks[J]. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 1998, 212(2): 87-97.
[5] Webborn T J C. Thermography'-Making Heat Loss Visible[J]. Chartered Mechanical Engineer, 1984, 31: 45-7.
[6] Germain J L, Granal L, Provost D, et al. Inspection Systems for Valves Monitoring at EDF[R]. Electricite de France (EDF), 1997.
[7] Thompson G, Askari A R. Air Leak Detection Through Ball Plug Valves by Vibration Monitoring[J]. Noise & Vibration Control Worldwide, 1986, 17: 140-143.
[8] Thompson G, Zolkiewski G. An Experimental Investigation into the Detection of Internal Leakage of Gases through Valves by Vibration Analysis[J]. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 1997, 211(3): 195-207.
[9] Smith T R. Development and Use of an Effective Acoustic Valve Leak Detection System[C]//Proceedings of the American Power Conference. ILLINOIS INSTITUTE OF TECHNOLOGY, 1993, 55: 899-904.
[10] 王忠锋,黄剑龙,李力刚,等.基于无线通信的阀门泄漏检测系统[J]. 仪器仪表学报, 2009, 30(6).
Wang Zhongfeng, Huang Jianlong, Li Ligang, Wang Lehui. Valve Leakage Detection System Based on Wireless Communication[J]. Chinese Journal of Scientific Instrument, 2009, 30(6).
[11] 王超,凌志浩,林琦彬.无线阀门泄漏变送器的设计[J]. 仪器仪表学报,2010,31(8)增刊：75-79.
Wang Chao, Ling Zhihao, Lin Qinbin. Design of Wireless Valve Leakage Transmitter[J], Chinese Journal of Scientific Instrument, 2010,31(8) extra issue:75-79.
[12] Yan T, Theobald P, Jones B E. A Self-calibrating Piezoelectric Transducer with Integral Sensor for in Situ Energy Calibration of Acoustic Emission[J]. Ndt & E International, 2002, 35(7):459-464.
[13] Pollock A A, Hsu S Y S. Leak Detection Using Acoustic Emission[J]. Journal of Acoustic Emission, 1982, 1: 237-243.
[14] Sharif M A, Grosvenor R I. Internal Valve Leakage Detection Using an Acoustic Emission Measurement System[J]. Transactions of the Institute of Measurement and Control, 1998, 20(5): 233-242.
[15] Lee J H, Lee M R, Kim J T, et al. A Study of The Characteristics of the Acoustic Emission Signals for Condition Monitoring of Check Valves in Nuclear Power Plants[J]. Nuclear engineering and design, 2006, 236(13): 1411-1421.
[16] 叶子, 王超. 用于监测阀门泄漏的超高动态范围全光纤超声传感系统[J]. 传感技术学报, 2016(7).
Ye Zi, Wang Chao. A High Dynamic Range AllFiber UltraAcoustic PressureSensing System for Detection of Valve Leakage[J]. Chinese Journal of Sensors and Actuators,2016(7).
[17] 刘贵杰, 徐萌, 王欣,等. 基于HHT的管道阀门内漏声发射检测研究[J]. 振动与冲击, 2012, 31(23):62-66.
Liu Guijie, Xu Meng, Wang Xin, Jiang Ruilin. AE Detection for Pipeline Valve Leakage Based on HHT[J]. Journal of Vibration and Shock, 2012, 31(23):62-66.
[18] 李振林, 张海峰, 夏广辉. 基于声发射理论的阀门气体内漏量化检测研究[J]. 振动与冲击, 2013, 32(15):77-81.
Li Zhenlin, Zhang Haifeng, Xia Guanghui. Quantitative Detection of Valve Internal Air Leakage Based on Acoustic Emission Theory[J] . Journal of Vibration and Shock, 2013,32(15):77-8.
