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Vol. 172, Issue 6, June 2014, pp. 139-146




Mechanical Seal Opening Condition Monitoring Based on Acoustic Emission Technology

1 Erqing Zhang,1 Pan Fu,1 Zhendi Ge, 2 Zhi Zhang,2 Junkai Zhang

1 School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China
2 Department of Science and Technology, Sichuan Sunny Seal Co., LTD, Chengdu, 610045, China
1 Tel.: 13880911913

E-mail: zrq@my.swjtu.edu.cn


Received: 9 April 2014 /Accepted: 30 May 2014 /Published: 30 June 2014

Digital Sensors and Sensor Sysstems


Abstract: Since the measurement of mechanical sealing film thickness and just-lift-off time is very difficult, the sealing film condition monitoring method based on acoustic emission signal is proposed. The mechanical seal acoustic emission signal present obvious characteristics of time-varying nonlinear and pulsating. In this paper, the acoustic emission signal is used to monitor the seal end faces just-lift-off time and friction condition. The acoustic emission signal is decomposed by empirical mode decomposition into a series of intrinsic mode function with independent characteristics of different time scales and different frequency band. The acoustic emission signal only generated by end faces friction is obtained by eliminating the false intrinsic mode function components. The correlation coefficient of acoustic emission signal and Multi-scale Laplace Wavelet is calculated. It is proved that the maximum frequency (8000 Hz) of the correlation coefficient is appeared at the spindle speed of 300 rpm. And at this time (300 rpm) the end faces have just lifted off. By a set of mechanical oil seal running test, it is demonstrated that this method could accurately identify mechanical seal end faces just-lift-off time and friction condition.


Keywords: Mechanical seal, Acoustic emission, EMD, Multi-scale Laplace wavelet, Condition monitoring.


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