Harmonic wavelet packet transform for on-line system health diagnosis

Author(s):  
Ruqiang Yan ◽  
Robert X. Gao
2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Pengfei Xing ◽  
Guobin Li ◽  
Ting Liu ◽  
Hongtao Gao ◽  
Guoyou Wang

Running-in wear experiments were conducted on a spherical-on-disk tester. The vibration signals collected in the experiments were detected by a combination of harmonic wavelet packet transform (HWPT) and cross-correlation analysis (CCA) methods. Experimental results show that the friction vibration signals detected in tangential and normal directions have the characteristics of no time delay and strong correlation. Their root-mean-square (RMS) values gradually reduce and enter a steady-state of fluctuation with the experiments time, which are consistent with the variation of friction coefficient and reflect the change of wear states from the running-in wear to the stable wear. Therefore, the detection of friction vibration can be realized by a combination of HWPT and CCA methods.


2006 ◽  
Vol 27 (12) ◽  
pp. 1255-1267 ◽  
Author(s):  
Gang Wang ◽  
Zhiguo Yan ◽  
Xiao Hu ◽  
Hongbo Xie ◽  
Zhizhong Wang

2014 ◽  
Vol 875-877 ◽  
pp. 2107-2112
Author(s):  
Ye Hua Huang ◽  
Guo Hua Dai

In order to determine the vibration characteristics of the reciprocating compressor on the offshore platform, the vibration signal from the reciprocating compressor on the offshore platform was investigated by applying the harmonic wavelet packet transform. The energy variation of vibration signal under the different frequencies was discussed. It was shown that the vibration energy of the reciprocating compressor in the horizontal and vertical directions is mainly concentrated in the low frequency of 25Hz and 50Hz, and the vibration energy of other frequency is small and smooth. In the axial direction, the vibration energy of the reciprocating compressor extends to the medium-high frequency, and the large energy appears in the 225 Hz. Therefore, the harmonic wavelet packet transform can be used to research the vibration characteristics of the reciprocating compressor on the offshore platform.


2017 ◽  
Vol 229 (3) ◽  
pp. 1275-1295 ◽  
Author(s):  
N. Jamia ◽  
P. Rajendran ◽  
S. El-Borgi ◽  
M. I. Friswell

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