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High pressure gear pump fault diagnosis method of wavelet packet
| Author : Xiong Date : 8/12/2014 9:49:57 PM |
High pressure gear pump fault diagnosis method of wavelet packet
In the form of state monitoring signal sequence
On-line condition monitoring and fault diagnosis system, general for the state signal acquisition is continuous, the resulting state of discrete signal sequence is theoretically infinite.Corresponding to the ground, in order to realize the online fault diagnosis, shorten the diagnostic time, hope the observation signal sequence length is limited.At the same time, pay attention to the wavelet packet is finite length signal sequence is decomposed into several corresponding in different frequency bands of wavelet packets, thus monitoring within the specific frequency band frequency characteristics to describe the health status of equipment.In the spectrum of the decomposed signal to extract reliable state information, wavelet signals in each band should have enough length.
For a specific application of fault diagnosis, should be based on all the characteristics of equipment system frequency range of frequency sampling period of the state information and the level of the wavelet packet decomposition.Appropriate decomposition level should be able to effectively eliminate the effects of low frequency and high frequency noise, in order to enhance sensitivity characteristic information of the wavelet packet analysis [27].Wavelet packet decomposition will signal sequence is decomposed into two frequency band signal, the width of the spectrum as the sampling frequency is divided by 2 MLM as decomposition layers).Therefore, the length of the signal sequence should be able to make the deepest of the length of the wavelet coefficients was 20 ~ 100.
The above: Guide pressure tube failure
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Pressure switch
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