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De-noising preprocessing technology based on pre-whitening method

A technology of preprocessing and noise reduction, applied in the field of signal processing, can solve the problems of large loss of original signal and affect the effect of noise reduction, and achieve the effect of simple method, easy to understand, and good development prospects.

Inactive Publication Date: 2018-01-09
ZHEJIANG SHANGFENG SPECIAL BLOWER IND CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Most of the current preprocessing technologies improve the signal-to-noise ratio by filtering, but when the signal-to-noise ratio is small enough, or the desired signal and the noise signal cannot be distinguished in the frequency domain, the loss of the original signal by the filtering method will be Relatively large, thus affecting the effect of noise reduction

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  • De-noising preprocessing technology based on pre-whitening method
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  • De-noising preprocessing technology based on pre-whitening method

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Embodiment Construction

[0022] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] see Figure 1 to Figure 4 , the noise reduction preprocessing technology based on the pre-whitening method in this embodiment includes the following steps:

[0024] S01 uses an acceleration sensor to collect fan vibration signals with high SNR and low SNR respectively, and the fan signal with high SNR is the reference signal.

[0025] SO2 In the processing program, set the appropriate window length and overlap rate, and perform short-time Fourier transform on the vibration signal with low signal-to-noise ratio to obtain a three-dimensional image of time-frequency-amplitude.

[0026] S03 Perform pre-whitening operation on the above-mentioned three-dimensional stereoscopic image. In MATLAB, first obtain the covariance matrix of the above-mentioned m...

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Abstract

The invention discloses a de-noising preprocessing technology based on a pre-whitening method. Noise distributed at a certain band is distributed to each band via pre-whitening of a three-dimensionalsignal image, and particularly in the presence of small signal-to-noise ratio and many peaks on a frequency domain, the bands of required signals are distinguished from those of noise signals, thus providing a more convenient and multi-component thought for subsequent de-noising. Therefore, vibrating signals are effectively separated from noise signals, the original characteristics of the requiredsignals are furthest recovered after de-noising, and the reliability of signal monitoring and fault analysis and diagnosis is improved.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a processing method under the condition that the signal-to-noise ratio is so small that the required signal and the noise signal cannot be distinguished in the frequency domain. Background technique [0002] It is an important means to monitor fan faults to detect fan signals through signal means to judge fan operating status, so the reliability of fan original vibration signal directly affects the detection of fan operating status. [0003] The purpose of signal preprocessing is to improve the reliability of the information contained in the signal and the accuracy of data analysis, so as to improve the reliability and sensitivity of signal monitoring and fault diagnosis. Most of the current preprocessing technologies improve the signal-to-noise ratio by filtering, but when the signal-to-noise ratio is small enough, or the desired signal and the noise signal cannot be...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T5/00
Inventor 蒋洪涛初宁吴大转徐建锋邵准远胡伟锋宁岳
Owner ZHEJIANG SHANGFENG SPECIAL BLOWER IND CO LTD