Rotor rubbing acoustic emission signal denoising method

An acoustic emission signal and signal emission technology, which is applied in the direction of sound-emitting devices, measuring devices, instruments, etc., can solve the problems of not being able to reflect the rubbing state of rotating machinery, noise pollution of acoustic emission signals, etc., and achieve less multiplication and division operations and faster noise reduction fast, improve the effect of noise reduction effect

CN102063894BInactive Publication Date: 2012-05-30SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-05-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a rotor rubbing acoustic emission signal denoising method based on a conjugate gradient method and adaptive generalized morphological filtering. The invention puts forward a generalized morphological filter which utilizes the conjugate gradient method to realize the generalized morphological open and close of the filter and combines adaptive weighting on the basis of basicmorphological transformation and a combining form of the mathematical morphology, and the generalized morphological filter is applied to the denoising of a rubbing acoustic emission signal. The adaptive generalized morphological filter based on the conjugate gradient method, which is put forward by the invention, can be used for obtaining a better denoising effect on the rubbing acoustic emissionsignal and a higher signal-to-noise ratio compared with a traditional morphological filter.
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Description

technical field

[0001] The invention relates to an acoustic emission signal noise reduction method, in particular to a rotor rubbing acoustic emission signal noise reduction method based on a conjugate gradient method and an adaptive generalized morphological filter. Background technique

[0002] Rubbing between moving and static parts of rotating machinery due to factors such as unbalance, misalignment, and thermal bending during operation is a relatively common and typical fault. Acoustic Emission (AE) has become a method for rubbing fault detection of rotating machinery due to its high sensitivity and wide frequency response range. However, in actual engineering measurement, the acoustic emission signals collected on site are often polluted by various noises, especially the relatively harsh working environment of rotating machinery and the multi-source strong noise generated by the equipment itself during operation, so that the friction acoustic emission signals cannot re...

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0020] figure 1 It is an overall flowchart of the method for noise reduction of rotor rubbing acoustic emission signal based on conjugate gradient method and adaptive generalized morphological filtering. The steps of this method are as follows:

[0021] (1) Using the rubbing acoustic emission experimental device to obtain the noise-containing rubbing acoustic emission signal;

[0022] (2) Carry out generalized open-close and close-open filtering to the noise-containing rubbing acoustic emission signal obtained in step 1, and obtain the output signals of generalized open-close and close-open filters respectively;

[0023] (3) The initial weight coefficients of the generalized open-close and close-open filters are set to be 0.5, and the weight coefficients of the generalized open-close and close-open filters are adaptively transformed to optimal values ​​by using ...