An Unbalanced Signal Extraction Method Based on Variable Sampling Length Correlation Filtering

A technology of balanced signal and correlation filtering, which is applied in static/dynamic balance test, machine/structural component test, special data processing application, etc. Accurate, unable to distinguish near-frequency interference and other problems, to overcome the ability to resist near-frequency interference, shorten the phase accuracy, and eliminate the effects of near-frequency interference
CN104502022BInactive Publication Date: 2018-01-16HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2018-01-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an unbalanced signal extraction method based on variable sampling length correlation filtering to obtain the maximum interference frequency and unbalanced signal frequency: collecting vibration signals detected by a vibration sensor, digitally tracking and filtering the collected signals and then performing MUSIC The power spectrum estimation obtains the interference frequency with the largest amplitude, and the unbalanced signal frequency is measured by the speed sensor; determine the sampling length T: select a reasonable sampling length according to the distribution law of the interference degree, and judge whether the absolute value of the primary sampling length is unbalanced Integer multiple of the signal, if it is determined to be the sampling length, if not, take the sampling length as an integer multiple of the unbalanced signal period with the adjacent interference degree; band-pass filter the acquisition signal with the acquisition length T and use the correlation filtering method Extract the phase and amplitude of unbalanced signals. The amplitude and phase extraction errors of the new method proposed by the invention do not fluctuate with the signal-to-noise ratio and the frequency difference between the signal and the interference, which ensures the stability of the unbalanced signal extraction.
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Description

Technical field

[0001] The invention relates to an unbalanced signal extraction method, in particular to an unbalanced signal extraction method based on variable sampling length correlation filtering. Background technique

[0002] As the rotation speed of rotating machinery increases, the mechanical operation stability is strictly required. The stability of rotation can be measured by the phase and amplitude of the unbalanced signal. The balance is achieved by balancing the unbalanced quantity, that is, dynamic balancing technology. The principle of dynamic balance technology: When the motor drives the shaft to rotate, the vibration signal of the shaft is collected by the sensor installed on the support structure of the shaft, and the vibration signal is processed by noise elimination and filtering to obtain the unbalanced signal, and the phase sum of the unbalanced signal is calculated. Amplitude, by moving the counterweight and other compensation devices to the position of the ...

Claims

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