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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

Inactive Publication Date: 2018-01-16
HEFEI UNIV OF TECH
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Problems solved by technology

The FFT method has spectrum leakage in the case of limited data length, and it is difficult to suppress the influence of near-frequency interference on unbalanced signals.
Correlation filtering method and sinusoidal parameter estimation method have low frequency resolution and cannot distinguish near-frequency interference
The modern spectrum estimation method has high resolution and can accurately estimate the interference frequency under short data conditions, but the amplitude and phase estimation are inaccurate

Method used

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

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Embodiment Construction

[0025] With reference to the drawings, the present invention will be described in detail below:

[0026] Such as figure 1 , The signal processing system includes two parts, the hardware part and the software part. The hardware part performs anti-aliasing filtering of vibration signals, program-controlled gain adjustment, doubling frequency tracking sampling, pulse shaping of the speed signal, and doubling frequency tracking sampling; the software part first performs digital tracking and filtering of the sampling signal, and estimates the MUSIC power spectrum to obtain the near-frequency interference frequency, Calculate the sampling length, and then extract the unbalanced signal according to the sampling length multiplication frequency tracking sampling, digital tracking filtering, and correlation filtering, and calculate and output the amplitude and phase of the unbalanced signal.

[0027] The collected vibration signal is the sampling signal obtained by the original vibration sig...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/22G06F19/00
Inventor 张建军徐娟张利吕格格魏振春罗轶超
Owner HEFEI UNIV OF TECH
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