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Novel transient oscillation signal angular domain order tracking sampling and analytical method

A transient vibration and order tracking technology, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as error in analysis results, complex circuit design, order tracking error, etc., to achieve clear spectral lines, Strong real-time and high-precision effects

Inactive Publication Date: 2013-09-04
HEFEI VIBTECH MEASUREMENT & CONTROL SCI & TECH
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Problems solved by technology

The traditional order tracking method is implemented based on hardware, and requires phase-locked loops, frequency multiplication circuits, and anti-aliasing filters with real-time adjustable cut-off frequencies. When the rate is high, there will be a large error in order ratio tracking, resulting in wrong analysis results

Method used

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  • Novel transient oscillation signal angular domain order tracking sampling and analytical method
  • Novel transient oscillation signal angular domain order tracking sampling and analytical method
  • Novel transient oscillation signal angular domain order tracking sampling and analytical method

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Embodiment 1

[0069] With the original sampling frequency sf as 128Hz, a rotating mechanical vibration signal and a key phase pulse signal are simulated, and the frequency of the vibration signal increases linearly from 1Hz to 10Hz, such as figure 2 As shown (the total signal length is 8 seconds, that is, 1024 sample points, for the sake of a clearer picture, only the first 2 seconds of data are shown), the key phase pulse signal is a pulse for each rotation of the rotor, as shown in image 3 shown. Figure 4 For the frequency spectrum obtained when the vibration data is directly subjected to fast Fourier transform, it can be seen that the frequency spectrum overlaps with each other within 1-10 Hz, showing a continuous spectrum, which cannot correctly reflect the frequency spectrum characteristics of the signal.

[0070] Utilize the inventive method, set the threshold voltage of key-phase pulse as 0.42V, the key-phase pulse signal rising edge time that obtains by threshold value detection ...

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Abstract

The invention discloses a novel transient oscillation signal angular domain order tracking sampling and analytical method. The method comprises the following steps that fixed sample frequency is utilized, rotating mechanical vibration signals and key phase pulse signals are synchronously collected, rotating speed key phase pulses are identified, an angular domain sampling sample time sequence is calculated, original signals are sampled, digital signals are sampled again, and the angular signals are processed. The novel transient oscillation signal angular domain order tracking sampling and analytical method has the advantages of being high in accuracy and real-time performance, clear in spectral lines, and high in self-adaptability and robustness.

Description

technical field [0001] The invention relates to a novel tracking sampling and analysis method of angular domain order ratio of transient vibration signal. Background technique [0002] Discrete Fourier Transform (DFT) and its fast algorithm FFT are an effective steady-state vibration signal processing and analysis method, but for non-stationary transient vibration signals, such as vibration signals in the speed-up and down-speed phase of rotating machinery, FFT is directly used It will cause the frequency to be ambiguous, and accurate spectrum information cannot be obtained. [0003] Order tracking is an effective method to solve unsteady vibration signals, and the key lies in how to accurately realize equal-angle sampling of vibration signals. The traditional order tracking method is implemented based on hardware, and requires phase-locked loops, frequency multiplication circuits, and anti-aliasing filters with real-time adjustable cut-off frequencies. When the rate is hi...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 杨金赞傅雷扬
Owner HEFEI VIBTECH MEASUREMENT & CONTROL SCI & TECH
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