Complete alternation synchronous sampling and analyzing method for rotating machinery vibration signals

A technology of rotating machinery and vibration signals, applied in the testing of machines/structural components, instruments, measuring devices, etc., can solve the problems of order ratio analysis error, inaccurate sampling data, asynchrony, etc., to save hardware, reduce costs, Reliable performance

Inactive Publication Date: 2013-08-07
STATE GRID CORP OF CHINA +2
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Problems solved by technology

This method is quite effective when the rotational speed of the rotating machine is constant or changes little, but when the rotational speed of the rotating machine changes greatly, the update frequency at this time is calculated from the frequency at the first sampling; therefore, when using this update frequency and Equiangular resampling of the speed pulses on the current high-speed shaft will cause the update frequency to be out of sync with the speed p

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  • Complete alternation synchronous sampling and analyzing method for rotating machinery vibration signals
  • Complete alternation synchronous sampling and analyzing method for rotating machinery vibration signals
  • Complete alternation synchronous sampling and analyzing method for rotating machinery vibration signals

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Embodiment Construction

[0033] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0034] refer to figure 1 As shown, the whole cycle synchronous sampling and analysis method of the rotating machinery vibration signal of the present invention includes:

[0035] Step 1: Continuously and synchronously collect the vibration signal and the key phase pulse signal at a fixed sampling frequency, and the key phase pulse signal is generated once every revolution of the rotating machine;

[0036] Step 2: According to the key-phase pulse signal, obtain the rotational speed and instantaneous frequency of the rotating machinery per revolution;

[0037] Step 3: Select a vibration order ratio M, and use the interpolation filter to interpolate the key-phase pulse signal by 2×vibration order ratio M times to obtain the average angle sample time series;

[0038] Step 4: Perform anti-aliasing digital filtering and interpolation resampli...

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Abstract

The invention discloses a complete alternation synchronous sampling and analyzing method for rotating machinery vibration signals. The complete alternation synchronous sampling and analyzing method includes that fixed sampling frequency collects vibration signals and key pulse signals continuously and synchronously, revolving speed and instantaneous frequency are acquired according to the key pulse signals, average-angle sample time series are acquired by interpolation filters, re-sampling is performed according to anti-aliasing digital filtering and interpolations to acquire vibration equal-angle sampling signals, and finally vibration order ratio spectra and harmonic wave forms of each order are finally acquired. By the synchronous sampling and analyzing method, accurate equal-angle sampling can be realized; and further, hardware is omitted, cost is reduced, and performance is reliable and stable.

Description

technical field [0001] The invention relates to a method for processing a vibration signal of a rotating machine, in particular to a method for synchronously sampling and analyzing the vibration signal of a rotating machine for the entire cycle. Background technique [0002] Vibration analysis is the most widely used method in fault diagnosis of rotating machinery. On the one hand, the vibration problem is one of the most important safety issues in the operation of rotating machinery. On the other hand, the vibration signal contains a wealth of information about the operating status of the machinery. When a rotating machine is running, its rotational speed fluctuates in a strict sense, especially during the speed up and down phases, and the vibration signals corresponding to these states are non-stationary signals. The analysis of these non-stationary vibration signals can reveal its frequency characteristics, especially the law of its frequency changing with time or speed, ...

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Application Information

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IPC IPC(8): G01H17/00G01M99/00
Inventor 刘晓锋卢修连秦惠敏卢承斌黄磊孙和泰
Owner STATE GRID CORP OF CHINA
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