A Synchronous Order Tracking Analysis Method for Vibration Signals of Rotating Machinery

Abstract

The invention relates to a method achieving rotary machinery vibration signal synchronization order ratio tracing analysis. The method achieving the rotary machinery vibration signal synchronization order ratio tracing analysis comprises the following steps: adopting a fixing sampling frequency to synchronously collect a rotary machinery vibration signal and a rotary speed key phase pulse signal, selecting a vibration phase ratio number M, utilizing an interpolation filter to carry out 2*M-time interpolation on the key phase pulse, obtaining the time sequence of equal angle signal samples, then carrying out lowpass filtering and interpolation resampling on the vibration signals, obtaining an equal angle vibration sampling signal, processing the equal angle vibration sampling signal, and finally obtaining a vibration phase ratio spectrum and each phase harmonic wave form. The method achieving the rotary machinery vibration signal synchronization order ratio tracing analysis achieves accurate equal angle sampling, and does not have disorder of frequency, namely, when a rotary shaft rotates for one time, a differential seat angle corresponding with the rotary shaft of a sampling point is identical, the positions of the sampling points on the rotary shaft are fixed, and therefore an accurate complete alternation synchronous sampling is achieved. The method achieving the rotary machinery vibration signal synchronization order ratio tracing analysis overcomes the defects that collected wave-form data are interval and discontinuous due to the fact that a sampling frequency needs to be adjusted continuously during a hardware mode, and is capable of achieving continuous and ceaseless collection of wave forms.

Description

technical field [0001] The invention relates to the field of mechanical vibration analysis and measurement, in particular to a method for realizing synchronous order tracking analysis of vibration signals of rotating machinery. Background technique [0002] The traditional vibration order tracking method of rotating machinery is realized by hardware, which requires a phase-locked loop, a frequency multiplication and frequency division circuit, and an anti-aliasing tracking filter with a real-time adjustable cut-off frequency, etc. The circuit is complex and the cost is high. , especially in equiangular resampling has been studied intensively. The main problems of the hardware implementation method are: 1) The sampling frequency needs to be pre-estimated by the last rotation speed of the rotating machinery, and there are errors in the estimation, so it is impossible to achieve accurate synchronous sampling of the entire cycle, resulting in spectral leakage of the FFT results;...

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Problems solved by technology

[0002] The traditional vibration order tracking method of rotating machinery is realized by hardware, which requires a phase-locked loop, a frequency multiplication and frequency division circuit, and an anti-aliasing tracking filter with a real-time adjustable cut-off frequency, etc. The circuit is complex and the cost is high. , especially the equiangular resampling has been studied with focus on

The main problems of the hardware implementation method are: 1) The sampling frequency needs to be pre-estimated by the last rotation speed of the rotating machinery, and there are errors in the estimation, so it is impossible to achieve accurate synchronous sampling of the entire cycle, resulting in spectral leakage of the FFT results; 2) The hardware method The required anti-aliasing filter with adjustable cut-off frequency has a complex structure. Since the sampling frequency needs to be adjusted continuously, the collected waveform data has intervals and discontinuous

This method is quite effective when the rotation speed of the rotating machinery is constant or changes little, but when the rotation speed changes greatly at any time, the update frequency at this time is calculated from the frequency at the first sampling; therefore, when using this update frequency and the current The speed pulse on the high-speed shaft is resampled at an equal angle, which will cause the update frequency to be out of sync with the speed pulse on the current high-speed shaft, and the sampling data will be inaccurate

Therefore, the traditional order ratio tracking method is used in variable speed machinery, especially when the speed up and down speed is high. Since the instantaneous frequency cannot be tracked, it can only be preset, and because the equal angle resampling is resampled by hardware, so , there will be a large error in the order ratio tracking

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