A Method to Distinguish True and False Beat Vibrations

A technology of true and false, vibration wave, applied in instruments, measuring devices, measuring ultrasonic/sonic wave/infrasonic wave, etc., can solve the problem of not beating vibration waves, etc., and achieve the effect of simple steps and strong operability

Active Publication Date: 2019-04-02
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Abstract
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Problems solved by technology

These two waveforms are relatively close to the waveform of the beat vibration wave, but neither of them is a real beat vibration wave.

Method used

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  • A Method to Distinguish True and False Beat Vibrations
  • A Method to Distinguish True and False Beat Vibrations
  • A Method to Distinguish True and False Beat Vibrations

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Based on the understanding of the essential characteristics of the beating vibration phenomenon, the present invention determines the real beating vibration wave according to the different characteristics of the beating vibration wave and the two false beating vibration waves, and proposes an analysis method combining waveform and frequency spectrum analysis to distinguish between true and false beat vibration, which is based on:

[0023] 1) In the pressure pulsation (or vibration) signal, its waveform is similar to the real beating vibration waveform, which is essentially a carrier phenomenon composed of high-frequency pressure pulsation and low-frequency pressure pulsation; for example, Figure 9 , Figure 10 The pressure pulsation signal shown, its waveform and figure 1 The real beat vibration shown is very similar. Using FFT to analyze th...

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Abstract

The invention relates to a method for distinguishing true and false beat vibration. The method comprises the following steps that 1, substantive characteristics used for distinguishing beat vibration waves are determined; 2, spectral analysis is conducted on waveform signals of suspected beat vibration waves, and the frequency and the amplitude value of the waveform are determined; 3, comparison and identification are conducted through the substantive characteristics of the beat vibration waves in the step 1 according to a spectral analysis result and the time domain waveform thereof through the following identification steps that if the waveform only has one frequency high point, the waveform is not the beat vibration waves, otherwise, the next step is conducted, if the waveform has more than two frequency high points or high point groups, the next step is conducted, and otherwise, the waveform is not the beat vibration waves; 4, difference values delta f of the frequencies of adjacent high points or high point groups are sequentially calculated, if one delta f is approximately equal to 1 / Tb, the waveform is the beat vibration waves, the frequency fb of the beat vibration waves is delta f, and otherwise, if delta f is not equal to 1 / Tb, the waveform is not the beat vibration waves. According to the method, the true and false beat vibration waves can be distinguished, and more symptomatic stable running measures are made.

Description

technical field [0001] The invention relates to a method for distinguishing true and false beating vibrations, in particular to a method for distinguishing true and false beating vibrations used in the field of vibration or pressure pulsation. Background technique [0002] At present, in the operation of hydropower stations, water pumping stations and various types of rotating machinery, various unstable phenomena such as vibration and pressure pulsation may often be encountered, and beating vibration is one of them. [0003] like figure 1 , figure 2 As shown, when two disturbance frequencies f 1 , f 2 (f 1 <f 2 ) are relatively close, and the two vibration amplitudes are not much different or equal, such as image 3 The beating phenomenon shown, and obtained as Figure 4 The spectrum of the beat vibration shown, the beat frequency f b (Beat frequency for short, that is, beat vibration period T b The reciprocal of ) is the difference between the two disturbance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 徐洪泉廖翠林高忠信李铁友王万鹏陆力马素萍王武昌赵立策穆恩良范小付
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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