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Blade scraping monitoring method and monitoring system

A monitoring system and blade technology, which is applied in the direction of measuring devices, engine testing, mechanical parts testing, etc., can solve problems such as wear and tear that cannot be detected, and achieve the effect of increasing safety

Active Publication Date: 2022-03-11
AECC COMML AIRCRAFT ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing blade tip clearance monitoring system can measure the distance between the probe and the blade tip, and measure the wear depth of the abradable layer at the measuring point, but this system can only measure the wear at the measuring point, and cannot detect the wear at other positions

Method used

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  • Blade scraping monitoring method and monitoring system
  • Blade scraping monitoring method and monitoring system
  • Blade scraping monitoring method and monitoring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 2 As shown, the present invention provides a blade scraping monitoring method, comprising the following steps:

[0052] S11, setting a test point on the outer surface of the casing 1, and obtaining the amplitude and time domain signal of the real-time vibration of the test point;

[0053] S12. Processing the amplitude time domain signal, and converting the amplitude time domain signal into an amplitude frequency domain signal;

[0054] S13. Let the root mean square value or the mean value of the amplitude of the amplitude frequency domain signal be a statistical value, and obtain a ratio of the statistical value to a preset threshold;

[0055] S14. If the ratio is <1, there is no scraping between the blade 2 and the casing 1;

[0056] S15 , if the ratio ≥ 1, scraping occurs between the blade 2 and the casing 1 .

[0057] In order to monitor the scraping degree more accurately, it is better to make the position of the test point correspond to the abrad...

Embodiment 2

[0064] Such as Figure 6 As shown, the present invention provides a blade scraping monitoring method, comprising the following steps:

[0065] S21. Set a test point on the outer surface of the casing 1, and obtain an amplitude time-domain signal of the real-time vibration of the test point;

[0066] S22. Process the amplitude time domain signal, and convert the amplitude time domain signal into an amplitude frequency domain signal;

[0067] S23. Let the root mean square value or the mean value of the amplitude of the amplitude frequency domain signal be a statistical value, and obtain a ratio of the statistical value to a preset threshold;

[0068] S24. If the ratio is less than 1, there is no scraping between the blade 2 and the casing 1, and step S21 is continued;

[0069] S25. If the ratio is greater than or equal to 1, scraping occurs between the blade 2 and the casing 1, and step S26 is executed;

[0070] S26 , judging the severity of scraping according to the ratio, t...

Embodiment 3

[0073] The preset threshold value of the blade scraping monitoring method in Embodiment 1 and Embodiment 2 corresponds to each test point, that is, each test point has a corresponding threshold value.

[0074] Among them, such as Figure 7 As shown, the threshold setting method includes:

[0075] S31, running the engine to a speed at which scraping is unlikely to occur;

[0076] S32. Setting test points on the outer surface of the casing, and obtaining real-time vibration amplitude and time-domain signals of the test points;

[0077] S33. Process the amplitude time domain signal, and convert the amplitude time domain signal into an amplitude frequency domain signal;

[0078] S34. Let the root mean square value or mean value of the amplitude of the amplitude frequency domain signal be the threshold.

[0079] The threshold value obtained in step S34 is the threshold value of the corresponding test point. Wherein, if during the comparison process, the statistical value is the...

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Abstract

The invention provides a blade scraping monitoring method and monitoring system, setting test points on the outer surface of the casing, and obtaining the amplitude time domain signal of the real-time vibration of the test point; processing the amplitude time domain signal , and convert the amplitude time domain signal into an amplitude frequency domain signal; make the root mean square value or mean value of the amplitude of the amplitude frequency domain signal a statistical value, and obtain the statistical value and the preset threshold If the ratio is <1, there is no scraping between the blade and the casing; if the ratio is ≥1, there is scraping between the blade and the casing. The blade scraping monitoring method and monitoring system can display the scraping monitoring signal in real time to determine whether a scraping event occurs between the blade and the abradable layer, and evaluate the degree of scraping according to the ratio of the statistical value and the threshold value during scraping, online monitoring The scraping of the abradable layer increases the safety of equipment operation.

Description

technical field [0001] The invention relates to a blade scraping monitoring method and a monitoring system. Background technique [0002] Rubbing between the rotor and the stator in rotating machinery is a frequent phenomenon, ranging from increased vibration to seriously affecting the life of the equipment, and even causing vicious accidents involving machine crashes and human deaths. [0003] Due to the complexity of rub rub fault mechanism and system response induced by rub rub, a lot of research has been done on rub rub fault. According to the current research status, single-point rubbing, partial rubbing, and full-circle rubbing are studied, and the typical fault characteristics of various rubbing forms are summarized and analyzed. However, for the abradable layer between the blade and the casing The research on scraping has not been reported yet. [0004] The existing blade tip clearance monitoring system can measure the distance between the probe and the blade tip, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/00G01M13/00
CPCG01M15/00G01M13/00
Inventor 万召马会防虞磊黄巍
Owner AECC COMML AIRCRAFT ENGINE CO LTD