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Audio based rotating machinery vane frequency intelligent test method

A technology of rotating machinery and testing methods, which is applied to the testing of machines/structural components, vibration testing, generation of ultrasonic/sonic/infrasonic waves, etc. It can solve the problems of time-consuming, low precision, and manual judgment of resonance methods, and achieve low cost , high precision, and the effect of suppressing leakage

Inactive Publication Date: 2009-11-04
SOUTHEAST UNIV
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Problems solved by technology

In actual use, the resonance method is time-consuming and requires a lot of instruments. Whether the blade is in a resonance state requires manual judgment, and the accuracy is not high.

Method used

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  • Audio based rotating machinery vane frequency intelligent test method
  • Audio based rotating machinery vane frequency intelligent test method

Examples

Experimental program
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Effect test

Embodiment

[0047] (1) Connection: Connect the vibration sensor and attenuator in turn, and enter the computer through the microphone interface.

[0048] (2) Initial setting: Turn on the frequency measurement system, and set the sampling frequency, sampling digits, sampling points, band-pass filtering range of the digital filter, trigger value and trigger sampling points of the sound card on the operation interface.

[0049] ① The sampling frequency is generally 4-10 times the frequency of the measured blade or structural component. Usually the frequency of the component to be tested is estimated in advance, and then it is judged based on the result whether the sampling frequency needs to be reset to ensure that it meets the requirements of signal processing. The default value is 2048Hz.

[0050] ②The number of sampling digits generally selects the default 16 digits, which can ensure the accuracy of sampling.

[0051] ③ The number of sampling points is related to the sampling frequency....

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Abstract

The intelligent test method of frequency of rotating machinery blades based on sound card is mainly used to test the natural frequencies of rotating machinery blades, and can also be used to test the natural frequencies of other structural components. The main application fields include: power, petrochemical, metallurgy, aviation, etc. , can measure the natural frequency of rotating machinery blades accurately, conveniently and at low cost. The test method is: 1.) Apply impact force to the blade; 2.) Pick up vibration signal by vibration sensor; 3.) Signal attenuator; 4.) Set the sampling parameters of sound card; 5.) Digital filter; 6.) Automatic test 7.) Automatic frequency measurement; 8.) Manual frequency measurement; 9.) Perform spectrum analysis on the selected signal; 10.) Determine frequency; 11.) Determine frequency automatically; 12.) Determine frequency manually. Through the above steps, the frequency of the measured blade or structural component can be obtained.

Description

technical field [0001] The invention is mainly used for testing the natural frequency of rotating machine blades, and can also be applied to test the natural frequencies of other structural components. The main application areas include: power, petrochemical, metallurgy, aviation, etc. Background technique [0002] Analysis of traditional test methods: Most of the blade frequency measurements use the hammering method and the resonance method. The hammering method refers to the use of a hammer to hit the blade, and the frequency spectrum of the free vibration response signal of the blade is analyzed to identify the frequency of the blade. The resonance method refers to applying an exciting force with an adjustable frequency to the blade, and measuring its natural frequency according to the frequency of the exciting force when the blade resonates. In actual use, the resonance method is time-consuming and requires a lot of instruments. Whether the blade is in a resonance stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/34G01N29/14G01M7/02
Inventor 张磊杨建刚
Owner SOUTHEAST UNIV
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