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Acoustic testing method for inherent frequency of engine part

A natural frequency and acoustic testing technology, applied in the measurement of resonance frequency, measurement device, measurement of ultrasonic/sonic/infrasonic, etc.

Inactive Publication Date: 2012-07-04
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide an acoustic test method for the natural frequency of engine parts, to solve the problem of batch measurement by the vibration table resonance method and the hammer impact method of the contact sensor The natural frequency of the complex structural parts produced has complex fixtures, limited measurement range, and large error in measurement results.

Method used

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  • Acoustic testing method for inherent frequency of engine part
  • Acoustic testing method for inherent frequency of engine part
  • Acoustic testing method for inherent frequency of engine part

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Use the acoustic method to test the frequency of the high-pressure three-stage working blade of the engine, and fix the working blade A on the working platform with the clamp body and the gantry, and the structure of the clamp body is shown in image 3 , the structure of the gantry see Figure 4; Then, place the microphone MPA401 at a distance of 3cm to 5cm from the blade under test, use a small wooden hammer to vibrate the blade under test, collect the sound waves emitted by the part under test through the sound wave induction sensor, and convert the sound wave signal into a voltage signal through the sensor, and the voltage The signal is amplified by the preamplifier and then transmitted to the signal acquisition processor DH5920, and then the DHDAS signal test and analysis system software in the computer performs self-spectrum analysis on the acoustic digital signal transmitted by the signal acquisition processor to obtain the natural frequency of the working blade. ...

Embodiment 2

[0054] The engine rotor blades B, C, and D are randomly selected as test pieces, and the first three natural frequencies of the blades are tested. The specific test process is as follows. The rotor blades are fixed on the working platform with a clamp body and a gantry, and then the microphone is placed at a distance of At the 3cm~5cm of the measured blade, use a small wooden hammer to vibrate the measured blade, collect the sound wave emitted by the measured part through the acoustic wave induction sensor, convert the sound wave signal into a voltage signal through the sensor, and the voltage signal is amplified by the preamplifier and then transmitted to the The signal acquisition processor, and then through the DHDAS signal test and analysis system software in the computer, perform self-spectrum analysis on the acoustic digital signal transmitted from the signal acquisition processor to obtain the natural frequency of the working blade. The test results are shown in Table 3. ...

example 3

[0061] The natural frequency test of the blisk blade, due to the complex structure of the blisk, cannot be tested by the traditional method, and the advantages of the acoustic method can just meet the natural frequency test of the whole blade, so the acoustic method test of the blisk fills up this technology blank.

[0062] The principle of the test process is as follows: First, use a small wooden hammer to excite the tested component, and then use the acoustic wave induction sensor to collect the excited acoustic wave signal of the tested component, the acoustic signal is converted into a voltage signal by the sensor, and the voltage signal is passed through the front After the amplifier is amplified and adjusted, it is transmitted to the signal acquisition processor, and then the professional signal analysis software (DHDAS signal test analysis system software) in the computer performs self-spectrum analysis on the acoustic digital signal transmitted by the signal acquis...

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Abstract

The invention discloses an acoustic testing method for inherent frequency of an engine part. The method is characterized by comprising the following steps of: putting a tested part (1) on a working platform (3); and putting a sound wave induction sensor (4) at a distance of 3 to 5 centimeters away from the tested part (1), exciting the tested part (1) by using a small wooden hammer, acquiring sound wave produced by the tested part by using the sound wave induction sensor (4), making the sound wave sequentially pass through a preamplifier (5) and a signal acquisition and processing device (6), and outputting the frequency of each order of the tested part by a computer (7). The method has the advantages of simplicity in operation, no damage to the part, broad testing band and accurate testing result.

Description

technical field [0001] The invention relates to the field of component frequency testing, and in particular provides an acoustic testing method for the natural frequency of engine components. Background technique [0002] There are mainly two static frequency test methods for aero-engine components, one is the vibration table resonance method, and the other is the hammer impact method of the contact sensor. [0003] Vibrating table resonance frequency measurement method is to force the parts to vibrate under the action of the exciting force with adjustable frequency. When the frequency of the exciting force is equal to its natural frequency, the amplitude will increase sharply, and the parts will enter the resonance state at this time. The vibration frequency of the part measured in the resonance state is its natural frequency. The electromagnetic vibrating table is a complete set of equipment, generally composed of two parts: the vibrating table body and the control consol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H13/00
Inventor 刘伟万利王国鹏范秀杰王增玉
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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