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An acoustic emission crack monitoring method and system

A technology of acoustic emission and acoustic emission sensor, which is applied in the direction of using acoustic emission technology for material analysis, processing detection response signals, etc., and can solve problems such as no effective and feasible methods

Active Publication Date: 2021-11-16
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

Therefore, there is no effective and feasible method for wheel disc fatigue crack monitoring in China.

Method used

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  • An acoustic emission crack monitoring method and system
  • An acoustic emission crack monitoring method and system
  • An acoustic emission crack monitoring method and system

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Embodiment Construction

[0035] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0036] Almost all materials produce acoustic emission signals during deformation and fracture, and the acoustic emission signals are the source information of the fatigue cracks of the wheel disk. Therefore, based on the principle of acoustic emission, the online acoustic emission monitoring research on the low cycle fatigue cracks of the wheel disk is proposed. Wheel disc fatigue is a process in which dislocations, slips, and microscopic cracks develop into macroscopic cracks in the wheel disc material. When dislocations, slips, and microscopic cracks are generated, stress waves are generated at the same time, and the stress waves become more and more severe as the cracks grow. Strong, the acoustic emission sensor is used to pick up the stress wave signal and analyze and process it.

[0037] Acoustic emission detection technology can capture the occurrence and ...

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Abstract

The invention relates to an acoustic emission crack monitoring method and system. The steps are as follows: 1) when the roulette works under low-cycle fatigue test conditions, the acoustic emission sensor is installed on the roulette fatigue tester; 2) the electric signal passes through the preamplifier After the impedance change, denoising, and amplification of the signal acquisition module, it is collected by the high-speed acquisition card of the signal acquisition module; 3) After the collected signal is processed by the noise reduction processing module, it passes through the crack acoustic emission model analysis cycle of the data processing and analysis module The abnormal change of crack acoustic emission characteristics during the process can be used to judge crack initiation. The system includes an acoustic emission sensor, a preamplifier, a signal acquisition module, a noise reduction processing module, and a data processing and analysis module. The invention can detect the initiation and expansion of low cycle fatigue cracks of the wheel disk.

Description

technical field [0001] The invention relates to the technical field of research on life determination of engine key parts, and relates to an online detection method and system for low-cycle fatigue cracks of aeroengine wheels and simulated wheels based on the principle of acoustic emission. Background technique [0002] The aero-engine wheel is a key component of the engine. Its working conditions are harsh, and it is affected by complex loads such as high engine speed, high temperature, and abnormal vibration. Failure problems often occur. The research on its life has always been a problem that needs to be solved urgently. The low-cycle fatigue test of the roulette is to detect the occurrence of cracks through regular inspection, but the regular inspection cannot detect the occurrence of cracks in time, and the life of the roulette cannot be accurately determined; cracks will cause the roulette to break and cause damage to the tester, affecting the normality of the test Car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14G01N29/44
CPCG01N29/14G01N29/44
Inventor 于洋杨平李赟郝丞
Owner SHENYANG POLYTECHNIC UNIV
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