Nondestructive testing system and method for turbine disc by using bilinear array transducer

A transducer and bilinear technology, applied in the direction of processing detection response signals, etc., can solve the problems of low imaging resolution, low detection resolution, and affecting the performance of aeroengines

Active Publication Date: 2021-04-20
BEIHANG UNIV
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  • Claims
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Problems solved by technology

Aeronautical superalloy discs work under extreme conditions such as high speed, high load, high temperature, and high pressure for a long time. The weld zone is a stress concentration area. When defects occur, area defects such as micro-close gaps and microscopic distribution appear on the diffusion welding interface. Become a major safety hazard af

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  • Nondestructive testing system and method for turbine disc by using bilinear array transducer
  • Nondestructive testing system and method for turbine disc by using bilinear array transducer
  • Nondestructive testing system and method for turbine disc by using bilinear array transducer

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Embodiment Construction

[0052] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] In the present invention, the dual linear array transducer includes an array ultrasonic pocket board and an ultrasonic probe. Due to the large number of blades of the aviation superalloy disc (such as figure 2 As shown), one or more ultrasonic probes need to be arranged on each blade, and the number of interfaces of each array ultrasonic pocket board is fixed, so a branch line is connected between the array ultrasonic pocket board and the ultrasonic probe The array ultrasonic pocket board and the computer are connected with an ultrasonic excitation receiving board, such as image 3 shown. Ultrasound probes are one-dimensional linear probes with multiple element elements. see figure 2 As shown, if a pair of probes are arranged at the diffusion welding of the blade (that is, the transmitter probe is placed above the blade, and the r...

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Abstract

The invention discloses a nondestructive testing system and method for a turbine disc by using a bilinear array transducer. The detection system is used for processing an image formed by ultrasonic echo data acquired by the bilinear array transducer by using a computer in which a Space-Defect method is stored so as to obtain a defect-imaging point on a tested object. According to the method, the Space-Defect method is adopted to solve the problem that a conventional phased array is difficult to solve the characteristic of small defects smaller than half wavelength, the Space-Defect method can achieve high-precision automatic recognition and high-precision imaging of a test piece of a complex structure, and a new way is provided for detection of diffusion welding area type defects of the aviation high-temperature alloy disc.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, and more particularly refers to a non-destructive testing that can be performed on a turbine disk with a narrow gap. Background technique [0002] A transducer is an energy conversion device, and its performance description and evaluation require many parameters. The characteristic parameters of the transducer include resonance frequency, frequency bandwidth, electromechanical coupling coefficient, electroacoustic efficiency, mechanical quality factor, impedance characteristic, frequency characteristic, directivity, emission and reception sensitivity, etc. Transducers for different purposes have different requirements on performance parameters. For example, for transmitting transducers, the transducers are required to have large output power and high energy conversion efficiency; for receiving transducers, wide Frequency band and high sensitivity and resolution, etc. Therefore, ...

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Application Information

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IPC IPC(8): G01N29/44
Inventor 周正干滕利臣
Owner BEIHANG UNIV
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