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Method for actively detecting defects in metal thin-walled structure part

A thin-walled structural part, active detection technology, applied in measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, etc. It can solve the problem of low recognition ability and avoid complexity. , Simplified extraction method, easy to measure effect

Inactive Publication Date: 2016-03-23
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an active detection method for defects in metal thin-walled structural parts using difference-frequency ultrasonic Lamb wave signals. The application limitations brought about by the complex characteristics of Lamb waves propagating in thin-walled metal structures simplifies the extraction method of ultrasonic Lamb wave characteristic parameters

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  • Method for actively detecting defects in metal thin-walled structure part
  • Method for actively detecting defects in metal thin-walled structure part

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specific Embodiment approach 1

[0018] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, a method for actively detecting defects in metal thin-walled structural parts described in this specific embodiment The test system includes an arbitrary waveform generator 1, a first transmitting transducer 2, and a second transmitting transducer 3 , non-contact laser vibrometer 4, digital signal oscilloscope 5, computer 6, measured thin-walled structural member 7, first coaxial data transmission line 8, second coaxial data transmission line 9, third coaxial data transmission line 10, The fourth coaxial data transmission line 11 and the fifth coaxial data transmission line 12, the signal output end of the non-contact laser vibrometer 4 is electrically connected to the digital oscilloscope 5 signal input end through the coaxial data transmission line 10, and the digital oscilloscope 5 can Receive and store the signal collected by the non-contact laser vibrometer 4 in real time, the s...

specific Embodiment approach 2

[0019] Embodiment 2. The difference between this embodiment and the method for actively detecting defects in metal thin-walled structural parts described in Embodiment 1 is that the first transmitting transducer 2 and the second transmitting transducer 3 are Piezoelectric crystals of the same type and material, the resonant frequency of the first transmitting transducer 2 and the second transmitting transducer 3 is 1MHz, and are vertically coupled with the thin-walled structural member 7 to be tested through epoxy resin.

specific Embodiment approach 3

[0020] Embodiment 3. The difference between this embodiment and the method for actively detecting defects in metal thin-walled structural parts described in Embodiment 1 is that the channels of the arbitrary waveform generator 1 include input channels and output channels. The input channel is that the waveform signal can be downloaded into the arbitrary waveform generator 1 through the computer 6, and the output channel is four independent channels, and the transmission signals of different frequencies can be selected at the same time. The present invention only uses the first one of the output channels. output channel and a second output channel.

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Abstract

The invention discloses a method for actively detecting defects in a metal thin-walled structure part, and relates to the field of thin-walled structure part nondestructive detecting. The thin-walled structure part is excited by two different lines of frequency ultrasonic Lamb waves at the same time; through time-frequency combined analysis, the modulation spectrum generated by the defects is rapidly found, the Lamb wave characteristic parameter extracting method is simplified, and the problem that the existing ultrasonic recognition accuracy for fine defects is not high is solved. A testing system comprises a random waveform generator, a transmitting transducer, a non-contact laser vibration measurement instrument, a digital signal oscilloscope, a computer, a tested medium and five coaxial data transmission lines. The random waveform generation is loaded with the two different lines of frequency ultrasonic Lamb waves through the computer, a transmitting transducer array is loaded with signals through the random waveform generator at the same time, and the signals are collected by the non-contact laser vibration measurement instrument, displayed and stored by the oscilloscope and then transmitted to the computer to be analyzed so that Lamb waves and defect related characteristic parameters can be found. The method is suitable for rapidly detecting the defects in the metal thin-walled structure part.

Description

technical field [0001] The invention relates to the field of non-destructive testing of metal thin-walled structural parts, in particular to a method for actively detecting defects in metal thin-walled structures by using difference-frequency ultrasonic Lamb wave signals. Background technique [0002] Thin-walled structural parts with a thickness below 6mm are widely used in the aerospace industry, automobile industry, and shipbuilding industry. However, the defects such as crack defects introduced in the process of processing or rolling forming of thin-walled structural parts will pose a threat to the safety of product manufacturing and use. At the same time, due to external loading and changes in the use environment, it may cause the expansion of small defect sources inside the thin-walled structural parts, and then cause damage accidents. An important means for the reliable application of metal thin-walled structural parts in the automotive industry. Therefore, it is ne...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/041
Inventor 高桂丽石德全董静薇李大勇
Owner HARBIN UNIV OF SCI & TECH
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