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Lamb wave frequency dispersion compensation method based on wave number curve measurement

A compensation method and a technology for measuring waves, which are applied in the direction of processing the detection response signal, etc., can solve the problems of application limitation, no consideration of the influence of interpolation processing on the original excitation signal, and complicated processing process, so as to improve applicability, facilitate implementation, The effect of increasing the resolution

Active Publication Date: 2012-07-11
PLA UNIV OF SCI & TECH
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Problems solved by technology

Wilcox eliminates the dispersion characteristic by transforming the signal from the time domain to the space domain. Due to the transformation of the signal domain, the processing process is more complicated.
Liu and Yuan interpolated the sensing signal spectrum to compensate for the dispersed A in the aluminum plate 0 Mode signal, this method does not consider the influence of interpolation processing on the original excitation signal, and requires known structural material parameters to calculate the theoretical wavenumber curve, the application is limited

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  • Lamb wave frequency dispersion compensation method based on wave number curve measurement
  • Lamb wave frequency dispersion compensation method based on wave number curve measurement
  • Lamb wave frequency dispersion compensation method based on wave number curve measurement

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Embodiment 1

[0044] In this embodiment, a glass fiber epoxy resin composite material board is used as the structure to be tested, and the size is 1000mm×1000mm×2mm. The structural material parameters are unknown, and the theoretical wavenumber curve cannot be obtained. There are 8 piezoelectric sheets P arranged in the structure 1 ~P 8 The piezoelectric array is formed, and the Cartesian coordinate system is established with the center of the structure as the coordinate origin, and the distribution and position of the piezoelectric sheets in the coordinate system are shown in figure 2 and Table 1. The monitoring equipment consists of waveform generation and data acquisition system, power amplifier and matrix switch controller. Among them, the LAI200-ISA arbitrary waveform generation card, signal amplification card and PCI-9812 data acquisition card in the waveform generation and data acquisition system respectively realize the functions of Lamb wave excitation waveform generation, sens...

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Abstract

The invention provides a Lamb wave frequency dispersion compensation method based on wave number curve measurement. The method comprises the steps that: (1) a wave number curve is measured; (2) the obtained wave number curve is linearized; (3) a Lamb wave impulse response spectrum is obtained; (4) impulse response under the linearized wave number is obtained; and (5) a frequency dispersion compensation Lamb wave signal is constructed. The method provide by the invention has technical effects that: (1) the method is realized with a fast Fourier and inverse Fourier transform algorithm, such that the compensation can be rapidly realized; (2) every frequency dispersion wave pack in the signal can be re-compressed, such that the resolution and signal-to-noise ratio of the signal are improved; (3) the time domain position of each wave pack in the signal is maintained, such that subsequent damage localization and imaging can easily be carried out; and (4) the wave number curve is directly measured in a structure, such that the method is suitable for situations that theoretical wave number cannot be obtained due to the factor that the structure material parameters are unknown.

Description

technical field [0001] The invention relates to a Lamb wave signal processing method, in particular to a Lamb wave dispersion compensation method. Background technique [0002] Important structures such as manned aircraft, nuclear reactors and bridges will inevitably suffer from various forms of damage during their service. In order to avoid disasters or losses caused by structural damage, long-term and effective monitoring of these structures must be carried out. Traditional non-destructive testing Technology is no longer able to meet this monitoring requirement. To this end, the researchers proposed the concept of structural health monitoring. Structural health monitoring technology is an online, dynamic and real-time monitoring technology, which has developed rapidly in recent years and plays an increasingly important role in the safety and reliability assessment of engineering structures. As a kind of ultrasonic guided wave propagating in plate structure, Lamb wave has...

Claims

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Application Information

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IPC IPC(8): G01N29/44
Inventor 石立华蔡建周颖慧李炎新付尚琛张兵马丁
Owner PLA UNIV OF SCI & TECH
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