A Multimodal Signal Separation Method Based on Lamb Wave Structure

A signal separation and wave structure technology, which is applied in the processing of detection response signals, analysis materials, instruments, etc., can solve problems such as complex signals, and achieve the effects of simple models, reliable results, and less time required for calculations

Active Publication Date: 2019-12-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lamb wave is a kind of ultrasonic guided wave that exists in plate structures. It has multiple modes. The propagation speed and wave structure of different modes of Lamb wave are different, which makes its signal very complicated. At present, many methods use low frequency Lamb wave to generate a single mode Lamb wave to avoid the problem of signal complexity

Method used

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  • A Multimodal Signal Separation Method Based on Lamb Wave Structure
  • A Multimodal Signal Separation Method Based on Lamb Wave Structure
  • A Multimodal Signal Separation Method Based on Lamb Wave Structure

Examples

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Embodiment

[0034] Embodiment: S in the isotropic aluminum plate adopting the method disclosed by the invention 0 and A 0 The specific steps of the modal signal separation method example are as follows: in conjunction with the method content of the present invention, it is provided to simulate S in the isotropic aluminum plate with finite element software 0 and A 0 An example of the modal signal separation method, the specific steps are as follows:

[0035] (1) Establish a two-dimensional plate structure model with finite element software. The length of the model is 300mm, the thickness is 3mm, the material is aluminum, and its density is 2700kg / m 3 , Young's modulus is 70GPa, Poisson's ratio is 0.33.

[0036] (2) A 5-period sinusoidal displacement signal modulated by a Hanning window is applied as an excitation signal at the left end of the model, and the center frequency f is 200KHz. The excitation signal is a uniformly distributed displacement signal loaded along the wall thickness...

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Abstract

The invention discloses a Lamb wave structure-based multi-mode signal separation method. One or more modes are extracted from a multi-mode Lamb wave signal according to the wave structure features of different modes of Lamb wave; each mode-information in the multi-mode Lamb wave signal can be quantitatively analyzed; the method can be used for researching the phenomena such as reflection, transmission and mode conversion of each mode of Lamb wave at the discontinuous position of the structure and can also be used for researching the problem of the amplitude value of an excitation signal of each mode of Lamb signal under different excitation conditions.

Description

technical field [0001] The invention relates to a multi-mode signal separation method based on a Lamb wave structure. Background technique [0002] Many large-scale structures such as aircraft wings, long-distance oil pipelines, and offshore platforms are very complex and harsh in service environments, and will gradually be damaged during use and eventually lead to structural failure. Therefore, damage detection of these structures is very necessary. Since these are large structures, traditional non-destructive testing methods are inefficient or even difficult to implement, so ultrasonic guided wave testing technology is required. The ultrasonic guided wave detection technology is to excite the ultrasonic guided wave in the structure, the ultrasonic guided wave propagates in the structure, and reflection, transmission and mode conversion will occur when encountering the discontinuity of the structure, and the structure can be judged by the received ultrasonic guided wave sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/46
CPCG01N29/46G01N2291/023G01N2291/0289
Inventor 武湛君周凯周震寰徐新生杨正岩赵祯
Owner DALIAN UNIV OF TECH
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