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Method for selecting filtering frequency band of Lamb wave signals in stiffened plate

A technology of signal filtering and stiffened plates, applied in the field of signal processing, can solve the problems of undiscovered patent documents, achieve high accuracy, remove unstable interference, and reduce difficulty

Active Publication Date: 2020-01-14
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the search of published patent documents, no published patent documents identical to this patent application have been found

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  • Method for selecting filtering frequency band of Lamb wave signals in stiffened plate
  • Method for selecting filtering frequency band of Lamb wave signals in stiffened plate
  • Method for selecting filtering frequency band of Lamb wave signals in stiffened plate

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Embodiment Construction

[0053] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0054] A method for selecting a filter frequency band of a Lamb wave signal in a stiffened plate, the innovation of which is that the steps of the method are:

[0055] 1) Taking the stiffened plate structure of the sealed bulkhead of the manned spacecraft as the experimental object, according to its geometric size, a three-dimensional finite element simulation model is established by using Abaqus simulation software;

[0056] 2) Apply the excitation signal at the excitation point in the center of the board, and receive the signal at 7 receiving points;

[0057] 3) Carry out simulation, extract the out-of-plane displacement of each receiving point, and carry out Fourier transform to it, and obtain the energy ratio of each receiving point;

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Abstract

The invention relates to a method for selecting a filtering frequency band of Lamb wave signals in a stiffened plate. The method is characterized by comprising the steps of: 1) establishing a three-dimensional simulation model; 2) applying an excitation signal; 3) performing simulation processing; (4) adjusting a pre-selected frequency band; (5) selecting a frequency band; (6) acquiring a filtering frequency band; (7) constructing a signal detection system; and (8) carrying out result comparison. The method is scientific and reasonable, comprehensively considers factors such as energy proportion, stability and video features of the signals, gradually reduces filtering frequency bands and determines the final filtering frequency band, is high in reliability, and is high in accuracy degree of the obtained filtering frequency band.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a method for selecting a filter frequency band of a Lamb wave signal in a stiffened plate. Background technique [0002] Ultrasonic waves propagate in the form of Lamb waves in plate materials. However, when Lamb waves pass through scatterers such as defects, bonding surfaces, and ribs, phenomena such as reflection, energy attenuation, and wave mode conversion will occur. For example, the reflection of the Lamb wave increases with the frequency of the Lamb wave and the depth of the notch, but the relationship with the width of the notch shows a periodic oscillation. For the Lamb wave signal in a stiffened plate, the transmitted energy and frequency of the Lamb wave tend to oscillate under the same stiffener, and this trend is more obvious on the stiffener with a larger height-thickness ratio. Among them, when the resonant frequency of Lamb wave in S0 mode coincides with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44G06F30/23G06T17/20
CPCG01N29/043G01N29/44G06T17/00
Inventor 李一博王晢芮小博綦磊刘嘉玮
Owner TIANJIN UNIV
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