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Selection Method of Lamb Wave Signal Filtering Frequency Band 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, etc., and achieve the effect of high accuracy, high reliability, and removal of unstable interference

Active Publication Date: 2021-12-28
TIANJIN UNIV
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  • Summary
  • 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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  • Selection Method of Lamb Wave Signal Filtering Frequency Band in Stiffened Plate
  • Selection Method of Lamb Wave Signal Filtering Frequency Band in Stiffened Plate
  • Selection Method of Lamb Wave Signal Filtering Frequency Band 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 filter frequency band of a Lamb wave signal in a stiffened plate, which is characterized in that: the steps of the method are: 1) establishing a three-dimensional simulation model; 2) applying an excitation signal; 3) simulation processing; 4) Pre-selected frequency band adjustment; 5) frequency band selection; 6) filter frequency band acquisition; 7) building a signal detection system; 8) result comparison. The invention is scientific and reasonable, comprehensively considers factors such as signal energy ratio, stability and video characteristics, gradually narrows the filtering frequency band, and determines the final filtering frequency band. The method has high reliability and high accuracy 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 Patents(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