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Wing vibration detection device and method based on three-dimensional digital speckle correlation method

A vibration detection and three-dimensional digital technology, which is applied in the direction of measuring devices, elastic testing, optical devices, etc., to achieve accurate and reliable signals, high flexibility, and increased flexibility

Active Publication Date: 2017-10-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings and deficiencies of the prior art, and to provide a wing vibration detection device based on a three-dimensional digital speckle correlation method. To solve the problem of real-time acquisition of displacement information of measured points during wing vibration and deformation, three-dimensional digital speckle correlation method is used to detect the deformation of the wing surface, and the displacement or strain information is extracted according to the statistical characteristics of the region of interest during image processing and analysis , making the information obtained from the measurement more accurate and reliable

Method used

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  • Wing vibration detection device and method based on three-dimensional digital speckle correlation method

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Embodiment 1

[0031] Such as figure 1As shown, the present embodiment provides a wing vibration detection device based on a three-dimensional digital speckle correlation method, including a wing body part, a vibration detection part, a vibration excitation part and a computer (11), and the wing body part includes The wing (4) and the film (3) painted with dense spots, the film (3) is closely attached to the surface of the wing (4), so that the upper surface of the wing (4) shows continuous and evenly distributed spots, the wing (4) One end is mechanically connected to the metal support (6) through a splint (5), the metal support (6) is vertically installed on the horizontally placed test platform (7), and the other end of the wing (4) is a free end, After the installation is completed, the surface of the wing (4) is in a horizontal state, and is parallel to the surface of the test stand (7), and the end pasted with dense spot film (3) is a free end; the vibration detection part includes two...

Embodiment 2

[0036] This embodiment provides a wing vibration detection method based on a three-dimensional digital speckle correlation method, the method comprising the following steps:

[0037] Step 1, the vibration excitation signal that signal generator (10) produces passes to exciter (8) after power amplifier (9) amplifies, and exciter (8) carries out vibration excitation to wing body part, in wing ( 4) Loads of different forms and degrees are applied near the free end to cause corresponding deformation on the surface of the wing (4);

[0038] Step 2. After the corresponding deformation occurs on the surface of the wing (4), the two high-speed cameras (2) in the vibration detection part perform synchronous and continuous image acquisition on the surface area of ​​the wing (4) showing dense spots. The image is transmitted to the computer (11), and sub-regions with independent speckle features are divided and selected on the image. After corresponding image matching and three-dimensiona...

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Abstract

The invention discloses a wing vibration detection device and a wing vibration detection method based on a three-dimensional digital speckle correlation method. The wing vibration detection device comprises a wing body part, a vibration detection part, a vibration excitation part and a computer, wherein the wing body part comprises a wing and a thin film painted with dense spots; the vibration detection part comprises two high-speed cameras and a camera bracket; the vibration excitation part comprises an exciter, a power amplifier and a signal generator; the vibration excitation part conducts vibration excitation on the wing body part, so that the surfaces of the wing deform accordingly; the vibration detection part performs synchronous and continuous image acquisition in the wing surface scope displaying the dense spots; the acquired images are transmitted to the computer, displacement information data obtained through corresponding image registration and by adopting the three-dimensional digital speckle correlation method is imported into relevant processing software, three-dimensional curved surface fitting operation is conducted on the displacement information data, so as to display the morphology during wing vibration or deformation, thereby realizing visualized operation.

Description

technical field [0001] The invention relates to the field of positioning and vibration detection of flexible structures, in particular to a wing vibration detection device and method based on a three-dimensional digital speckle correlation method. Background technique [0002] The size of the aspect ratio has a significant impact on the flight performance of the aircraft. When the aspect ratio increases, the induced drag of the wing will decrease, which can improve the maneuverability of the aircraft and increase the subsonic range. The aspect ratio also affects the lift generated by the wing. If the wing area is the same, as long as the aircraft is not close to a stall state, the lift generated by the wing with a large aspect ratio is also large under the same conditions, thus reducing the take-off and landing of the aircraft. Rolling distance and improved maneuverability. High-altitude and long-endurance aircraft require a long time in the air and a long range, so most o...

Claims

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Application Information

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IPC IPC(8): G01H9/00G01B11/02G01M5/00
CPCG01B11/022G01H9/00G01M5/005G01M5/0066Y02T90/00
Inventor 王涛先邱志成
Owner SOUTH CHINA UNIV OF TECH
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