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Large-scale structure three-dimensional dynamic online measurement device and method

A technology for large-scale structures and measuring devices, which can be used in measuring devices, optical devices, and aircraft component testing. It can solve problems such as aircraft structural strength, aerodynamic layout effects, and deformation.

Active Publication Date: 2017-08-25
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially the large opening design like the hatch is easy to deform due to air pressure difference and other loads during the flight of the aircraft, and the gap between it and the fuselage will also change, which may affect the structural strength and aerodynamic layout of the aircraft. have an impact

Method used

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  • Large-scale structure three-dimensional dynamic online measurement device and method

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Embodiment 1

[0047] like figure 1 As shown, the three-dimensional dynamic on-line measuring device of the large-scale structure of the present embodiment includes: two groups of camera groups, trigger controller, synchronous source and image acquisition processing system; Wherein, image acquisition processing system includes data collector 10 and computer 11; One group of cameras includes two cameras 4a and 4b, the two cameras have the same imaging area but different imaging angles, and two light sources 5a and 5b; the second group of cameras includes two cameras 6a and 6b, and two light sources 7a and 7b; each camera is respectively connected to the trigger controller 9 and the data collector 10 through a data line; each light source is connected to the trigger controller through a data line to control the illumination brightness and flicker frequency of the light source, and to ensure the synchronization of the camera group There is a common imaging area 3 for shooting in two adjacent ca...

Embodiment 2

[0063] In this embodiment, the three-dimensional dynamic on-line measurement device in Embodiment 1 is used to measure the gaps of large-scale structures online, and the measurement method includes the following steps:

[0064] 1) to 6) are the same as in Embodiment 1.

[0065] 7) The image acquisition and processing system extracts the edges of the images taken by each camera group, performs stereo matching, and reconstructs the spatial coordinates of the edge lines:

[0066] a) performing rough edge extraction on the collected image;

[0067] b) performing sub-pixel extraction on the extracted edge by means of quadratic curve fitting and gray gradient, and performing sub-pixel positioning on the edge;

[0068] c) Extracting feature points on the edge, including concave and convex points at the bend of the gap and points on the straight line segment;

[0069] d) Through the feature points on the edge line, perform stereo matching on the two cameras in each group of cameras ...

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Abstract

The invention discloses a large-scale structure three-dimensional dynamic online measurement device and method. Multiple camera sets are employed, and each camera set comprises two cameras having different shooting angles, three-dimensional full field deformation of a large-scale complex structure can be measured, full field deformation conditions can be observed in real time, and a deformation field of each frame of the cameras can be analyzed after testing; through a fitting splicing method applied to a common imaging region of the camera sets, results of the camera sets are integrated to a coordinate system, the quantity of the camera sets can be enhanced according to demands, various types of large-scale structures can be measured, and full field three-dimensional coordinates and deformation fields of the structures can be measured; slit distances of curved structure surfaces are measured through edge detection, characteristic point extraction and pole line fitting, and all the slit distances of the visual field can be simultaneously measured; change of the structure is not required in a measurement process, no contact structure is needed, and deformation fields and the slit distances are processed simultaneously.

Description

technical field [0001] The invention relates to a large-scale structure dynamic on-line measurement technology, in particular to a large-scale structure three-dimensional dynamic on-line measurement device and a measurement method thereof. Background technique [0002] The flying altitude of the aircraft is generally higher. The flying altitude of the civil aviation airliner is generally about 10,000 meters in the stratosphere, while the flying altitude of the fighter jet can reach 20,000 meters or even higher. When the aircraft is at an altitude of 10,000 meters, its external atmospheric pressure is about 26.4KPa. For civil aviation airliners, in order to ensure the comfort of the passengers inside and for the consideration of aircraft structure design, the air pressure inside the cabin About 80KPa. It can be seen that there is a large air pressure difference inside and outside the aircraft during the flight of the aircraft, which will have a greater impact on the aircraft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/16B64F5/60
CPCB64F5/60G01B11/02G01B11/16
Inventor 冯雪索涛张超方旭飞屈哲苏红宏黄浦
Owner TSINGHUA UNIV
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