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Monocular video high precision measuring method for wing wind tunnel test model elastic deformation

A technology of elastic deformation and wind tunnel test, applied in the field of wind tunnel test, it can solve the problems of bending deformation, reduction of Y coordinate value, coordinate value error, etc.

Active Publication Date: 2017-01-11
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

[0011] But for the wing test model, such as figure 1 As shown in , due to its cantilever beam structure, obvious bending deformation will occur under aerodynamic load, resulting in a decrease in its Y coordinate value (that is, along the span direction), especially the Y coordinate value closer to the wing tip The greater the reduction, the (X, Z) coordinate value obtained by the monocular video measurement method through formula (1) will produce errors

Method used

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  • Monocular video high precision measuring method for wing wind tunnel test model elastic deformation
  • Monocular video high precision measuring method for wing wind tunnel test model elastic deformation
  • Monocular video high precision measuring method for wing wind tunnel test model elastic deformation

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Embodiment Construction

[0046] A monocular video high-precision measurement method for elastic deformation of a wing wind tunnel test model, comprising the following steps:

[0047] Step one, as figure 2 As shown, a camera is fixedly installed outside the wind tunnel observation window, and the camera pose parameters and focal length are adjusted to cover the measurement area of ​​the entire wing test model;

[0048] Step 2. Use mature machine vision and photogrammetry methods to obtain the distortion parameters of the camera optical system and its figure 2 The pose parameters in the wind tunnel coordinate system yoz shown;

[0049] Step three, as image 3 Mark points are drawn on the upper surface of the neutral axis of the wing test model, each marking point determines a section, and the upper surface marking point of the neutral axis of the 0th section is set at the connection between the wing and the fuselage. At the root of the wing, there is no deformation here, i.e. draw a marker The de...

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Abstract

The invention discloses a monocular video high precision measuring method for wing wind tunnel test model elastic deformation. Based on a fact that relative deformation of two adjacent cross sections of a wing wind tunnel test model is small linear elasticity deformation, coordinate figures of corners and deformation mark points Y of all cross sections are orderly calculated from a wing root according to a superposition principle; a conventional monocular video measuring method is adopted, the coordinate figures of the deformation mark points Y are brought in a collinearity equation, and deformation data of the mark points on all the cross sections can be orderly obtained. Via the monocular video high precision measuring method, monocular video measurement errors of wing wind tunnel test model elastic deformation can be greatly reduced, only one camera needs to be used, multi-view video measurement precision can be obtained, hardware cost of a measurement device can be lowered, tedious homonymous point matching work of multi-view video measurement can be prevented, the monocular video high precision measuring method is particularly suitable for an environment where camera installation positions are limited, and the monocular video high precision measuring method has great engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of wind tunnel test of machine vision and photogrammetry, in particular to a monocular video high-precision measurement method of elastic deformation of a wing wind tunnel test model. Background technique [0002] With the increase of the size of the wind tunnel test section, the corresponding model size and aerodynamic load increase, and the elastic deformation of the model and its support system becomes more and more obvious during the test. For example, the aerodynamic load on the model in the 2.4-meter transonic wind tunnel test is as high as several tons, and even the high-strength steel wing will undergo obvious elastic deformation, and a large number of studies have shown that: transition, separation, and shock wave / boundary layer interference Such complex flow phenomena are very sensitive to shape changes, and subtle changes in the shape of the model may lead to large changes in aerodynamic character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 张征宇彭章国黄叙辉茆骥王超刘明敏范金磊刘田
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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