Multi-camera dynamic calibration method for measuring model attitude angle in wind tunnel test

Abstract

The invention discloses a multi-camera dynamic calibration method for measuring model attitude angle in wind tunnel test, in which a relationship between three-dimensional coordinates of a known coordinate point and temperature change of a wind tunnel test section is established based on running temperature difference of the wind tunnel test section, thus the three-dimensional coordinates of the known coordinate point corresponding to the running temperature of the wind tunnel test section is obtained so that thermal expansion and cold contraction of the wind tunnel test section are taken into consideration when the position and the gesture of the cameras for taking every picture are calibrated; aiming at the problem that error of multi-camera photographing measurement is caused by asynchronous vibration in high-speed wind tunnel vibrating environment, the reference, which is adopted when the position and the gesture of the cameras for taking every picture are dynamically calibrated, is the known coordinate point adhered to the wind tunnel test section, as a result, the vibration during the running of the high-speed wind tunnel test section is considered so that the positions and the gestures of the cameras, derived from dynamic calibration, belong to the same wind tunnel coordinate system. The method of the invention can enhance the accuracy of measuring model attitude angle.

Description

technical field [0001] The invention relates to a method for real-time measurement of the motion attitude (angle of attack, side slip angle and roll angle) of a test model in a wind tunnel test. Background technique [0002] The attitude of the wind tunnel test model during the blowing test—the model’s angle of attack, sideslip angle, and roll angle are the basic data of the wind tunnel test. The model movement attitude data in the wind tunnel test is obtained in real time and accurately. is of great significance. But in the past, the acceleration sensor can only measure the angle of attack to measure the attitude of the model, but the sideslip angle cannot be measured because there is no gravity information. In addition, using the acceleration sensor to measure the angle of attack of the model needs to reserve a space for installing the acceleration sensor when making the model, and the application is also cumbersome. [0003] The image space geometric information of two ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the position and attitude of the camera cannot be calibrated during the operation of the wind tunnel; the manufacturing cost is high, and the coordinates of the marked points on this kind of step calibration plate are required to be very accurate

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