Wind tunnel test model attitude calibration device and calibration method

Abstract

The invention discloses a wind tunnel test model attitude calibration device and calibration method. The device comprises an angle pole, a piston rod, a pointed cone positioning block, a model and thelike. The angle pole can be screwed into a piston rod threaded hole, and the axial direction of the angle pole 4 can be ensured to be parallel to an incoming flow of a wind tunnel. An angle pole lugboss is regulated to level the angle pole, and a screw is screwed into a cylinder cover threaded hole to press the piston rod, thereby fixing the positions of the piston rod and the angle pole. A square lug boss is arranged at the end portion of the angle pole, and can be mounted together with a square hole of the model to fix the model. The pointed cone positioning block is screwed into an anglepole threaded hole, and positioning surfaces of the pointed cone positioning block are ensured to form surface contact with cylindrical lug boss outer end faces. According to the device and the method, a fixed distance between each point is given by use of pointed cone positioning points, all ratios of a real scale in a wind tunnel and an image pixel in three directions are obtained by shooting with a camera, and meanwhile, the problem of incapability in accurately regulating a roll angle in the prior art is solved by use of the angle pole, so that completely six-degree-of-freedom attitude parameter calibration of the model can be completed, and the measurement accuracy is greatly improved.

Description

technical field [0001] The invention relates to support and launching of a wind tunnel test model, in particular to a wind tunnel model attitude calibration device and a calibration method, belonging to the field of aerospace engineering. Background technique [0002] The non-contact measurement method will not interfere with the wind tunnel flow field, and the test data does not need to be corrected too much, which is a major trend in wind tunnel test data collection. Using a camera, especially high-speed photography, to take pictures of the test model is the most common non-contact measurement method used by testers, and the conventional wind tunnel free flight test is also based on this measurement method. Although non-contact measurement has many advantages, there are also certain problems. For example, in the free flight test of the wind tunnel, the model is completely free. How to accurately interpret the real attitude of the model through the captured images has alway...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, the present invention provides a wind tunnel model attitude calibration device and calibration method. The model attitude calibration device is installed on the wind tunnel scimitar, and the fixed distance between each point is given by the pointed cone positioning point, and the camera is taken. Get the ratio of the real scale in the wind tunnel to the image pixel in all three directions, and use the corner rod to solve the problem that the roll angle cannot be adjusted accurately in the previous technology, so that the attitude parameter calibration of the model with 6 degrees of freedom can be completed, which greatly improves the measurement accuracy

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