Method for measuring six-freedom-degree displacement and attitude of model

Abstract

The invention discloses a method for measuring the six-freedom-degree displacement and attitude of a model. A cross calibration rack is used for simulating a model and a wind tunnel coordinate system is established by using an absolute measuring arm; on the basis of measurement of coordinate values of a first circular hole, a second circular hole, a third circular hole and a fourth circular hole in the cross calibration rack under the wind tunnel coordinate system, a vector L1 of an axis of a first rod piece and a vector L2 of an axis of a second rod piece are calculated and an included angel between the vector L1 and a horizontal plane, an included angle between vector L1 and a vertical surface, and an included angle between the vector L2 and the horizontal plane are calculated; a pitching angle, a yaw angle and a rolling angle of the cross calibration rack are calculated and thus a pitching angle, a yaw angle, and a rolling angle of the model are calculated; and a mass center coordinate of the model under the wind tunnel coordinate system is calculated by using a coordinate value of a calibration hole in the wind tunnel coordinate system. Therefore, the integrated measuring problem of the displacement and attitude of the wind tunnel testing model can be solved; and measurement on the six-freedom-degree displacement and attitude of the model is realized. The measuring precision is high and the calculation speed is fast.

Description

technical field [0001] The invention belongs to the field of wind tunnel tests, in particular to a method for measuring the six-degree-of-freedom displacement and attitude of a model. Background technique [0002] The multi-body separation test usually uses a multi-degree-of-freedom motion mechanism to support the test model, and the test model performs multi-degree-of-freedom motion in the wind tunnel. The degrees of freedom of the test model include three translational degrees of freedom and three rotational degrees of freedom. The translational degrees of freedom of the model are represented by the x, y, and z coordinates of the model's center of mass in the wind tunnel coordinate system, and the rotational degrees of freedom of the model are represented by three Euler angles, which are: pitch angle Yaw angle ψ, roll angle γ. [0003] Traditional tools for measuring the position and attitude of the test model include quadrants, spirit levels, and calipers. These measur...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems, the present invention provides a method for measuring the six-degree-of-freedom displacement and attitude of the model, which overcomes the limitations of the existing measurement tools and methods, and satisfies the comprehensive requirements of the model displacement and attitude angle in the multi-body separation and delivery wind tunnel test. measurement requirements

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