Method for detecting smoothness of inner surfaces of wind tunnels

Abstract

The invention provides a method for detecting the smoothness of the inner surfaces of wind tunnels. The method includes steps of (a), scanning the inner surface of a wind tunnel by the aid of a three-dimensional laser scanner and acquiring point cloud data of the inner surface of the wind tunnel; (b), selecting a point in the point cloud data, selecting a point set in a specified range on the basis of the point and fitting the point set to obtain spatial planes; (c), determining deviation of each point in the point set and acquiring a difference value between a maximum deviation value and a minimum deviation value and using the difference value as an error of the surface smoothness of the region of the inner surface of the wind tunnel in the range of the point set; (d), comparing the error of the surface smoothness to a preset maximum permissible error, and combining a comparison result with other preset standards to determine whether the smoothness of the region of the inner surface of the wind tunnel in the range of the point set is qualified or not; (e), detecting the other points in the acquired point cloud data one by one according to procedures from the step (b) to the step (d). The method has the advantage that the smoothness of the full range of the inner surface of the wind tunnel can be detected by the method.

Description

technical field [0001] The invention relates to a method for detecting the flatness of a surface, in particular to a method for detecting the flatness of the inner surface of a wind tunnel. Background technique [0002] Wind tunnel refers to a kind of pipeline experimental equipment that can artificially generate and control airflow to simulate the flow of air around aircraft or objects, and can measure the effect of airflow on objects and observe physical phenomena. It is the most commonly used aerodynamic experiment. most efficient tool. During the experiment, the model or object is often fixed in the wind tunnel to obtain the experimental data repeatedly and economically. In order to make the experimental results accurate, the flow during the experiment must be similar to the actual flow state, that is, the requirements of the law of similarity must be met. However, due to wind Due to the constraints of tunnel size and dynamics, it is difficult to simulate all similar pa...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a method for detecting the flatness of the inner surface of the wind tunnel, which can realize the full-range detection of the flatness of the inner surface of the wind tunnel, and avoid the possibility of missing parts with large flatness errors in the sampling detection method. problems, and the detection position can be accurately positioned through point cloud coordinates, providing an accurate basis for subsequent repairs of areas where the flatness of the inner surface of the wind tunnel does not meet the standard

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