Method for extracting profiling feature parameters of aeronautical blade based on central axis

Abstract

The invention discloses a method for extracting profiling feature parameters of an aeronautical blade based on a central axis. The method comprises the steps of intercepting section of a blade measuring model and generating corresponding point cloud data; acquiring a convex hull and obtaining two points pL and pR which are in the maximum distance away from each other; roughly extracting data point sets of the front edge of the blade and the rear edge of the blade; finely extracting data point sets of the front edge and the rear edge of the blade; acquiring the front curve Xp (t) and the back curve Xb (t) of the blade; extracting a central arc line of the section of the blade according to the central axis theory. According to the method, the front edge and rear edge parameters are respectively roughly extracted and finely extracted bys steps; the central arc parameters are extracted based on the central axis theory, so that the operation efficiency is high and the result accuracy is improved; the processing parameters of the blade in processing can be correspondingly adjusted according to the obtained parameters of the central arc line of the section of the blade and the front edge and the rear edge, and therefore, the blade processing quality can be improved.

Description

technical field [0001] The invention belongs to the technical field of aviation blade processing, and more specifically relates to a method for extracting profile characteristic parameters of aviation blades based on the central axis, which is used to determine the profile characteristic parameters of the blade (including leading and trailing edges, central arcs, etc.). Background technique [0002] Aeroengine blade is a special part, it has been working in the harsh environment of high temperature and high pressure for a long time, and it has a large number, complex shape, high requirements, difficult processing, and is a part with frequent failures. It has always been produced by various engine factories The essential. At the same time, with the improvement of engine efficiency, the blade profile has become more and more complex, the processing difficulty has become more and more difficult, and the precision requirements have become higher and higher. The quality of the b...

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a method for extracting characteristic parameters of aviation blade profiles based on the central axis, wherein by improving its key analysis steps, simulation calculation methods, etc., it is different from the existing Compared with existing technologies, it can effectively solve the problems of error in feature parameter extraction results and low accuracy of mid-arc extraction, and the method is stable in calculation, high in efficiency, and low in time cost

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