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Segmentation method of leading and trailing edge of blade section line based on adaptive threshold value of curvature radius

A technology of radius of curvature and section line, which is applied in the field of front and rear edge segmentation of aeroengine blade section line, to achieve good stability, improve segmentation accuracy, eliminate bad points and the effect of convex and concave on the curve

Active Publication Date: 2019-03-05
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

This method has better stability, can effectively eliminate the influence of bad points and convex pits on the curve, and the segmentation accuracy will be greatly improved, effectively solving the defects in the existing methods

Method used

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  • Segmentation method of leading and trailing edge of blade section line based on adaptive threshold value of curvature radius
  • Segmentation method of leading and trailing edge of blade section line based on adaptive threshold value of curvature radius
  • Segmentation method of leading and trailing edge of blade section line based on adaptive threshold value of curvature radius

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Embodiment Construction

[0031] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0032] refer to figure 1 , taking a turbine blade as an example to describe the present invention in detail.

[0033] Step 1: Obtain the section line of the blade from the 3D model of the blade.

[0034] Open the blade entity parts in UG, such as figure 1 , the minimum and maximum height of the section is obtained on the three-dimensional model of the blade, and the height difference is the height H of the blade body.

[0035] Calculation of blade body section curve: ①Given the number of section lines N, calculate the distance value of the section lines D=H / (N-1) through the blade body height H and the number N. ② Taking the bottom plane of the blade as the reference plane, a set of reference planes F is obtained through the distance value D and the number ...

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Abstract

The present invention provides a blade section line front and rear edge segmentation method based on curvature radius adaptive threshold values. The method comprises: performing pre-segmentation of a curve according to the preliminarily calculated threshold value, determining whether the curvature radiuses of four segmentation points satisfy a threshold value test condition or not, if the curvature radiuses of four segmentation points satisfy the threshold value test condition, considering that the threshold values are reasonable, or else, regulating the threshold values for repeat segmentation, and repeating the steps until the curvature radiuses of four segmentation points satisfy the threshold value test condition. The blade section line front and rear edge segmentation method based on the curvature radius adaptive threshold values has good stability, can effectively eliminate the influence of bad points and convex-concave pits on the curve and greatly improve the segmentation precision so as to effectively solve the defects in the prior art.

Description

technical field [0001] The invention relates to a method for segmenting front and rear edges of a section line of an aero-engine blade, in particular to a method for segmenting the front and back edges of a section line of an aero-engine blade based on an adaptive threshold value of curvature radius. Background technique [0002] At present, there are three types of data boundary points between the front and rear edges of the blade body section line of the aeroengine blade and the blade back of the blade basin: ① There is a clear boundary point between the front and rear edges and the blade back of the blade basin through calculation, for example, the back of the blade basin (aerodynamic data points) and front and rear edges (known circle center and radius), the boundary point can be accurately judged by calculating the tangent position of the spline and the arc; For example, from the measured points, the number of points on the front and rear edges is relatively dense compa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/11G06T7/136
Inventor 莫蓉孙辉袁迪高利飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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