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Method for rebuilding front and back oval edges of aerial blade based on error control

An aviation blade and error control technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as poor anti-noise performance, achieve good anti-noise performance, and improve the effect of reconstruction quality

Inactive Publication Date: 2015-07-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the existing blade leading edge high-precision reconstruction methods with poor anti-noise performance, the present invention provides an error control-based method for reconstructing the elliptical leading and trailing edges of aviation blades

Method used

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  • Method for rebuilding front and back oval edges of aerial blade based on error control
  • Method for rebuilding front and back oval edges of aerial blade based on error control
  • Method for rebuilding front and back oval edges of aerial blade based on error control

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Embodiment Construction

[0029] refer to Figure 1-5 . The specific steps of the method for reconstructing the elliptical leading and trailing edges of aviation blades based on error control in the present invention are as follows:

[0030] (1) Read in the profile line discrete measurement data of the blade, and select the area points covering the leading edge or trailing edge of the blade;

[0031] (2) Sort the area points;

[0032] (3) Cubic spline fitting is carried out to the sorted regional points;

[0033] (4) Encrypt and discretize the fitted spline curve with equal arc length, and record the start and end discrete points as P 0i ,P 1i ;

[0034] (5) Use the least squares method for P 0i P 1i segment discrete points for fitting, and P 0i P 1i P 0(i+1) ,P 1(i+1) ;The ellipse fitting method is as follows:

[0035] ①Establish the objective function of ellipse fitting:

[0036] In the plane, by the quadratic polynomial equation

[0037] f(x,y)=ax 2 +2bxy+cy 2 The curve represented b...

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Abstract

The invention discloses a method for rebuilding front and back oval edges of an aerial blade based on error control, which is used for solving the technical problem of poor anti-noise performance existing in the conventional high-precision rebuilding method for a front edge of a blade. According to the technical scheme, the method comprises the following steps of: selecting region points covering the front edge or the back edge of the blade; sequencing the region points; performing spline fitting on the sequenced region points for three times; performing equal-arc-length encryption discretion on fitted spline curves, and marking beginning and end discrete points as P0i and P1i respectively; fitting discrete points at a P0iP1i section by using a least square method, and marking beginning and end discrete points on the intersection of the P0iP1i section and a fitting oval as P0(i+1) and P1(i+1) respectively; calculating an average error epsiloni ranging from the discrete points to an ith fitting oval; and setting an iteration control error as epsilon till the epsiloni is less than or equal to epsilon to finish iteration. According to the method, the front and back oval edges of the blade are rebuilt by adopting an error control-based iterative fitting method on the basis of fitting through the least square method, so that points on a non-oval circular arc in the selected region are prevented from participating in fitting, and the anti-noise performance is improved.

Description

technical field [0001] The invention relates to a method for reconstructing the elliptical leading and trailing edges of aviation blades, in particular to a method for reconstructing the elliptical leading and trailing edges of aviation blades based on error control. Background technique [0002] The shape of the leading and trailing edges of the blade plays a key role in the aerodynamic performance of the entire blade. The traditional front and rear edges are generally designed to be arc-shaped. With the deepening of blade research in recent years, many experiments and numerical studies have shown that the use of non-arc-shaped leading edges, such as elliptical leading edges, can significantly improve the aerodynamic performance of the blade. [0003] In the process of reconstructing the elliptical leading and trailing edges of the blade based on the measured data, the selected area points to be fitted may include points on the leaf pot and the leaf back. If the points on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 程云勇朱真真汪文虎王增强杨杰李维亮李向欣郑佳王丽雅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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