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Adaptive segmentation method of blade edge head section profile based on curvature change

A technology of curvature change and blade edge, which is applied in image analysis, image enhancement, instruments, etc., can solve difficult problems and achieve the effect of narrowing the search range

Active Publication Date: 2022-06-07
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the size deviation of the edge head, it is necessary to separate the edge head from the leaf pot and the leaf back in the profile measurement data. Due to the complexity of the blade profile line, it is difficult to accurately analyze the above elements. Difficulties

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  • Adaptive segmentation method of blade edge head section profile based on curvature change
  • Adaptive segmentation method of blade edge head section profile based on curvature change
  • Adaptive segmentation method of blade edge head section profile based on curvature change

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Embodiment Construction

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Judging the machining quality according to the actual characteristic parameters of the blade profile and the profile error is a common method for the inspection of the finished blade. This requires accurate and rapid acquisition of complete profile data to ensure that subsequent error analysis results are effective and reliable. The discretized sampling of the blade profile can be achieved by using optical scanning measurement, but due to the limitation of sampling density, it is difficult to ensure accurate acquisition of the profile data of the specified blade section (blade profile). The usual practice is to take a certain height range near the blade section. The point cloud is projected to obtain the point cloud data of the blade profile, and then the precise blade profile data is extracted. At the same time, due to the influence of various me...

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Abstract

The invention discloses a method for adaptively segmenting blade edge head section profile line based on curvature change. The method is divided into two parts: determination of initial edge head range and accurate segmentation based on curvature change, in combination with the shape characteristics of the blade shape. The present invention narrows the search range through preliminary positioning, improves the robustness of the algorithm on the basis of reducing the amount of search data, and then combines the characteristics of the leaf shape to accurately segment the edge head through the change of the curvature radius, and solves the problems caused by leaf pots, The blade back shape line is a free curve, and when calculating the division point (tangent point) of the two, an analytical solution cannot be obtained and because the blade is affected by various error factors during manufacturing and testing, and the sampling rate is limited during measurement The resulting deviation between the measured data of the profile of the blade profile and the theoretical model makes it difficult to accurately segment the edge head.

Description

technical field [0001] The invention belongs to the field of precision measurement, and in particular relates to a method for adaptively dividing the profile line of a blade edge head section based on curvature change. Background technique [0002] Blades are a core component of aero-engines, accounting for about 30% of the entire engine manufacturing. Blades are thin-walled parts and work in harsh conditions such as high load and complex stress. In order to ensure its special performance, the airfoil profile is usually designed as a free-form surface, and has strict requirements on size, shape accuracy and strict surface integrity, and requires high manufacturing accuracy. The overall size of the blade span is large, the profile is complex, and the processing such as casting or milling is easy to cause deformation. The mass of the blade has a great influence on the secondary flow loss of the engine, which directly determines its energy conversion efficiency. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/11G06T7/12G06T7/62
CPCG06T7/11G06T7/12G06T7/62G06T2207/20004G06T2207/30108
Inventor 丁建军刘阳鹏马玉山常占东刘海波徐乐王旭李保锁蒋庄德蔡磊
Owner XI AN JIAOTONG UNIV
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