Elbow reconstruction and allowance calculation method based on point cloud data

A technology of point cloud data and calculation method, which is applied in calculation, image data processing, complex mathematical operation, etc. It can solve the problems of not being able to obtain the characteristic parameters of the elbow, and not calculating the geometric center of the end face of the elbow, so as to ensure the final smooth construction. , Improve assembly accuracy and assembly efficiency, and the effect of high-precision 3D reconstruction

Pending Publication Date: 2020-08-04
XIAN SPACE ENGINE CO LTD +1
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Problems solved by technology

In the calculation process, not enough elbow feature parameters can be obtai

Method used

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  • Elbow reconstruction and allowance calculation method based on point cloud data
  • Elbow reconstruction and allowance calculation method based on point cloud data
  • Elbow reconstruction and allowance calculation method based on point cloud data

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[0059] The present invention will now be further described in conjunction with the embodiments and drawings:

[0060] Such as figure 1 Shown: The present invention provides a method for reconstruction and margin calculation of elbows based on point cloud data, including the following steps:

[0061] S1: Obtain the elbow point cloud data through a 3D scanner and input it into the computer;

[0062] S2: Calculate the normal information of the elbow point cloud;

[0063] A kd-tree data structure is established for the point set to be measured, and k neighboring points of the sample points are searched as the neighborhood point set Q. For the sample point, use its k-nearest neighbor point set, and fit the weighted least squares plane as the tangent plane at this point.

[0064] First calculate the centroid of the tangent plane, that is

[0065]

[0066] Then use the PCA algorithm to calculate the normal vector of the tangent plane. Including the construction of the weighted covariance matr...

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Abstract

The invention relates to a elbow reconstruction and allowance calculation method based on point cloud data. The method comprises the following steps: collecting elbow point cloud data; carrying out elbow point cloud normal vector calculation; using an MSAC algorithm to detect and extract the straight line segment of the elbow, and achieving elbow segmentation; calculating characteristic parametersof the bent section; extracting the geometric center of the end face; reconstructing the elbow by utilizing the characteristic parameters and the control points; carrying out 3D characterization of the flange; and finally, establishing a catheter cutting allowance energy function, and calculating and determining the cutting allowance and the cutting position of the catheter. According to the elbow reconstruction and allowance calculation method based on the point cloud data, the assembly precision and the assembly efficiency of the guide pipe and the flange can be effectively improved, data support is provided for a guide pipe machining system, and it is guaranteed that a guide pipe allowance removal platform is finally and smoothly built.

Description

technical field [0001] The invention belongs to complex curved surface measurement and modeling technology, and relates to a bend pipe reconstruction and margin calculation method based on point cloud data. Background technique [0002] Elbows are an important part of complex electromechanical products in the modern aerospace industry. They are the "vascular system" densely distributed on aero-engines, covering the entire body of the engine. They are responsible for the transmission of air-conditioning, gas and other fluid media from the engine to various components. [0003] Since engine ducts are usually produced in a customized manner, consistency is difficult to guarantee, and the position accuracy of flanges on the engine is not high. In the production process of aerospace engines, it is often necessary to manually repair the conduits repeatedly, resulting in low assembly efficiency, poor precision, and high labor intensity. In order to realize the high-precision assem...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06F17/10
CPCG06T17/005G06T17/00G06F17/10G06T2200/08Y02P90/30
Inventor 谭永华夏仁波许艺峰安然党琰李万鹏闫明晖李彩云周长军张飞飞
Owner XIAN SPACE ENGINE CO LTD
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