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Method for identifying points in pits on convex surface

An identification method and pit technology, which are applied to measuring devices, instruments, optical devices, etc., to achieve the effect of saving computing time and simplifying operations.

Active Publication Date: 2018-09-28
YANTAI NANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when the surface is convex, the identification method for the surface is not applicable. In order to obtain the minimum width and waviness of the pit, it is first necessary to solve the problem of identifying the midpoint of the pit on the convex surface

Method used

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  • Method for identifying points in pits on convex surface
  • Method for identifying points in pits on convex surface
  • Method for identifying points in pits on convex surface

Examples

Experimental program
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Effect test

Embodiment Construction

[0011] with (x ij ,y ij ,z ij )(i,j=1,2,Λ,n) represents the coordinates of the measuring points on the surface of the object to be tested under a certain three-dimensional measurement coordinate system o-xyz, according to the characteristics of the laser array, where (x i1 ,y i1 ,z i1 ), (x i2 ,y i2 ,z i2 ),..., (x in ,y in ,z in )(i=1,2,Λ,n) in the same plane, (x 1j ,y 1j ,z 1j ), (x 2j ,y 2j ,z 2j ),..., (x nj ,y nj ,z nj )(j=1,2,Λ,n) in the same plane.

[0012] If there is no pit in the area to be inspected, for any positive integer u, v, when i=1, 2, Λ, n, j=2, 3, Λ, n-1, j-u>0, j+v≤ n always have

[0013]

[0014] Similarly, for any positive integer u, v, when j=1,2,Λ,n, i=2,3,Λ,n-1, i-u>0, i+v≤n always have

[0015]

[0016] If the point set (x ij ,y ij ,z ij )(i,j=2,3,Λ,n-1) violates the above two inequalities, it can be concluded that the point (x ij ,y ij ,z ij ) is in the pit, but this identification method has too much computation, s...

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Abstract

The invention discloses a pit identification method for the convex surface of a to-be-detected object. The method is characterized in that the three-dimensional coordinates, under one coordinate system, of each point in lattices in a certain area can be measured through a detection system formed by laser arrays; a transverse and longitudinal searching method is used to identify whether each line or each row of measuring points is located in the pits or not according the two adjacent measuring points of the measuring points, the points which are identified as the points in the pits are removedfrom a point range, the process above is repeatedly performed on the rest of the point range, the process is continuously repeated if new points are identified until no new points are identified, andaccordingly all the points in all the pits can be obtained. The method is simple in operation, capable of saving calculation time and capable of identifying the points in the pits on both the convex surface and a flat surface.

Description

technical field [0001] The invention relates to a method for identifying the midpoint of a pit on a convex surface Background technique [0002] During the take-off and landing of the aircraft, the skin, wall panels and fairing foreskin will form local pits due to the impact of foreign objects, such as birds in the air, or other accidents. Dimples will increase the flight resistance of the aircraft and affect the flight performance of the aircraft. When the surface is flat, the three-dimensional coordinates of each point in the lattice in a certain area under a certain coordinate system can be measured through a detection system composed of a laser array, and the points located in the pit can be identified through these coordinates. Thereby, the minimum width and waviness of the pit are obtained, and thus it is determined whether the pit exists and whether it needs to be repaired. But when the surface is convex, the identification method for the plane surface is not applic...

Claims

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/002
Inventor 孙玉梅车九妹赵静蕾高爱梅安凯刘彦斌高翔
Owner YANTAI NANSHAN UNIV