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A Spatial Attitude Determination Method for Assembly Contact Based on Measured Surface Topography

A technology for determining the spatial attitude and method, applied in design optimization/simulation, special data processing applications, etc., can solve problems such as not considering changes in the spatial attitude of parts, and achieve the effect of improving accuracy

Active Publication Date: 2020-04-28
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method only starts with the construction of the finite element model of the parts, and does not consider the changes in the spatial attitude of the parts after assembly.

Method used

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  • A Spatial Attitude Determination Method for Assembly Contact Based on Measured Surface Topography
  • A Spatial Attitude Determination Method for Assembly Contact Based on Measured Surface Topography
  • A Spatial Attitude Determination Method for Assembly Contact Based on Measured Surface Topography

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Embodiment Construction

[0028] In order to make the purpose of the present invention, technical solutions and advantages described more clearly, the assembly contact of two actual milled rectangular samples A and B (60mm × 60mm) is taken as an example below (wherein A block is the lower part, and B block is the upper part), in conjunction with the accompanying drawings in the embodiments of the present invention, the technical solution in the present invention is described completely.

[0029] The surface three-dimensional topography data A of the milled sample block is obtained by testing the flatness measuring instrument k×3 , B k×3 . The instrument uses a non-optical measurement system with a resolution of 5nm and a measurement size range of 20-200mm. where the point cloud matrix A k×3 Such as figure 2 As shown, the point with the z-coordinate of 1000 represents the missing data point.

[0030] The measured point cloud matrix A k×3 The x, y, and z coordinates in are extracted to obtain the ...

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Abstract

The invention provides a method for determining the spatial posture of the assembly contact based on the measured surface topography, which starts with the point cloud processing technology and the assembly stacking technology, and decomposes the measured joint surface topography data in multiple scales. The topographic features of the high frequency part which has little influence on the assemblyposture are filtered, and the noise generated in the measurement process of the joint surface is removed. The method comprises steps: determining a plane according to the three points, finding out the three points that the upper and lower surfaces contact first when assembling, and judging the three points in turn. The normal vector of the plane determined by three points is used to represent thespatial posture of the assembly of the upper and lower parts. According to the spatial attitude, the assembly model is constructed. Therefore, the accuracy of contact analysis is improved to a certain extent. The method of the invention makes the initial contact setting in the finite element model of the assembly more conform to the actual requirements, and improves the accuracy of the assembly simulation analysis.

Description

technical field [0001] The invention relates to a method for determining the spatial posture after two parts including topography are assembled together, in particular to a method for determining the spatial posture based on the assembly contact of the measured surface topography. Background technique [0002] There are a large number of joint surfaces in the process of assembly and connection, especially in high-end equipment such as aerospace and precision machine tools. The contact analysis of these joint surfaces has an important impact on the prediction of the performance of the whole machine. The measured joint surfaces contain shapes of various scales. In addition, the upper and lower parts are not in ideal contact during the assembly process, but the asperities are in contact first, which will cause the spatial attitude of the upper and lower parts to change during assembly. The resulting deflection error will make it difficult to accurately analyze the friction of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 孙清超赵斌斌穆晓凯汪云龙
Owner DALIAN UNIV OF TECH
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