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A method for constructing volume model including multi-scale topography features

A technology of shape characteristics and construction methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as no surface topography recognition, troublesome finite element model establishment, etc.

Active Publication Date: 2019-02-19
DALIAN UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

Although this type of method can ensure that each point cloud data is not missing, it has not completed the accurate identification of surface topography at different scales, and can only model some relatively simple and regular rectangular plate-shaped parts, while the It is troublesome to establish some finite element models containing holes and rounded corners

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  • A method for constructing volume model including multi-scale topography features
  • A method for constructing volume model including multi-scale topography features
  • A method for constructing volume model including multi-scale topography features

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Embodiment Construction

[0034] In order to make the purpose of the present invention, technical solutions and advantages described more clearly, the sample block (60mm * 60mm) surface of an actual milling is taken as an example below, in conjunction with the accompanying drawings in the embodiments of the present invention, the technical solution in the present invention is carried out full description.

[0035] Using a flatness measuring instrument to test the milled sample block to obtain the surface three-dimensional topography data A of the milled sample block k×3 . The instrument uses a non-optical measurement system with a resolution of 5nm and a measurement size range of 20-200mm. Measured point cloud matrix A k×3 Such as figure 1 As shown, the point with the z-coordinate of 1000 represents the missing data point.

[0036] The measured point cloud matrix A k×3 The x, y, and z coordinates in are extracted to obtain the corresponding component matrix X m×n , Y m×n ,Z m×n ; Among them, th...

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Abstract

The invention provides a method for constructing a volume model including multi-scale topography features. Starting from a point cloud processing technology and a volume model construction technology,based on measured surface topography data, the measured surface topography data are decomposed in multi-scale, and data components of different scales are identified by combining a time-frequency analysis method. Reverse engineering modeling method is used to construct volume model for the processed data. to the method can identify the point cloud data of different scales, and perform multi-scalemodeling according to the analysis requirements; In the process of modeling, 3D modeling can be carried out in a more intuitive way, and the generated volume model can be Boolean operation, which tosome extent solves the problem of constructing the complex characteristics of bolt holes, grooves and so on in the volume model with surface topography.

Description

technical field [0001] The invention relates to a method for building a volume model including multi-scale shape data, in particular to a method for building a finite element model considering the relatively macroscopic shape of a joint surface. 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 performance of the whole machine, and the contact of the joint surface actually includes multi-scale morphology features. The rough surface contact has an important influence on the joint surface friction, stress distribution, connection stiffness and so on. [0003] For a long time, scholars at home and abroad have done a lot of research on surface contact including topographical features. In terms of theoretical analysis models, many classic contact models have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 孙清超赵斌斌穆晓凯汪云龙
Owner DALIAN UNIV OF TECH
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