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A Reconfigurable Mechanism Structure Basic Morphological Construction Method

A construction method and mechanical structure technology, applied in the field of basic geometry modeling, can solve the problems of complex information processing, unfavorable model simplification, etc., and achieve the effect of retrieval and reuse

Active Publication Date: 2020-06-30
HUBEI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing basic body modeling method is not conducive to the simplification of the model, which leads to the problem of complex information processing in the model retrieval process, so as to provide a reconfigurable mechanical structure basic body shape with high modeling efficiency build method

Method used

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  • A Reconfigurable Mechanism Structure Basic Morphological Construction Method
  • A Reconfigurable Mechanism Structure Basic Morphological Construction Method
  • A Reconfigurable Mechanism Structure Basic Morphological Construction Method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] see figure 1 , when the basic body is a swept solid, construct the swept base 11 , contour constraint line 12 and swept guide 13 according to the features of the swept solid. During the movement of the sweeping base surface 11 along the sweeping wire 13 , the tangent L of the sweeping wire 13 at any moment (time t) t with centroid C t to contour track point A t connection C t A t angle, and at any moment the tangent L t The included angle with the swept base surface at this time is always constant. Therefore, the position and contour of the swept base surface 11 at time t are defined by the homogeneous coordinate transformation matrix T=T 1 T 2 T 3 T 4 OK, where T 1 Indicates the centroid C of the swept base surface 11 at the initial moment 0 The transformation matrix that translates to the origin of coordinates, let C 0 The point coordinates of (x 0 ,y 0 ,z 0 ),but T 2 Represents the proportional scaling transformation matrix of the sweeping base surf...

Embodiment 2

[0033] see figure 2 , when the basic body is a pyramid, the pyramid model described in this embodiment is constructed by moving the pyramid base surface 21 along the pyramid wire 23 under the constraints of the pyramid outline constraint line 24 . Because the pyramid conducting wire 23 is a straight line, and is coplanar with the pyramid outline constraint line 24, thereby the pyramid base surface 21 is in the sweeping motion process, the pyramid sweep surface 22 at any moment is all parallel to the pyramid base surface 21 , correspondingly the line connecting the centroid of the base surface and the contour locus points is also parallel, that is, the rotation angle θ of the base surface 1 , θ 2 , θ 3 Both are 0.

[0034] In the present embodiment, the sweep time period is normalized to [0,1], then the scale factor in the transformation matrix of the pyramid sweep surface 22 According to the spatial analytic geometric relationship, the scale factor can be directly expres...

Embodiment 3

[0037] see image 3 , when the basic body is a sphere, the sphere described in this embodiment is constrained by the sphere contour constraint line 34 from the sphere base surface 35 to the end point A at the same time along the sphere wire 33 n and A n ’ Motion composition. Since the spherical wire 33 is a straight line and coplanar with the spherical contour constraint line 34, the negative direction sweep surface 31 and the positive direction sweep surface 32 of the spherical base surface 35 at any moment during the sweeping motion process are all aligned with the spherical base surface 35. Parallel, the line connecting the corresponding geocenter and the contour locus points is also parallel, that is, the rotation angle θ of the base plane 1 , θ 2 , θ 3 Both are 0.

[0038] In this embodiment, the sweep time period is normalized to [0, 1], then the scale factor in the transformation matrix of the swept surface of the sphere It can be seen from the spatial analytic g...

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Abstract

The invention relates to the basic geometric body modeling technology field and particularly relates to a reconstructible mechanical structure basic body form construction method. The method comprises steps that (1), according to characteristics of a basic body, a corresponding scanning base, a scanning lead and a contour constraint line are constructed; (2), a scanning constraint angle is constructed; (3), an equal scale scaling transformation matrix of the scanning base relative to a coordinate origin is constructed; (4), a rotation transformation matrix of the scanning base relative to the initial time scanning base position is constructed; (5), a homogeneous coordinate transformation matrix of the scanning base in the motion process is constructed; and (6), a structure form of the basic body is constructed according to dimension relationships between the scanning base and the scanning lead of a conversion model. The method is advantaged in that structure form construction of the basic body is realized, a user is facilitated to efficiently construct the required structure model, different structure models can be rapidly constructed according to one same structure form, and retrieval and reuse of the mechanical structure models are facilitated.

Description

technical field [0001] The invention relates to the technical field of basic geometry modeling, in particular to a method for constructing a reconfigurable basic shape of a mechanical structure. Background technique [0002] At present, the basic geometry (referred to as primitive) modeling methods mainly include boundary representation, solid geometry construction, wireframe representation, scan representation and so on. In order to improve the reuse rate of structural models, the simplification of structural models has also been studied in the field of structural model retrieval, but many methods use the processing of image point sets, and do not directly use the analytic geometry knowledge of mechanical structural models known in the above modeling methods ; On the other hand, the above modeling methods do not provide a unified expression element that can be directly simplified in structure. [0003] It can be seen from the above that the current modeling method is not c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/10
CPCG06T17/10
Inventor 徐赐军
Owner HUBEI POLYTECHNIC UNIV