A porous sandwich structure based on t-spline surface and its application

A spline surface, porous structure technology, applied in special data processing applications, instruments, geometric CAD, etc., can solve the problems of difficult and efficient generation of porous sandwich structures, no design methods are found, and the generation method is stable, reliable, and highly continuous. performance and smoothness, the effect of reducing the consumption of manufacturing materials

Active Publication Date: 2021-02-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the literature analysis, the current published patents or literature are mainly aimed at the design of traditional manufacturing process methods, as well as the design methods of generating lattice porous structures inside some simple structural parts, which are limited by the manufacturing process or design methods, wing panels, etc. It is difficult to efficiently generate porous sandwich structures between complex surfaces. In addition, no literature has been found on the design method of porous sandwich structures between T-spline surfaces

Method used

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  • A porous sandwich structure based on t-spline surface and its application
  • A porous sandwich structure based on t-spline surface and its application
  • A porous sandwich structure based on t-spline surface and its application

Examples

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Effect test

Embodiment 1

[0061] Select the vibration isolation layer of special-shaped mechanical parts to design and generate a porous sandwich structure. In order to closely fit complex special-shaped mechanical parts, use T-spline surface to model the two surfaces of adjacent parts, and generate a porous sandwich structure between the surfaces of the two parts , which can realize the vibration isolation function between mechanical parts in complex motion conditions. The expression of the implicit porous structure function is:

[0062] 10×(cosxsiny+cosysinz+coszsinx)-0.5×[cos(2x)×cos(2y)+cos(2y)×cos(2z)+cos(2z)×cos(2x)]-14=0, na= 80, nb=80.

[0063] Such as Figure 5 As shown, an ordered porous sandwich structure is designed and generated between two T-spline free-form surfaces. The generated structure is saved as an STL model and manufactured by rapid prototyping technology, which plays an ideal role in vibration isolation.

Embodiment 2

[0065] The wing panel is selected to generate a lightweight porous sandwich structure. The complex free-form surfaces of the wing upper panel and the lower panel are modeled and designed by T-spline surface respectively. The expression of the implicit porous structure function is selected as: 0.5×[sin (2x)×cos(y)×sin(z)+sin(2y)×cos(z)×sin(x)+sin(2z)×cos(x)×sin(y)]-0.5×[cos( 2x)*cos(2y)+cos(2y)*cos(2z)+cos(2z)*cos(2x)]+0.15=0, na=80, nb=80.

[0066] Such as Figure 6 As shown, the method of the present invention is used to generate a lightweight porous sandwich structure between the free curved surfaces of the upper and lower wall panels of the wing, which can reduce material consumption and energy consumption while satisfying mechanical properties. The sandwich structure designed and generated is manufactured using additive manufacturing technology. Compared with the solid wall plate structure of the same material and size, the porous sandwich structure designed and manufactu...

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Abstract

The invention discloses a porous sandwich structure based on a T-spline surface. The structure is obtained by the following methods: including inputting two T-spline surfaces, an implicit porous structure function expression, a discrete grid resolution of the surface, and Interpolation grid resolution; according to the surface discrete grid resolution, the two T-spline surfaces and other parameters are divided into discrete grids; according to the surface interpolation grid resolution and the T-spline surface discrete grid, the two A uniformly distributed interpolation grid is generated between T-spline surfaces; a porous structure is generated by linear interpolation according to the interpolation grid and the implicit porous structure function expression; finally, the generated porous sandwich structure is saved as an output in STL format. The invention discloses the application of a porous sandwich structure based on a T-spline curved surface as a wing wall plate material.

Description

technical field [0001] The invention belongs to the field of CAD (Computer-aided design), and specifically relates to a porous sandwich structure based on a T-spline curved surface and its application. Background technique [0002] The porous sandwich structure is a new type of material structure widely used in the engineering field. With the compression characteristics of the sandwich structure and the ductility of the panel, the porous sandwich has important applications in aerospace, construction and other applications. With sandwich structures of different physical properties, the porous sandwich can be used as a functional structure such as vibration absorption, sound insulation, and lightweight, while maintaining excellent mechanical properties while minimizing material consumption. The skin-skeleton structure widely used in aerospace vehicles is one of the typical representatives of the application of porous sandwich structures. According to different types of sandwi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F111/10G06F113/10G06F119/14
CPCG06F30/15G06F30/20G06F2111/10
Inventor 傅建中冯嘉炜商策林志伟李斌
Owner ZHEJIANG UNIV
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