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T spline surface-based porous sandwich structure and application

A spline surface and porous structure technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of difficult and efficient generation of porous sandwich structures, undiscovered design methods, etc., to achieve stable and reliable generation methods, High continuity and smoothness, the effect of reducing the consumption of manufacturing materials

Active Publication Date: 2018-08-03
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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  • T spline surface-based porous sandwich structure and application
  • T spline surface-based porous sandwich structure and application
  • T spline surface-based porous sandwich structure and application

Examples

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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 Image 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 manufactur...

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Abstract

The invention discloses a T spline surface-based porous sandwich structure. The structure is obtained through a method comprising the following steps of: inputting two T spline surfaces, an implicit porous structure function expression, a surface discrete grid resolution and an inter-surface interpolation grid resolution; carrying out isoperimetric segmentation on the two T spline surfaces according to the surface discrete grid resolution so as to obtain discrete grids; generating uniformly distributed interpolation grids between the two T spline surfaces according to the inter-surface interpolation grid resolution and the T spline surface discrete grids; carrying out linear interpolation according to the interpolation grids and the implicit porous structure function expression so as to generate a porous structure; and finally storing the generated porous sandwich structure into an STM format and outputting the STM-format porous sandwich structure. The invention furthermore discloses an application of the T spline surface-based porous sandwich structure as wing wall panel 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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IPC IPC(8): G06F17/50
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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