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Free-form surface structure form creation method considering load uncertainty

A technology for uncertain and curved surface structures, applied in the field of free-form surface structure creation, can solve problems such as difficult design and construction, unreliable robustness and reliability of free-form surface structures, and uncertain loads

Active Publication Date: 2019-08-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in actual engineering, there is inevitably uncertainty in the load (size, direction)
Compared with the traditional space structure, the geometry of the free-form surface structure is more complex, and the design and construction are more difficult, which makes its load more uncertain.
Neglect of load uncertainty during form creation leads to non-guaranteed robustness and reliability of free-form structures

Method used

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  • Free-form surface structure form creation method considering load uncertainty
  • Free-form surface structure form creation method considering load uncertainty
  • Free-form surface structure form creation method considering load uncertainty

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Embodiment Construction

[0185] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention but not to limit the scope of the present invention.

[0186] Such as figure 2 The projection of a plane shown is a square (12m×12m) free-form surface structure, which is simply supported at four corner points. Surface thickness t = 0.1m, elastic modulus E = 3 × 1010MPa, Poisson's ratio ν = 0.2. The control points are set as figure 2 shown. The control points 6, 7, 10, and 11 of the structure respectively act vertically downward uncertain concentrated loads: the load value f = 200kN is a definite quantity; the load direction (indicated by the angle θ between the load direction and the positive direction of the Z axis) is an uncertain quantity, and obeys a normal distribution with a mean of π and a standard deviation of 0.5, deno...

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Abstract

The invention discloses a free-form surface structure form creation method considering load uncertainty. The method is simple and effective in algorithm, and the problem that the robustness and reliability of a free-form surface structure cannot be guaranteed due to neglect of the load uncertainty in the form creation process is solved. The rigidity and robustness of the uncertainty optimized free-form surface structure are far better than those of an initial structure, and the stress performance is better; and when the size of the load is unchanged and the direction is uncertain, the robustness and reliability of the uncertainty optimization structure are far better than those of the deterministic optimization structure.

Description

technical field [0001] The invention relates to a method for creating a free-form surface structure shape considering load uncertainty. Background technique [0002] In recent years, free-form surface structures have been increasingly widely used because of their novel and unique shapes. The core issue of its design is form creation, that is, to realize the organic combination of surface diversity and force rationality. At present, the main form creation method is the numerical method based on the idea of ​​optimization. This method combines the geometric modeling technology of the free-form surface with the structural optimization algorithm, takes the geometric parameters of the surface shape as the optimization variable, and takes the reasonable force of the structure as the optimization goal. , using an appropriate optimization algorithm to solve, and obtain the optimal free-form surface shape. [0003] However, the existing methods for creating the shape of free-form s...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/20
CPCG06T17/20G06F30/23
Inventor 伞冰冰马云龙邱冶
Owner HOHAI UNIV
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