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Inflation flexible structure inherent characteristic solving method

A technology with inherent characteristics and flexible structure, applied in special data processing applications, complex mathematical operations, instruments, etc., can solve problems such as few researches

Active Publication Date: 2015-06-24
BEIHANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Force-finding analysis is the basis for solving the prestressed mode of membrane structures with a given target shape, but there are not many studies on force-finding analysis of inflated membrane structures with a given target design shape

Method used

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  • Inflation flexible structure inherent characteristic solving method
  • Inflation flexible structure inherent characteristic solving method
  • Inflation flexible structure inherent characteristic solving method

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Embodiment

[0156] In order to fully understand the characteristics of the invention and its applicability to engineering practice, the invention adopts MATLAB programming to carry out modal analysis verification on a flexible airship main airbag. On the basis of the initial shape of the main airbag of the flexible airship, the finite element model of the flexible airship is established by using thin shell elements, and the prestressed equilibrium shape is obtained by applying 300Pa inflation pressure for nonlinear static analysis. The modal analysis of the main airbag of flexible airship is carried out by Sifa. Material elastic modulus E=1.096×10 9 Pa, thickness t=0.382mm, density ρ=727.27273kg / m 3 , Poisson's ratio μ=0.3. When extracting the modal results, eliminate the rigid body mode, and compare the results with the analysis results of the self-programmed program.

[0157] The airship busbar equation is divided into four sections, the finite element model of the airship is shown i...

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Abstract

The invention discloses an inflation flexible structure inherent characteristic solving method. The method comprises the steps that firstly, according to the stress characteristic of an inflation film structure, the geometric nonlinearity factors such as large deformation and initial prestress are taken into consideration, a reset balancing method is introduced to conduct force finding analysis, and the stress distribution corresponding to a given target form and inflation pressure is obtained; secondly, a stiffness matrix of an inflation balancing state is inherited, and a ritz vector direct superposition method is adopted for conducting numerical value calculation on the mode of the inflation film structure. By means of the inflation flexible structure inherent characteristic solving method, the balancing state is easier to obtain when the form analysis of the inflation film structure is conducted, the stress distribution of the balancing state is more real, and thus the obtained inherent characteristic is more reasonable.

Description

technical field [0001] The invention is applicable to the prestress modal analysis of the inflatable membrane structure, and is used for solving the prestress distribution and inherent characteristics of the inflatable flexible structure with a given target design shape, and can provide guidance for solving the dynamic response of the inflatable membrane structure. Background technique [0002] The inflatable membrane structure is a special form of membrane structure. The inflatable membrane structure uses air pressure to stretch the membrane material, make the membrane surface tense, and endow a certain structural rigidity to resist external loads. Due to a series of advantages such as high strength, light weight, high cost-effectiveness ratio, and small storage volume, the inflatable film structure has been widely used in construction, aerospace and other fields. All kinds of architectural membrane structures have various forms and shapes, and have become a new architectur...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/11
Inventor 汪俊邱志平王晓军何巍
Owner BEIHANG UNIV
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