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Ergun theory-based prediction method for breathability of parachute cloth fabric

A prediction method, parachute technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc.

Inactive Publication Date: 2014-10-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is still essentially fitting two sets of airflow data, and currently only a few canopy fabric materials can find sufficient test data, and most fabric materials only provide airflow under standard pressure differences, so The fitting method shows its limitations

Method used

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  • Ergun theory-based prediction method for breathability of parachute cloth fabric
  • Ergun theory-based prediction method for breathability of parachute cloth fabric
  • Ergun theory-based prediction method for breathability of parachute cloth fabric

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Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...

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Abstract

The invention discloses an Ergun theory-based prediction method for breathability of parachute cloth fabric. The method adopts the steps of (1), simplifying the Ergun formula in the breathability theoretical calculation according to the features of the parachute cloth fabric, so as to obtain a calculation formula for relative breathability under the standard test conditions; (2), obtaining a simplified Ergun breathability coefficient; (3), obtaining a breathability equation of the parachute cloth fabric and predicting the breathability of the parachute cloth fabric according to the breathability equation. Better prediction on the breathability of various parachute cloth fabrics in the medium-low pressure difference can be performed under the condition of insufficient test data, and the breathability performance of the parachute cloth fabric can be conveniently and fast predicated in the work process of a parachute.

Description

technical field [0001] The invention relates to a method for predicting the air permeability of canopy fabrics, in particular to a method for predicting the air permeability of parachute canopy fabrics based on Ergun theory. Background technique [0002] As an efficient aerodynamic decelerator, parachute has a wide range of applications in airborne airdrops, aerial bomb stabilization and recovery of various aerospace vehicles. The performance of a parachute mainly depends on its own aerodynamic characteristics, and the air permeability of the canopy fabric of the parachute is an important factor determining the aerodynamic characteristics of the parachute. Indicators have a significant impact. [0003] Most of the air permeability equations of canopy fabrics are obtained through a large number of experiments and by fitting multiple sets of pressure difference-air permeability data, and there are few related predictive theoretical studies. In recent years, with the maturity...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 宁雷鸣张红英连亮童明波陆伟伟秦福德
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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