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Parachute canopy ventilation speed obtaining method

A technology of ventilation speed and parachute, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve problems such as the inability to combine parachute calculations, and achieve the effect of improving the efficiency of acquisition

Pending Publication Date: 2020-09-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

[0005] In short, the current calculation and prediction models only focus on the fabric itself, and the fabric pressure difference test is required, which cannot be organically combined with the actual high-altitude flight calculation of the parachute, and cannot directly obtain the air permeability of the parachute at any speed-height during the high-altitude flight of the parachute. speed

Method used

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  • Parachute canopy ventilation speed obtaining method
  • Parachute canopy ventilation speed obtaining method
  • Parachute canopy ventilation speed obtaining method

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] A kind of parachute canopy ventilation speed obtaining method designed by the present invention is used to realize the acquisition of the canopy ventilation speed of the target parachute at the target flight height and target flight speed. In practical applications, such as figure 1 As shown, the following steps A to C are specifically performed.

[0034] Step A. According to the canopy thickness δ of the target parachute and the porosity ε of the canopy fabric, according to the following formula:

[0035] D=6(1-ε)·δ

[0036] Obtain the breathable characteristic dimension D of the target parachute, and then enter step B.

[0037] Step B. According to the porosity ε of the canopy fabric of the target parachute and the characteristic size D of air permeability, according to the following formulas respectively:

...

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Abstract

The invention relates to a parachute canopy ventilation speed obtaining method. Various factors such as surrounding airflow attributes in the high-altitude flight process of a parachute, parachute flight speed and fabric microstructure characteristics are comprehensively considered. Based on a porous medium theory and a parachute canopy differential pressure-flight dynamic pressure equation in theparachute working process, the parachute canopy ventilation speed at any speed-height in the high-altitude flight process of the parachute can be rapidly calculated, and therefore guidance is provided for further calculation of the total ventilation amount of the parachute and design of the parachute. The whole technical scheme design does not need to pass a fabric air permeability test, a brandnew design scheme is adopted, and the obtaining efficiency of the target parachute canopy ventilation speed can be effectively improved.

Description

technical field [0001] The invention relates to a method for obtaining air permeability of a parachute canopy, which belongs to the technical field of air permeability of a parachute canopy. Background technique [0002] Parachute is an efficient aerodynamic deceleration device, which is widely used in various strategic tasks such as aviation lifesaving, airborne airdrop, and spacecraft return and landing. Both theory and practice have shown that important properties such as canopy inflation time, parachute opening dynamic load, stability, and steady descent speed of a parachute are inseparable from canopy air permeability. For parachutes, the fast and accurate calculation of canopy ventilation is of great significance to the design process. [0003] The air permeability of a parachute canopy is composed of fabric air permeability and structural air permeability. The structural air permeability is easy to calculate. The fabric air permeability is complex due to the comprehe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/15
CPCG06F30/20G06F30/15Y02T90/00
Inventor 余莉张思宇孙志鸿聂舜臣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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