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Automatic design method for parachute cords of high-gliding parafoil

A design method and parafoil technology, applied in design optimization/simulation, parachute, emergency equipment, etc., can solve the problems that parafoils cannot reach the optimal gliding attitude, low design efficiency, large measurement error, etc., and achieve automatic operation, The effect of improving design accuracy and efficiency and avoiding errors

Pending Publication Date: 2022-07-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

Since the entire design process requires professional designers to complete manual drawing and measurement on the basis of experiments, the measurement error is large, and the designed parafoil often cannot achieve the optimal gliding attitude, resulting in poor gliding performance of the parafoil
At the same time, this manual drawing method has a large workload and low design efficiency

Method used

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  • Automatic design method for parachute cords of high-gliding parafoil
  • Automatic design method for parachute cords of high-gliding parafoil
  • Automatic design method for parachute cords of high-gliding parafoil

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Embodiment Construction

[0029] In this embodiment, the span length b of the parafoil is 8m, the chord length c is 4m, and the aspect ratio λ is 2.

[0030] The automatic design process of a high gliding paraglider paracord is as follows figure 1 As shown, the design program is realized by MATLAB programming. By integrating the aerodynamic characteristics calculation program of the parachute, the optimal gliding performance parafoil attitude design program and the automatic design program of the parachute parameters, it only needs to input the two-dimensional airfoil to automatically To calculate the parafoil rope parameters that meet the requirements of high gliding performance, the design procedure specifically includes the following steps:

[0031] Step 1. In this example, a typical parafoil airfoil is selected, such as figure 2 As shown, take the position of the leading edge of the airfoil chord line as the coordinate origin O, the chord line is the OX axis, and the upward is the Y axis, establi...

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Abstract

The invention discloses an automatic design method for a parachute cord of a high gliding parafoil, which comprises the following steps: calling two-dimensional airfoil aerodynamic characteristic calculation software, and combining with a parafoil canopy aerodynamic characteristic calculation model to obtain aerodynamic characteristics of a canopy at different attack angles; determining a parachute cord mounting angle according to the relationship among the gliding angle, the attack angle and the gliding ratio by taking the maximum gliding ratio as a design target; finally, parafoil cord parameters meeting the high gliding capacity are obtained according to the parafoil cord installation angles. According to the method, aerodynamic characteristic calculation, high-gliding-ratio flight attitude design and parachute cord parameter automatic design are integrally completed, a parachute cord configuration scheme of the parafoil with the high gliding capacity can be rapidly obtained, the design precision and efficiency of the parachute cords are improved, and the method has great significance in structural design of the high-gliding parafoil.

Description

technical field [0001] The invention relates to the technical field of parachute design, in particular to an automatic design method for a parachute rope of a high-glider parachute. Background technique [0002] Ram-type parafoils are widely used in the field of precision airdrop, and high gliding ability is an important goal of parafoil structure design. The gliding ability of the parafoil is mainly borne by the canopy. The higher the lift-drag ratio of the parafoil canopy, the better the gliding ability. The lift-drag ratio of a parafoil has the following characteristics: before stalling, the lift-drag ratio increases with the angle of attack, reaches a maximum value before stalling, and then decreases again. Therefore, at a certain angle of attack, the parafoil lift-drag ratio has a maximum value. Therefore, by determining the optimal angle of attack, the maximum gliding performance of the parafoil can be obtained. Due to the geometric correspondence between the flight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F30/10B64D17/24
CPCG06F30/28G06F30/10B64D17/24
Inventor 余莉屈琮渊李岩军董梁聂舜臣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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