The invention provides a method for quickly predicting the inflation time of a parafoil, which comprises the following steps of: according to the structural characteristics of multiple air chambers and unfolding folding of the parafoil and the shape change characteristics of a canopy, decomposing the shape change of the canopy in the inflation process of the parafoil into an airfoil unfolding stage and an air chamber inflation stage; the parafoil inflation time comprises airfoil unfolding time and air chamber inflation time. The airfoil unfolding time model is analogous to an inflation time model of a square parachute, and an inflation time correction coefficient is influenced by the number of parachute cords per unit area of the parafoil; the air chamber inflation time is determined by the air chamber full volume and the air inlet average speed. According to the method, the parafoil structure and the inflation appearance change are combined, the complex unsteady nonlinear large-deformation fluid-solid coupling behavior of the canopy is simplified, the parafoil inflation time can be rapidly and accurately predicted, and the method has important significance on rapid estimation of the height loss in the parafoil system inflation process, optimization design of the parafoil opening working condition and parafoil opening performance analysis.

    本发明提出了一种翼伞充气时间的快速预测方法,包括以下步骤:根据翼伞多气室、展向折叠的结构特点及伞衣外形变化特点,将翼伞充气过程的伞衣外形变化分解为翼面展开和气室充气两个阶段,翼伞充气时间包括翼面展开时间和气室充气时间。翼面展开时间模型类比于方形伞的充气时间模型,充气时间修正系数受翼伞单位面积伞绳数量影响;气室充气时间由气室充满体积和进气口平均速度确定。本方法结合翼伞结构及充气外形变化,将伞衣复杂的非定常非线性大变形流固耦合行为简化,能快速、准确地预测翼伞充气时间,对快速估算翼伞系统充气过程的高度损失、翼伞开伞工况的优化设计及开伞性能分析均有重要意义。


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    Title :

    Rapid prediction method for parafoil inflation time


    Additional title:

    一种翼伞充气时间的快速预测方法


    Contributors:
    YU LI (author) / PENG LIJIE (author) / LI YANJUN (author) / SUN ZHIHONG (author)

    Publication date :

    2022-06-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT



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