The invention discloses a parachute inflation unfolding dangerous section obtaining method, which comprises the following steps: statically unfolding a parachute canopy, measuring the unfolding area # imgabs0 # of the parachute canopy, and calculating the unfolding diameter # imgabs1 # of the parachute canopy; the method comprises the following steps: firstly, arranging strain gauges on each longitudinal reinforcing band of a canopy along the longitudinal direction, then connecting a parachute cord end of a parachute to the rear end of a stabilizer bar, when the wind speed of a wind tunnel reaches a preset value, extending the stabilizer bar out of a fairing, inflating and unfolding the parachute in a wind tunnel flow field, and collecting strain # imgabs2 # of each strain gauge in the inflating and unfolding process of the parachute; selecting the maximum strain value # imgabs3 # on each warp-wise reinforcing band, obtaining the distance # imgabs5 # from the strain gauge at the maximum strain value to the canopy top hole according to the # imgabs4 # and the distribution position of the strain gauge through conversion, and dividing the symmetrical warp-wise reinforcing bands into one group in pairs, the sum of the single-side dangerous distance # imgabs6 # of the two warp-wise reinforcing bands in each group is calculated, the maximum value of the sum is selected as the diameter # imgabs7 # of the dangerous section of the canopy, and then the dangerous section # imgabs8 # of the canopy is obtained. The method can be used for conveniently and accurately acquiring the dangerous section of the parachute during inflation and unfolding.

    本发明公开一种降落伞充气展开危险截面获取方法,将伞衣静态展开,测量伞衣展开面积#imgabs0#,并计算伞衣展开直径#imgabs1#;先在伞衣的各条经向加强带上沿经向分布设置应变片,然后将降落伞的伞绳端连接在稳定杆后端,风洞风速达到预定值时,稳定杆伸出整流罩,降落伞在风洞流场中充气展开,采集降落伞充气展开过程中每处应变片的应变#imgabs2#;选出每条经向加强带上的最大应变值#imgabs3#,并根据#imgabs4#以及应变片的分布位置换算得到最大应变值处应变片到伞衣顶孔的距离#imgabs5#,将对称的经向加强带两两分为一组,计算每组中两条经向加强带的单侧危险距离#imgabs6#之和并选择其中的最大值为伞衣危险截面直径#imgabs7#,进而得到伞衣危险截面#imgabs8#。本方法能方便准确的获取降落伞充气展开危险截面。


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    Title :

    Method for acquiring dangerous section of parachute during inflation and unfolding


    Additional title:

    降落伞充气展开危险截面获取方法


    Contributors:
    LAN WENCHANG (author) / ZHOU JIAN (author) / HAO RONG (author)

    Publication date :

    2024-02-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT / G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS , Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen




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