环帆伞可变参数对设计偏差的灵敏度分析

环帆伞初步设计时，部分参数需要设计人员根据经验进行选取，选取过程并没有固化的规则，使得在完成环帆伞几何结构的初步设计之后，需要对这些参数进行多次调整才能使设计结果满足预定的设计指标。文章将这一类影响设计结果并且没有规范化选取方法的设计参数定义为可变参数，并首次对环帆伞设计过程中初次设计结果与设计指标之间存在的面积偏差与结构透气量偏差规律进行了研究，同时分析了可变参数与这两个偏差的灵敏度关系，为设计人员提供利用可变参数修正初次设计偏差的参考依据，减少可变参数的调整次数，提高环帆伞设计工作的效率。

Alternative-parameter Sensitivity of Ringsail Parachute Design Deviation

In the process of initial parachute design, some parameters should be chosen by the experience of designers without standard rule, which leads to a long time to adjust these parameters to meet the initial target after the geometrical design being finished. We define those parameters that lack certain rules but affect the design result as Alternative-Parameters（AP） in this article. Design deviations of area and porosity are considered and the sensitivities of AP that are related to these deviations are analysed, which form a basic conclusion that can be a reference for designers to eliminate the initial design deviation and make the process of ringsail design shorter and more efficient.