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考虑飞行载荷计算中使用的气动导数存在不确定性,利用基于方差的全局灵敏度分析(GSA)方法,结合偏航机动的动力学模型,分析了侧向气动导数不确定性对侧向飞行载荷的影响。以某型飞机为例,运用该方法得到侧向气动导数的全局灵敏度排序。结果表明:侧滑角、阻尼贡献的垂尾侧向载荷及垂尾侧向总载荷受全机侧力系数对侧滑角导数的影响最大,受航向静稳定导数及方向舵操纵效能的影响次之;方向舵偏度贡献的垂尾侧向载荷只受全机侧力系数对方向舵偏度导数的影响;无尾飞机侧向载荷主要受航向静稳定导数、方向舵操纵效能及无尾飞机侧力系数对侧滑角导数的影响;偏航阻尼导数基本不影响各侧向飞行载荷。同时也验证了方法的有效性,对提高飞行载荷的计算精度有一定的指导意义。
Taking into account the uncertainties of the aerodynamic derivatives used in the calculation of flight loads, the global sensitivity analysis (GSA) method based on variance is used in combination with the dynamic model of yaw maneuver to analyze the influence of the uncertainty of lateral aerodynamic derivatives on the lateral flight loads influences. Taking a certain type of aircraft as an example, this method is used to get the global sensitivity ranking of lateral aerodynamic derivatives. The results show that the lateral and vertical lateral total loads of side slip angle and damping side have the greatest effect on the side slip angle derivative due to the whole side lateral force coefficient, which is affected by the static stability of heading and rudder steering efficiency The lateral load of tail-end contributed by the rudder skewness is only affected by the whole-body lateral force coefficient on the rudder skewness derivative. The lateral load of the tailless aircraft is mainly affected by the static stability of steering direction, the rudder steering efficiency and the lateral force coefficient Side slip angle derivative; yaw damping derivative basically does not affect the lateral flight load. At the same time, the validity of the method is also verified, which is of guiding significance to improve the calculation accuracy of the flight load.