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针对大展弦比柔性飞机阵风响应问题,考虑在大攻角(AOA)情况下气动力非线性的影响,通过将修正的Theodorsen方法与片条理论相结合,得到非线性的时域非定常气动力;在此基础上,建立阵风干扰下的大展弦比柔性飞机非线性气动弹性模型,完整地发展了一种新颖的可考虑气动力非线性的大展弦比柔性飞机阵风响应分析方法.结合算例模型开展方法验证和数值仿真,对比翼尖和质心(CG)处阵风附加过载在线性和非线性情况下的变化.算例结果表明,考虑大攻角情况下的气动力非线性后,大展弦比飞机的阵风响应较线性情况有明显变化,翼尖处的阵风附加过载最多可减少41.7%,气动力非线性的影响不可忽视.
Aiming at the gust response of large flexible aircraft with large aspect ratio, considering the influence of nonlinear aerodynamic force at large angle of attack (AOA), a nonlinear time-domain unsteady gas is obtained by combining the modified Theodorsen method with the theory of slice. On the basis of this, a nonlinear aerodynamic model of large aspect ratio flexible aircraft with gust disturbance is established, and a novel gust response analysis method of large aspect ratio flexible aircraft considering aerodynamic nonlinearity is developed. A numerical example is given to verify the effectiveness of the proposed method and to compare the additional gust winds at the tip and center of mass (CG) under both linear and non-linear conditions.Experimental results show that, considering the non-linear aerodynamic forces , The gust response of aircraft with large aspect ratio obviously changed compared with the linear one. The additional gust wind load at wingtip can be reduced by up to 41.7%, and the influence of aerodynamic nonlinearity can not be neglected.