借助MDO平台ISIGHT集成NASTRAN与MATLAB,提出了一种大展弦比机翼几何非线性气动弹性分析方法。首先计算机翼的非线性静气动弹性平衡位置,并在此位置进行线化动力学分析,求出结构的振动模态和频率;采用线性小扰动非定常气动力理论和P-K法求出对应的颤振速度;通过设定收敛指标最后得到结构的非线性颤振特性。与线性计算结果进行对比表明,几何非线性对大展弦比机翼的模态及颤振特性具有较大影响,因此,在此类机翼的设计过程中必须进行非线性气动弹性分析。 With ISIGHT integration of NASTRAN and MATLAB, an aeroelastic analysis method of large aspect ratio wing is proposed. Firstly, the nonlinear static-air-spring elastic equilibrium position of the wing is calculated, and the linear dynamic analysis is performed at this position to obtain the vibrational modes and frequencies of the structure. The linear perturbation unsteady aerodynamic theory and the PK method are used to find the corresponding vibration Vibration velocity; finally, the nonlinear flutter characteristics of the structure are obtained by setting the convergence index. The comparison with the linear calculation results shows that the geometric nonlinearity has a great influence on the modal and flutter characteristics of large aspect ratio airfoils. Therefore, the nonlinear aeroelastic analysis must be performed in the design of such airfoils.