对定常空气动力作用下、含立方非线性刚度的二元机翼颤振系统的分叉点进行了研究．应用中心流形理论将四维系统降为二维系统，并采用形式级数判别法对分叉点的类别及稳定性进行了分析 The bifurcation point of the binary flutter system with cubic nonlinear stiffness under constant aerodynamic force is studied. The application of manifold theory reduces the four-dimensional system to a two-dimensional system, and analyzes the classification and stability of the bifurcation points by using formal series discriminant method