间隙非线性气动弹性系统有非常丰富的动力学特征。由于工程实际中间隙不易准确测量甚至无法测量,通常需要通过辨识来建立其数学模型,其中间隙开关点位置是辨识问题中的难点。本文利用间隙开关点将间隙非线性系统区分为3个线性子系统,用Hammerstein模型表示其非线性部分,构造了开关点的迭代序列;并采用非迭代和迭代相结合的方法进行求解,从而成功获得包含间隙开关点在内的该系统所有模型参数;以间隙非线性的二元翼段为例,验证了该辨识方法的有效性。 Gap nonlinear aeroelastic systems have very rich kinetic characteristics. Due to the fact that the gap in the actual project is not easy to measure or even impossible to measure, it is usually necessary to establish its mathematical model through identification. The location of the gap switch point is a difficult point in the identification problem. In this paper, we use the gap switch points to divide the gap nonlinear system into three linear subsystems, then use the Hammerstein model to represent the non-linear part, and construct the iterative sequence of the switch points. The non-iterative and iterative methods are used to solve the problem. The model parameters of the system, including the gap switch points, are obtained. Taking the non-linear bivariate wing segment as an example, the validity of the proposed method is verified.