In this study, a practical method is proposed to predict the two-degree-of-freedom (2DOF) post-flutter behavior of a 5:1 rectangular section. For this method, a hybrid strategy in the time–frequency domain is introduced to obtain the time-history solution of the nonlinear coupled oscillator, and the nonlinear unsteady aerodynamic forces, described by the amplitude-dependent flutter derivatives, are considered as well as the other nonlinearities of the section model system, i.e., damping and stiffness. Moreover, wind tunnel tests are performed to validate the effectiveness of the proposed method. The numerical results show that the system may exhibit limit cycle oscillation (LCO) due to the aerodynamic and/or damping nonlinearities. Finally, this method is applied to predict the aeroelasticity of a continuum model and to analyse the parameter sensitivity.

在这项研究中，提出了一种实用的方法来预测 5:1 矩形截面的二自由度 (2DOF) 后颤振行为。对于这种方法，引入了时频域中的混合策略来获得非线性耦合振荡器的时程解，并考虑由振幅相关颤振导数描述的非线性非定常气动力以及截面模型系统的其他非线性，即阻尼和刚度。此外，进行风洞试验以验证所提出方法的有效性。数值结果表明，由于空气动力学和/或阻尼非线性，系统可能会表现出极限循环振荡（LCO）。最后，