Effect of a Nonlinear Energy Sink on the Nonlinear Panel Flutter Suppression Under Variable Temperature Rise and Airflow Yawed Angle

Abstract

This study investigates the nonlinear aeroelastic response behaviors and robustness of a square isotropic panel with a nonlinear energy sink (NES) considering temperature rise and airflow yawed angle. Considering uniform temperature rise, the nonlinear aerothermoelastic equations for a three-dimensional (3D) isotropic panel with an NES were derived using the von Karman large deformation theory and the piston theoretical aerodynamic force with airflow yawed angle and then discretized using the Galerkin method. The fourth-order Runge–Kutta method was used to solve the aerothermoelastic equations for the panel response, and the effect of temperature rise and airflow yawed angle on the NES suppression ability was examined. The numerical results revealed the appearance of a buckling region due to the temperature rise; however, the NES had no impact on the boundary of this region. The suppression ability of the NES gradually weakened and disappeared completely as temperature increased. Furthermore, within a small angular range, the NES suppression ability increased with the increasing airflow yawed angle. For a large airflow yawed angle, the NES not only lost its suppression ability but also made the panel aeroelastic response worse.