The flutter of a thin flexible plate in uniform flow is an interesting theoretical problem in fluid–structure interaction phenomena, as well as an important engineering problem. Therefore, understanding of the instability mechanism is crucial to preventing fatal defects caused by the flutter. In this study, the instability mechanism of a flexible plate in three-dimensional uniform flow is investigated in terms of the energy transfer between the plate motion and fluid flow. A theoretical aerodynamic model of the plate is developed using the unsteady lifting surface theory and linear beam theory. The aerodynamic stability of the plate is investigated by eigenvalue analysis. The developed model is validated by comparison with previous experimental results and other theoretical models. Furthermore, to understand the instability mechanism, the work done by the fluid force on the plate surface is determined, and its influence on the stability of the system is examined.

均匀流动的柔性薄板颤振是流固耦合现象中一个有趣的理论问题，也是一个重要的工程问题。因此，了解不稳定性机理对于防止由颤动引起的致命缺陷至关重要。在这项研究中，从板运动和流体之间的能量传递角度研究了柔性板在三维均匀流中的失稳机理。利用非定常升力面理论和线性梁理论建立了板的理论空气动力学模型。通过特征值分析研究了板的空气动力学稳定性。通过与先前的实验结果和其他理论模型进行比较来验证所开发的模型。此外，要了解不稳定机制，