Recent works have addressed piezoelectrically induced stresses as a potential technique for aeroelastic stability augmentation of biclamped structures. Because active-control-based techniques are conventionally used for aeroelastic stabilization, this paper presents a comparative study on the effectiveness of piezoelectrically induced stresses and active control for aeroelastic stability augmentation. A finite-element-method-based piezoaeroelastic model is proposed employing two-node, eight-degree-of-freedom smart beam elements and an unsteady, strip-theory-based aerodynamic approach involving vertical gust components. A stability augmentation system was designed for stiffness control and used for comparison in a particular wing configuration. Analyses involving the stability margins, input signal energy, and the response to vertical gust were performed and discussed. The results showed that piezoelectrically induced stresses and active control can provide equivalent flutter speed increase for the two cases of gain margin considered. However, the system can become unstable due to control signal saturation when submitted to high-amplitude gusts, which was not observed when piezoelectrically induced stresses is used. On the other hand, it was observed that the active control required a much smaller amount of energy for stabilization. In general, it was noticed that the piezoelectrically induced stresses technique was not as effective as active control to increase the flight envelope of biclamped structures, because active control can provide equivalent aeroelastic stability improvement with smaller amount of energy. However, it is found to be a promising strategy to be used on emergency devices, where the aeroelastic stability of biclamped structures needs to be guaranteed in critical aerodynamic disturbance conditions.

最近的工作已经将压电诱导应力作为一种潜在的技术来增强双夹结构的气动弹性稳定性。由于基于主动控制的技术通常用于气动弹性稳定，本文对压电诱导应力和主动控制对气动弹性稳定性增强的有效性进行了比较研究。提出了一种基于有限元方法的压电气动弹性模型，该模型采用两节点、八自由度智能梁单元和非稳态、基于条带理论的空气动力学方法，涉及垂直阵风分量。稳定性增强系统设计用于刚度控制，并用于在特定机翼配置中进行比较。分析涉及稳定裕度、输入信号能量、并对垂直阵风的响应进行了讨论。结果表明，压电诱导应力和主动控制可以为考虑的两种增益裕度提供等效的颤振速度增加。然而，当受到高振幅阵风时，系统可能会由于控制信号饱和而变得不稳定，这在使用压电诱导应力时没有观察到。另一方面，据观察，主动控制需要更少的能量来稳定。总的来说，人们注意到压电诱导应力技术在增加双夹结构的飞行包线方面不如主动控制有效，因为主动控制可以用较小的能量提供等效的气动弹性稳定性改进。然而，