摘 要:为了完善在夹层壁板的芯层安装微型动力吸振器来抑制壁板颤振这一新方案,研究了吸振夹层壁板中悬臂梁式动力吸振器的频率设计方法。基于壁板颤振的模态耦合机理,分别以单频率设计和双频率设计原则来确定吸振夹层壁板的吸振器频率。结果表明,所有微型吸振器按单频率设计时,存在一个不等于原夹层壁板颤振耦合模态频率和颤振频率的吸振器最佳设计频率,使得吸振夹层壁板的颤振速度最大;微型吸振器按双频率设计时,吸振夹层壁板的最大颤振速度远大于按单频率设计的最大颤振速度。
Abstract: A novel scheme for panel flutter suppression is proposed by the authors of this article. In this scheme the panel is designed as a sandwich panel incorporated with distributed micro beam-type dynamic absorbers acting as its core layer. To improve this scheme, the frequency design method for the dynamic absorber is investigated in the present study. Based on the mode-coupling mechanism of panel flutter, the frequency design of dynamic absorber is performed according to the single-frequency design scheme and double-frequency design scheme respectively. Numerical simulation results show that when all the micro dynamic absorbers are designed with single-frequency design scheme, a maximum flutter speed for the sandwich panel can be achieved at the optimal absorber frequency, which is different from the flutter frequency or the natural mode frequencies of the original sandwich panel; and when the micro dynamic absorbers are designed with double-frequency design scheme, a maximum flutter speed of the sandwich panel which is much bigger than that obtained by single-frequency design scheme can be achieved.