具有结构阻尼的复合材料薄壁梁的动力失速非线性颤振特性  

Stall nonlinear flutter behavior of a thin-walled composite beam with structural damping

作　　者：任勇生[1] 刘廷瑞[1] 

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266510

出　　处：《振动与冲击》2013年第18期146-152,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(10972124;11272190);山东省教育厅科技计划(J08LB04);山东省自然科学基金(ZR2011EEM031)资助项目

摘　　要：研究具有结构阻尼的复合材料薄壁梁动力失速非线性颤振特性。采用受ONERA非线性气动力作用的复合材料薄壁梁的气弹模型分析非线性气弹稳定性;采用复合材料薄壁梁的模态阻尼分析模型进行结构阻尼预测,复合材料结构阻尼对复合材料薄壁梁气弹系统稳定性影响通过引入比例阻尼矩阵的方式予以考虑。采用Galerkin法对具有结构阻尼的气弹方程进行离散化,同时利用片条理论对非线性广义气动力进行计算。借助特征值方法及时域积分法分析复合材料薄壁梁非线性颤振边界及气弹响应的稳定性。通过数值分析,揭示复合材料结构阻尼、纤维铺层角对复合材料薄壁梁非线性颤振边界影响。结果表明,结构阻尼用于抑制复合材料薄壁梁的动力失速非线性颤振,增强气弹稳定性,具有十分明显作用效果。The effect of structural damping on aeroelastic stability was investigated for a composite thin-walled beam. The aeroelastic model of the composite thin-walled beam under action of ONERA aerodynamic force was adopted to study its aeroelastic stability. The structural damping of the beam was predicted based on the analytical formulas of the modal damping of the thin-walled composite beam. The effect of the structural damping on the aeroelastic stability of the beam was taken into account by using a proportional damping matrix. By means of Galerkin＇ s method, the nonlinear aeroelastic equations considering the structural damping were discretized into ordinary equations. The generalized aerodynamic forces were obtained with the strip theory. The stability characteristics were investigated through eigenvalue analysis and time domain integration. The effects of the structural damping of composite material and fiber orientation on the nonlinear flutter characteristics of the composite thin-walled beam were obtained with numerical calculations. The results showed that using the structural damping of the thin-walled composite beam described here, a significant enhancement of the aeroelastic stability of the beam can be achieved.

关 键 词：复合材料薄壁梁 复合材料阻尼 非线性气弹 失速颤振 

分 类 号：TH11[机械工程—机械设计及理论]