敷设黏弹性阻尼层的复合材料结构非平稳随机振动分析

提出了对敷设黏弹性阻尼层的复合材料层合结构非平稳随机振动分析的高效精确算法.考虑了黏弹性阻尼材料对激振频率的依赖性及Adams提出的复合材料层合结构的阻尼模型.为解决依赖频率变化的非经典阻尼的复杂结构,结合实模态降阶直接解法对虚拟激励法做了相应的发展,并采用精细积分法高效精确地求解了随机振动方程.以国产有限元程序系统DDJ为平台开发了相应的程序,并对某飞机的水平尾翼的复合材料安定面结构进行模拟研究,从复杂的计算及合理的结论可以看出,本文中所提出的方法对于这类十分复杂复合材料结构在航空领域的非平稳随机振动分析十分有效.

Non-stationary Random Vibration Analysis of Composite Laminated Structures Attached with Frequency-dependant Damping Layer

An efficient and accurate non-stationary random vibration algorithm for the composite laminated structures attached with viscoelastic damping layer was proposed. Both the Adams damping of the composite laminated structures and the attached frequency-dependant damping were taken into account in the analysis. For the resulting non-classically damped and frequency-dependant complex system, in combination with the real-mode-based degree-reduction scheme, the pseudo excitation method was developed and the precise integration method was applied to solve the reduced non-stationary random vibration equation. The combined algorithm was implemented on the DDJ software system. A composite horizontal tail of an aircraft structure was computed and studied. Such complex computations and the reasonable results show that the proposed method is quite useful for the analysis and design of these kinds of complex composite structures in the aeronautic fields.