摘要
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,并对波音737客机水平尾翼的复合材料安定面结构进行了模拟研究,从复杂的计算及合理的结论可以看出,所提出的方法对于这类十分复杂复合材料结构的非平稳随机振动分析十分有效。
An efficient and accurate non-stationary random vibration algorithm for the composite laminated structures attached with viscoelastic damping layer is proposed. Both the Adams damping of the composite laminated structures and the attached frequency-dependant damping are taken into account in the analysis. For the resulting non-classically damped and frequency-dependant complex system, in combination with the realmode-based degree-reduction scheme, the pseudo excitation method is developed and the precise integration method is applied to solve the reduced non-stationary random vibration equation. The combined algorithm is implemented on the DDJ software system. A composite horizontal tail of the Boeing737 aircraft structure is 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.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2007年第1期100-105,共6页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(10272025
10472023)
关键词
复合材料
虚拟激励法
精细积分法
非平稳随机振动
依赖频率阻尼
composite
pseudo excitation method
precise integration method
non-stationary random vibration
frequency-dependant damping
