戴新进, 林家浩, 陈浩然

提出了敷设粘弹性阻尼层的复合材料层合结构随机振动分析的高效精确算法。考虑了粘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, 精确求解了降阶后的随机振动方程。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复合材料的随机振动分析十分有效。 

Random vibration analysis of the composite laminated structuresattached with frequency2dependant damping layer

An efficient and accurate random vibration algorithm for the composite laminated structures attached with the viscoelastic damping layer is 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, a pseudo excitation method is developed to solve the reduced random vibration equation. The combined algorithm has been implemented on the DDJ software system. A composite horizontal tail of the Boeing737 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 composite structures.