摘要
为研究频率漂移现象,对两块不同形状的铝蜂窝夹层板在不同量级下进行随机振动试验,发现固有频率随激振量级增加下移。对可产生频率漂移原因进行了分析,排除了试件损坏及试验条件导致的原因。同时,引入混沌理论,计算出振动数据的最大Lyapunov指数大于零,证明振动中存在混沌现象,证实蜂窝板中的非线性是导致频率漂移的主要原因。
Natural frequency decrease phenomenon in random vibration test of difform aluminum honeycomb sandwich board in different test datum was analyzed, no internal breakage was proved. Meanwhile, the largest Lyapunov exponent of test data is larger than zero. The possibility of the presence of chaotic behavior in the time-series data is explored. The non- linear is the main causation of natural frequency decrease is proved.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第2期463-467,共5页
Journal of Astronautics
基金
863计划(2007AA702202)
关键词
非线性时间序列
混沌
频率漂移
铝蜂窝板
随机试验
Nonlinear time series
Chaotic behavior
Natural frequency decrease
Aluminum honeycomb sandwich board
Random vibration test
