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系统参数对碰摩转子稳态响应的影响 总被引:1,自引:0,他引:1
本文基于线性碰摩力模型,分析了转定子存在偏心时柔性JEFFCOTT转子的碰摩响应。通过数值仿真,揭示了转子碰摩响应与系统参数之间的定性关系,指出较小的定子刚度、较大的系统阻尼有利于抑制转子的混沌振动。 相似文献
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Experimental and Theoretical Research on the Vibrational Gaps in Two-Dimensional Three-Component Composite Thin Plates 下载免费PDF全文
We investigate the vibrational band gaps in a thin plate of two-dimensional phononic crystals with the locally resonant structure in theory and experiment. The experimental sample is optimized based on the simple analytical model. The experimental results are in good agreement with the theoretical calculation by the finite element method. The findings will be significant for applications of phononic crystals in the field of vibration isolation. 相似文献
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Based on a better understanding of the lattice vibration modes, two simple
spring--mass models are constructed in order to evaluate the frequencies on both the
lower and upper edges of the lowest locally resonant band gaps of the ternary
locally resonant phononic crystals. The parameters of the models are given in a
reasonable way based on the physical insight into the band gap mechanism. Both the
lumped-mass methods and our models are used in the study of the influences of
structural and the material parameters on frequencies on both edges of the lowest
gaps in the ternary locally resonant phononic crystals. The analytical evaluations
with our models and the theoretical predictions with the lumped-mass method are in
good agreement with each other. The newly proposed heuristic models are helpful for
a better understanding of the locally resonant band gap mechanism, as well as more
accurate evaluation of the band edge frequencies. 相似文献