Vibration and stability of micro-scale cylindrical shells conveying fluid based on modified couple stress theory

Vibration and stability of micro-scale cylindrical shells conveying fluid based on modified couple stress theory
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基于修正力偶应力理论的微尺度圆柱壳输送流体振动与稳定性

DOI:
10.1049/mnl.2012.0184
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发表时间:
2012-07
期刊:
Micro & Nano Letters
影响因子:
--
通讯作者:
Wang, Lin
Wang, Lin
中科院分区:
其他
文献类型:
--
作者:
Zhou, Xinping;Wang, Lin

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本文利用修正偶应力理论建立的微尺度简支输流圆柱壳的振动方程,分析了弹性介质中微尺度简支输流圆柱壳的振动特性。结果表明,所建立的模型预测的固有频率具有尺寸依赖性,并随流体流速和弹性介质参数的变化而变化。当特征半径尺寸与材料长度尺度参数相当时,显示出尺寸依赖性,但随着特征尺寸的增加而减小。壳体内的流体也被发现有助于急剧降低固有频率。
Vibration characteristics of micro-scale simply supported cylindrical shells conveying fluid and embedded in an elastic medium are analysed using the new equations of motion developed based on the modified couple stress theory. It is found that the natural frequencies predicted by the established model are size-dependent, and change with the fluid flow velocity and elastic medium parameter. The size dependence is shown when the characteristic radius size is comparable with the material length-scale parameter, but decreases with the increase in characteristic size. The fluid inside the shell is also found to help in decreasing natural frequency sharply.
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