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The changes of critical angular velocity as a diagnostic symptom of rotating composite shaft

机译：临界角速度的变化作为旋转复合轴的诊断症状

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摘要

The purpose of this work is to show an influence of interlayer separations on dynamic behaviour of simple laminated elements of hybrid composite structures. The influence of position and varying size of imperfection on the critical frequencies is examined using variational methods. The shaft is treated as a thin-walled composite cylindrical shell of given geometry consisting of an even number of equal thickness orthotropic layers symmetrically cross-ply arranged about its midsurface. The Kirchhoff hypothesis on nondeformable normal element is assumed. Rotary and coupling inertias are neglected. The motion of the shell is compound of a rotary motion with a constant angular velocity Ω and the relative motion described by vector components u, v, w in tangential, circumferential, and radial direction, respectively. The delamination of constant width is parallel to the shell reference surface and it covers the entire circumference. The edge delamination is modeled by changing the effective reduced stiffnesses of debonded parts. The stabilizing effect of external damping and destabilizing effect of internal damping are taken into account in the dynamic stability analysis. The critical parameter depends on the relative delamination length and the relative radial position. It is seen that the delamination length is mainly responsible for the decrease of the critical parameter.
机译：本作作品的目的是展示层间分离对混合复合结构简单层压元件的动态行为的影响。使用变分方法检查位置和变化缺陷大小对临界频率的影响。轴被视为给定几何形状的薄壁复合圆柱形壳体，其由均匀的均匀厚度的均匀厚度分子层组成，对称地布置在其沿脑面上。假设在非全形态元素上的Kirchhoff假设。忽略旋转和耦合惯性。壳体的运动是旋转运动的化合物，其具有恒定角速度ω和由载体元件U，v，W在切向，周向和径向方向上描述的相对运动。恒定宽度的分层平行于壳体参考表面，并且它覆盖整个圆周。边缘分层通过改变剥离零件的有效减少的刚度来建模。在动态稳定性分析中考虑了内阻外部阻尼和破坏稳定效应的稳定效果。临界参数取决于相对分层长度和相对径向位置。可以看出，分层长度主要负责临界参数的减少。

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