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Dynamic behaviour of the Laval rotor with a transverse crack

机译:拉瓦尔转子横向裂纹的动力学行为

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This paper presents an introduction to the dynamic behaviour of a one disc rotor (Laval rotor) having a transverse crack in the elastic shaft. With the aid of a simple crack model the non-linear equations of motion are derived. Due to the weight dominance in the elastic deflection of the horizontal shaft the equations can be simplified to linear but time-variant equations. The stability analysis is carried out with Floquet's method and the results are presented in an overview diagram. The forced vibrations due to crack and unbalance are discussed in much detail. The orbit decomposition into forward and backward whirls (two-sided spectral order analysis) turns out to be a helpful tool for the understanding the complicated dynamic phenomena. Some hints for crack detection are given.
机译:本文介绍了在弹性轴上具有横向裂纹的单盘转子(拉瓦尔转子)的动力学行为。借助于简单的裂纹模型,得出了非线性的运动方程。由于水平轴弹性挠度中的重量占优势,因此可以将方程简化为线性但随时间变化的方程。稳定性分析采用Floquet方法进行,结果在总览图中显示。将详细讨论由于裂纹和不平衡引起的强制振动。轨道分解为前向和后向旋转(双向频谱阶次分析)被证明是了解复杂的动力学现象的有用工具。给出了一些裂纹检测的提示。

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