离心机转子的稳定性试验研究

An Experimental Study on the Stability of a Centrifuge Rotor

本文对部分充有无粘不可压缩液体的离心机转子系统稳定性问题作了试验研究.首先给出了转子动力学和旋转流体动力学相互耦合的系统振动方程,然后用试验方法验证了理论分析所得到的失稳边界.由穿越失稳区的三维转速谱阵图可以清楚地看到转子失稳振动的变化过程和失稳涡动频率等特征,从而为理论分析提供了良好的试验佐证.

In this paper the stability of a centrifuge rotor partially filled with an inviscid,incompressible liquid is analyzed experimentally.The vibration equa-tions of the system,which are the combined equations of the rotor dynamics and the fluid dynamics,are given here.The unstable boundaries obtained by the num-erical method are verified in the experiment.The variable process of the unstable vibration and the unstable whirl frequency can be clearly seen in the spectral map versus rotating speed of the rotor when it runs down through the unstable region. This test supplies good verification for the theoretical analysis.