碟式分离机支撑条件对转子系统动力学特性影响

Influence of Support Conditions of Disc Separator on Dynamic Characteristic of Rotor System

为保证蝶式分离机转子系统的稳定性,笔者基于有限元分析软件ANSYS分析转鼓内离心载荷、支承位置与支承刚度对碟式分离机动力学特性的影响,研究固有特性、模态频率和相应振型的变化规律。结果表明:转鼓内流体离心载荷对转子刚度产生显著影响,进而导致各阶模态变化趋势各异;支撑位置和支撑刚度对转子不同阶模态的影响趋势与相应振型有关,当转子部件变形不一致时,部分阶数模态频率可能随支撑位置上移而减小;转子振型在支承位置的径向振幅明显时,支撑刚度对模态频率产生显著影响。研究结果可用于碟式分离机转子系统的设计与优化。

In order to ensure the stability of the rotor system of the disc separator,author analyzed the influence of the centrifugal load in the drum,support position and support stiffness on the mechanical characteristics of disc separator based on ANSYS,and studied the change rule of the inherent characteristics,modal frequency and the corresponding mode shape. The results show that the centrifugal load of the fluid in the drum has a significant effect on the rotor stiffness,which leads to different trends of the modes. The influence tendency of support position and stiffness on different modes of rotor is related to corresponding modes. When the deformation of the rotor components is not consistent,the frequency of some order modes may decrease with the support position moving up. And when the radial amplitude of the rotor mode at the support position is obvious,the support stiffness has a significant impact on the modal frequency. The results can be used for the design and optimization of rotor system of disc separator.