支承参数对转子临界转速的影响研究

Research on Effects of Support Parameters on the Rotor Critical Speed

以某转子为研究对象,基于有限元分析软件ANSYS建立该转子的临界转速,计算有限元模型。通过固定其他支承参数逐渐改变支承主刚度与主阻尼的方式,对该转子进行临界转速计算,获得采用不同支承参数的转子临界转速。分析了转子临界转速随支承主刚度与主阻尼的变化规律,结果表明:支承主刚度小于200 GN/m时,该转子的各阶临界转速随主刚度的变大而升高的趋势明显,支承主刚度大于200 GN/m时,继续增大主刚度对该转子临界转速的影响较小;支承主阻尼在一10~10 MN·s/m内取值,对转子临界转速无明显影响。分析结果可为该转子的设计提供参考。

Taking a rotor as the research object,a finite element model of the rotor is created by the software ANSYS for calculating its critical speed.By changing the main support stiffness and the main damping gradually and remaining other support parameters the same,the calculations of the rotor critical speed are performed under different support parameters.The regularity about the main support stiffness and the main damping working on the rotor critical speed is investigated.The analysis results show that when the main support stiffness is less than 200 GN/m,the rotor's critical speeds increase obviously with the main support stiffness becoming larger.When the main support stiffness is more than 200 GN/m,continuing to increase the main support stiffness has little effect on the rotor critical speed.When the main damping is within the range of-10~10 MN·s/m,it has no obvious effect on the rotor critical speed.In this paper,the results can provide references for the design of the rotor.