摘要
基于Jeffcott转子模型,结合涡轮的经典阿尔福德(Alford)力流固耦合动力学模型,建立了考虑涡轮Alford力的系统运动方程,通过理论分析导出了表征系统动力学性能的模态阻尼与频率、振幅对数衰减率以及动力放大系数等的解析表达式。最后通过图形分析了涡轮Alford力对转子系统动力学性能的影响,给出了一些可用于指导转子系统动力学设计和故障诊断的结论。分析表明,Alford力会促进正向涡动而抑制反向涡动,增大正、反向涡动的模态频率,降低正向涡动的稳定性,而提高或降低反向涡动的稳定性则取决于系统的相对阻尼,增大或减小系统的动力放大系数则取决于比转速,并改变系统响应的相位。
Based on a Jeffcott model, the equations of motion of system were established with the consideration of turborotor＇s Alford force. This was achieved by integrating the Alford force model of a turborotor into the dynamic model of the system. The analytical expressions of modal damping and frequency, logarithmic decrement and dynamic magnification factor, which represent the dynamic properties of the system, were obtained by theoretical analyses. The influences of the Alford force on the dynamic properties of the rotor system were discussed by every variation with figures. It is concluded that the Alford force has significant influences on the dynamic properties of a turborotor system. It promotes forward whirling and suppresses backward whirling, increases the forward and backward whirling modal frequencies, and decreases the forward wh!rling stability. It increases or decreases the backward whirling stability depending on the specific damping. It increases or decreases the dynamic magnification factor depending on the specific rotating speed. It changes the phase angle difference of the system response. These conclusions can be used for guiding the dynamic designs and diagnostics of turborotor systems.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第32期77-82,共6页
Proceedings of the CSEE
基金
国家自然科学基金资助项目(50425516)~~
