中文摘要：

研究叶尖气隙和滚动轴承共同作用下轴流压缩机的非线性动力特性及稳定性。采用有限元法和非线性滚动轴承模型,建立压缩机转子系统动力学模型,其中转子旋转时非均匀分布叶尖气隙引起的气动失稳力（即Alford力）根据已有实验数据和计算模型求得。通过计算分析发现叶尖气隙和滚动轴承分别激起系统的反进动和正进动共振频率,其共同作用造成压缩机转子系统的失稳,很好地解释了已有实验中出现的失稳现象。表明滚动轴承反力和Alford力的共同作用对压缩机转子系统的动力性能和稳定性有显著影响。

英文摘要：

This article investigates the nonlinear dynamic characteristics and stability of an axial flow compressor with tip clearance and ball bearings.The compressor rotor system is modeled with the aid of the finite element technique and a nonlinear ball bearing model.The aerodynamic destabilizing forces,i.e.,the Alford forces,induced by the nonuniform tip clearance when the rotor is whirling,are acquired using known experimental data and a mathematic model.Simulation results show that the Alford forces and nonlinear bearing reactions provoke respectively the emergence of backward and forward resonance frequency components, and induce the system to lose stability. The experimental results are perfectly interpreted by the proposed analysis, which indicates that the combined effect of tip clearance and ball bearings is significant on the dynamic characteristics and stability of the rotor system.