摘要
影响转子临界转速的因素很多,支承系统的刚度是其中的一个。本文采用有限元法,通过在Ansys软件中建立某微型燃气轮机支承系统的三维有限元模型,分析其静刚度和动刚度值。然后以其透平转子为例,考察支承系统的刚度值对其临界转速的影响。计算结果表明,与仅考虑轴承的刚度相比,同时考虑支承系统刚度的情况下,透平转子的临界转速下降了约40%。
The stiffness of a rotor＇s supporting system is one of the factors that impact it＇s critical speed. Based on the finite element method, the 3D finite element model of the supporting system of a micro turbine is created in ansys, to be used to ana- lyze its static stiffness and dynamic stiffness. Subsequently, taking the turbine rotor for instance, the study focuses on the effect of stiffness of its supporting system on its critical speed. The calculation result shows that the critical speed of the turbine rotor declines by some forty percent, due to the existence of the stiffness of its supporting system, compared with just considering the stiffness of its bearing.
出处
《机电设备》
2012年第5期46-49,共4页
Mechanical and Electrical Equipment
关键词
转子
临界转速
有限元法
支承系统
支承刚度
rotor
critical speed
finite element method
supporting system
supporting stiffness
