摘要
转子的动力特性受到很多因素的影响,其中,支承系统的刚度是一个重要因素。通过在有限元分析软件ANSYS中建立某小型燃气轮机支承系统的三维有限元模型,分析了其静刚度和动刚度。以该燃气轮机的压气机转子为例,文中考察了支承系统的刚度对其临界转速和稳态不平衡响应的影响。计算结果表明,与仅考虑轴承的支承刚度相比,同时考虑支承系统刚度的情况下,压气机转子的第一阶临界转速下降了约54%,其第一级叶轮的稳态不平衡位移响应的峰值下降了56.9%。
The stiffness of a rotor supporting system is one of the factors that i MPact itg dynamic characteristics, The 3D finite element model of the supporting system of a small turbine is created by the software ANSYS for analyzing its static stiffness and dynamic stiffness. Subsequently, taking the compressor rotor of the small turbine as an example, the effect of the gas turbine supporting system stiffness on its critical speed and steady-state unbalance response is in- vestigated. The calculation results reveal that the first order critical speed of the compressor rotor declines by some 54% , and the peak value of the steady-state unbalance displacement response declines by 56.9% , due to the existence of the stiffness of its supporting system, and in comparison with only considering the support stiffness of its bearings.
出处
《机械设计与研究》
CSCD
北大核心
2012年第4期18-21,25,共5页
Machine Design And Research
关键词
转子
支承系统
支承刚度
临界转速
稳态不平衡响应
rotor
supporting system
support stiffness
critical speed
steady-state unbalance response
