摘要
对一种新型多级同轴空气透平膨胀机进行了转子动力学研究,利用ANSYS建立了转子轴承系统临界转速的理论计算模型,使用半联轴器等效了减速器高速轴的影响,并通过大量升速实验验证了计算结果。研究结果显示该空气透平额定转速位于一阶和二阶临界转速之间,其实际一阶临界转速为18 600r/min,理论计算结果和实验结果误差为2.9%;计算了不同轴承刚度下转子轴承系统的固有频率,并通过转子振型图分析了一阶和二阶临界转速下最大振幅处的位置,为转子的设计提供了理论依据。
The rotor dynamics study of a multi-stage coaxial air turbine expander was implemented, including making use of Ansys to establish a theoretical calculation model for critical speed of the rotor-bearing system and analyzing the effect of replacing reducer＇ s high-speed shaft with a half coupling as well as verifying both theoretical analysis and calculation results through experiments. Results show that this air turbine expander＇ s rated speed stays between the first and second order critical speeds; and the first order critical speed from the experiment is 18 600r/min with 2.9% error as compared to the theoretical calculation result. Calculating the rotor＇ s natural frequencies under different bearing stiffness and having the rotor＇ s variation mode based to an- alyze locations of the maximum vibration amplitude for the first and the second order critical speeds can pro- vide the theoretical basis for the rotor design.
出处
《化工机械》
CAS
2016年第2期174-177,共4页
Chemical Engineering & Machinery
基金
中国科学院低温工程学重点实验室开放课题资助项目(Y0AS011104)
关键词
空气透平膨胀机
临界转速
轴承刚度
转子振型
air turbine expander, critical speed of rotation, bearing stiffness, mode of rotor vibration
