摘要
以100000r/min超高转速氦气压缩机转子为研究对象,描述了基于ANSYS对转子进行了模态分析的步骤和结果,得到转子的各阶弯曲临界转速和振型图。采用多点激振单点拾振的测试方法对转子模态进行实验验证对比,模态分析与实验结果相对误差为1.95%,ANSYS模态分析计算基本准确,可以有效地指导转子特征尺度的设计。实验测试表明,最高工作转速相对于临界转速的安全裕度为18%,转子处于相对安全的工作范围,可有效避免弯曲共振的发生。并进一步分析了轴承支承刚度和工作轮端轴伸长度对临界转速的影响。在一定范围内,适当增大轴承的支承刚度,可较大程度提高转子临界转速;适当减小轴伸长度,可略微增加转子临界转速。
In order to improve the reliability of large-scale cryogenic projects, a new type of oil-free helium compressor technology is proposed, based on high speed centrifugal compression. So the stability of the high-speed rotor should be solved firstly. This paper studies on modal analysis of the rotor of an ultra-high speed helium compressor operating at about 100,000 r/min. The steps and results of modal analysis of the rotor based on ANSYS are described. The critical speed and vibration patterns of the rotor are obtained. The test method of multi-point excitation single point pickup was used to verify the rotor mode. The relative error between the modal analysis and the experimental results is 1.95%. The ANSYS modal analysis calculation is more accurate and can be effectively used on the design of the rotor characteristic scales. The test results show that the safety margin of the maximum operating speed relative to the critical speed is 18%. The rotor is in a relatively safe working range and can effectively avoid the occurrence of bending resonance. The influence of bearing stiffness and shaft extension length on critical speed is further analyzed. The critical speed of rotor can be greatly increased by increasing the bearing’s bearing stiffness within a certain range. The critical speed of the rotor can be slightly increased by appropriately reducing the shaft length.
作者
杨伟茂
胡忠军
王炳明
龚领会
Yang Weimao;Hu Zhongjun;Wang Bingming;Gong Linghui(Chinese Academy of Sciences Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《低温工程》
CAS
CSCD
北大核心
2019年第3期14-19,共6页
Cryogenics
关键词
高速转子
氦气压缩机
模态分析
临界转速
high-speed rotor
helium compressor
modal analysis
critical rotational speed
