轴承刚度对涡旋压缩机转子系统振动特性的影响研究

Study on the Influence of Bearing Stiffness on the Vibration Characteristics of Scroll Compressor Rotor System

  • 摘要: 针对某立式涡旋压缩机转子不平衡质量引起的转子系统振动过大问题,利用力与力矩平衡方程对转子系统进行动平衡设计。运用ANSYS WorkBench有限元分析软件对该样机转子系统进行数值仿真,研究了轴承刚度对转子系统临界转速的影响,利用Design Explorer进行轴承刚度响应面优化及DOE实验计算。研究结果表明,轴承刚度与转子系统临界转速及固有频率呈正相关,且轴承刚度的变化对转子系统一阶临界转速的影响最大,对轴承刚度在1.0×107 N/m~1.0×108 N/m范围内进行响应面优化,采用轴承刚度值优化候选点1,得到避免共振最优的临界轴承刚度值,为优化涡旋压缩机转子系统振动特性提供了参考。

     

    Abstract: In order to solve the problem of excessive vibration of the rotor system caused by the unbalanced mass of the rotor of a vertical scroll compressor, the dynamic balance design of the rotor system was carried out by using the balance equation of force and torque. ANSYS WorkBench finite element analysis software was used to simulate the rotor system of the prototype, the influence of bearing stiffness on the critical speed of the rotor system was studied, and Design Explorer was used to optimize the response surface of the bearing stiffness and calculate the DOE experiment. The results show that the bearing stiffness is positively correlated with the critical speed and natural frequency of the rotor system, and the change of bearing stiffness has the greatest impact on the first-order critical speed of the rotor system, and the response surface of the bearing stiffness is optimized in the range of 1.0×107 N/m~1.0×108 N/m, and the bearing stiffness value is used to optimize candidate point 1 to obtain the optimal critical bearing stiffness value to avoid resonance, which provides a reference for optimizing the vibration characteristics of the scroll compressor rotor system.

     

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