整体齿轮增速式离心压缩机振动耦合动力特性研究

The dynamic properties of a coupling vibration in an integrally geared centrifugal compressor

以一台在役的六级整体齿轮增速式离心压缩机为研究对象,基于转子动力学和齿轮动力学理论,建立了全自由度齿轮-轴承-转子耦合系统有限元模型。计算了考虑齿轮啮合接触的转子系统固有频率、模态振型和不平衡响应,得出了这种复杂轴系的模态特征与振动传递特性。在此基础上,研究了不同支撑型式下转子振动响应特性,并探讨了齿轮螺旋角对转子振动的影响。研究结果表明,耦合轴系的固有频率和不平衡响应峰值都有所增大;转子系统在可倾瓦轴承支撑下,无论过临界还是工作转速振动幅值均较低;当齿轮螺旋角为15°时,转子振动幅值最小。

A six-stage integrally geared centrifugal compressor has been studied. Based on the theories of rotor and gear meshing dynamics,a full degree of freedom gear-bearing-rotor finite element model of the coupling system was established. The natural frequencies and mode shapes were calculated and its unbalance responses were analyzed,leading to a description of the complex modal and vibration transmission properties of the shafts. On this basis,the unbalance responses of rotors under the support of different bearings were investigated. The impact of helix angle on the rotor vibrations is discussed. The result indicated that the natural frequency and unbalanced peak of the coupling centrifugal compressor are increased. Rotors supported by tilting pads crossing either the critical or the operating speed had a lower vibration. The minimum vibration of the rotor was found at a gear helix angle of 15 degrees for this compressor.