负荷对整体齿轮增速式离心压缩机转子系统动力学特性的影响研究  

The Research of the Rotor System Dynamics of an Integrally Geared Centrifugal Compressor Due to External Loads

作　　者：丁端[1] 王维民[1] 刘宾宾[1] 姜兴安 Ding Duan Wang Wei-min Liu Bin-bin Jiang Xing-an(Beijing University of Chemical Technolog)

机构地区：[1]北京化工大学,北京100029

出　　处：《风机技术》2016年第4期22-27,共6页Chinese Journal of Turbomachinery

基　　金：国家自然科学基金重点项目(51135001);北京高等学校青年英才计划(YETP0495)

摘　　要：整体齿轮增速式离心压缩机振动特性较单转子压缩机更为复杂,由于存在齿轮啮合作用,齿轮-转子-轴承系统耦合出新的频率、振动峰值。本文以一台在役的4轴6级整体齿轮增速式离心压缩机为研究对象,建立齿轮-转子-轴承系统的弯扭耦合有限元模型,分析在工作转速下不断提升负荷过程中耦合系统的动力学特性。模态分析表明:随着负荷增大,耦合频率中的单轴弯扭耦合频率增幅较大,并在75%负荷时与激振频率相交;不平衡响应分析表明:随着负荷增大,在80%负荷时出现临界负荷点,轴承处出现振动峰值。稳定性分析表明:随着负荷增大,单轴弯曲频率所对应的对数衰减率降低,单轴弯扭耦合频率所对应的对数衰减率部分增大、部分降低,多轴弯扭耦合频率所对应的对数衰减率增大。The vibration characteristics of an integrally geared Centrifugal compressor are more complex than a single-rotor compressor, due to the gear meshing, a gear-rotor-bearing system couples to new frequencies and the vibration peaks. In this paper, a four-axis and six stages integrally geared centrifugal compressor was taken and the bending and as the research object, torsion coupling finite element model of the gear-rotor-bearing system was established. The dynamics characteristic of the system was analysed when the external loads are increasing under the operating speed.Modal analysis shows that with the load increasing, the bending and torsion coupling frequencies of the single-rotor increase a lot, and intersect with the excitation frequencies at 75% load point.Unbalance response analysis shows that with the load increasing, the critical load point emerges when the load is 80% and the bearings occur peak vibrations. Stability analysis shows thatwith the load increasing, the corresponding logarithmic decrement rates of the single-rotor＇s bending frequencies decrease, the corresponding logarithmic decrement rates of the single-rotor＇s bending and torsion coupling frequencies decrease partly and the others increase, the corresponding logarithmic decrement rates of the multi-axial bending and torsion coupling frequencies increase,.

关 键 词：齿轮啮合 耦合频率 不平衡响应 临界负荷 对数衰减率 

分 类 号：TH452[机械工程—机械制造及自动化] TK05[动力工程及工程热物理]