滑动轴承-涡轮电机轴系动力学分析  

Dynamics of Turbine Motor Shafting Supported on Oil Bearing

作　　者：唐长亮 TANG Chang-liang(Key Laboratory of Modem Measurement and Control Technology of Ministry of Education,Beijing Information Science&Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学现代测控技术教育部重点实验室

出　　处：《机械设计与制造》2019年第10期6-9,共4页Machinery Design & Manufacture

基　　金：北京市教委科技计划一般项目(KM201911232007);师资补充与支持计划(5029011103);促进高校内涵发展-科研重点研究培育项目(5211910938);国家自然科学基金(11402267)

摘　　要：针对滑动轴承支承的涡轮电机轴系,基于有限单元法建立了考虑非线性油膜力的动力学模型,计算了轴系主振型、临界转速以及幅频响应等线性动力学特性;进一步通过分岔图、瀑布图、庞加莱截面讨论了系统的非线性动力学特性。结果表明轴系存在4阶主振型,两阶临界转速分别对应涡轮和压气机的锥动模态,且不易激发出转轴弯振模态。在非线性油膜力的作用下,轴系存在周期2、周期4以及拟周期等非线性特征,在多周期运动中,1/4~1/2工频区域的低频振幅要大于工频振幅。For a shafting supported by the oil bearing,the dynamic model considering nonlinear oil film force was established based on the finite element method.The linear dynamic characteristics including the mode shapes,critical speeds and amplitude frequency response were obtained.The nonlinear dynamic characteristics were discussed further by using bifurcation diagrams,waterfall diagrams and Poincare diagrams.The results showed the shafting has four orders mode shapes.Two critical speeds were corresponded to the coning modes of the turbine and compressor respectively,and the bending modes of the rotating shaft were not easily excited.The shafting had period 2,period 4 and quasi period motions under the action of nonlinear oil film force.The low frequency vibrations in 1/4 to 1/2 power frequency region were larger than the working frequency vibrations.

关 键 词：动力学 有限元 主振型 临界转速 非线性油膜力 分岔 

分 类 号：TH16[机械工程—机械制造及自动化] O322[理学—一般力学与力学基础]