基于主动电磁控制的滑动轴承-转子系统自激振动抑制数值仿真  

Numerical simulation of self-excited vibration suppression of oil-film bearing-rotor system based on active electromagnetic control

作　　者：李晓博[1] 舒进[1] 牛瑞杰 姚兵印[1] 兰昊 陈胤嗣 李萌 于博文 LI Xiaobo;SHU Jin;NIU Ruijie;YAO Bingyin;LAN Hao;CHEN Yinsi;LI Meng;YU Bowen(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Yitong Thermal Technology Service Co.,Ltd.,Xi’an 710032,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安交通大学机械工程学院,陕西西安710049 [3]西安益通热工技术服务有限责任公司,陕西西安710032

出　　处：《热力发电》2020年第9期80-86,共7页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ18-H34)。

摘　　要：本文以滑动轴承支承的柔性转子系统为研究对象,仿真模拟实际机组高速旋转时滑动轴承-转子系统的自激振动情况。首先,基于有限元法建立单圆盘转子动力学模型,轴承非线性油膜力模型采用短轴承油膜力模型,主动电磁控制采用闭环控制策略,通过PID控制器参数得到其等效的刚度和阻尼;然后,采用四阶龙格-库塔法求解转子系统动力学模型,通过对转子施加主动电磁控制抑制其发生自激振动,对比分析转子升速过程中未采用主动电磁控制和采用主动电磁控制时轴承处的振动变化情况。仿真结果表明:未采用主动电磁控制时,自激振动发生在约2倍的一阶临界转速附近,而采用主动电磁控制不但降低了过临界时的振动幅值,还有效抑制了自激振动的发生。By taking the flexible rotor system supported by sliding bearing as the research object,the self-excited vibration of the sliding bearing-rotor system when the real unit rotates at high speed is numerically simulated.The single-disk rotor model is established through finite element method,and the nonlinear oil film force is calculated by short bearing oil film force model.The active electromagnetic control is based on closed-loop control strategy,the equivalent stiffness and damping are obtained by PID controller parameters.The fourth-order Runge-Kutta method is used to solve the rotor system dynamics model.The active electromagnetic control is applied to the rotor to suppress the self-excited vibration.The vibration situation at the bearing when using active electromagnetic control and not using active electromagnetic control during the rotor speeding up process is compared.The simulation results show that,without active electromagnetic control,the self-excited vibration occurs when the speed reaches approximately twice of the first-order critical speed.The implement of active electromagnetic control not only reduces the vibration amplitude at natural frequency,but also can effectively suppress the self-excited vibration.

关 键 词：油膜轴承 自激振动 非线性油膜力 振动抑制 主动电磁控制 

分 类 号：TH133.31[机械工程—机械制造及自动化]