主控型液体静压轴承转子系统的模型辨识  

Model Identification of Hydrostatic Bearing-Rotor System with Active Control

作　　者：王康[1] 陈淑江[1] 徐春望 路长厚[1] WANG Kang;CHEN Shujiang;XU Chunwang;LU Changhou(School of Mechanical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学机械工程学院,济南250061

出　　处：《轴承》2023年第12期46-51,共6页Bearing

基　　金：山东省自然科学基金资助项目(ZR2019MEE064)。

摘　　要：基于雷诺方程和流量守恒方程建立液体静压主轴转子系统模型,以主动单面薄膜节流阀为控制元件,对主轴的径向运动进行控制。采用频域辨识法对系统输入输出进行辨识,发现静压主轴转子系统在低频低电压范围下的系统特性更接近二阶系统,并通过公式计算出系统的传递函数,得到小扰动下的系统模型,设计模型预测控制(MPC)与PID控制器验证辨识模型的有效性,试验与仿真对比表明,该模型能较为精准地反映系统输入输出特性。A model of hydrostatic spindle rotor system is established based on Reynolds equation and flow conservation equation,and the radial motion of the spindle is controlled by using an active single-sided thin film throttle valve as control element.The frequency domain identification method is used to identify the input and output of the system,it is found that the characteristics of the system are closer to that of second-order system in low frequency and low voltage range.The transfer function of the system is calculated using a formula to obtain the system model under small disturbances.The effectiveness of identification model is verified by designing a model predictive control(MPC)and a PID controller.The comparison between experiments and simulations show that the model can reflect the input and output characteristics of the system accurately.

关 键 词：滑动轴承 液体静压轴承 主动控制技术 系统辨识 频域分析 

分 类 号：TH133.31[机械工程—机械制造及自动化]