冲击激励下轴线失准转子-磁轴承系统不对中定量研究  

Quantitative Research on Misalignment Magnitude of Rotor-Magnetic Bearing System with Axis Misalignment Under Shock Excitation

作　　者：肖玲[1] 李园超 赵晨曦 程文杰[1] 冯圣 XIAO Ling;LI Yuanchao;ZHAO Chenxi;CHENG Wenjie;FENG Sheng(College of Science,Xi’an University of Science and Technology,Xi’an 710054,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]西安交通大学机械工程学院,陕西西安710049

出　　处：《西南交通大学学报》2024年第4期737-745,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(52275271);陕西省自然科学基金(2022JM-194)。

摘　　要：为研究和识别转子系统在轴承处发生的平行角度混合不对中,提出一种频谱辨识转子-磁轴承系统固有不对中量大小的方法.采用动量矩定理将圆盘不平衡力对转轴的影响等效到转子轴向力上,建立考虑轴向径向耦合效应的刚性双偏置圆盘转子-磁轴承系统的动力学模型;通过SIMULINK仿真得到系统时域下的位移和电流响应,分析不对中条件下转子系统动力学特性,并利用快速傅里叶变换将时域响应转换为频域响应,基于频域下最小二乘算法得到转子系统不对中量大小.结果表明:在冲击激励影响条件下,采用该方法计算的不对中量大小误差均在5.0%以内,当转子受到外界扰动力时,该算法能够准确定量识别转子的不对中量,可为不对中转子-磁轴承系统故障诊断及自修复提供理论参考.A spectral identification method for calculating the magnitude of inherent misalignment in a rotormagnetic bearing system was proposed to study and identify mixed parallel misalignment of the rotor system occurring at the bearing.The momentum moment theorem was used to equate the effect of the disc unbalance force on the rotating shaft to the axial force of the rotor and establish a dynamics model of the rigid double offset disc rotor-magnetic bearing system considering the axial and radial coupling effects.The SIMULINK simulation was used to calculate the displacement and current response of the system in the time domain,and the dynamics characteristics of the rotor system under the misalignment condition were analyzed.Furthermore,the fast Fourier transform was utilized to convert the response in the time domain into that in the frequency domain.The magnitude of the misalignment of the rotor system was then calculated based on the least squares algorithm in the frequency domain.The results show that the error in the calculated magnitude of misalignment by using this method is within 5.0%under the influence of shock excitation,indicating that even if the rotor is affected by external disturbance forces,the algorithm can accurately quantify the rotor’s misalignment.This provides a theoretical reference for fault diagnosis and self-repair of misaligned rotor-magnetic bearing systems.

关 键 词：冲击载荷 轴承-转子系统 不对中量 快速傅里叶变换 轴向径向耦合 

分 类 号：TH133.3[机械工程—机械制造及自动化]