磁液双悬浮轴承单自由度支承系统一阶参数灵敏度分析  

First-Order Parameters Sensitivity Analysis of Single-DOF Supporting System of Megnetic-Liquid Double Suspension Bearing

作　　者：李伟楠 杨永 王进 赵建华 LI Weinan;YANG Yong;WANG Jin;ZHAO Jianhua(Shijiazhuang Haishan Industrial Development Co.,Ltd.,Shijiazhuang Hebei 050200,China;Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control,Yanshan University,Qinhuangdao Hebei 066004,China)

机构地区：[1]石家庄海山实业发展总公司,河北石家庄050200 [2]燕山大学,河北省重型机械流体动力传输与控制实验室,河北秦皇岛066004

出　　处：《机床与液压》2022年第6期168-173,共6页Machine Tool & Hydraulics

基　　金：国家自然科学基金项目(51705445;52075468);河北省自然科学基金项目(E2020203052);河北省高等学校科学研究项目青年基金项目(QN2020130);江苏省船海机械先进制造及工艺重点实验室开放基金项目;河北省光伏组件制造装备技术创新中心开放课题。

摘　　要：磁液双悬浮轴承是将液体静压和电磁悬浮两种支承相结合而形成的一种新的轴承,能够大幅提升承载能力及刚度。由于耦合了液体静压和电磁悬浮两个非线性支承系统,磁液双悬浮轴承系统在运行过程中受到多参数的影响,使得其运行规律不明确。对系统中参数进行灵敏度分析,寻找主要影响参数。推导轴承系统的状态空间描述和其一阶灵敏度方程,通过MATLAB仿真求解6个特征参数(油液黏度系数、轴承质量、液膜厚度、封油边宽度、流量和电流)对轴承系统振动的影响。结果表明:当各参数变化相同的数值时,轴承转子位移对轴承系统中流量、电流以及液膜厚度的灵敏度函数λ_(1)^(5)、λ_(1)^(6)、λ_(1)^(3)远远高于其他灵敏度函数所表现出的对系统的影响强度;静压力主要参数流量a_(5)和液膜厚度参数a_(3)及电磁力主要参数电流a_(6)的2种灵敏度指标明显大于其他参数;流量a_(5)、电流a_(6)分别为系统的第一、第二影响参数。研究结果为磁液双悬浮轴承的参数设计及稳定运行提供参考。Megnetic-liquid double suspension bearing(MLDSB)is a new kind of bearing formed by combining hydrostatic pres⁃sure and electromagnetic suspension,which can greatly improve the bearing capacity and stiffness.Due to the coupling of hydrostatic and electromagnetic suspension systems,MLDSB is affected by multiple parameters in the operation process,which makes its opera⁃tion rule unclear.The sensitivity analysis on the parameters in the system was carried out to find the main influencing parameters.The state space description and the first-order sensitivity equation of the bearing system were derived;and the influences of six characteris⁃tic parameters such as oil viscosity coefficient,bearing mass,liquid film thickness,oil sealing edge width,supply flow and supply current,on the vibration of the bearing system were solved through MATLAB simulation.The results show that when each parameter changes the same value,the sensitivity function of bearing rotor displacement to the flow rateλ_(1)^(5),currentλ_(1)^(6)and liquid film thicknessλ_(1)^(3)in the bearing system are much higher than the influence intensity of other sensitivity functions on the system;the two sensitivity in⁃dexes of flow a_(5),liquid film thickness a_(3) and current a_(6) are obviously higher than other parameters;the flow a_(5) and current a_(6) are the first and second influencing parameters of the system respectively.The research results provide reference for parameter design and sta⁃ble operation of MLDSB.

关 键 词：磁液双悬浮轴承 单自由度系统 非线性系统 灵敏度分析 

分 类 号：TH132[机械工程—机械制造及自动化]