摘要
将PM流量控制器用于无周向回油槽四腔向心静压轴承,建立了PM流量控制器静压轴承数学模型,重点研究分析了轴承结构参数及PM流量控制器参数对静压轴承特性的影响。研究结果表明:轴承轴流封油边系数越小、周流封油边系数越大,轴承油膜刚度和承载力越大,初始油膜间隙增大,油膜刚度减小;润滑油动力粘度较大且初始油膜间隙较小时,油膜刚度和承载力较大;液阻比越小,比流量越大,油膜刚度越大;供油压力越大,油膜刚度、承载力和流量越大。同时基于线性化下液体静压轴承系统的传递函数,利用Matlab Simulink软件在时域和频域内分别研究了静压轴承系统的动态特性。研究结果表明:在阶跃载荷作用下,随着供油压力和比流量的提高,过渡过程时间越短,静压轴承系统的动态特性越好;在正弦载荷作用下,提高供油压力、比流量都会使轴心偏移量的稳态幅值减小,油膜动刚度增大,且供油压力较比流量对系统频率特性的影响显著。
For the first time without circumferential oil groove back four cavity radial hydrostatic bearing for Progressive Mengen （PM） flow controller, the mathematical model for hydrostatic bearings is established and the effect of the bearing structure parameters on the static characteristics of aerostatic bearing is analyzed. The results show that the smaller the axial flow oil seal edge coefficient is, the bigger the circurnfluence oil seal edge coefficient, the larger the bearing oil film stiffness and bearing capacity; the oil film stiffness decreases with the increasing of initial oil film clearance ; the smaler the dynamic viscosity of lubricating oil large and initial oil film clearance is, the larger the oil film stiffness and bearing capacity; the smaller the liquid resistance ratio is, the larger the flow ratio and the oil film stiffness; the larger the oil pressure is, the larger the oil film stiffness, bearing force and flow. Based on the transfer function of hydrostatic bearing system, the dynamic characteristics of hydrostatic bearing system are studied in the time domain and frequency domain by using the Simulink Matlab. The results indicate that under the step load, with the increasing of oil pressure and flow ratio and shortening of transition time, the dynamic characteristics of hydrostatic bearing system become better; under sinusoidal load, with the increasing of supply pressure, the flow ratio will derease the steady-state amplitude of axial offset, the oil film dynamic stiffness increases, and the effect of the oil pressure on the frequency characteristics is more significant than the flow ratio.
出处
《机械科学与技术》
CSCD
北大核心
2016年第7期1073-1082,共10页
Mechanical Science and Technology for Aerospace Engineering
基金
国家科技重大专项项目(2012ZX04002-091)资助
关键词
液体静压轴承
PM流量控制器
静态特性
动态特性
hydrostatic bearing
PM flow controller
static characteristics
dynamic characteristics
