面向自适应控制的油膜厚度动力学建模与分析  

Dynamics Modeling and Analysis of Film Thickness for Adaptive Control

作　　者：罗永顺[1] 王晓军[1] 覃孟杨 曾祥坤[1] 罗忠辉[1] 

机构地区：[1]广东技术师范学院广东普通高校数控技术重点实验室,广东广州510635

出　　处：《机床与液压》2016年第1期29-31,58,共4页Machine Tool & Hydraulics

基　　金：国家自然科学基金资助项目(50875089);国家技术创新基金资助项目(13C26213603116);广东省科技创新项目(2013KJCX0119)

摘　　要：实现数控机床自适应控制的前提条件是有相关的动力学模型。建立带有载荷、温度等非线性因素的油膜厚度动力学模型是实现重型精密数控机床垂直位移自适应控制的关键。针对没有适用于静压导轨油膜厚度的自适应控制模型,基于Navier-Stokes方程,提出了静压导轨油膜厚度的非线性动力学模型及其简化模型,两者都可用于自适应控制。该模型能体现导轨承受负载变化与油膜厚度变化关系,并包含油膜厚度变化的速度和加速度项,适用于精密液体静压数控设备。经过Simulink tools工具仿真模拟,精度达到10^(-4)的数量级,验证了非线性模型和近似模型的准确性。The prerequisite of realization of adaptive control of computer numercial control( CNC) machine tools are having relevant dynamics model. The key of implementation of adaptive control of vertical displacement of heavy precision CNC machine tools is the establishment of film thickness dynamics model with nonlinear factors of load,temperature,and etc. Aimed at no adaptive control model suitable for hydrostatic guideway film thickness,based on the Navier-Stokes equations,nonlinear dynamics model and simplified model of hydrostatic guideway film thickness were proposed,and both of them could be used for adaptive control. The model had the characteristics to reflect the relationship between guideway load change and film thickness variations,and included the speed and acceleration term of film thickness change,which is suitable for precision hydrostatic CNC equipment. After the simulation by using Simulink tools,model calculation accuracy magnitude reaches 10^(-4),which results verify the accuracy of nonlinear model and approximate model.

关 键 词：液体静压导轨 油膜厚度 非线性动力学模型 自适应控制 

分 类 号：TH137[机械工程—机械制造及自动化]