Inviewoftheoilfilmthicknessfluctuationinhydrostaticguideunderdynamicloadinmechanical processing,a state-space model of closed hydrostatic guide system was established. Considering the foreseeable characteristics of processing load in precision NC machine tool,an active preview control strategy for the oil cavity pressure was presented.By means of MATLAB software,a simulation model for the compensation control system was built.The fluctuation of oil film thickness was investigated under the conditions of no control,optimal control and active preview control.The variation of the oil cavity pressure under the optimal and active control was observed.The simulation results show that the oil film fluctuation under active preview control reduces by 73 .3% compared to the case of optimal control,and reduces by 94.1% compared to the case of no control.Besides,the following performance of the cavity oil pressure on the processing load is improved by 23%.Finally,an experiment evaluating the deviation of the slider was carried out.The experiment results correspond to those of the simulation computation.%针对加工载荷作用的液体静压导轨油膜厚度波动问题，建立闭式液体静压导轨系统状态空间模型，利用精密数控机床加工载荷可预知特性，提出对静压导轨油腔压力主动预见控制策略。采用MATLAB搭建油膜波动补偿控制系统仿真模型，分析比较不加控制、采用最优控制、引入主动预见控制时导轨油膜厚度波动情况，观测两种控制方式时的油腔压力改变量。结果表明，预见控制作用下油膜厚度波动量较采用最优控制方式时减小73．3％，较不加控制减小94．1％；油腔压力对加工载荷跟随性提升23％。通过以溜板动态偏移量为指标的实测分析，验证主动预见控制策略对油膜波动补偿的有效性。
展开▼
