精密数控机床液体静压导轨油膜波动补偿控制研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (22) : 28-34.

论文

胡均平1，胡骞1，李科军1，刘成沛1，徐大清2

作者信息 +

Research on compensation control of oil thickness fluctuation in precision NC machine hydrostatic guide system

HU Junping1，HU Qian1，LI Kejun1，LIU Chengpei1，XU Daqing2

Author information +

文章历史 +

摘要

针对加工载荷作用下液体静压导轨油膜厚度波动的问题，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的特性，提出对静压导轨油腔压力的主动预见控制策略。采用MATLAB搭建了油膜波动补偿控制系统的仿真模型，分析比较了不加控制、采用最优控制和引入主动预见控制时导轨油膜厚度波动情况，并观测采用后两种控制方式时的油腔压力改变量。仿真结果表明：预见控制作用下油膜厚度波动量比采用最优控制方式时减小73.3%，比不加控制时减小94.1%；而且，油腔压力对加工载荷的跟随性提升23%。最后，以溜板动态偏移量为指标进行实测分析，验证了主动预见控制策略对油膜波动补偿的有效性。

Abstract

Due to the oil film thickness fluctuation in hydrostatic guide under dynamic processing load, 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, the simulation of compensation control system model was obtained. The fluctuation of oil film thickness were compared under the condition of no control, using the optimal control and the active preview control. The variation of the oil cavity pressure was observed when using the two latter control methods. The simulation results show that the oil film fluctuation by using active preview control method reduces 73.3% compared to the optimal control method, and reduces 94.1% compared to without any control method. 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 the simulation computation.

导出引用

胡均平1，胡骞1，李科军1，刘成沛1，徐大清2. 精密数控机床液体静压导轨油膜波动补偿控制研究[J]. 振动与冲击, 2015, 34(22): 28-34

HU Junping1，HU Qian1，LI Kejun1，LIU Chengpei1，XU Daqing2. Research on compensation control of oil thickness fluctuation in precision NC machine hydrostatic guide system[J]. Journal of Vibration and Shock, 2015, 34(22): 28-34

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