Advanced Control of Hydraulic System for Hydrostatic Bearings

液靜壓軸承進階控制

莊鎧榤(Kai-Chieh Chuang) ； 王紹陽(Shao-Yang Wang) ； 江宇倫(Yu-Lun Chiang) ； 杜佳穎(Jia-Ying Tu)

《中國機械工程學刊》 42卷3期 (2021/06) Pp. 275-284

摘要

Recent developments in precision manufacturing heighten the need of hydrostatic bearings for machine tools, because of the advantages of high stiffness, high precision, low friction and long service life, as compared with the traditional roller bearing systems. In literature, attention has been paid to the design of fixed-type restrictors such as capillaries for hydrostatic bearings. However, such passive flow restrictors could not effectively compensate for oil pressure variation as a result of loading changes. To seek an alternative for improving the operation precision of hydrostatic bearings, pressure control using active proportional valve is considered in this work. Four proportional valves are installed in the hydraulic system and controlled by advanced output feedback control with integral action and model matching techniques. Experimental studies on the actively-controlled hydrostatic system are performed. The results show that the rising time and tracking accuracy of the oil pressure are effectively improved by the proposed active control framework, thus sustaining the performance of hydraulic bearing. The success of this research offers a feasible control framework for the development of intelligent control and manufacture of machine tools in future work.

關鍵字

Hydrostatic bearing ； restrictor ； hydraulic system ； model matching control ； OFCIA

並列摘要

近年來液靜壓軸承相較於傳統的滾珠軸承，具有高剛性、高精度、低摩擦和壽命長的優勢，工具機產業著重在液靜壓軸承的發展。在文獻中，液靜壓毛細管節流器的設計被廣泛的探討，然而被動式的裝置無法有效地補償負載造成的油壓變化，本文提出另一種替代的方法，使用主動式比例壓力閥進行壓力控制來提高液靜壓軸承運行的精度。在液靜壓軸承系統中安裝四個比例閥，利用進階輸出反饋控制法和模型匹配法進行控制，並對液靜壓系統進行實驗研究，實驗結果顯示所提出的主動控制架構有效地改善油壓的上升時間和追蹤精度。本文研究結果對未來的智能控制的發展和工具的製造提供一種可行的控制架構。