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CSME 2021/06
Volume 42 No.3
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275-284
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Advanced Control of Hydraulic System for Hydrostatic Bearings
Kai-Chieh Chuanga, Shao-Yang Wanga, Yu-Lun Chianga and Jia-Ying Tub
aGradnate Student, Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300044, ROC.
bAssociate Professor, Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300044, ROC.
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Abstract:
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.
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Keywords: Hydrostatic bearing, restrictor, hydraulic system, model matching control, OFCIA
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©
2021
CSME , ISSN 0257-9731
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