| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系 === 106 === Hydrostatic bearing has the advantages of low friction, high rigidity and long therefore, it is widely used in the spindle of the tool machine and the guide. One of the main components that affect the rigidity of hydrostatic bearing is the throttle, The servo valve core structure is similar to the variable type throttle, It has the advantages of high response speed and precise control, This study will try to the control performanceby use the servo valve to build servo hydraulic system and compare different utilized controller for hydrostatic pressure thrust bearing system.
Firstly, In this study, based on the mathematical theory and system identification, the system model of hydrostatic thrust bearing is constructed, Then four different controllers are used to simulate the dynamic system, Four controller are PID, Integral Sliding Mode Control (ISMC), Fuzzy Logic Control (FLC) and the Fuzzy Sliding Mode Control (FSMC), In the simulation, the external load is varied between 500~1200kgf and different setting value of different oil film thickness are employed, The simulation results are further verified by experiments. Finally, the results of this study show that in the four different of controller used in this research, the FSMC control performance is the best, the error is only 0.8~1.1μm for various external load, In addition, The rigidity is not affected by the oil film thickness setting value, However, It is also found that the low setting value of the oil film thickness achieves the smaller power consumption of system.
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