Academic Journal of Engineering and Technology Science, 2023, 6(4); doi: 10.25236/AJETS.2023.060405.
Zhou Yue1, Kang Huimin1, Zhang Xuewen2
1School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan, China
2Harbin Electric Corporation Wind Power Co., Ltd, Xiangtan, China
In view of the problem of heat accumulation of oil film in heavy-duty hydrostatic bearings, the method of equal oil film thickness control is used to reduce the eccentricity of the spindle and reduce the heat accumulation. Based on the piezoelectric equation, the mathematical model of the piezoelectric stacked thin film flow rattle was obtained. Based on the flow formula of the oil cavity of the throttle and the hydrostatic bearing, the bearing capacity formula of the hydrostatic bearing was obtained. The transfer function of the control system is obtained by linearizing the bearing capacity of the hydrostatic bearing by the regress function in MATLAB, and finally the control of the equal oil film thickness under the PID algorithm is realized. It is found that the increase of oil supply pressure, bearing width and oil chamber size of hydrostatic bearings can reduce the amplitude of oil film thickness, but has almost no effect on the response time of active control. Hydrostatic bearings under the control of equal oil film thickness significantly improve the bearing capacity and stiffness while driving the eccentricity of the spindle to zero. This makes hydrostatic bearings better suited for high precision and heavy duty applications.
Hydrostatic bearings; Piezoelectric stacked thin film flow restrictor; Iso-oil film thickness control; PID control
Zhou Yue, Kang Huimin, Zhang Xuewen. Isofilm thickness control of hydrostatic bearings under piezoelectric stacked film restrictors. Academic Journal of Engineering and Technology Science (2023) Vol. 6, Issue 4: 28-35. https://doi.org/10.25236/AJETS.2023.060405.
 Corbett J, McKeown P A, Peggs G N, et al.(2000). Nanotechnology: international developments and emerging products. CIRP Annals, (2), 523-545.
 Xiong Wanli, Hou Zhiquan, Lv Lang.(2014). Study on the formation mechanism of rotation error of hydrostatic spindle. Journal of Mechanical Engineering, (07),112-119.
 Hu Can, Xiong Wanli, Sun Wenbiao, Yuan Shuai.(2019). Study on the mechanism of improving the rotation accuracy of controlled throttling hydrostatic spindle. Journal of Mechanical Engineering, (11), 160-168.
 Woody S, Smith S.(2006). Design and performance of a dual drive system for tip-tilt angular control of a 300 mm diameter mirror. Mechatronics, (7), 389-397.
 Kenton B J, Fleming A J, Leang K K.(2011), Compact ultra-fast vertical nanopositioner for improving scanning probe microscope scan speed. Review of Scientific Instruments, (12).
 Yang X G, Wang Y Q, Jiang G Y, et al.(2015). Dynamic characteristics of hydrostatic active journal bearing of four oil recesses. Tribology Transactions, (1), 7-17.
 Huang Jixiong, Liu Yu, Li Peng.(2017). Simulation analysis of film restrictor for active control of hydrostatic bearing. Combined Machine Tool and Automatic Processing Technology, (02), 65-67+72.
 Liu Lei, Liu Baoguo, Wang Pan, Shen Huipeng, Ding Hao, Zheng Jinyong.(2019). Pressure field and temperature field analysis of hydrostatic bearing oil film. Mechanical and Electrical Engineering, (09), 900-906.
 Liu Yu.(2017). Design and performance analysis of actively controlled hydrostatic bearing film flow restrictor, Master’s thesis, Wuhan University of Technology, Wuhan, Hubei Province.