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Academic Journal of Engineering and Technology Science, 2023, 6(4); doi: 10.25236/AJETS.2023.060405.

Isofilm thickness control of hydrostatic bearings under piezoelectric stacked film restrictors


Zhou Yue1, Kang Huimin1, Zhang Xuewen2

Corresponding Author:
Kang Huimin

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

Cite This Paper

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.


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