Abstract
This paper presents the effect of pad with transverse grooves on the axial vibration for a small thrust bearing under water lubricated. Due to downsizing of electronic devices, the component part such as the thrust bearing in the micro fabrication becomes small size. Therefore, to study the characteristic of vibration for a small thrust bearing under water lubricated is significant for high precision machining. The hydrodynamic lubrication model was used to predict the water film thickness, the water pressure profile, and the bearing stiffness. A finite difference method (FDM) and a Newton-Raphson scheme are employed to achieve numerical results, i.e. the water pressure distributions, the water lubricating film thicknesses and the bearing stiffness under the variation of groove depths. The grooved shape of pads, that examined in this paper, was elliptical shape. The equation of motion under the impulse excitation considering in the axial vibration for a small thrust bearing was solved by using a Runge-Kutta method. The numerical results showed that the use of elliptical transverse grooves is effective to increases the fluid film stiffness and the maximum displacement in the axial vibration is able to be reduced.
Highlights
The thrust bearing is a common machine element that widely used to support axial loads
In order to produce the small parts in the electronic devices, the high-speed milling becomes important method to achieve high efficiency parts
To study the vibration of small thrust bearing under water-lubricated is important for high precision machining
Summary
The thrust bearing is a common machine element that widely used to support axial loads. An efficiency high-speed milling is affected by the vibration of small thrust bearing. To study the vibration of small thrust bearing under water-lubricated is important for high precision machining. The axial oil film stiffness of tilting pad thrust bearing was investigated [2]. The large tilting pad thrust bearing under oil lubricant was considered. It is obvious that the previous works mentioned above have not numerically investigated the effect of elliptical grooved surface on the axial vibration of small thrust bearing. This paper considered the stiffness of water film bearing under the variation of grooved depths. The axial vibration due to the impulse load for a thrust bearing under the variation of groove depths was investigated numerically. NUMERICAL STUDY ON AXIAL VIBRATION OF WATER-LUBRICATED SMALL THRUST BEARING CONSIDERING GROOVED PAD.
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