Study of membrane restrictors in hydrostatic bearing

Abstract

Hydrostatic guides or bearings are very important crucial components in precision mechanical system. First, the article selects the structural parameters of the standard design film restrictor with regard to hydrostatic bearing. Moreover, using COMSOL, the article performs the fluid-structure interaction analysis of the diaphragm to obtain pressure and stress field distribution, and the deformation of diaphragm in membrane restrictors. Then, fluid resistance and other related properties of the membrane restrictors are obtained, and the related parameters including oil pressure, restrictor gap, membrane thickness, and membrane restrictors to perform feedback action of different oils are explored. Finally, the simulation results and experimental measurements are compared to verify their feasibility. In this study, an oil pressure of 10 bar induced deformation of the membrane with consistent trend; however, oil pressures of 30 and 50 bar induced large error with the same trend.

Effect of elastic throttling structure on the load performance of aerostatic radial bearing

“…To compensate for the bearing stiffness, Lentini et al (2020) optimized the orifice of the aerostatic pad and develop a flow feedback model using a diaphragm valve. Chen et al (2018) designed a hydrostatic bearing with the elastic diaphragm and carried out a fluid-solid coupling analysis. This bearing primarily compensates the flow through the pressure feedback effect of the throttle to improve the load capacity.…”

A novel geometry optimization approach for multi-recess hydrostatic bearing pad operating in static and low-speed conditions using CFD simulation

“…The restrictor plays an important role in achieving high stiffness, stability, and control. Many types of such devices have been proposed to improve the bearing performance, such as ori ce [9,10], membrane members [11], or feedback systems [12]. The lubricant supply is necessary for proper function while moving or until the required sliding speed is reached, in the case of hybrid bearings, for the hydrodynamic effect to occur and carry the load.…”

Design and Performance Analysis of Dual Membrane Restrictor for Hydrostatic Bearing

“…Bassani [12], Chang [13] and Pan [14] also worked on the parameter design and performance analysis off membrane-type restrictor. Chen et al [15] performed a fluid-structure interaction analysis of the diaphragm to more acurrately model the behavior of membrane restrictors.…”

“…K * mi > 1. 33 Theoretically, infinite stiffness for the single pad hydrostatic bearing can be achieved by using a membrane restrictor with a K * mi of 4/3 and α mia of 1/4 when loading appeared at the β c of 1/3 [15]. However, it was also found that the stiffness of the system was very low when the loading was small.…”