Influence of wear on the performance of a 2-lobe multirecess hybrid journal bearing system compensated with membrane restrictor

Static characteristics of a water-lubricated hydrostatic thrust bearing using a membrane restrictor

Modified predictions of restriction coefficient and flow resistance for membrane-type restrictors in hydrostatic bearing by using regression

Effect of geometric imperfections of journal on the performance of micropolar lubricated 4-pocket hybrid journal bearing

Stability analysis of a disk-spindle system supported by coupled journal and thrust bearings considering five degrees of freedom

Purpose – This study aims to utilize the equations of flow equilibrium to determine the variations of film thickness or worktable displacement with respect to the recess pressure for both open‐ and closed‐type hydrostatic flat bearings. The static stiffness can be not only presented directly by these variations but also determined by the differentiation of flow equilibrium equations.Design/methodology/approach – The single‐action variable compensations of three types including cylindrical‐spool, conical‐spool and membrane restrictors are taken into consideration in this study. Specifically, this study presents that membrane restrictor and both spool restrictors with or without preload whilst considering initial opening.Findings – Consequently, the usage range of recess pressure and optimal parameters of appropriate compensation type can be obtained from maximum stiffness and also according to smallest gradient in variations of worktable displacement or film thickness.Originality/value – This article studi...

Design for static stiffness of hydrostatic bearings: single‐action variable compensations

Purpose – The paper aims to determine whether the type selection and parameters determination of the compensation are most important for yielding the acceptable or optimized characteristics in design of hydrostatic bearings.Design/methodology/approach – This paper utilizes the equations of flow equilibrium to determine the film thickness or displacement of worktable with respect to the recess pressure.Findings – The stiffness due to compensation of constant‐flow pump increases monotonically as recess pressure increases. Also, the paper considers which is larger than that due to orifice compensation and capillary compensation at the same recess pressure ratio.Originality/value – The findings show that the usage range of recess pressure and compensation parameters can be selected to correspond to the smallest gradient in variations of worktable displacement or film thickness.

Design for static stiffness of hydrostatic plain bearings: constant compensations

Influence of restrictor on stability of the rigid rotor–hybrid bearing system

Purpose – This paper seeks to modify the determinations of flow rate and fluid resistance, which can be realized and confident from the measurements of flow rates in experiments.Design/methodology/approach – According to coupled physics of solid membrane and lubrication fluid, finite element method is used simultaneously to determine membrane deflection and film thickness. Several cases are simulated by traditional method, finite element method and compared with experimental method for the flow rates and fluid resistances to present the modification of determination results.Findings – The FEM results for the fixed eight‐section are approximated to actual flow rate and are consistent with the modified determination of the flow rates, and so the modified determinations of the flow rates are verified. When a computer of P4 with 1.8 GHz CPU and 512 MB RAM is utilized, time needed for traditional method or modified formula is fewer than one second. However, more than 4 h is required for FEM by using the same c...

Hsing‐Han Lee

Papers

Modified predictions of restriction coefficient and flow resistance for membrane-type restrictors in hydrostatic bearing by using regression

Design for static stiffness of hydrostatic bearings: single‐action variable compensations

Design for static stiffness of hydrostatic plain bearings: constant compensations

Influence of restrictor on stability of the rigid rotor–hybrid bearing system

Modified determination of fluid resistance for membrane‐type restrictors