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

The present work deals with finite element method analysis of a multirecess hybrid spherical journal bearing system. The governing equations have been discretized using Galerkin’s technique and are solved simultaneously using a suitable iterative technique. The effect of span angle on the static and dynamic behavior of a hybrid spherical journal bearing compensated with membrane restrictor is investigated in the present work. Numerical results indicate that larger values of span angle provide enhanced value of minimum fluid-film thickness [Formula: see text], reduced lubricant flow requirement [Formula: see text], and higher value of frictional torque [Formula: see text]. Further, the results have been compared with a correspondingly similar capillary-compensated bearing. The comparison of numerically results demonstrates that the value of direct fluid-film stiffness coefficient [Formula: see text] could be 45.90% higher than that of correspondingly similar capillary-compensated bearing. The numerical results presented in this work may be useful as design guidelines for a recessed hybrid spherical journal bearing.

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“…Kang et al. 22 and Gohara et al. 23 studied the hydrostatic circular thrust bearing using membrane restrictor as compensating device.…”

Section: Introductionmentioning

confidence: 99%

“…Kang et al. 22 presented a modified technique for obtaining the lubricant flow rate using regression method. Gohara et al.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of multirecess hybrid spherical journal bearing system

Tomar

Sharma

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Kang et al 3 proposed that the results of engineering algorithms were with the experimental data in error. Therefore, the film deformation and oil film thickness were calculated to correct the unidirectional film restrictor.…”

Section: Introductionmentioning

confidence: 99%

Study of membrane restrictors in hydrostatic bearing

Chen

Pan

et al. 2018

Advances in Mechanical Engineering

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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.

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“…Kang et al. 5 obtained the actual flow rates of single-action type membrane restrictor through experimental measurements, and found that a large discrepancy (167–643%) exists compared to the results of traditional method. Hence, he put forward several mathematical models obtained by regression of experimental results to simulate the relationship between flow rate and supply pressures of lubricants.…”

Section: Introductionmentioning

confidence: 99%

An accurate method for determination of the performance characteristics of membrane-type restrictors

Pan

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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The determination of flow rate and fluid resistance for membrane-type restrictors is modified in this paper, and it can be more accurate and confident from the measurements in experiments. Three coupled equations including Reynolds equation, membrane deformation equation of large axisymmetric deflection and flow rate equation have been used to establish the mathematical model of membrane-type restrictor and solved simultaneously. Several cases are simulated by the traditional method and the modified numerical method, and the simulation results are compared with experimental data for flow rates and fluid resistances. It has been found that the determination of the performance characteristics of membrane-type restrictors is significantly affected by the hypotheses of membrane deflection scales, the pressures distribution and the gap height between the sill and membrane. The numerical results of the modified method are much more approximated to the actual flow rate measured in Kang et al.’s work than those of the traditional formula, and the proposed method can increase the determination accuracy of the flow rate and restriction coefficient in the design of membrane-type restrictors distinctly.

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

Cited by 35 publications

References 8 publications

Finite element analysis of multirecess hybrid spherical journal bearing system

Finite element analysis of multirecess hybrid spherical journal bearing system

Study of membrane restrictors in hydrostatic bearing

An accurate method for determination of the performance characteristics of membrane-type restrictors

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