Thermohydrostatic analysis of slot-entry hybrid journal bearing

Sharma, Satish C.; Kumar, Vijay; Jain, S. C.; Nagaraju, T. Vamsi; Prasad, Giriraj

doi:10.1016/s0301-679x(02)00008-7

Cited by 29 publications

(15 citation statements)

References 22 publications

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“…The thermal boundary conditions used for the solution of equations (8) and (9) The global system equations of governing equations (1), (8) and (9) is obtained by employing Galerkin's orthogonality criterion and then solved after applying appropriate boundary conditions. 9 The entire lubricant fl ow fi eld is discretised using eight-noded hexahedral linear isoparametric elements.…”

Section: Thermal Boundary Conditionsmentioning

confidence: 99%

“…It has been concluded that in general, a constant fl ow valve compensated hole-entry hybrid journal bearing gives superior performance from the point of view of minimum fl uid fi lm thickness and threshold speed. Sharma et al 8 developed a theoretical model to take into account the infl uence of thermal effects in slot-entry hybrid journal bearing by considering the variation of viscosity due to temperature rise of the lubricant. It has been found out that the consideration of thermal effects lowers the value of minimum fl uid fi lm thickness for both symmetric as well as asymmetric confi gurations, while the lubricant supply requirement of a slot-entry hybrid journal bearing system is found to increase.…”

Section: Introductionmentioning

confidence: 99%

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Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

Garg

Kumar

Sharda³

2007

Lubrication Science

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Every high speed machine, demanding high level of perfection, can operate successfully through a precise design of bearings. Such a design can be formulated after carefully studying both static and dynamic characteristics of the journal bearing. The present paper described the study of static and dynamic performance of a hole-entry hybrid journal bearing system compensated with constant fl ow valve restrictor by considering the combined infl uence of thermal effects and non-Newtonian behaviour of the lubricant. The variation of the viscosity due to the non-Newtonian behaviour of the lubricant and temperature rise has been considered in the study. The numerical solution of the generalized Reynolds equation governing the fl ow of the lubricant, having variable viscosity along with the energy and heat conduction equations, was obtained using fi nite element method. The nonNewtonian lubricant has been assumed to follow the cubic shear stress law. The study included the performance of a double row symmetric hole-entry hybrid journal bearing confi guration containing 12 holes per row. The results presented in this paper indicate that change in viscosity of lubricant affects the performance of the holeentry hybrid journal bearing system quite signifi cantly.

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Section: Thermal Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

Garg

Kumar

Sharda³

2007

Lubrication Science

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“…A theoretical model of slot entry hybrid bearing was developed by Sharma et al [8], in which viscosity variation due to thermal effects was considered. It was reported that minimum fluid film thickness reduces for all the configurations of bearing due to thermal effects.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations of the Rotor Vibration Amplitude of the Turbocharger and Bearings Temperature

Zadorozhnaya¹,

Sibiryakov²,

Hudyakov³

2017

Tribol. Ind.

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“…Yang et al [3] studied the thermal effects in liquid oxygen hydrostatic journal bearings experimentally. Sharma et al [4][5] measured and summarized the influence of oil temperature rise on the symmetric and asymmetric slot-entry hybrid journal bearing, as well as the influence of oil temperature rise and bush deformation on static and dynamic performances of hole-entry hybrid journal bearing. Park et al [6] investigated the relationship between oil temperature and positioning error of hydrostatic guideways by experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Thermal simulation modeling of a hydrostatic machine feed platform

Gao

Tian

et al. 2015

Int J Adv Manuf Technol

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. (2014) The bounds on tracking performance utilising a laser-based linear and angular sensing and measurement methodology for micro/nano manipulation. Measurement Science and Technology, 25 (12). 125005. Permanent WRAP url:http://wrap.warwick.ac.uk/76390 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:"The final publication is available at Springer via http://dx.doi.org/10.1007/s00170-015-6881-0 ." A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Abstract: Hydrostatic guideways are widely applied into precision and ultra-precision machine tools.Meanwhile, the oil film heat transfer causes thermal disturbance to the machine accuracy. Therefore, it is necessary to study the mechanism of the oil film heat transfer and the heat transfer reducing method to improve the machine accuracy. This paper describes a comprehensive thermal FE simulation modeling method for the hydrostatic machine feed platform to study methods of reducing machine thermal errors. First of all, the generating heat power of viscous hydraulic oil flowing between parallel planes is calculated based on Bernoulli equation. This calculation is then employed for the simulation load calculations for the closed hydrostatic guideways, which is adopted by the hydrostatic machine feed platform. Especially, in these load calculations, the changing of oil film thickness (resulted from external loads) and the changing of oil dynamic viscosity (influenced by its temperature) are taken into account. Based on these loads, thermal FE simulation modeling of the hydrostatic machine feed platform is completed to predict and analyze its thermal characteristics. The reliability of this simulation modeling method is verified by experiments. The studies demonstrate that: the hydrostatic machine thermal error degree is determined by the oil film heat transfer scale, and this scale is mainly influenced by the relative oil supply temperature to ambient temperature (quantitative comparison of oil supply temperature and ambient temperature). Furthermore, the r...

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Thermohydrostatic analysis of slot-entry hybrid journal bearing

Cited by 29 publications

References 22 publications

Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

Non‐Newtonian and thermal effects in constant flow valve compensated symmetric hole‐entry hybrid journal bearing

Theoretical and Experimental Investigations of the Rotor Vibration Amplitude of the Turbocharger and Bearings Temperature

Thermal simulation modeling of a hydrostatic machine feed platform

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