An extended Reynold equation applicable to high reduced Reynolds number operation of journal bearings

A hydrodynamic lubrication analysis for connecting rod big-end bearing is conducted. The effects of engine speed, operating condition, lubricant viscosity and oil temperature on tribological performance of big-end bearing have been examined. Force equilibrium is solved to define instantaneous eccentricity between journal and bearing to have accurate estimation of oil film thickness at interface of connecting rod big-end bearing and crankpin. Connecting rod big-end is treated as π film hydrodynamic journal bearing and finite difference scheme is applied to calculate generated hydrodynamic pressure and frictional power loss at each crank angle. Beside the development of analytical formulation, well-known Mobility model introduced by Booker has been employed to be compared with the analytical model. The presented analytical model reduces the complexity and the numerical effort with respect to Mobility method, thus shortening the computation time. The simulation results show good agreement between analytical model, Mobility approach and experimental data.

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“…Substituting Equation (17) in Equation (18) and performing the derivatives, the expression of hydrodynamic pressure can be obtained:…”

Section: Numerical Solutionmentioning

confidence: 99%

“…Constantinescu's theory was employed to develop a full extended Reynolds equation to evaluate tribological performance of finite length bearings considering laminar and turbulent regimes [18]. The effects of both convective and temporal inertia have been examined without consideration of the normal thin film assumption.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Power Loss and Lubrication of Connecting Rod Big-End

2019

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“…(21) are referred to pad number "i": Figure 6, the pad load is considered to be in direction pointing to bearing center. The projection of bearing load to r-φ co-ordinate system is then (18) In Eqs. (22), (23), the function K (η) is one of the function K L (η) , K E (η) or K P (η) depending on which one is chosen.…”

Section: Assembly Proceduresmentioning

confidence: 99%

“…The effect of turbulence on stiffness and damping was investigated in Refs. [18,19]. In review on available information, methods to determine stiffness and damping are mainly relying on numerical simulation for bearings with multiple axial grooves.…”

Section: Introductionmentioning

confidence: 99%

A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

Ren¹

2020

Chin. J. Mech. Eng.

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Water lubricated guide bearings for hydro turbines and pumps are conventionally designed with multiple axial grooves to provide effectively cooling and flushing away abrasives. Due to the variety of groove configuration in terms of number and size, a predication of their performance is difficult. This paper deals with an analytical procedure to investigate groove effect on load capacity, stiffness and damping for this type of bearing where it is considered as an assembly of many inclined slide bearings. The result can be applied to bearings made of hard materials combined with low bearing pressure.

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“…A comprehensive debate on the properties of inertial effects of fluid on lubricant bearing steadiness observing that inertial special contribution are noteworthy in calculation of the rotor steadiness quantities is done by Kakoty and Majumadar [34]. As presented in recent researches [35][36][37][38][39][40][41][42] the inspiration of the ultrafine extracts on hydrodynamic oils lubrication and vibration and friction of the fluid flow film bearings greased with the with ultrafine spices.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

Jamalabadi

2017

IJET

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Abstract. The aim of this paper is numerical analysis of plain journal bearing with Nano particle added lubricating oil. The fluid film bearing is studied with the modified Reynolds equation which considered time dependent inertia effects at rotating speeds with the linearized turbulence. The research is performed for numerous nano-fluids include nanoparticles of CuO, TiO 2 , Ag and Cu and SAE 20W50 as a base fluid. The time transient governing equations include the incompressible mass conservation equation, Navier-Stokes momentum equations for thin film lubrication, and full kinematic including shaft accelerations are solved numerically. Two cases of long and short bearings are studied with Sommerfeld and Gumbel boundary conditions. Linearized force coefficients such as mass, stiffness and damping factors are obtained for an ordinary journal bearing. The ordinary plain journal bearing velocity response and the rotor displacements when sudden forces applied by rigid rotor symmetrically is achieved. The results prove that using the nanoparticle enhanced lubricant causes higher mass coefficients, damping ratios and fluid effective stiffness.

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An extended Reynold equation applicable to high reduced Reynolds number operation of journal bearings

Cited by 38 publications

References 46 publications

Numerical Study of Power Loss and Lubrication of Connecting Rod Big-End

Numerical Study of Power Loss and Lubrication of Connecting Rod Big-End

A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves

Effects of Nanoparticle Enhanced Lubricant Films in Dynamic Properties of Plain Journal Bearings at High Reynolds Numbers

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