Thermo‐elasto‐hydrodynamic lubrication model for journal bearing including shear rate‐dependent viscosity

Bukovnik, Sasa; Offner, Günter; Caika, Valdas; Priebsch, Hans-Herwig; Bartz, W. J.

doi:10.1002/ls.45

Cited by 37 publications

(33 citation statements)

References 11 publications

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“…Furthermore, multigrade engine oils with additives as viscosity index improvers show a shear thinning, that is the non-Newtonian behaviour of the oil which viscosity decreases with the increase in the shear rate  . In general, the so-called Vogel/Barus/Cross equation for the dynamic viscosity   , , T p   can be adopted [31,32]:…”

Section: Lubricant Modelmentioning

confidence: 99%

Tribo-design of lubricants for power loss reduction in the oil-film bearings of a process industry machine: Modelling and experimental tests

Chatterton

Pennacchi

Vania

et al. 2019

Tribology International

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This paper addresses the optimization of the tribological characteristics of lubricating oils used in the process industry. In many cases, the machines are organized in several "stands" to form "lines" and are equipped by spindles supported by oil-film journal bearings that are fed by the same oil. The modelling of a steel roll forming line is presented by using a thermo-elasto-hydro-dynamic model for the calculation of the power dissipated in each journal bearing. The optimal lubricating oil characteristics are defined by means of a multivariate optimization on the parameters of viscosity, temperature and thickness of the oil-film. The results of the experimental tests are shown for the oil used in the real plant and the new oil formulated by simulations.

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Section: Lubricant Modelmentioning

confidence: 99%

Tribo-design of lubricants for power loss reduction in the oil-film bearings of a process industry machine: Modelling and experimental tests

Chatterton

Pennacchi

Vania

et al. 2019

Tribology International

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“…To obtain a pressure dependent oil-model for the simulation, the pressure dependency was impressed onto the measured viscosities by applying the well known Barus-equation [5] with the coefficients from [5]. The so resulting dynamic viscosities correspond qualitatively to experimental data [4].…”

Section: Simulationmentioning

confidence: 99%

Friction in Automotive Engines

Allmaier¹,

Priestner²,

Sander³

et al. 2013

Tribology in Engineering

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“…The amount of oil filling depends on the oil supply type and pressure and the contacting components on the engine running conditions and on the viscosity of the lubricant itself. It is commonly known that temperature, pressure, and shear rate of the lubricating oil influences its viscosity, details of which can be found in Bukovnic et al 1 and Gohar and Rahnejat. 2 For the simulation of the hydrodynamic journal bearing, the modeling of the dynamics of the structural components and the modeling of the fluid dynamics in the lubrication domain is required.…”

Section: Introductionmentioning

confidence: 99%

“…Arnold and Schiehlen 22 ). In this model, the mechanical and hydrodynamic equations are coupled on an iterative basis in accordance with Bukovnic et al 1 and Offner et al 23 A Newton-Raphson approach is utilized for this purpose, and the approach is generic so that both center and surface couplings are possible.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of hydrodynamic lubricated journal bearings in internal combustion engines

Lorenz

Offner

Knaus

2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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Hydrodynamic journal bearings are essential components in the internal combustion engines. The prediction of their reliability, durability, and economy, and also of their friction loss power and wear, are of highest importance. For an appropriate representation of the hydrodynamic load-carrying capacity and also the friction behavior, the multibody dynamics of the contacting components, the shape of the contacting component surfaces, the amount of the available lubricant, and the properties of the lubricant itself are of importance. A Reynolds-averaged equation with laminar flow conditions in combination with a dry asperity contact model and a multibody dynamic simulation of the structural components is a typical modeling approach for that purpose. Furthermore, this paper shows a newly developed model for the temperature distribution in the lubricant and the bearing structures. It includes thermal interface conditions between these domains, which incorporates the asperity energy source and predicts the temperature in supply areas. The presented method is applied for a typical engineering task of a sensitivity analysis for oils with different viscosity index improvers in a main bearing of a four-cylinder inline diesel engine. The influence of the oil film temperature on the oil film viscosity and, therefore, on the load-carrying capacity is shown. Furthermore, the simplified two-dimensional approach is compared with a three-dimensional approach in terms of the obtained result. The presented results show similar accuracy of the two-dimensional approach compared to the equivalent three-dimensional case.

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Thermo‐elasto‐hydrodynamic lubrication model for journal bearing including shear rate‐dependent viscosity

Cited by 37 publications

References 11 publications

Tribo-design of lubricants for power loss reduction in the oil-film bearings of a process industry machine: Modelling and experimental tests

Tribo-design of lubricants for power loss reduction in the oil-film bearings of a process industry machine: Modelling and experimental tests

Friction in Automotive Engines

Thermal analysis of hydrodynamic lubricated journal bearings in internal combustion engines

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