A comparative performance assessment of a hydrodynamic journal bearing lubricated with oil and magnetorheological fluid

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Rheological texture in a journal bearing with magnetorheological fluids

Experimental results on a hydrostatic bearing lubricated with a magnetorheological fluid

Study on MR fluid hybrid hole-entry spherical journal bearing with micro-grooves

This review paper highlights the tribological behaviour and performance of smart fluids. Two main kinds of smart fluids, that respond to a suitable external stimulus are investigated – electrorheological and magnetorheological fluid. The excitation of an external active field significantly increases or decreases the fluidity, depending on the fluid type. First, the tribological behaviour of both types of smart fluids without the influence of an external field and under the external active field, respectively, are reviewed. Subsequently, the influence of external field activation on the lubricating layer is described. Finally, a summary of the most notable findings of investigated smart fluids performance and behaviour is provided. Possible future applications are then considered for smart lubricants technology and engineering devices. © 2018 Published by Faculty of Engineering Corresponding author: Petr Svoboda Brno University of Technology, Technicka 2896/2 Brno, Czech Republic. E-mail: petr.svoboda@vut.cz

Tribological Behaviour of Smart Fluids Influenced by Magnetic and Electric Field – A Review

Variations in frictional force developed in the journal bearing lubricated with Magnetorheological (MR) fluid was investigated. Also, a comparative study was conducted between MR fluids and SAE15W40 grade engine oil on the performance characteristics. A test bearing set-up was developed to accommodate MR fluid film with provision for varying magnetic field. MR Fluid was formulated by dispersing electrolytic grade micron sized iron particles in silicon oil base fluid in 0.3 volume fraction. The results of the experimental testing indicated an increase in frictional force with increasing excitation current in the electromagnetic cores of journal bearing for similar loads and speeds in comparison to plain engine oil; the presence of MR fluid causes an increase in viscosity in comparison to plain engine oil and thus holds a great potential to increase the load carrying capacity of the journal bearing.

Nirmal Roy

Papers

Experimental Investigation of Frictional Force in a Hydrodynamic Journal Bearing Lubricated with Magnetorheological Fluid