Document Type : Review Paper


1 Mechanical Engineering, UOT, Iraq

2 University of Technology-Iraq

3 Mechanical Engineering, UOT, Iraq, Baghdad


The purpose of this paper is to present a vibration monitoring analysis of a hydrodynamic journal bearing working with nano-additives lubricants.The vibration response is generated on bearings at various rotational speeds and dynamic load conditions.These bearings were tested experimentally by adding two types of nano additives; Bismuth (3) oxide (Bi2O3), which is considered a green, nontoxic metal, as well as a new additive, and nano Titanium dioxide (TiO2), which is moderately toxic, with SN150 base oil.The performance of additives was studied on the base oil. The comparisons between the two nano-additives Bi2O3 with (1, 2, and 4 wt. %) and TiO2 with (1 and 1.25 wt. %) were studied experimentally with the SN150 base oil. And the obtained results manifested that at different concentrations of Bi2O3 and TiO2 in the SN150 base oil for each rotational speed and dynamic load, there was a reduction in the vibration system response, where Bi2O3 has a good performance at a wide range of rotational speed and dynamic load. At the same time, TiO2 performs better at higher rotational speed and dynamic load.

Graphical Abstract


  • This research is a new study for the use of nanoadditives to improve the properties of oil free of any additives.
  • The purpose of this study is reducing vibrations in the journal bearings as a result of changing loads and speeds.
  • The effect of different dynamic loads and the concentrations of nanoparticles were tested through monitoring the vibration response on the journal bearing of the rotor-bearing system.


Main Subjects

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