Bearing Modulus and Bearing Characteristic Number of Journal Bearing

Design of Journal bearing is based on bearing modulus. the section of lubricants for Hydrodynamic journal bearings are done based on the bearing characteristic number.
This video explains the selection of bearing lubricants and the design considerations of journal bearings.

[@longBowHunterII]

Nice explanations and examples

[@Amitkumar-ur2ly]

very good explanation...loved it

[@omarmortagy9142]

Dear Sir, thank you very much for the excellent video. I have a question please: as ZN/p increases to 2K, 3K, or more, the coefficient of friction also increases although this is in the thick film lubrication (stable) phase. I am a bit confused because I should be designing for the thick film lubrication phase to minimize friction, but as per the graph the coefficient of friction is also increasing! Isn't this contradicting? Thank you. Omar

[@KTUWeb]

Hydrodynamic bearings are designed for fluid film lubrication, high value for K may change this to fluid lubrication. A shaft bounded with very very thick layers of fluid will not provide precise rotation.

[@rohithprakash1661]

Yes as the ZN/P increases to become stable the coefficient of friction also increases and it increases heat generation which results in increase in temperature as viscosity is inversely proportional to temperature viscosity decreases which decreases ZN/P and thus returns into stable position and this repeats in floating manner.

[@harshadldce]

More increase in viscosity more power required to overcome film thickness bcs viscosity is simply resistance to flow so more increase in friction . We need optimum film thickness more than K

[@harshadldce]

Many Thanks Sir, You have explained so simplistic way

[@SK-cb6wz]

Thanks

[@akshayakumarsamantara8865]

Very nice

[@ramarajupr3895]

Sir will you can upload on "shaft,key and coupling" =topic Basic topics in it is : -Shaft material and size. -Design of shaft. (based on strength, design of axle, combined torsion and bending, based on rigidity) -design of sunk key. -design of muff coupling. -design of flange coupling.

[@nikitakadam2322]

Well explained👌

[@shivasmart967]

tq sir

[@surajhowalofficial2310]

Sir bearing characteristics no in hydrodynamic bearing depends on safer design or cost effective design sir plz clear the doubt

[@KTUWeb]

It depends upon both, it assure minimum oil filmi thickness and it also act as limiting factor for design by avoiding over designs. The grade of oil can be determined by this factor, hence maintenance cost can also be controlled.

[@manojjohnvarghese6602]

Good explanation... Thank you