ME60404: Lubrication And Rotor Dynamics

ME60404
Course name	Lubrication and Rotor Dynamics
Offered by	Department of Mechanical Engineering
Credits	4
L-T-P	3-1-0
Professor(s)	Mihir Sarangi
Venue(s)	NR324
Previous Year Grade Distribution
4 4 7 14 9 5 EX A B C D P F
Semester	{{{semester}}}

Syllabus

Syllabus mentioned in ERP

Introduction: Rotating machinery, Technology of friction control and wear prevention in rotating machinery, Properties and testing of lubricants. Bearing Systems: Rolling element bearings, Hydrodynamic oil-journal bearings, Gas lubricated bearings, Hydrostatic bearings and Squeeze film bearings Rotor Dynamics: Single degree of freedom system, Multi degree of freedom system, Shaft with central disc, Shaft with non central disc Rotor-bearing systems: Rotor supported on rolling element bearings, rotor supported on oil journal bearings, stability analysis (rigid rotor, flexible rotor), Rotor with several bearings and discs (FEM): Equation of motion with Rigid masses, Beam elements and Bearing supports, Modelling of Internal damping, Drive-Rotor interactions, Natural vibration and forced vibration studies. Measurement and diagnostics in rotating machinery: Signal measurement and processing, fault prediction such as unbalance, misalignment, rubbing, bending, loose components, rotor crack and bearing faults.

Concepts taught in class

Lubrication and rotor dynamics is a more applied subject which sees a great deal of both machine dynamics and fluid mechanics.

Important topics include(until mid-semester):

1. Derivation of 2D Reynold's equation from Navier Stokes and Momentum Conservation
2. Mechanism of pressure development in lubrication
3. Different lubrication regimes and Stribeck curve
4. Hydrodynamic bearings
   1. Plane Slider bearings
   2. Roller element bearing
   3. Journal Bearing
   4. Thrust bearing

Student Opinion

It is important to attend classes, and the lectures are very interactive. The simulation assignments give one a firm grasp of the concept.

How to Crack the Paper

1. Practice previous years' questions papers, over 90% is repeated verbatim.
2. Practice derivations

Classroom resources

Notes are more than sufficient.

Suggested reference books

"Theory of LUbrication" by M K Ghosh, B C Majumder, Mihir Sarangi