Development of codes for estimating minimum film thickness, traction and sub-surface stresses for lubricated ball bearings.
 
Numerical analysis of lubricated point contact problems is carried out considering the surface roughness effect, variation of viscosity with pressure and elastic deformation. Pressure distribution, film thickness and traction coefficient are estimated for a desired load. The hydrodynamic (Reynolds) and elastic deformation equations are solved simultaneously using finite difference method with SOR scheme. Thereby the surface and sub-surface stresses are calculated. A software (EHD-SOLVER) is developed under this project work (P.O. 20031818, Indian Institute of Technology, Kharagpur, India), which is verified and validated by GE India Technology Center Pvt. Ltd.
Client: GE India Technology Center Pvt. Ltd., Bangalore, India.

Development of codes for analysis of Herringbone groove bearings for zero-leakage condition of operation.
 
Steady state and dynamic characteristics of fluid film stability including stiffness and damping of hydrodynamic herringbone groove journal bearing are carried out considering zero leakage condition of operation. Zero leakage operating condition of a bearing is proposed with the help of theories concerning the breakdown of air-liquid interface. Reynolds equation is solved using finite difference method with SOR scheme to estimate load capacity and end leakage under the same operating condition. Dynamic coefficients of the bearing are calculated using linear perturbation method. Finally stability margin of the hydrodynamic herringbone bearing is determined. A software (HGB-SOLVER) is developed under this project work (P.O. 20032168, Indian Institute of Technology, Kharagpur, India), which is verified and validated by GE India Technology Center Pvt. Ltd.
Client: GE India Technology Center Pvt. Ltd., Bangalore, India.