Tilt Angle Effects on the Dynamic Performance of Micropolar LubricatedNoncircular Three Lobe Journal Bearing

In case of noncircular lobed journal bearings, lobes canbe rotated around their centers. Rotation of each lobefrom its conventional position can be considered as adesign parameter and is defined as tilt angle. Presentstudy is concerned with the evaluation of tilt angleeffects on the steady state and stability performance ofhydrodynamic micropolar lubricated three lobe journalbearings. For this purpose, the Reynolds equation indynamic state is modified considering the micropolaritycharacteristics of lubricant and then it is solved usinggeneralized differential quadrature (GDQ) method. Theinfluence of tilt angle on the bearing performance ispresented in terms of load carrying capacity, whirlfrequency ratio and critical mass parameter. It isobserved from the results that tilt angle has a significanteffect on the static and dynamic behavior ofhydrodynamic noncircular bearings. Results show thatany change in the position and orientation of bearinglobes can affect the operating conditions of rotor-bearingsystem while other bearing design parameters andlubricant characteristics are kept fixed.

کلیدواژه ها:

Three lobe journal bearing ، Tilt angle ، Hydrodynamic micropolar lubrication ، Stability analysis ، GDQ method