Abstract
The objective of this study to explore the rotordynamic characteristics of a hydrodynamic grooved journal bearing (HGJB) filled with ferrofluid lubricant via finite element analysis. Small-sized HGJBs nowadays serve well as the candidates for supporting high-speed rotating spindles of data-storage drives; such as hard disc drives and optical disc drives. The analysis herein on HGJBs is expected to distill design guidelines with main goals of reaching higher stiffnesses and simultaneously owns largest stability margin. To fulfill the aforementioned goal, the present study starts with building the mass flux equations of the HGJBs filled with ferrofluid, which is followed by discretization over the bearing clearance domain and derivation of finite difference equations based on mass flow balance. Finally, the pressure distribution of fluid film, stiffnesses, damping coefficients, and critical mass are computed. Results show the usage of the ferrofluid owns the capability to alter and improve the general dynamic characteristics of a hydrodynamic grooved journal bearing.
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