Dynamic Characteristics of a Hard Disk Drive Spindle System Due to Imperfect Shaft Roundness
- Authors
- Koak, Kyu Yeol; Kim, Hak Woon; Jung, Kyo Min; Jang, Gun Hee
- Issue Date
- Nov-2009
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Dynamic behavior; fluid dynamic bearings (FDBs); groove; Reynolds equation; roundness
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, v.45, no.11, pp.5148 - 5151
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MAGNETICS
- Volume
- 45
- Number
- 11
- Start Page
- 5148
- End Page
- 5151
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/175937
- DOI
- 10.1109/TMAG.2009.2029642
- ISSN
- 0018-9464
- Abstract
- This paper proposes a modified Reynolds equation for the coupled journal and thrust fluid dynamic bearings (FDBs) to include variable film thickness due to imperfect roundness of a rotating shaft. A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear stress along the fluid film. The dynamic behavior of a hard disk drive (HDD) spindle system is investigated by solving the equations of motion with six degrees of freedom using the Runge-Kutta method. This research shows that the imperfect roundness of the shaft increases the nonlinearity of FDBs. Imperfect roundness of the shaft generates harmonics of the groove number 1 in the bearing reaction force and the displacement of the HDD spindle system even in the case of stationary grooved FDBs.
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