Experimental dynamic characterizations and modelling of disk vibrations for HDDs

Currently, the rotational speed of spindle motors in HDDs (Hard-Disk Drives) are increasing to improve high data throughput and decrease rotational latency for ultra-high data transfer rates. However, the disk platters are excited to vibrate at their natural frequencies due to higher air-flow excita...

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Bibliographic Details
Published in:ISA transactions 2008, Vol.47 (1), p.85-93
Main Authors: Pang, Chee Khiang, Ong, Eng Hong, Guo, Guoxiao, Qian, Hua
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Computer Simulation
Disk mode shapes
Electronics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Hard-disk drives
Linear Models
Magnetic and optical mass memories
Microcomputers
Models, Statistical
Physics
Rotation
SLDV
Solid mechanics
Storage and reproduction of information
Structural and continuum mechanics
Vibration
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:Currently, the rotational speed of spindle motors in HDDs (Hard-Disk Drives) are increasing to improve high data throughput and decrease rotational latency for ultra-high data transfer rates. However, the disk platters are excited to vibrate at their natural frequencies due to higher air-flow excitation as well as eccentricities and imbalances in the disk-spindle assembly. These factors contribute directly to TMR (Track Mis-Registration) which limits achievable high recording density essential for future mobile HDDs. In this paper, the natural mode shapes of an annular disk mounted on a spindle motor used in current HDDs are characterized using FEM (Finite Element Methods) analysis and verified with SLDV (Scanning Laser Doppler Vibrometer) measurements. The identified vibration frequencies and amplitudes of the disk ODS (Operating Deflection Shapes) at corresponding disk mode shapes are modelled as repeatable disturbance components for servo compensation in HDDs. Our experimental results show that the SLDV measurements are accurate in capturing static disk mode shapes without the need for intricate air-flow aero-elastic models, and the proposed disk ODS vibration model correlates well with experimental measurements from a LDV.
ISSN:0019-0578
1879-2022
DOI:10.1016/j.isatra.2007.05.008