A Study of Dynamic Characteristics and Vibration Suppression of HDD by Using Gaussian Model
Date Issued
2011
Date
2011
Author(s)
Cho, Chia-Rong
Abstract
The main contribution of this thesis is to investigate the dynamic characteristics of hard disk drive (HDD) under perturbation, and to suggest suitable boundary conditions for enhancing its stability. Free, fixed and damping conditions are analyzed by using Hertzian contact theory, Gaussian function, and short-time Fourier transform. After the impulse points and measuring points are designed via infrared thermography and laser displacement measurement, impulse and response signals are provided from impact hammer and fiber-optical measurement system. To analyze the physical traits both in time and frequency domain, the analytical methods are applied to the empirical signals, and presented abundant results related to dynamic characteristics. In the analyses of time domain, the main traits of dynamic response are contact time and maximum contact force; in the analyses of frequency domain, the important features are resonant frequency and frequency spectrum. By analyzing the physical traits in different boundaries, damping condition provides prior ability of anti-vibration. Though there are some shortages in different analytical and experimental methods, the thesis still successfully establishes one kind of damping condition, and confirms its ability based on the abundant theoretical and experimental analyses. In the future work of optimization, the finite element method is a practical solution, and indicates suitable locations of damping foil.
Subjects
hard disk drive
Hertzian contact theory
Gaussian function
impulse
dynamic response
impact hammer
laser displacement measurement
fiber-optical measurement system
Type
thesis
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