Vibro-acoustic interaction of microsystem components in data storage devices

Abstract

Vibro-acoustic characteristics of compact data storage devices are not well understood. This study examines fundamental research issues of structure-borne noise through the sample case of 3.5-in personal computer hard disk drives. This structure-borne noise is generated from the surface vibration, including the top cover and the base plate, which is induced by the motion of the internal components transmitted through screws and rigid connections. Therefore, vibro-acoustic analysis of a HDD is divided into two analyses: vibration analysis and acoustic analysis. iii Table of Contents iv List of Figures vii List of Tables xii Nomenclatures xiii Chapter 1 Chapter 2 Review of vibro-acoustic analysis in HDDs 2.1 Structure of a typical hard disk drive 2.2 Hard disk drive technology trends and challenges 2.3 Specifications in vibro-acoustic analysis of HDDs 2.3.1 Acoustic specifications 2.3.2 HDD noise specifications 2.4 Literature review on vibro-acoustic analysis in HDD 2.4.1 Vibration modes of spinning disks 2.4.2 Vibration modes of head actuator assembly 2.4.3 Review on vibro-acoustic analysis in HDD 2.5 Experimental studies of vibro-acoustics in HDDs 2.5.1 Velocity measurement of the top cover 2.5.2 Sound radiation measurement 2.6 Summary Chapter 3 Noise Source Mechanisms and Noise Control Methods 3.1