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Title of Journal: Microsyst Technol

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Abbravation: Microsystem Technologies

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Springer-Verlag

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DOI

10.1016/0167-5699(96)10022-0

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1432-1858

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A study of acoustic noise generating mechanisms of

Authors: H Zheng J Q Mou F Gao W Z Lin E H Ong
Publish Date: 2009/01/29
Volume: 16, Issue: 1-2, Pages: 143-
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Abstract

A combined experimental and numerical study of the acoustic noise from a small form factor hard disk drive HDD is made to investigate the relative contribution of structureborne idle noise to the total generated noise Initially the idle noise of a 18″ HDD was measured in an anechoic chamber and a clear highfrequency peak is found in its total idle noise frequency spectrum Then the modeling and simulation MS of the top cover vibration and the associated sound radiation are performed to identify the dominant source and transmission path causing this noise peak The MS process consists of a 3D structural finite element FE modeling of the HDD to calculate the frequencydomain vibration response of the top cover and a boundary element BE modeling of the HDD for calculating the radiated sound pressure The loading specified in the FE model is motor torque ripple the dominant electromagnetic excitation of fluid dynamic bearing spindle motor for HDDs Finally the obtained acoustic BE results of the sound pressure levels at a selected field point are compared to those measured physically in the chamber It is shown that for the HDD considered the coincidence of a highfrequency resonant mode with the fifth harmonic frequency of motor torque ripple is responsible for the highfrequency peak noise in the idle noise spectrum

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