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Georgia Journal of Science

Article Title

ATTENUATION OF GROUND-BORNE BUILDING VIBRATIONS BY PARTICULATE MEDIA AT THE AUDIBLE FREQUENCIES

Abstract

Ground-borne building vibration can be damped by particular media placed between the building structure and the vibration source. Particulate damper of uniform particle size has been shown to have characteristics of a bandpass filter for a range of mechanical vibration frequencies. The absorption-spectrum of particulate damper shows frequency bandgap, where mechanical vibrations in that specific frequency range are strongly absorbed. We use samples of uniform size particulates medium, of fixed layer thickness. The samples are subjected to mechanical vibrations in the audible frequency range from 2 Hz to 10 kHz to determine their absorption characteristics as a function of particle size, frequency, vibration amplitude, and transmission direction. The goal of this study is to find vibration absorption spectrum as a function of particle size, and required layer thickness to mitigate the external sources of building vibrations.

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