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PARTICULATE DAMPERS FOR ABSORPTION OF STRUCTURAL VIBRATIONS AT AUDIBLE FREQUENCIES

Abstract

Absorption of mechanical vibration by particulate material versus frequency are investigated, with the goal to mitigate transmission of vibrations into building structures. Attenuation of vibration by particulates depends mainly on their mechanical properties, shape, size-distribution, and degree of compactness. Structural vibrations can be damped by surrounding them with particulate materials. Results show that, particulate dampers behave as band-pass filters for vibrations that pass through them. The frequencies outside their passband range are strongly absorbed. Some particulate materials have a frequency band-gap, where frequencies in the bandgap range are strongly attenuated. Samples of uniform size partcles are subjected to the mechanical vibrations at different frequency and amplitude. Their absorption are measured versus frequency, as a function of layer thickness, particulate size, and orientation, at different frequencies. The main goal is to determine optimal vibration dampers to mitigate transmission of external mechanical into the structures.

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