Mechanical vibrations attenuation by granular media at audible frequencies for especial applications


Absorption of structural vibrations by granular media is investigated to prevent transmission of vibrations into the structures by surrounding the structure with granular media. Mechanical properties of media are selected for specific vibration absorption characteristics. Experimental results show that frequency band-gap of the media can be moved by design to fit the required frequency band, where scattering and dissipation of vibrational energy is maximum. Samples of granular media are subjected forced mechanical vibrations at different audible. The attenuation versus frequency are determined. Effects of thickness, particle size, and medium compactness, are investigated at different frequencies and intensity. The goal is to obtain granular media properties required for maximum vibration attenuation for especial applications of vibration free structures.

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