Accession Number : ADA539264


Title :   Nonlinear Acoustic Metamaterials for Sound Attenuation Applications


Descriptive Note : Final rept.


Corporate Author : CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED SCIENCE


Personal Author(s) : Yang, Jinkyu ; Daraio, Chiara


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a539264.pdf


Report Date : 16 Mar 2011


Pagination or Media Count : 28


Abstract : We design and test nonlinear acoustic materials for amplitude dependent filtering of audible signals. We study the dynamic response of one-dimensional arrays of elastic particles in contact with each other, supported by deformable elastic rods, using experiments and numerical simulations. We study the effects of different curvatures of the support rods on the transmission of impacts and structural vibrations. We find that the combination of a nonlinear granular medium with linear support rods allows obtaining tunable filtering of the incoming signal, and selecting desired ranges of the transmitted frequency and amplitude. We conclude our study building a 3D prototype of the new filtering material using a 3D printer.


Descriptors :   *NONLINEAR SYSTEMS , *ACOUSTIC ATTENUATION , *ACOUSTIC MATERIALS , ELASTIC PROPERTIES , PROTOTYPES , THREE DIMENSIONAL , SOUND , AMPLITUDE , ONE DIMENSIONAL , DEFORMATION , VIBRATION , LINEAR FILTERING


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE