Acoustic Attenuation Of Porous Ceramics

The elastic wave propagation in piezoelectric ceramics with pore volume fractions up to 0 6 has been investigated.

Acoustic attenuation of porous ceramics.

After choose the appropriate type of passive noise control we have to characterize it find the best model and parameters and optimize it according to the application. Most media have viscosity and are therefore not ideal media when sound propagates in such media there is always thermal consumption of energy caused by viscosity. Acoustic attenuation is a measure of the energy loss of sound propagation in media. For inhomogeneous media besides media viscosity acoustic scattering is another main reason for removal of acoustic energy.

Us9068346b1 acoustic attenuators based on porous nanostructured materials google. A new application of porous ceramics as the attenuative backing element in high temperature transducers is introduced. The samples have been prepared by t. Characteristic attenuation exhibited by granular materials over an extended frequency range.

Rigid frame porous material acoustic attenuation on compressor discharge. The invention is directed to a porous acoustic attenuating composition wherein the composition comprises a nanostructured material and wherein the composition exhibits acoustic transmission loss ranging from 20 to 60 db cm thickness of the composition.