Acoustic absorption material optimisation in the mid–high frequency range

Abstract

a b s t r a c tAcoustic modelling, applicable to poroelastic materials in a wide frequency range, is time consuming. This paper offers an energy method for optimising absorption coefficients at the boundaries of an acoustic cavity. The influence of absorption coefficients on this proposed energy method will be examined first. The next step will seek to optimise the location of absorbing materials. Numerical results will prove the method's effectiveness. Improvements in the overall optimisation process will also be proposed. A model based on polynomial interpolations will be developed in order to further reduce time consumption.

Phase structures, loss, storage, damping, voice-absorption, and mechanical properties: NCB/BWZT/RTV

“…Elastomer based on piezoelectrics have become attractive structural and functional noise absorption composites [1][2][3] in the eld of industrial production, aerospace [4] , marine, automobile, railways, civil engineering [5] , electron, machine and cable industries [11][12] , entertainments [6] etc. due to the moderate hardy and elasticity, being easy in perception and processing to environmental signals [7] , design abilities in performances [8] , combinations in high di-electricity of ceramics and insulativity of polymers [9][10] , according with the need of high dielectric, ease to processing and so on.…”

Phase structures, loss, storage, damping, voice-absorption, and mechanical properties: nano-carbon black/BWZT/RTV

“…Elastomer based on piezoelectrics have become attractive structural and functional noise absorption composites [1][2][3] in the eld of industrial production, aerospace [4] , marine, automobile, railways, civil engineering [5] , electron, machine and cable industries [11][12] , entertainments [6] etc. due to the moderate hardy and elasticity, being easy in perception and processing to environmental signals [7] , design abilities in performances [8] , combinations in high di-electricity of ceramics and insulativity of polymers [9][10] , according with the need of high dielectric, ease to processing and so on.…”

Acoustic impedance sensitivity approach for defining absorbing material layout using the wave based method

“…Zhang et al [10] developed a formulation of the acoustic impedance sensitivity analysis based on the indirect BEM. Totaro et al [11] applied the patch transfer function method to find the efficient positioning of absorbing material at the boundary of a cavity, and Besset et al [12] adopted the simplified energy method for optimizing the acoustic absorption coefficients in the mid-high frequency range.…”