... method and includes the equation of wave propagation in rigid frame porous material. The compression of fibrous material is entered to the model with relations that explain modifications of physical properties used in the wave equation. Acoustical behavior of absorption and barrier materials...

... 03 2006 structural acoustics vibrations inverse problems porous materials Fourier transforms porous media tunnel moving load Biot’s theory the Fourier transformation Recently, considerable efforts have been devoted to the problem of the interaction between high-speed...

...Francisco Simo´n; Rosa M. Rodrı´guez; Jaime Pfretzschner A classical way of improving acoustical absorption performances of porous materials is the use of corrugated surfaces; this use can obtain lower cut-off frequencies and also improve the overall absorption over a wide frequency range...