PAMM

Description

Software PAMM (Propagation of Acoustic waves in Multilayered Media) developed in the Applied Mathematics department of the University of Santiago de Compostela, allows us to predict the pressure field in stratified media formed by materials of different acoustic characteristics. It is assumed that the pressure field is given by the sum of plane waves with oblique incidence in the multilayered media. So for each set of data, a one-dimensional problem is solved exactly without any discretization procedure.

With this software, the layered media can be made with multiple layers modeled as viscid compressible fluid, visco-elastic solid, rigid or elastic plates (with or without composite structure), porous media (rigid or elastic, with open or closed pores,...), wall impedances surfaces, porous veils, and so on.

The physical data set of each one of the materials, which form the multilayered media, are introduced in the code by using a intuitive graphic interface. The next step is running the exact solver for plane wave analysis that PAMM provides. Finally, it allows us to hand a wide variety of levels and coefficients for analyzing the acoustic behavior associated to the multilayered media: the sound pressure level, the transmission loss, the reflection coefficient, the absorption coefficient, the input impedance, and the output impedance.

Moreover, software PAMM writes an output table with the complex values of each one of the levels and coefficients detailed above, and represents two-dimensional contour plots with respect to any two physical magnitudes in the input data set that the PAMM user has chosen. Additionally, the solution of the acoustic propagation problem in the multilayered media can be visualize by using an animation in the time-domain.

Finally, we must remark that the code of software PAMM has been developed in MATLAB.