Multilayered Porous Material: Poroelastic Waves with Thermal and Viscous Losses (Biot-Allard Model)

Application ID: 34531

In applications where pressure waves and elastic waves propagate in porous materials filled with air both thermal and viscous losses are important. This is typically the case in insulation materials for room acoustics or lining materials in car cabins. Another example is porous materials in mufflers in the automotive industry.

The present models shows how the Biot-Allard (or Biot-JCA) model option of the Poroelastic Waves physics interface is used to model a multilayered porous structure composed of two foam layers, one thin screen, and a blanket. The surface impedance of the system is determined and can be compared to results from a JASA paper.

This model example illustrates applications of this type that would nominally be built using the following products: