Digital Commons Network^™

The Effect Of Edge Constraints On The Surface Normal Impedance Of Layers Of Elastic Porous Materials, N.-M. Shiau, W. Desmet, J Stuart Bolton

Publications of the Ray W. Herrick Laboratories

A two-dimensional model for wave propagation in elastic porous materials has been used to investigate the effects of edge constraints on the surface normal impedance of elastic porous materials when placed in standing wave tubes. The elastic porous material model used was based on the Biot theory and takes into account the three wave-types known to propagate within elastic porous materials. Previous work has indicated that the acoustical behavior of typical noise control foams can be very sensitive to small mounting details. Consequently, it is reasonable to expect that the surface normal impedance measured by placing foam in a standing …