VISCOELASTIC PHONONIC CRYSTAL

摘要

A sound barrier and a method of making a sound barrier are disclosed. The sound barrier comprises a first medium comprising a viscoelastic material, and a second medium having a density smaller than the first medium, configured in a substantially periodic array of structures and embedded in the first medium. The method comprises selecting a first candidate medium comprising a viscoelastic material having a speed of propagation of longitudinal sound wave, a speed of propagation of transverse sound wave, a plurality of relaxation time constants; selecting a second candidate medium; based at least in part on the plurality of relaxation time constants, determining an acoustic transmission property of a sound barrier comprising a substantially periodic array one of the first and second candidate media embedded in the other one of the first and second candidate media; and determining whether the first and second media are to be used to construct a sound barrier based at least in part on the result of determining the acoustic transmission property.