Sound transmission loss of metamaterial plates with periodically attached local resonators

This work is concerned with the study of sound transmission loss (STL) of metamaterial plates comprising periodic arrays of local resonators attached to a host plate. The influences of the periodic lattice constant, the resonator mass, and the damping of the resonators and the host plate, on the STL are analysed systematically by using a plane wave expansion (PWE) method. It is shown that the lattice constant can affect the STL in a dramatic way, which provides new guidelines for designs aiming at lower frequency sound insulation.