The article discusses the issues of accounting direction pattern parametric antenna array propagation sound over Earth’s surface. As a radiator, is used. A description given measuring equipment and experimental research methods. Delaney-Bezley model was used as surface impedance. results showed importance in predicting pressure level propagating acoustic signal On example difference with freque...

Sound propagation in the sonic crystal (SC) along the symmetry direction is modeled by sound propagation through a variable cross-sectional area waveguide. A one-dimensional (1D) model based on the Webster horn equation is used to obtain sound attenuation through the SC. This model is compared with two-dimensional (2D) finite element simulation and experiment. The 1D model prediction of frequen...