Sound transmission loss of composite and sandwich panels in thermal environment

摘要: Abstract Composite sandwich structures are extensively applied in automotive, marine, aircraft because of superior stiffness-to-weight ratios. These invariably exposed to the thermal and noise environment their service life especially as a component hypersonic aircraft. The paper is originally focused on sound transmission loss (STL) panels constituted orthotropic materials environment. Firstly, governing equations obtained by applying Hamilton's principle. Both natural frequencies corresponding mode functions derived with stresses taking into account. formulation STL using superposition method. Then published experimental result numerical simulation demonstrated validate accuracy analytical solution. Finally, influences temperature, elevation angle azimuth incident finite investigated systematically. It observed that panel decrease peaks tend drop flow lower increment temperature. decreases angle.