Sound transmission control through optimized composite sandwich lattice panels
06 - 13 - 20 - 27 April 2022, 15:00-17:00 CEST
This course provides an overview of recent developments in sound transmission control through aeronautical panel structures. In the first part, general definitions of the sound transmission efficiency parameters are given; moreover, the classical and advanced structural models used to analyze sandwich structures are depicted. In the second part of the course, the attention is focused on recent industrial interests such as 3d-printed lattice materials used for the design of sandwich cores, the homogenization of the lattice material properties is introduced. Furthermore, the passive damping of the multilayered panels can be improved by using soft viscoelastic materials; therefore, their modelling with classical Kelvin-Voigt or fractional derivatives models is explained. In the last part of the course, the structural optimization problem is introduced; the original contributions of the authors define a new particle swarm optimization model called the Population Decline Swarm Optimization method. Finally, some case studies concerning the sound transmission control through optimized multilayered shell composite sandwich panels with lattice core embedding viscoelastic sheets are discussed.