Design of a noise reduction passive control system based on viscoelastic multilayered plate using PDSO

The sound transmission and insulation of aeronautical panels represents one of the major problem of the aircraft comfort. In the present work, a plate finite element with advanced higher-order kinematic field is proposed for the analysis of noise reduction passive control system in laminated structures. A novel Decline Population Swarm Optimization (PDSO) procedure is introduced and used to select the optimal parameters for the sound control. The present sound insulation passive control is based on Finite Elements obtained by applying the Principle of Virtual Displacements, taking into account the frequency dependence of the viscoelastic material, making use of higher-order Layer-Wise theories, and employing the Mixed Interpolated Tensorial Components (MITC) method to contrast the shear locking effect. The PDSO procedure is based on a decline demographic model and is characterized by high global search capabilities with reduced computational costs. The acoustic insulation of the panels is evaluated by computing its sound transmission factor using Rayleigh integral method. Several numerical investigations are carried out to validate and demonstrate the accuracy and efficiency of the acoustic optimization procedure for the design of viscoelastic plates. (C) 2019 Elsevier Ltd. All rights reserved.