Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
NUMERICAL AND ANALYTICAL ANALYSIS OF TRANSMISSION LOSS OF PANELS WITH INSERTION OF HELMHOLTZ RESONATORS AND POROUS MATERIAL
Submission Author:
Matheus Veloso , SC
Co-Authors:
Arcanjo Lenzi, Sergio Aguirre, Ricardo Scremin Rizzatti, WAGNER SANTOS, Matheus Veloso
Presenter: Matheus Veloso
doi://10.26678/ABCM.COBEM2017.COB17-2686
Abstract
Reducing noise in the cabin of an aircraft has been a difficult task, because there is the need to use materials that increase transmission loss without increasing the weight of the structure. Currently, a way to increase the transmission loss of the joint without the weight is increased too, is to add porous material between the outer and inner panels of the cabin of an aircraft. However this technique does not solve all the problems, because there are lower frequencies that have a considerable share in the sound transmission. To try to solve this problem this work have studied the transmission loss of panels with insertion of resonators in porous materials.In this paper a numerical model has been developed with the goal of determining the transmission loss of the assembly: panels, porous material and resonators. The results obtained were compared with an analytical model of transfer matrices order to evaluate if the same is the physical behavior of the analyzed system.
Keywords
Transmission Loss, Helmholtz resonator, Porous materials, Panels, Numerical simulation, analytical model
