Abstract
Metamaterials made of resonant building blocks based on Helmholtz resonators have been developed as perfect acoustic absorbers. The performance of these metamaterials is analyzed when used to control the scattering of noise during a space vehicle lift-off. In this event, two main contributions of sound should be controlled: i) the reflected from the launch pad and ii) the transmitted through the faring wall. Numerical models are developed to predict the vibro-acoustic response of two metamaterials designed for these two problems. The approach is to simplify the numerical model by obtaining a simplified panel with equivalent acoustic and mechanical behavior on the frequency range of interest. The first solution is based on a rainbow trapping structure that will be applied as an exhaust channel cover. Later, an ultra-thin perfect absorber is designed to be added to the fairing composite sandwich. Results show a significant noise reduction while small effects of the vibro-acoustic coupling are theoretically and numerically observed. The developed methodology enables a simplification in the noise control analysis and opens the way for its use in other applications.
BibTeX citation
@inproceedings{MaraINTERNOISE2021,
author = {Mara Escartí-Guillem and Pablo Barriuso Feijoo and Alejandro Cebrecos and Marcos Chimeno-Manguán and Pedro Cobo and Luis M García-Raffi and Jean-Philippe Groby and Sergio Hoyas and Noé Jiménez and Mario Lázaro and Julien Leng and José Nieto and Rubén Picó and José Manuel Requena-Plens and Elena Riobás and Vicente Romero-García and Víctor José Sánchez-Morcillo and Francisco Simón},
booktitle = {EuroNoise 2021: European Congress and Exposition on Noise Control Engineering. Madeira, Portugal. 24-27 October},
doi = {http://www.sea-acustica.es/},
editor = {Conference proceedings},
month = {10},
organization = {Sociedade Portuguesa de Acústica},
pages = {1287-1296},
series = {Oral},
title = {Application of metamaterials to control noise scattering during space vehicle lift-off},
url = {http://www.sea-acustica.es/},
year = {2021}
}