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DIGITAL.CSIC
Conference object . 2008 . Peer-reviewed
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Control activo global multicanal del ruido de baja frecuencia en recintos

Authors: Bravo, Teresa; Cobo, Pedro;

Control activo global multicanal del ruido de baja frecuencia en recintos

Abstract

[ES] En este trabajo se ha realizado una verificación experimental de las posibilidades de las técnicas de Control Activo del Ruido (CAR) en recintos. Concretamente, en un recinto paralelepipédico de dimensiones 6.81 x 5.23 x 3.38 m, ligeramente amortiguado y excitado armónicamente. Debido a que la forma del recinto se adapta perfectamente a coordenadas cartesianas y trabajamos en un margen de bajas frecuencias, la ecuación de ondas es exactamente resoluble y podemos expresar la solución utilizando teoría de modos normales sin necesidad de recurrir a procedimientos numéricos más complicados. Para medir la respuesta global del recinto se utiliza la energía potencial acústica medida en un número discreto de sensores de error, minimizándose el cuadrado de la presión en esas posiciones mediante un sistema comercial que implementa el algoritmo FX-LMS.

[EN] In this work, an Active Noise Control system has been implemented in a slightly damped room harmonically excited. We are interested in the reduction of the sound pressure level over the whole enclosure, global control, so we have to consider the modal overlapping in order to discriminate between diffuse and modal field. The sum of the square pressure levels at the discrete sensor positions has been reduced using the Filtered-X LMS algorithm. Important reductions can be obtained when the secondary sources are far away from the primary source, but the best results are achieved when the secondary sources are closed to the primary one.

Las aplicaciones prácticas de las técnicas CAR en recintos van dirigidas esencialmente al control del ruido de baja frecuencia en las cabinas de los aviones y en el interior de los vehículos, para el control del booming del habitáculo. En estos problemas es imposible aplicar técnicas de control pasivo sin aumentar de forma considerable el peso, y por tanto, el consumo. En ambos casos existen numerosos trabajos realizados con éxito.

9 pp.-- PACS nr.: 43.50.Ki.-- Comunicación presentada en los siguientes congresos: XXX Jornadas Nacionales de Acústica – TecniAcústica 1999. Encuentro Ibérico de Acústica (Ávila, 20-22 Octubre 1999).

Este trabajo ha sido posible gracias al soporte financiero de la Comisión Interministerial de Ciencia y Tecnología (Proyecto AMB97-1175-C03-01).

Publicado en número especial de la Revista de Acústica: Vol 30(1999).

Peer reviewed

Country
Spain
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Keywords

Modal overlapping, Densidad modal, Active Noise Control Systems (ANC)s, Filtered-X LMS algorithm, Sound pressure level, Primary source, Secondary sources, Diffuse field, Control Activo del Ruido (CAR), Energía potencial acústica, Modal field, Algoritmo FX-LMS

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