Using a thin actuator as secondary source for hybrid passive/active absorption in an impedance tube

Cuesta, María; Cobo, Pedro; Fernández, Alejandro; Pfretzschner, Jaime

doi:10.1016/j.apacoust.2005.05.001

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…It is believed that the acoustic community can further adapt these results to its specific theoretical and applied problems, including broadband sound absorption and active noise control. 23,24 …”

Section: ͑22͒mentioning

confidence: 98%

“…The adimensional figures of merit and Ј are useful clues in order to detect which cases can be significantly improved by further design efforts, and which ones cannot. They may also be useful for comparing passive structures and active sound absorbers, 23 as well as for guiding the optimization process of broadband sound absorbers. 24 In the case of very miniature systems, such as silicon-based microelectromechanical system, the requirements of a significant surface mass may be a limitation in order to obtain good matching properties.…”

Section: ͑22͒mentioning

confidence: 99%

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Fundamental constraints on the performance of broadband ultrasonic matching structures and absorbers

Acher

Bernard

Maréchal

et al. 2009

The Journal of the Acoustical Society of America

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Recent fundamental results concerning the ultimate performance of electromagnetic absorbers were adapted and extrapolated to the field of sound waves. It was possible to deduce some appropriate figures of merit indicating whether a particular structure was close to the best possible matching properties. These figures of merit had simple expressions and were easy to compute in practical cases. Numerical examples illustrated that conventional state-of-the-art matching structures had an overall efficiency of approximately 50% of the fundamental limit. However, if the bandwidth at -6 dB was retained as a benchmark, the achieved bandwidth would be, at most, 12% of the fundamental limit associated with the same mass for the matching structure. Consequently, both encouragement for future improvements and accurate estimates of the surface mass required to obtain certain desired broadband properties could be provided. The results presented here can be used to investigate the broadband sound absorption and to benchmark passive and active noise control systems.

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Section: ͑22͒mentioning

confidence: 98%

Section: ͑22͒mentioning

confidence: 99%

Fundamental constraints on the performance of broadband ultrasonic matching structures and absorbers

Acher

Bernard

Maréchal

et al. 2009

The Journal of the Acoustical Society of America

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“…So far, however, most of these efforts resulted in thicker sound absorbers because the panels were arranged in series or because porous absorbers were placed behind the panel [5][6][7][8][9][10][11]. Another idea was to employ active control using a loudspeaker or thin actuator as a secondary source in place of the rigid back wall [12,13]. However, the methods proposed by Cobo et al [12] and Cuesta et al [13] seem to be impractical in real applications.…”

Section: Introductionmentioning

confidence: 99%

“…Another idea was to employ active control using a loudspeaker or thin actuator as a secondary source in place of the rigid back wall [12,13]. However, the methods proposed by Cobo et al [12] and Cuesta et al [13] seem to be impractical in real applications.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of a Multi-Size Microperforated Panel Absorber

Miasa

Okuma

Kishimoto

et al. 2007

JSDD

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A new type of microperforated panel absorber (MPA) that has holes of multiple sizes instead of uniform size is experimentally investigated. The objective of this research is to obtain a wide band sound absorber that is thin, durable, clean, and healthy. The first step of this research is to investigate the performance of MPA having two different sizes and the same numbers of holes. The investigation is then extended to a combination of three and four different sizes of holes with various spatial arrangements and various densities or percentages of each size of holes on panels. The hole diameters vary between 0.4 mm and 1 mm and the cavity depths vary between 10 mm and 15 mm. The results show that a multi-size MPA enhances the absorption rate and widens the effective frequency band. This study also proves that a multi-size MPA when compared with a uniform size MPA has better sound absorption characteristics with respect to the absorber thickness and absorption bandwidth. These results make it possible to build thin, single layer sound absorbers that are effective in wide frequency bands and have the advantage of being tunable.

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“…Seguindo nesta mesma linha de pesquisa, Clark e Fuller (1992) avaliaram experimentalmente a aplicabilidade de atuadores piezelétricos para promover o controle ativo da radiação sonora de uma placa retangular, excitada por um atuador eletrodinâmico.Constataram que a posição dos atuadores piezelétricos na placa foi crítica para obter a resposta estrutural desejada e que o aumento do número de atuadores de controle está diretamente correlacionado com a melhora na atenuação do ruído. O mesmo foi provado porSantana (2002) Cuesta (2006). propôs a utilização de atuadores piezelétricos na criação de um "absorvedor" híbrido (utiliza técnicas de controle de ruído ativas e passivas) em um tubo circular de ondas estacionárias.…”

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Desenvolvimento de um sistema de controle ativo de ruído de baixo custo

Zuffi¹

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Resumo A busca por alternativas que compatibilizem desempenho acústico, térmico e lumínico fez com que a utilização de esquadrias acústicas ventiladas ganhassem destaque. Entretanto as disponíveis no mercado, possuem desempenho limitado em baixas frequências, uma vez que são dotadas apenas de técnicas passivas de controle de ruído, fazendo com que fosse necessário pesquisar novas tecnologias que sejam capazes de eliminar essa deficiência. Dentro deste contexto, o presente trabalho avaliou a implementação de técnicas ativas de controle de ruído em venezianas acústicas utilizando atuadores do tipo piezelétricos. Foram feitas análises numéricas, via método dos elementos finitos, da atenuação de ruído promovida por dois modelos distintos de venezianas. Nestes modelos analisou-se ainda a eficiência do atuador para diferentes posições, visando eleger a configuração posição/modelo capaz de oferecer o melhor incremento na atenuação de ruído. Em seguida, foi realizada uma avaliação experimental para comprovar a aplicabilidade do sistema proposto. Os resultados experimentais obtidos indicaram a capacidade do sistema apresentado de atenuar até 18 dB na saída da veneziana na faixa de frequências analisadas.

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Using a thin actuator as secondary source for hybrid passive/active absorption in an impedance tube

Cited by 7 publications

References 15 publications

Fundamental constraints on the performance of broadband ultrasonic matching structures and absorbers

Fundamental constraints on the performance of broadband ultrasonic matching structures and absorbers

An Experimental Study of a Multi-Size Microperforated Panel Absorber

Desenvolvimento de um sistema de controle ativo de ruído de baixo custo

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