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Numerical and theoretical analysis of sound absorption by an actively controlled electrodynamic loudspeaker

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Abstract

This work addresses the dynamic modeling and simulation of electrodynamic loudspeakers as active acoustic absorbers. A dynamic system is formulated based on the coupling of acoustic and electromechanical phenomena to describe the behavior of a loudspeaker placed at the end of a straight duct. Next, a proportional-plus-derivative feedback control system combined with a feedforward structure is developed to allow the loudspeaker to perform active impedance control. In contrast to previous works, the proposed control strategy relies on measurements of the electric current rather than of the diaphragm velocity. Computational simulations show that the control system is stable, reliable and efficient in increasing the acoustic absorption in a large frequency range, even though some limitations due to the loudspeaker operation may exist.

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Acknowledgments

This research was supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG, Brazil; Project APQ-02293-13) and by a scholarship to the first author granted by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ, Brazil).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, 31270901, Brazil

    Mateus de Freitas Virgilio Pereira, Alexander Mattioli Pasqual & Guilherme de Souza Papini

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  1. Mateus de Freitas Virgilio Pereira
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  2. Alexander Mattioli Pasqual
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  3. Guilherme de Souza Papini
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Correspondence to Mateus de Freitas Virgilio Pereira.

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Technical Editor: Antonio Ferreira Avila.

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Pereira, M.d.F.V., Pasqual, A.M. & Papini, G.d.S. Numerical and theoretical analysis of sound absorption by an actively controlled electrodynamic loudspeaker. J Braz. Soc. Mech. Sci. Eng. 39, 81–87 (2017). https://doi.org/10.1007/s40430-016-0526-6

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  • DOI: https://doi.org/10.1007/s40430-016-0526-6

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