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Now showing items 1 - 4 of 4

  • Development and Characterization of a Piezoelectrically Actuated MEMS Digital Loudspeaker

    Dejaeger, R.   Casset, F.   Desloges, B.   Le Rhun, G.   Robert, P.   Fanget, S.   Leclere, Q.   Ege, K.   Guyader, J-L  

    The MEMS digital loudspeaker consists of a set of acoustic transducers, called speaklets, arranged in a matrix and which operate in a binary manner by emitting short pulses of sound pressure. Using the principle of additivity of pressures in the air, it is possible to reconstruct an audible sound. MEMS technology is particularly well suited to produce the large number of speaklets needed for sound reconstruction quality while maintaining a reasonable size. This paper presents for the first time the modeling, realization and characterizations of a piezoelectric digital loudspeaker based on MEMS technology. Static, dynamic and acoustic measurements are performed and match closely with theoretical results. (C) 2012 Elsevier Ltd....Selection and/or peer-review under responsibility of the Symposium Cracoviense Sp. z.o.o.
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  • Characterization of surface impedance of vibro-acoustic subdomains with experimental measurements

    Grialou, M.   Totaro, N.   Guyader, J-L   Bocquillet, A.  

    In substructuring approaches in the field of acoustics, subdomains are mostly characterized by impedance or mobility at their interfaces with other subdomains. This allows handling large systems broken down into smaller, easier to solve subdomains and reaching higher frequency ranges. When a subdomain is characterized by experiments, the impedances are often measured on a dedicated setup aimed at uncoupling the subdomain from the other subdomains. This is often hardly feasible and the setup is insufficiently versatile. In the present article, an inverse method is proposed to experimentally identify the surface impedance of a passive acoustic (or vibro-acoustic) subdomain by means of measurements performed on the whole coupled system. An analytical study illustrates the ability of the approach to identify the impedance matrix of a passive subdomain with accuracy. Nevertheless, as many inverse methods, the system of equations to solve is ill-conditioned. To address this issue, an original approach for tackling the ill-posedness of the problem is proposed. It is based on a statistical analysis of different versions of the matrix to identify. Finally, an experimental validation of the proposed approach is detailed and shows a good agreement when comparing to an available analytical solution. (C) 2019 Elsevier Ltd. All rights reserved.
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  • J.-L. Guyader, ,Vibration in Continuous Media (2006) ISTE Ltd.,London and New York 1-905209-27-4 441pp., €165, US$210, £105.

    D.J. Gorman  

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  • J.-L. Guyader, ,Vibration in Continuous Media (2006) ISTE Ltd.,London and New York 1-905209-27-4 441pp., €165, US$210, £105.

    D.J. Gorman  

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