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Harmonic analysis of lossy piezoelectric composite transducers using the plane wave expansion method

Orr, L. and Mulholland, A.J. and O'Leary, R.L. and Hayward, G. (2008) Harmonic analysis of lossy piezoelectric composite transducers using the plane wave expansion method. Ultrasonics, 48 (8). pp. 652-663. ISSN 0041-624X

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    Abstract

    Periodic composite ultrasonic transducers oer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three dimensional plane wave expansion model (PWE) of these transducers. A comparison with experimental and nite element data is conducted and a design to damp out these lateral modes is investigated. Scaling and regularisation techniques are introduced to the PWE method to reduce ill-conditioning in the large matrices which can arise. The identication of the modes of vibration is aided by examining proles of the displacements, electrical potential and Poynting vector. The dispersive behaviour of a 2-2 composite transducer with high shear attenuation in the passive phase is examined. The model shows that the use of a high shear attenuation ller material improves the frequency band gap surrounding the fundamental thickness mode.

    Item type: Article
    ID code: 13688
    Keywords: composites, ultrasonic transducer, plane wave expansion, viscoelastic loss, Mathematics, Acoustics and Ultrasonics
    Subjects: Science > Mathematics
    Department: Faculty of Science > Mathematics and Statistics
    Unknown Department
    Faculty of Engineering > Electronic and Electrical Engineering
    Related URLs:
      Depositing user: Mrs Mary McAuley
      Date Deposited: 21 Dec 2009 12:57
      Last modified: 05 Sep 2014 01:10
      URI: http://strathprints.strath.ac.uk/id/eprint/13688

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