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

Leigh-Ann Orr, Anthony J. Mulholland, Richard L. O'Leary, Gordon Hayward

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 reduceill-conditioning in the large matrices which can arise. The identication of the modes of vibration is aided by examining proles of the displacements, electrical potentialand Poynting vector. The dispersive behaviour of a 2-2 composite transducer with high shear attenuation in the passive phase is examined. The model shows thatthe use of a high shear attenuation ller material improves the frequency band gap surrounding the fundamental thickness mode.
LanguageEnglish
Pages652-663
Number of pages12
JournalUltrasonics
Volume48
Issue number8
DOIs
Publication statusPublished - 31 Dec 2008

Fingerprint

harmonic analysis
transducers
plane waves
expansion
composite materials
vibration mode
attenuation
shear
conditioning
pistons
ultrasonics
scaling
matrices

Keywords

  • composites
  • ultrasonic transducer
  • plane wave expansion
  • viscoelastic loss

Cite this

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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 reduceill-conditioning in the large matrices which can arise. The identication of the modes of vibration is aided by examining proles of the displacements, electrical potentialand Poynting vector. The dispersive behaviour of a 2-2 composite transducer with high shear attenuation in the passive phase is examined. The model shows thatthe use of a high shear attenuation ller material improves the frequency band gap surrounding the fundamental thickness mode.",
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Harmonic analysis of lossy piezoelectric composite transducers using the plane wave expansion method. / Orr, Leigh-Ann; Mulholland, Anthony J.; O'Leary, Richard L.; Hayward, Gordon.

In: Ultrasonics, Vol. 48, No. 8, 31.12.2008, p. 652-663.

Research output: Contribution to journalArticle

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AU - Hayward, Gordon

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