A finite element approach to modelling fractal ultrasonic transducers

Ebrahem A. Algehyne, Anthony J. Mulholland

Research output: Contribution to journalArticle

7 Citations (Scopus)
100 Downloads (Pure)

Abstract

Piezoelectric ultrasonic transducers usually employ composite structures to improve their transmission and reception sensitivities. The geometry of the composite is regular with one dominant length scale and, since these are resonant devices, this dictates the central operating frequency of the device. In order to construct a wide bandwidth device it would seem natural therefore to utilize resonators that span a range of length scales. In this article we derive a mathematical model to predict the dynamics of a fractal ultrasound transducer; the fractal in this case being the Sierpinski gasket. Expressions for the electrical and mechanical fields that are contained within this structure are expressed in terms of a finite element basis. The propagation of an ultrasonic wave in this transducer is then analyzed and used to derive expressions for the non-dimensionalised electrical impedance and the transmission and reception sensitivities as a function of the driving frequency. Comparing these key performance measures to an equivalent standard (Euclidean) design shows some benefits of these fractal designs.
Original languageEnglish
Pages (from-to)1684-1702
Number of pages19
JournalIMA Journal of Applied Mathematics
Volume80
Issue number6
Early online date29 May 2015
DOIs
Publication statusPublished - 1 Dec 2015

Keywords

  • finite element method
  • renormalisation
  • transducer
  • ultrasound
  • fractal

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