Numerical optimisation of piezocomposite material properties using 3D finite - element modeling

Jerzy Dziewierz, Anthony Gachagan, Richard O'Leary, Sivaram Nishal Ramadas

Research output: Contribution to conferencePaper

Abstract

1-3 connectivity piezoelectric ceramic composite materials are commonly used as the active layer of ultrasonic transducer arrays in many applications. In a typical design, the designer has a freedom to choose between various piezoceramic crystals and polymer fillers that constitute the piezocomposite structure. However, there are many design constraints to be met, including the requirements for uni-modality and low lateral coupling of this periodic material configuration. Additionally, recent developments in material science opened the possibility to adjust the polymer composition, and therefore its parameters, in a continuous
manner. Given such a complex design problem, it is convenient to use numerical
optimisation to meet the design constraints while maximizing performance. However, classic 1D transducer models, while quick to compute and suitable for optimisation, become inaccurate with these new polymer materials, as they require the use of simplifying assumptions.
In this work, a comprehensive time-domain 3D Finite-Element Model is presented which was designed for efficient computation, making it suitable for use with numerical optimisation. The model takes into account numerous phenomena that could not be modelled in 1D, such as non-uniform surface vibration, and inter-element crosstalk. Additionally, it permits optimisation of the filler polymer composition to maximize performance for the desired application. Results of the optimiser for an example 2.5MHz array design problem are presented and discussed.
LanguageEnglish
Number of pages8
Publication statusPublished - Jul 2009
Event16th International Congress on Sound and Vibration (CSV16) - Krakow, Poland
Duration: 5 Jul 20099 Jul 2009

Conference

Conference16th International Congress on Sound and Vibration (CSV16)
CountryPoland
CityKrakow
Period5/07/099/07/09

Fingerprint

Materials properties
Polymers
Fillers
Ultrasonic transducers
Piezoelectric ceramics
Materials science
Ceramic materials
Crosstalk
Chemical analysis
Transducers
Crystals
Composite materials

Keywords

  • numerical optimisation
  • piezocomposite material properties
  • 3D
  • finite element modelling

Cite this

Dziewierz, J., Gachagan, A., O'Leary, R., & Ramadas, S. N. (2009). Numerical optimisation of piezocomposite material properties using 3D finite - element modeling. Paper presented at 16th International Congress on Sound and Vibration (CSV16), Krakow, Poland.
Dziewierz, Jerzy ; Gachagan, Anthony ; O'Leary, Richard ; Ramadas, Sivaram Nishal. / Numerical optimisation of piezocomposite material properties using 3D finite - element modeling. Paper presented at 16th International Congress on Sound and Vibration (CSV16), Krakow, Poland.8 p.
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Dziewierz, J, Gachagan, A, O'Leary, R & Ramadas, SN 2009, 'Numerical optimisation of piezocomposite material properties using 3D finite - element modeling' Paper presented at 16th International Congress on Sound and Vibration (CSV16), Krakow, Poland, 5/07/09 - 9/07/09, .

Numerical optimisation of piezocomposite material properties using 3D finite - element modeling. / Dziewierz, Jerzy; Gachagan, Anthony; O'Leary, Richard; Ramadas, Sivaram Nishal.

2009. Paper presented at 16th International Congress on Sound and Vibration (CSV16), Krakow, Poland.

Research output: Contribution to conferencePaper

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T1 - Numerical optimisation of piezocomposite material properties using 3D finite - element modeling

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AU - Gachagan, Anthony

AU - O'Leary, Richard

AU - Ramadas, Sivaram Nishal

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N2 - 1-3 connectivity piezoelectric ceramic composite materials are commonly used as the active layer of ultrasonic transducer arrays in many applications. In a typical design, the designer has a freedom to choose between various piezoceramic crystals and polymer fillers that constitute the piezocomposite structure. However, there are many design constraints to be met, including the requirements for uni-modality and low lateral coupling of this periodic material configuration. Additionally, recent developments in material science opened the possibility to adjust the polymer composition, and therefore its parameters, in a continuous manner. Given such a complex design problem, it is convenient to use numerical optimisation to meet the design constraints while maximizing performance. However, classic 1D transducer models, while quick to compute and suitable for optimisation, become inaccurate with these new polymer materials, as they require the use of simplifying assumptions. In this work, a comprehensive time-domain 3D Finite-Element Model is presented which was designed for efficient computation, making it suitable for use with numerical optimisation. The model takes into account numerous phenomena that could not be modelled in 1D, such as non-uniform surface vibration, and inter-element crosstalk. Additionally, it permits optimisation of the filler polymer composition to maximize performance for the desired application. Results of the optimiser for an example 2.5MHz array design problem are presented and discussed.

AB - 1-3 connectivity piezoelectric ceramic composite materials are commonly used as the active layer of ultrasonic transducer arrays in many applications. In a typical design, the designer has a freedom to choose between various piezoceramic crystals and polymer fillers that constitute the piezocomposite structure. However, there are many design constraints to be met, including the requirements for uni-modality and low lateral coupling of this periodic material configuration. Additionally, recent developments in material science opened the possibility to adjust the polymer composition, and therefore its parameters, in a continuous manner. Given such a complex design problem, it is convenient to use numerical optimisation to meet the design constraints while maximizing performance. However, classic 1D transducer models, while quick to compute and suitable for optimisation, become inaccurate with these new polymer materials, as they require the use of simplifying assumptions. In this work, a comprehensive time-domain 3D Finite-Element Model is presented which was designed for efficient computation, making it suitable for use with numerical optimisation. The model takes into account numerous phenomena that could not be modelled in 1D, such as non-uniform surface vibration, and inter-element crosstalk. Additionally, it permits optimisation of the filler polymer composition to maximize performance for the desired application. Results of the optimiser for an example 2.5MHz array design problem are presented and discussed.

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KW - piezocomposite material properties

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Dziewierz J, Gachagan A, O'Leary R, Ramadas SN. Numerical optimisation of piezocomposite material properties using 3D finite - element modeling. 2009. Paper presented at 16th International Congress on Sound and Vibration (CSV16), Krakow, Poland.