Modeling of functionally graded piezoelectric ultrasonic transducers

Rubio, Wilfredo Montealegre; Buiochi, Flávio; Adamowski, Júlio C.; Silva, Emilío Carlos Nelli

doi:10.1016/j.ultras.2009.01.001

Cited by 23 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this Section, numerical results for all cylinders under consideration will be presented and discussed. These waveguides are composed of a PZT-5A material whose properties are given in [2,44,47]. In order to obtain the real and imaginary branches of dispersion curves, the fast and "smart" bisection method was used, which decreases the interval and increases the precision when the roots are very close to each other, and hence, it does not miss them.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Controlling the dynamic behavior of piezoceramic cylinders by cross-section geometry

2012

View full text Add to dashboard Cite

This paper focuses on the possibilities of controlling the dispersion spectra and wave characteristics of cylindrical waveguides by changing their geometry and electro-elastic properties. We consider cylinders with classical circular and hollow cross-sections, and waveguides that have sector cut of arbitrary angular measure in the cross-section. Numerical results are presented for the cylinders of all studied types with different boundary conditions. It is shown that the required wave characteristics can be obtained by a variation of the cross-section geometry of the waveguides.

show abstract

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The dynamic behavior of piezoelectric cylinders has been studied from different points of view [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. A modern historical outline of the development of these problems and their applications in electro-mechanical devices can be found in [46,48].…”

Section: Introductionmentioning

confidence: 99%

Controlling the dynamic behavior of piezoceramic cylinders by cross-section geometry

2012

View full text Add to dashboard Cite

show abstract

“…Mechanical properties of the matching, backing, and lens layers are given in Table 3. All material properties were taken following previous investigations reported in [37].…”

Section: Materials Propertiesmentioning

confidence: 99%

Modelling and Numerical Simulations of In-Air Reverberation Images for Fault Detection in Medical Ultrasonic Transducers: A Feasibility Study

et al. 2015

View full text Add to dashboard Cite

A simplified two-dimensional finite element model which simulates the in-air reverberation image produced by medical ultrasonic transducers has been developed. The model simulates a linear array consisting of 128 PZT-5A crystals, a tungsten-epoxy backing layer, an Araldite matching layer, and a Perspex lens layer. The thickness of the crystal layer is chosen to simulate pulses centered at 4 MHz. The model is used to investigate whether changes in the electromechanical properties of the individual transducer layers (backing layer, crystal layer, matching layer, and lens layer) have an effect on the simulated in-air reverberation image generated. Changes in the electromechanical properties are designed to simulate typical medical transducer faults such as crystal drop-out, lens delamination, and deterioration in piezoelectric efficiency. The simulations demonstrate that fault-related changes in transducer behaviour can be observed in the simulated in-air reverberation image pattern. This exploratory approach may help to provide insight into deterioration in transducer performance and help with early detection of faults.

show abstract

“…Once the geometry was discretized, material properties were selected, and excitation was defined, the solution was obtained for nodes of the elements. The required solutions for arbitrary positions were obtained using a linear combination of polynomial interpolation functions, as described in [33][34][35][36]. The entire analysis was performed in the time domain using a step-by-step time explicit integration scheme to obtain displacements.…”

Section: Ceramic Modelling-ultrasonic Wave Generationmentioning

confidence: 99%

Local Interaction Simulation Approach for Fault Detection in Medical Ultrasonic Transducers

et al. 2015

View full text Add to dashboard Cite

A new approach is proposed for modelling medical ultrasonic transducers operating in air. The method is based on finite elements and the local interaction simulation approach. The latter leads to significant reductions of computational costs. Transmission and reception properties of the transducer are analysed using in-air reverberation patterns. The proposed approach can help to provide earlier detection of transducer faults and their identification, reducing the risk of misdiagnosis due to poor image quality.

show abstract

Modeling of functionally graded piezoelectric ultrasonic transducers

Cited by 23 publications

References 14 publications

Controlling the dynamic behavior of piezoceramic cylinders by cross-section geometry

Controlling the dynamic behavior of piezoceramic cylinders by cross-section geometry

Modelling and Numerical Simulations of In-Air Reverberation Images for Fault Detection in Medical Ultrasonic Transducers: A Feasibility Study

Local Interaction Simulation Approach for Fault Detection in Medical Ultrasonic Transducers

Contact Info

Product

Resources

About