Radial modes of laterally stiffened piezoelectric disc transducers for ultrasonic collimated beam generation
| Autor: | Dipen N. Sinha, Cristian Pantea, Vamshi Krishna Chillara |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Frequency response
Materials science business.industry Applied Mathematics Acoustics General Physics and Astronomy 02 engineering and technology musculoskeletal system 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Collimated light Stiffening Vibration Computational Mathematics Optics Modeling and Simulation 0103 physical sciences Bessel beam Ultrasonic sensor 0210 nano-technology business 010301 acoustics Beam (structure) |
| Zdroj: | Wave Motion. 76:19-27 |
| ISSN: | 0165-2125 |
| DOI: | 10.1016/j.wavemoti.2017.07.005 |
| Popis: | We numerically investigate the resonance and vibration characteristics of radial modes of laterally stiffened piezoelectric disc transducers. Lateral stiffening is modelled using a spring and vibration characteristics of the piezo-disc are investigated with increasing lateral stiffness. It is found that the resonant frequency response of the radial modes follows an asymptotic behaviour approaching that of a clamped disc with increasing lateral stiffness. The radial mode vibration pattern of the discs is also found to be affected by lateral stiffness. While the vibration pattern of a free disc corresponds to a Bessel function, laterally stiffened discs show edge-effects where they depart from the Bessel-like behaviour. In addition, a fully clamped piezo-disc is found to have an extra side-lobe when compared to a free disc. Ultrasonic beam profiles generated from radial modes of laterally stiffened discs are numerically investigated. It is found that the free piezo-disc generates a Bessel beam that has multiple side-lobes. Increasing the lateral stiffness results in a significant reduction of side-lobes in the beam profile. This technique of generating a collimated beam with side-lobe reduction finds significant applications in imaging through concrete, drilling mud, and other highly attenuating materials. |
| Databáze: | OpenAIRE |
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