Simulation of acoustic lens influence on wavefront shaping

• Autorzy: Nowak Tomasz , Dobrucki Andrzej

Identyfikatory

DOI

10.21008/j.0860-6897.2024.1.07

• Języki publikacji: EN

Abstrakty

EN

The main objective of presented study is to examine the influence of an acoustic lens on shape of the wavefront. To conveniently illustrate the difference between acoustic pressure wave propagation with and without the lens, an isodynamic transducer was chosen as a source. This kind of loudspeaker generates flat wavefront as a result of approximately uniform distribution of speed and phase on the entire diaphragm. The designed lens consisted of a matrix of individual waveguides. Manipulation of size and position of output matrix in relation to input matrix allowed for achieving the desired waveguide length distribution. Differences in lengths of lens’s channels resulted in wavefront delay distribution at the output matrix. A numerical model of transducer and waveguide matrix was created to evaluate the behaviour of acoustic pressure wave propagation trough the designed lens. With stationary study, a spatial pressure distribution was calculated, in the near field and far field, in hemisphere in front of the lens as well as in hemisphere in front of just the transducer. The differences in wavefront shapes between the two cases were clearly visible in comparisons, confirming the expected pressure wave delay distribution of the lens. The resulting wavefront curvature was compared to the assumed one in theoretical design. Results of those comparisons proved the possibility of influencing the wavefront shape, by manipulating the output matrix with some caveats discussed in the paper. The data from numerical calculation of pressure propagation allowed for visualizing calculated sound pressure level distribution, adding the directivity evaluation to the comparisons.

Słowa kluczowe

EN

transducers; waveguides; pressure acoustics; numeric methods; simulation

PL

przetworniki; falowody; metody numeryczne; symulacja

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2024
• Tom: Vol. 35, nr 1
• Strony: art. no. 2024107
• Opis fizyczny: Bibliogr. 6 poz., il. kolor., wykr.

Twórcy

autor

Nowak Tomasz

• Department of Acoustics, Multimedia and Signal Processing, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Dobrucki Andrzej

• Department of Acoustics, Multimedia and Signal Processing, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

• https://orcid.org/0000-0002-2588-547X

Bibliografia

• 1. T. Dahl, J. L. Ealo, K. Papakonstantinou, J. F. Pazos; Design of Acoustic Lenses for Ultrasonic Human-Computer Interaction; IEEE International Ultrasonics Symposium, 1 October 2011; DOI:10.1109/ULTSYM.2011.0017
• 2. V. Berstis; 3D printed acoustic lens for dispersing sound; J. Audio Eng. Soc., 2018, 66 (12), 1082-1093
• 3. T. Nowak, A. Dobrucki; Koncepcja matrycy falowodowej do kształtowania frontu fali akustycznej (in Polish:); XIX Międzynarodowe Sympozjum Nowości w Technice Audio i Wideo NTAV2022, Wrocław, Poland, 13-15.10.2022; InfoArt, 2022, 18-19
• 4. Z. Żyszkowski; Podstawy elektroakustyki (in Polish); WNT, 1984
• 5. A. Dobrucki; Przetworniki elektroakustyczne (in Polish); WNT; 2007
• 6. COMSOL documentation website; URL: https://doc.comsol.com/5.5/doc/com.comsol.help.aco/aco_ug_pressure.05.002.html (accessed on 2023.07.10)

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).