Abstract
As a sound transmitting device based on the nonlinear acoustic theory, parametric acoustic array (PAA) can generate low-frequency spatially focused sound beams in wide frequency band using small aperture transducers. Because of this feature, for more than half a century, PAAs have been raising interest in their study and application in various fields both in the air and underwater. In this research, an interaction of the sound field generated by the PAA with a low-frequency external sound source is studied numerically and experimentally. The experimental setup consisted of a hexagonal array of 48 ultrasonic transducers, a low-frequency speaker, and a single channel microphone. Both simple amplitude-modulated tone signals and signals of a more complex form and modulation were used. The real-time modulation was done through a fast digital processor. The simulations were done via k-Wave acoustic toolbox considering nonlinearities and power law absorption. The results of experiments and simulations are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 437-442 |
| Number of pages | 6 |
| Journal | Underwater Acoustic Conference and Exhibition Series |
| State | Published - 2023 |
| Externally published | Yes |
| Event | 7th Underwater Acoustics Conference and Exhibition, UACE 2023 - Kalamata, Greece Duration: 25 Jun 2023 → 30 Jun 2023 |
Bibliographical note
Publisher Copyright:© 2023, International Association for Hydro-Environment Engineering and Research. All rights reserved.
Keywords
- active noise control
- interference
- nonlinear acoustics
- parametric acoustic array
ASJC Scopus subject areas
- Geophysics
- Oceanography
- Environmental Engineering
- Acoustics and Ultrasonics