Abstract
In this paper, we propose the design of broadband acoustic bends in air. A bending structure composed of perforated panels with various hole-sizes is firstly realized and experimentally demonstrated in a 2D waveguide. However, the perforated plates only tune the refractive index of the unit cell, resulting in impedance mismatch between the structure and the air. Then, we introduce side pipes with various volumes to adjust the impedance of the acoustic bend. Both the simulated and experimental results verify that the acoustic beam can be rotated smoothly through these bends in a wide frequency range. In addition, the transmission intensity is higher than 90% after improving the impedance of the bend. The good performance of these acoustic bends shows their potential applications in many fields, like detection and absorption in pipelines.
Original language | English |
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Publication status | Published - 2018 |
Externally published | Yes |
Event | 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018 - Chicago, United States Duration: Aug 26 2018 → Aug 29 2018 |
Conference
Conference | 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018 |
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Country/Territory | United States |
City | Chicago |
Period | 8/26/18 → 8/29/18 |
Bibliographical note
Publisher Copyright:© INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. All rights reserved.
ASJC Scopus Subject Areas
- Acoustics and Ultrasonics