Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7152015 | Applied Acoustics | 2018 | 11 Pages |
Abstract
Parametric array (PA) sources generate a directional sound beam, via the PA phenomenon. Practical PA sources, such as PA loudspeakers, have high power consumption, low sound quality, and high cost. The stepped-plate transducer, which consists of a Langevin transducer, a horn, and a radiating plate with steps, can provide high-intensity sound and a highly directional sound beam in the acoustic axis. This study investigated the use of a stepped-plate transducer to make a PA source with high directivity and a wide bandwidth. A stepped-plate transducer that had two different resonance frequencies (f1â¯=â¯77.5â¯kHz, f2â¯=â¯87.4â¯kHz) was designed for wide bandwidth, and the three different heights of the steps on the plate (ts1â¯=â¯2.28â¯mm, ts2â¯=â¯2.14â¯mm, ts3â¯=â¯2.02â¯mm) were intended to provide high directivity sound beams. The fabricated stepped-plate transducer demonstrated a 50â¯Â±â¯3â¯dB sound pressure level for the difference frequency wave in the 4-19â¯kHz frequency range (with equalization), and 4.2-5.1° of HPBW was shown for the highly directional sound beam.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Yonghwan Hwang, Wonkyu Moon,