Experimental study on source direction finding using a cylindrical array considering scattered sound fields

2019 ◽  
Vol 146 (4) ◽  
pp. 3059-3059
Author(s):  
Sea-Moon Kim ◽  
Keunhwa Lee ◽  
Yeon-Seong Choo ◽  
Sung-Hoon Byun
Keyword(s):  
Experimental Study ◽  
Direction Finding ◽  
Sound Fields ◽  
Cylindrical Array

Zero Spillover Active Structural Acoustic Control

2004 ◽  
Author(s):  
Moustafa Al-Bassyiouni ◽  
B. Balachandran
Keyword(s):  
Experimental Study ◽  
Three Dimensional ◽  
Frequency Range ◽  
Sound Fields ◽  
Rectangular Enclosure ◽  
Acoustic Control ◽  
Structural Acoustic Control

In this article, a combined analytical and experimental study conducted on the feasibility of implementing a relaxed zero spillover control (RZSC) scheme for active structural acoustic control (ASAC) is presented. The aim of this effort is to actively control sound fields inside a three-dimensional rectangular enclosure into which noise is transmitted through a flexible boundary. Piezoceramic patches, which are mounted on the flexible boundary, are used as actuators, and microphones, which are placed inside and outside the enclosure, are used as sensors. In the experiments, an attenuation of 5.56 dB is obtained for broadband excitation in the frequency range of 20 Hz ≤ f ≤ 220 Hz.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study
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