Abnormal interference of very low frequency sound field in shallow water

2021 ◽  
Vol 150 (4) ◽  
pp. A317-A317
Author(s):  
Shengchun Piao ◽  
Yang Dong ◽  
Zhiqiang Wu
Keyword(s):  
Shallow Water ◽  
Low Frequency ◽  
Sound Field ◽  
Very Low Frequency ◽  
Frequency Sound

Low-frequency sound field focusing in shallow water.

2009 ◽  
Vol 126 (4) ◽  
pp. 2305
Author(s):  
Valeriy G. Petnikov ◽  
Andrey A. Lunkov ◽  
Alexander A. Stromkov
Keyword(s):  
Shallow Water ◽  
Low Frequency ◽  
Sound Field ◽  
Frequency Sound

Influence of seabed on very low frequency sound recorded during passage of merchant ships on the New England shelf

2021 ◽  
Vol 149 (5) ◽  
pp. 3294-3300
Author(s):  
D. P. Knobles ◽  
Preston S. Wilson ◽  
Tracianne B. Neilsen ◽  
William S. Hodgkiss
Keyword(s):  
New England ◽  
Low Frequency ◽  
Very Low Frequency ◽  
Frequency Sound

Low Frequency Sound as a Navigational Tool for People with Visual Impairments

2002 ◽  
Vol 21 (4) ◽  
pp. 199-205 ◽  
Author(s):  
Daniel Ashmead ◽  
Robert Wall
Keyword(s):  
Wall Motion ◽  
Visual Impairments ◽  
Low Frequency ◽  
Sound Field ◽  
Frequency Sound ◽  
Acoustic Information ◽  
Large Structures ◽  
Dominant Feature ◽  
Mistaken Assumption ◽  
Navigational Tool

For decades, a mistaken assumption in the habilitation of travel for people with visual impairments has been that the use of “echolocation” is a dominant feature of acoustic information for the guidance of locomotion. This paper outlines a theoretical model of acoustic information available in many travel situations. The acoustic information consists of a build up of low frequency sound along large structures such as walls. Useful frequencies are low enough that the experience of this build up is often one of feeling rather than hearing. Experimental validation of this model was accomplished by having participants with visual impairments walk along walls with varying types of auditory occlusion and through laboratory based manipulations of acoustic information. Results indicate that the model is appropriate. Useful acoustic information appears to extend up to 1 m from a wall. There is strong evidence that participants make use of binaural information, gauging the similarity of acoustic information reaching each ear to maintain orientation to a wall. Motion through the sound field near the wall makes the information more useful but it is unclear whether motion in certain directions or conditions is more useful than others.

A simple acoustic model to characterize the internal low frequency sound field in centrifugal pumps

2011 ◽  
Vol 72 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Jorge Parrondo ◽  
Javier Pérez ◽  
Raúl Barrio ◽  
José González
Keyword(s):  
Low Frequency ◽  
Sound Field ◽  
Acoustic Model ◽  
Centrifugal Pumps ◽  
Frequency Sound

The coherence of low-frequency sound in shallow water in the presence of internal waves

2014 ◽  
Vol 60 (1) ◽  
pp. 61-71 ◽  
Author(s):  
A. A. Lunkov ◽  
V. G. Petnikov
Keyword(s):  
Shallow Water ◽  
Internal Waves ◽  
Low Frequency ◽  
Frequency Sound

Low-frequency sound field in a room with a Helmholtz resonator

2000 ◽  
Vol 46 (4) ◽  
pp. 491-493 ◽  
Author(s):  
A. D. Lapin
Keyword(s):  
Low Frequency ◽  
Sound Field ◽  
Helmholtz Resonator ◽  
Frequency Sound
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