A new method of estimating acoustic intensity applied to the sound field near a military jet aircraft

2014 ◽  
Vol 136 (4) ◽  
pp. 2081-2081
Author(s):  
Trevor A. Stout ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Derek C. Thomas ◽  
Benjamin Y. Christensen ◽  
...  
Keyword(s):  
Sound Field ◽  
New Method ◽  
Acoustic Intensity

scholarly journals A Prediction Method for Acoustic Intensity Vector Field of Elastic Structure in Shallow Water Waveguide

2020 ◽  
Vol 2020 ◽  
pp. 1-23
Author(s):  
Wenbo Wang ◽  
Desen Yang ◽  
Jie Shi
Keyword(s):  
Spatial Structure ◽  
Shallow Water ◽  
Transfer Functions ◽  
Source Parameters ◽  
Prediction Method ◽  
Sound Field ◽  
Elastic Structure ◽  
Superposition Method ◽  
Acoustic Intensity ◽  
Sound Energy

Compared with scalar sound field, vector sound field explained the spatial structure of sound field better since it not only presents the sound energy distribution but also describes the sound energy flow characteristics. Particularly, with more complicated interaction among different wavefronts, the vector sound field characteristics of an elastic structure in a shallow water waveguide are worthy of studying. However, there is no reliable prediction method for the vector sound field of an elastic structure with a high efficiency in a shallow water waveguide. To solve the problem, transfer functions in the waveguide have been modified with some approximations to apply for the vector sound field prediction of elastic structures in shallow water waveguides. The method is based on the combined wave superposition method (CWSM), which has been proved to be efficient for predicting scalar sound field. The rationality of the approximations is validated with simulations. Characteristics of the complex acoustic intensity, especially the vertical components are observed. The results show that, with constructive and destructive interferences in the depth direction, there could be quantities of crests and vortices in the spatial structure of time-dependent complex intensity, which manifest a unique dynamic characteristic of sound energy. With more complicated interactions among the wavefronts, a structure source could not be equivalent to a point source in most instances. The vector sound field characteristics of the two sources could be entirely different, even though the scalar sound field characteristics are similar. Meanwhile, source types, source parameters, ocean environment parameters, and geo parameters may have influence on the vector sound field characteristics, which could be explained with the normal mode theory.

Investigating measurement of acoustic intensity for rocket sound field characterization

2012 ◽  
Vol 132 (3) ◽  
pp. 1985-1985
Author(s):  
Kent L. Gee ◽  
Jonathan D. Blotter ◽  
Scott D. Sommerfeldt ◽  
Derek C. Thomas ◽  
Kenneth S. Bostwick ◽  
...  
Keyword(s):  
Sound Field ◽  
Acoustic Intensity

New method for sound field reproduction

1989 ◽  
Vol 35 (4) ◽  
pp. 775-784 ◽  
Author(s):  
M. Takemoto ◽  
S. Yakko ◽  
N. Kuroda ◽  
S. Sano ◽  
T. Miyachi ◽  
...  
Keyword(s):  
Sound Field ◽  
New Method

Measurement of acoustic intensity in reactive sound field

1975 ◽  
Vol 57 (6) ◽  
pp. 1263-1268 ◽  
Author(s):  
Theodore J. Schultz ◽  
P. W. Smith ◽  
C. I. Malme
Keyword(s):  
Sound Field ◽  
Acoustic Intensity

A Tangibly Reinforced Speech Reception Threshold Procedure for Use with Small Children

1976 ◽  
Vol 41 (3) ◽  
pp. 333-338
Author(s):  
Frederick N. Martin ◽  
Sherry Coombes
Keyword(s):  
Operant Conditioning ◽  
Sound Field ◽  
Normal Hearing ◽  
New Method ◽  
Small Children ◽  
Field System ◽  
Speech Reception ◽  
Threshold Procedure ◽  
Speech Reception Thresholds ◽  
Hearing Children

Forty normal-hearing children between 17 and 56 months were tested using a new method for determining speech reception thresholds. The words employed were names for parts of a device that was in the form of a colorful clown. The device automatically rewarded the child with a small piece of candy each time he pressed the part of the clown that had been announced through the sound field system of a speech audiometer. Results showed that operant conditioning speech audiometry using tangible reinforcers is feasible for small children. Both boys and girls can be tested accurately by this method down to age two and one-half years.

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