Complex technique of sound intensity measurements and properties of the basic sound fields

2012 ◽  
Vol 132 (3) ◽  
pp. 1984-1984
Author(s):  
Jiri Tichy ◽  
Gary W. Elko
Keyword(s):  
Sound Intensity ◽  
Sound Fields ◽  
Intensity Measurements

The Use of Acoustic Vectors Decomposition of Sound Fields to Vibroacoustic Protection on Ships

2017 ◽  
Vol 42 (2) ◽  
pp. 207-212
Author(s):  
Stefan Weyna
Keyword(s):  
Transmission Loss ◽  
Measurement Techniques ◽  
Sound Intensity ◽  
Acoustic Energy ◽  
Graphical Form ◽  
Wave Flow ◽  
Noise Abatement ◽  
Sound Fields ◽  
Intensity Measurements ◽  
Flow Map

Abstract In this paper, numerous examples will be illustrated as principles of applying the sound intensity measurements to practical problems at the noise abatement on ships and offshore constructions. The paper presents the results of transmission loss measurements together with flanking transmission for ship bulkheads and partitions with doors and windows. Investigations carried out with sound intensity measurement techniques will be compared against those made by classical methods. Finally for a few examples, the graphic presentation of spatial distribution of sound intensity vectors risen close to vibrating ship cabin partitions and inside the cabin will be shown in 2D and 3D graphical form. As a result, a two-dimensional acoustic wave flow map of time-averaged active intensity vectors propagated along curved streamlines and a vector perpendicular to measured plane are graphically illustrated. The technique of acoustic vectors decomposition of sound fields described, can enrich the knowledge of the mechanism of acoustic energy flux through ship partitions.

Schlieren optical filtering for sound‐intensity measurements

1980 ◽  
Vol 67 (6) ◽  
pp. 2106-2107
Author(s):  
L. Carpenedo ◽  
P. Ciuti ◽  
G. Iernetti
Keyword(s):  
Sound Intensity ◽  
Optical Filtering ◽  
Intensity Measurements

New Toothed Belt Matches Various Pulley-Profiles

2000 ◽  
Author(s):  
Frank H. Schaefer
Keyword(s):  
Sound Intensity ◽  
Belt Drive ◽  
Special Test ◽  
Intensity Measurements ◽  
Test Conditions ◽  
Toothed Belt ◽  
Quality Of Motion ◽  
Center Distance ◽  
Dynamometer Test

Abstract This paper examines the possibility of a new toothed belt construction to run in various pulley-types. The measurements from a laboratory dynamometer test stand show the belt life under special test conditions by use of HTD-, STPD- and RPP-pulleys, each with an angle of wrap of 180°. In case of locked center distance the increase of torque causes tooth climbing until belt jumping occurs. The pretension was brought into line with the torque each time the torque was increased and the jumping limit torque was determined. From literature it is expected that the results for the behavior of the HTD- and the RPP-pulley are similar. Another parameter to describe the quality of motion is the noise. Here sound power is a very effective descriptor of how noisy an object is. It was determined from sound intensity measurements for HTD- and STPD-pulleys. The ratio of the toothed belt drive used for the noise measurement was 0.63.

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