Evaluation method of sound field diffusion using sound intensity measurements

2012 ◽  
Vol 131 (4) ◽  
pp. 3284-3284
Author(s):  
Kohta Sugiura ◽  
Akira Omoto
Keyword(s):  
Evaluation Method ◽  
Sound Field ◽  
Sound Intensity ◽  
Intensity Measurements ◽  
Field Diffusion

scholarly journals 3D Acoustic Field Intensity Probe Design and Measurements

2016 ◽  
Vol 41 (4) ◽  
pp. 701-711 ◽  
Author(s):  
Józef Kotus ◽  
Andrzej Czyżewski ◽  
Bożena Kostek
Keyword(s):  
Acoustic Field ◽  
Field Intensity ◽  
Research Study ◽  
Sound Field ◽  
Sound Intensity ◽  
Calibration Procedure ◽  
Measurement Procedure ◽  
Probe Design ◽  
Intensity Measurements ◽  
Probe Measurements

Abstract The aim of this paper is two-fold. First, some basic notions on acoustic field intensity and its measurement are shortly recalled. Then, the equipment and the measurement procedure used in the sound intensity in the performed research study are described. The second goal is to present details of the design of the engineered 3D intensity probe, as well as the algorithms developed and applied for that purpose. Results of the intensity probe measurements along with the calibration procedure are then contained and discussed. Comparison between the engineered and the reference commercial probe confirms that the designed construction is applicable to the sound field intensity measurements with a sufficient effectiveness.

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

Investigation of wind and sound field characteristics of multi-rotor unmanned aerial vehicle

2020 ◽  
Vol 51 (7-9) ◽  
pp. 158-163
Author(s):  
Huiru Cao ◽  
Haixiu Cheng ◽  
Wenjian Zhu
Keyword(s):  
Linear Relationship ◽  
Unmanned Aerial Vehicle ◽  
Wind Field ◽  
Sound Field ◽  
Sound Intensity ◽  
Experimental Platform ◽  
Distance Range ◽  
Aerial Vehicle ◽  
Set Up ◽  
Wind Intensity

Wind field and sound field characteristics are the key indexes for unmanned aerial vehicle. Therefore, in this study, the wind field and sound field characteristics of a quad-rotor unmanned aerial vehicle are investigated. First, the experimental platform was set up based on quad-rotor unmanned aerial vehicle. Second, the experiments were performed on the wind field and the sound field characteristics of the unmanned aerial vehicle at different working currents. Then, the experiment results were analysed. Meanwhile, the experimental results showed that the working current has a large impact on the wind field and the wind intensity increases as working current increases; as the working current increases, the sound field is enhanced and a linear relationship exists; within a certain distance range of the unmanned aerial vehicle, as distance increases, sound intensity dramatically decreases. The presented methods and results can not only be used to evaluate the performance of the electric multi-rotor unmanned aerial vehicle but also provide references for the further improvement of the performance of the unmanned aerial vehicle.

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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