A MINIATURE CONDENSER TRANSMITTER FOR SOUND‐FIELD MEASUREMENTS

1932 ◽  
Vol 4 (1A) ◽  
pp. 83-93 ◽  
Author(s):  
William M. Hall
Keyword(s):  
Sound Field ◽  
Field Measurements

scholarly journals Spiral Sound Wave Transducer Based on the Longitudinal Vibration

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3674 ◽  
Author(s):  
Wei Lu ◽  
Yu Lan ◽  
Rongzhen Guo ◽  
Qicheng Zhang ◽  
Shichang Li ◽  
...  
Keyword(s):  
Sound Wave ◽  
Longitudinal Vibration ◽  
Three Dimensional ◽  
Low Frequency ◽  
Sound Field ◽  
Field Measurements ◽  
Sound Waves ◽  
Underwater Sound ◽  
Three Dimensional Finite Element ◽  
Wave Transducer

A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite element modeling (FEM)of the transducer was established for simulating the vibration modes and the acoustic characteristics of the transducers. Further, we fabricated a spiral sound wave transducer based on our design and simulations. It was found that the resonance frequency of the transducer was 10.8 kHz and that the transmitting voltage resonance was 140.5 dB. The underwater sound field measurements demonstrate that our designed transducer based on the longitudinal elements could successfully generate spiral sound waves.

scholarly journals Nozzles, turbulence, and jet noise prediction

2018 ◽  
Vol 860 ◽  
pp. 1-4 ◽  
Author(s):  
Jonathan B. Freund
Keyword(s):  
Prediction Accuracy ◽  
Jet Noise ◽  
Sound Field ◽  
Field Measurements ◽  
Detailed Comparison ◽  
Large Eddy Simulations ◽  
Noise Prediction ◽  
Large Eddy ◽  
Modelling Procedure ◽  
Flow Turbulence

Jet noise prediction is notoriously challenging because only subtle features of the flow turbulence radiate sound. The article by Brès et al. (J. Fluid Mech., vol. 851, 2018, pp. 83–124) shows that a well-constructed modelling procedure for the nozzle turbulence can provide unprecedented sub-dB prediction accuracy with modest-scale large-eddy simulations, as confirmed by detailed comparison with turbulence and sound-field measurements. This both illuminates the essential mechanisms of the flow and facilitates prediction for engineering design.

Optical fiber coupler array for multi-point sound field measurements

1997 ◽  
Vol 4 (1) ◽  
pp. A65-A68 ◽  
Author(s):  
Kentaro Nakamura ◽  
Koichiro Fukaya
Keyword(s):  
Optical Fiber ◽  
Sound Field ◽  
Field Measurements ◽  
Optical Fiber Coupler ◽  
Fiber Coupler

Comparison of 48‐point 3‐D anechoic and diffuse sound field measurements of directivity index

2005 ◽  
Vol 118 (3) ◽  
pp. 1859-1859
Author(s):  
Ron Scicluna ◽  
Mead Killion ◽  
Andy Haapapuro ◽  
Stephen Julstrom
Keyword(s):  
Sound Field ◽  
Field Measurements

A Compressed Sensing Framework for Dynamic Sound-Field Measurements

2018 ◽  
Vol 26 (11) ◽  
pp. 1962-1975 ◽  
Author(s):  
Fabrice Katzberg ◽  
Radoslaw Mazur ◽  
Marco Maass ◽  
Philipp Koch ◽  
Alfred Mertins
Keyword(s):  
Compressed Sensing ◽  
Sound Field ◽  
Field Measurements

Simulation and Experimental Study of Ultrasonic Cleaning Based on Multi-Field Coupling

2013 ◽  
Vol 816-817 ◽  
pp. 1270-1273
Author(s):  
Qing Dong Hao ◽  
Fang Yi Li ◽  
Bao Long Gong
Keyword(s):  
Cross Sections ◽  
Staining Method ◽  
Three Dimensional ◽  
Sound Field ◽  
Field Measurements ◽  
Comsol Multiphysics ◽  
Ultrasonic Cleaning ◽  
Field Coupling ◽  
Cleaning Machine ◽  
Three Dimensional Models

In current Ultrasonic Cleaning simulation, high calculation complexity and low precision is a big problem. The disadvantages of reflecting the sound field characteristics inaccurately and quantitative difficulties exist in the sound field measurements. Firstly, the two-dimensional and three-dimensional models of Ultrasonic Cleaning are established in COMSOL Multiphysics and corresponding cleaning effects under different frequencies are simulated, then the frequencies of cleaning machine suitable for remanufactured components are determined. Finally, by means of staining method, sound field distribution on different work cross-sections in the Ultrasonic Cleaning process is studied. Halcon and Matlab are used in our investigation to deal with the experiment results in order to provide a new idea on the measurement of the sound field of Ultrasonic Cleaning.

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