An Evaluation of the Lighthill Analogy for Jet Mixing Noise Generation: Using LV Turbulence, Source Location and Spectral Noise Data

1979 ◽  
pp. 146-152 ◽  
Author(s):  
J. C. Lau ◽  
B. J. Tester
Keyword(s):  
Source Location ◽  
Noise Generation ◽  
Jet Mixing ◽  
Noise Data ◽  
Mixing Noise

Effects of forward flight on jet mixing noise from fine-scale turbulence

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1261-1269 ◽  
Author(s):  
Christopher K. W. Tam ◽  
Nikolai Pastouchenko ◽  
Laurent Auriault
Keyword(s):  
Fine Scale ◽  
Forward Flight ◽  
Jet Mixing ◽  
Mixing Noise ◽  
Scale Turbulence

The effects of forward flight on jet mixing noise from fine scale turbulence

2000 ◽  
Author(s):  
Christopher Tam ◽  
Nikolai Pastouchenko ◽  
Laurent Auriault
Keyword(s):  
Fine Scale ◽  
Forward Flight ◽  
Jet Mixing ◽  
Mixing Noise ◽  
Scale Turbulence

Prediction of jet mixing noise at high subsonic flight

1997 ◽  
Author(s):  
Kingo Yamamoto ◽  
Joseph Wat ◽  
Thomas Austin ◽  
Robert Golub ◽  
Kingo Yamamoto ◽  
...  
Keyword(s):  
Jet Mixing ◽  
Mixing Noise

Effects of Shock Waves on Jet Mixing and Noise Generation

1995 ◽  
pp. 379-384
Author(s):  
K. Kailasanath ◽  
J. P. Boris ◽  
A. M. Landsberg
Keyword(s):  
Shock Waves ◽  
Noise Generation ◽  
Jet Mixing

scholarly journals Jet mixing noise suppression by means of a claw mixer: Revision of the nail configuration to improve the high-frequency acoustic property

2014 ◽  
Vol 9 (3) ◽  
pp. JFST0044-JFST0044
Author(s):  
Tatsuya ISHII ◽  
Shunji ENOMOTO ◽  
Satoru NAKAMURA ◽  
Hitoshi ISHIKAWA
Keyword(s):  
High Frequency ◽  
Noise Suppression ◽  
Acoustic Property ◽  
Jet Mixing ◽  
Mixing Noise

Magnetic Noise in Induction Motors

2008 ◽  
Author(s):  
Radu S. Curiac ◽  
Sumit Singhal
Keyword(s):  
Induction Motor ◽  
High Voltage ◽  
Induction Motors ◽  
Mechanical Design ◽  
Magnetic Noise ◽  
Noise Generation ◽  
Design Phase ◽  
Coil Design ◽  
Noise Data ◽  
And Control

Noise in large high voltage induction motors (500Hp–18000Hp) may be airborne or magnetic in nature. Usually, large high voltage induction motors are custom built and tailored to meet customer’s demand. Since every motor is unique in its design, it is imperative to predict accurately the magnetic noise generation during design phase, this way avoiding expensive rework cost and not loosing the customer confidence. Stator – rotor mechanical design, along with careful electrical coil design, can significantly cut down magnetic noise in an induction motor. This paper discusses the various causes and control of magnetic noise in large induction motors. Theoretical noise predictions in large induction motors, along with measured experimental noise data, are presented.

Crackle - A dominant component of supersonic jet mixing noise

2000 ◽  
Author(s):  
A. Krothapalli ◽  
L. Venkatakrishnan ◽  
L. Lourenco
Keyword(s):  
Supersonic Jet ◽  
Jet Mixing ◽  
Dominant Component ◽  
Mixing Noise

scholarly journals Prediction of jet mixing noise with Lighthill's Acoustic Analogy and geometrical acoustics

2017 ◽  
Vol 141 (2) ◽  
pp. 1203-1213 ◽  
Author(s):  
Carlos R. S. Ilário ◽  
Mahdi Azarpeyvand ◽  
Victor Rosa ◽  
Rod H. Self ◽  
Júlio R. Meneghini
Keyword(s):  
Acoustic Analogy ◽  
Jet Mixing ◽  
Geometrical Acoustics ◽  
Mixing Noise

Acoustic analysis of starting jets in an anechoic chamber

2020 ◽  
Author(s):  
Jörn Lothar Sesterhenn ◽  
Juan Jose Peña Fernández ◽  
Valeria Cigala ◽  
Ulrich Küppers ◽  
Don Dingwell
Keyword(s):  
Acoustic Analysis ◽  
Pressure Ratio ◽  
Maximum Velocity ◽  
Volcanic Eruptions ◽  
Anechoic Chamber ◽  
Nozzle Geometry ◽  
Jet Mixing ◽  
Frequency Space ◽  
Time Frequency ◽  
Mixing Noise

<p>Explosive volcanic eruptions emanate complex acoustic signals. They<br>are influenced by several parameters, most of most of which are highly<br>unconstrained in volcanic setting.</p><p>We investigate the acoustics of starting jets analogous to<br>volcanic jets at high Mach numbers and with different nozzle<br>geometries, in a controlled environment. For the first time in<br>volcanic analog studies, an anechoic chamber is used to eliminate<br>contamination of the signals by reflections from any wall or<br>obstacle.  The analysis concentrates on the identification of the<br>principal jet noise components including: compression waves, vortex<br>ring noise, turbulent jet mixing noise,  broadband shock noise and<br>screech. We employed a shock tube apparatus and signals were recorded<br>using a microphone array.  Employing wavelet analysis, we have<br>identified the noise sources in both time- and frequency-space.</p><p>We have identified the principal sound sources of the jet in<br>time-frequency space and have analyzed their behaviour with respect to<br>changes in pressure ratio $p/p_\infty$ ,non-dimensional mass supply<br>L/D and exit-to-throat area ratio.</p><p>We find that at higher pressure ratios the peak frequency of the<br>broadband shock noise is noticeably lower whereas the amplitude is<br>higher. The non-dimensional mass supply controls whether a jet forms<br>and its blowing duration and maximum velocity. The nozzle geometry has<br>a markable effect on delay of the shock-shear layer-vortex ring<br>interaction with respect to the compression wave.</p><p>Changes in parameters of the starting jet leave a clear and<br>interpretable trace in the observed sound pattern. This quantitative<br>parametrisation of these effects is essential for utilizing these<br>findings as well as field observations for the solution of the inverse<br>problem in the lab and in nature.</p><p> </p>

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