scholarly journals Characterization of equivalent acoustic sources to reproduce the acoustic field generated by engines on an aircraft fuselage

2019 ◽  
Vol 24 ◽  
pp. 559-568
Author(s):  
Venanzio Giannella ◽  
Riccardo Lombardi ◽  
Matteo Maria Pisani ◽  
Luigi Federico ◽  
Mattia Barbarino ◽  
...  
Keyword(s):  
Acoustic Field ◽  
Aircraft Fuselage ◽  
Acoustic Sources

Characterization of acoustic sources in a corrugated pipe flow with linear stochastic estimation

2021 ◽  
Vol 150 (6) ◽  
pp. 4268-4282
Author(s):  
Gaëtan Galeron ◽  
Muriel Amielh ◽  
Pierre-Olivier Mattei
Keyword(s):  
Pipe Flow ◽  
Stochastic Estimation ◽  
Linear Stochastic Estimation ◽  
Acoustic Sources

Noise Generated by a Lifted Flame in a Vitiated Co-Flow

2008 ◽  
Author(s):  
Robert Z. Szasz ◽  
Christophe Duwig ◽  
Laszlo Fuchs
Keyword(s):  
Acoustic Field ◽  
Hybrid Approach ◽  
Low Frequency ◽  
Lifted Flame ◽  
Inhomogeneous Wave Equation ◽  
Large Eddy ◽  
Ignition Region ◽  
Acoustic Sources ◽  
Pod Analysis ◽  
Low Frequency Waves

The acoustic field generated by a lifted flame is studied by a hybrid approach. First, Large Eddy Simulations (LES) are used to compute the flow and the acoustic sources. Next, an inhomogeneous wave equation is solved to obtain the resulting acoustic field. The flow computations show good agreement with experimental data. The dominant acoustic sources are found to be located in the ignition region and at the tip of the flame. The acoustic computations revealed the presence of low-frequency waves radiated in the far-field. The shape of the most energetic acoustic modes are identified by POD analysis to be axial modes.

Characterization of Aeroacoustic, Silicon Micromachined Microphones for Aircraft Fuselage Arrays

AIAA Journal ◽  
2012 ◽  
Vol 50 (12) ◽  
pp. 2744-2752 ◽  
Author(s):  
Matthew D. Williams ◽  
Benjamin A. Griffin ◽  
Tiffany N. Reagan ◽  
James R. Underbrink ◽  
Mark Sheplak
Keyword(s):  
Aircraft Fuselage

scholarly journals Sound generation in a mixing layer

1997 ◽  
Vol 330 ◽  
pp. 375-409 ◽  
Author(s):  
TIM COLONIUS ◽  
SANJIVA K. LELE ◽  
PARVIZ MOIN
Keyword(s):  
Acoustic Field ◽  
Stokes Equations ◽  
Near Field ◽  
Mixing Layer ◽  
Navier Stokes ◽  
Far Field ◽  
Source Terms ◽  
Acoustic Analogy ◽  
Navier Stokes Equations ◽  
Acoustic Sources

The sound generated by vortex pairing in a two-dimensional compressible mixing layer is investigated. Direct numerical simulations (DNS) of the Navier–Stokes equations are used to compute both the near-field region and a portion of the acoustic field. The acoustic analogy due to Lilley (1974) is also solved with acoustic sources determined from the near-field data of the DNS. It is shown that several commonly made simplifications to the acoustic sources can lead to erroneous predictions for the acoustic field. Predictions based on the quadrupole form of the source terms derived by Goldstein (1976a, 1984) are in excellent agreement with the acoustic field from the DNS. However, despite the low Mach number of the flow, the acoustic far field generated by the vortex pairings cannot be described by considering compact quadrupole sources. The acoustic sources have the form of modulated wave packets and the acoustic far field is described by a superdirective model (Crighton & Huerre 1990). The presence of flow–acoustic interactions in the computed source terms causes the acoustic field predicted by the acoustic analogy to be very sensitive to small changes in the description of the source.

Characterization of acoustic sources for hypersonic receptivity research

1999 ◽  
Author(s):  
Gregory Buck ◽  
Roger Kimmel ◽  
John Schmisseur
Keyword(s):  
Acoustic Sources

Acoustic characterization of the new Arctic using mobile acoustic sources

2017 ◽  
Vol 142 (4) ◽  
pp. 2714-2714
Author(s):  
John E. Joseph ◽  
D. Benjamin Reeder ◽  
Liam J. Doyle
Keyword(s):  
Acoustic Characterization ◽  
Acoustic Sources

Large-aperture experimental characterization of the acoustic field generated by a hovering unmanned aerial vehicle

2021 ◽  
Vol 150 (3) ◽  
pp. 2046-2057
Author(s):  
Jesse Callanan ◽  
Rayhaan Iqbal ◽  
Revant Adlakha ◽  
Amir Behjat ◽  
Souma Chowdhury ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Acoustic Field ◽  
Experimental Characterization ◽  
Large Aperture ◽  
Aerial Vehicle

Acoustic field characterization of a clinical magnetic resonance-guided high-intensity focused ultrasound system inside the magnet bore

2017 ◽  
Vol 44 (9) ◽  
pp. 4890-4899 ◽  
Author(s):  
Satya V.V.N. Kothapalli ◽  
Michael B. Altman ◽  
Ari Partanen ◽  
Leighton Wan ◽  
H. Michael Gach ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Acoustic Field ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Ultrasound System
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