scholarly journals Fast prediction method of aircraft noise with distributed propulsion in the far field

2021 ◽  
Vol 1925 (1) ◽  
pp. 012007
Author(s):  
B Chen ◽  
A A Yakovlev ◽  
P A Moshkov
Keyword(s):  
Prediction Method ◽  
Aircraft Noise ◽  
Far Field ◽  
Distributed Propulsion ◽  
Fast Prediction

Characterization of near‐ and far‐field nonlinearity in high‐performance military jet aircraft noise.

2010 ◽  
Vol 127 (3) ◽  
pp. 1877-1877
Author(s):  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
J. Micah Downing ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Aircraft Noise ◽  
Far Field

A Fast Prediction Method of Acoustic Radiation of Underwater Unmanned Vehicle

2021 ◽  
Author(s):  
Zhi-Gang Liu ◽  
Xian-Wen Zhao ◽  
Zhou Chen ◽  
Zheng-Wei Wang ◽  
Mo-Ran Wang ◽  
...  
Keyword(s):  
Acoustic Radiation ◽  
Prediction Method ◽  
Unmanned Vehicle ◽  
Fast Prediction

Fast prediction method of Archie’s cementation exponent

2016 ◽  
Vol 34 ◽  
pp. 291-297 ◽  
Author(s):  
Zhen Qin ◽  
Heping Pan ◽  
Huolin Ma ◽  
Ahmed Amara Konaté ◽  
Min Hou ◽  
...  
Keyword(s):  
Prediction Method ◽  
Fast Prediction

Effective Far-Field Acoustic Prediction Method and Its Computational Aeroacoustics Applications

AIAA Journal ◽  
2009 ◽  
Vol 47 (2) ◽  
pp. 410-417 ◽  
Author(s):  
Chao Yu ◽  
Zhengfang Zhou ◽  
Mei Zhuang ◽  
Xiaodong Li ◽  
Frank Thiele
Keyword(s):  
Prediction Method ◽  
Computational Aeroacoustics ◽  
Far Field

Direct computation of the sound generated by vortex pairing in an axisymmetric jet

1999 ◽  
Vol 383 ◽  
pp. 113-142 ◽  
Author(s):  
BRIAN E. MITCHELL ◽  
SANJIVA K. LELE ◽  
PARVIZ MOIN
Keyword(s):  
Mach Number ◽  
Stokes Equations ◽  
Near Field ◽  
Prediction Method ◽  
Axial Direction ◽  
Navier Stokes ◽  
Far Field ◽  
Source Terms ◽  
Vortex Pairing ◽  
Field Sound

The sound generated by vortex pairing in axisymmetric jets is determined by direct solution of the compressible Navier–Stokes equations on a computational grid that includes both the near field and a portion of the acoustic far field. At low Mach number, the far-field sound has distinct angles of extinction in the range of 60°–70° from the jet's downstream axis which can be understood by analogy to axisymmetric, compact quadrupoles. As the Mach number is increased, the far-field sound takes on a superdirective character with the dominant sound directed at shallow angles to the jet's downstream axis. The directly computed sound is compared to predictions obtained from Lighthill's equation and the Kirchhoff surface method. These predictions are in good agreement with the directly computed data. The Lighthill source terms have a large spatial distribution in the axial direction necessitating the introduction of a model to describe the source terms in the region downstream of the last vortex pairing. The axial non-compactness of the quadrupole sources must be adequately treated in the prediction method.

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