A Frequency-Domain Numerical Method for Noise Radiation from Ducted Fans

2002 ◽  
Author(s):  
Yusuf Ozyoruk ◽  
Emre Alpman ◽  
Vineet Ahuja ◽  
Lyle Long
Keyword(s):  
Numerical Method ◽  
Frequency Domain ◽  
Noise Radiation

scholarly journals Frequency-Domain Linearized Euler Model for Turbomachinery Noise Radiation Through Engine Exhaust

AIAA Journal ◽  
2010 ◽  
Vol 48 (4) ◽  
pp. 848-858 ◽  
Author(s):  
Andrea Iob ◽  
Renzo Arina ◽  
Claudia Schipani
Keyword(s):  
Frequency Domain ◽  
Engine Exhaust ◽  
Noise Radiation ◽  
Euler Model

Design of acoustic foam wedge panels by finite element frequency domain acoustical analysis

2019 ◽  
Vol 55 (3) ◽  
pp. 283-295
Author(s):  
Huoy-Shyi Tsay ◽  
Fung-Huei Yeh
Keyword(s):  
Finite Element ◽  
Numerical Method ◽  
Frequency Domain ◽  
Acoustic Field ◽  
High Frequency ◽  
Sound Absorption ◽  
Wedge Angle ◽  
Cross Sectional ◽  
Calculation Time ◽  
Acoustical Analysis

Acoustic foam wedge panels provide good sound absorption qualities in the mid and high frequency ranges. In this study, a finite element frequency domain acoustical analysis is used for analysis. Such a numerical method is more efficient than the earlier studies by saving the calculation time on the elements of the incident acoustic field. During the design of a wedge panel, the cross-sectional width and the area of one section of the wedge panel are kept the same throughout the study. By varying the wedge angle, the maximum sound absorption capability of the wedge foam can be found. It is concluded that in the interested frequency regions, 100–4000 and 2000–4000 Hz, the wedge foam with wedge angle of 31° has the excellent sound absorption capability.

APPROXIMATION OF SCALAR WAVES IN THE SPACE-FREQUENCY DOMAIN

1994 ◽  
Vol 04 (04) ◽  
pp. 509-531 ◽  
Author(s):  
JIM DOUGLAS ◽  
DONGWOO SHEEN ◽  
JUAN E. SANTOS
Keyword(s):  
Numerical Method ◽  
Frequency Domain ◽  
Space Frequency ◽  
Scalar Waves

A numerical method for approximating a pseudodifferential system describing attenuated, scalar waves is introduced and analyzed. Analytic properties of the solutions of the pseudodifferential systems are determined and used to show convergence of the numerical method. Experiments using the method are reported.

Frequency-domain prediction of turbofan noise radiation

2004 ◽  
Vol 270 (4-5) ◽  
pp. 933-950 ◽  
Author(s):  
Y. Özyörük ◽  
E. Alpman ◽  
V. Ahuja ◽  
L.N. Long
Keyword(s):  
Frequency Domain ◽  
Noise Radiation ◽  
Domain Prediction

scholarly journals A Frequency-Domain Linearized Euler Model for Noise Radiation

10.5772/19145 ◽  
2011 ◽  
Author(s):  
Andrea Iob ◽  
Roberto Della Ratta Rinaldi ◽  
Renzo Ari
Keyword(s):  
Frequency Domain ◽  
Noise Radiation ◽  
Euler Model
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