Dual-shaped-reflector directivity pattern synthesis using the successive projections method

1999 ◽  
Vol 146 (2) ◽  
pp. 119 ◽  
Author(s):  
S.G. Hay
Keyword(s):  
Directivity Pattern ◽  
Pattern Synthesis ◽  
Successive Projections

Power pattern synthesis for mesh reflectors using the method of successive projections

1992 ◽  
Vol 28 (19) ◽  
pp. 1837 ◽  
Author(s):  
H. Zhou ◽  
P.J.B. Clarricoats ◽  
G.T. Poulton ◽  
S.G. Hay
Keyword(s):  
Pattern Synthesis ◽  
Power Pattern ◽  
Successive Projections

A Pattern Synthesis Technique for Multiplicative Arrays

PIERS Online ◽  
2010 ◽  
Vol 6 (6) ◽  
pp. 551-554 ◽  
Author(s):  
Herbert M. Aumann
Keyword(s):  
Pattern Synthesis ◽  
Synthesis Technique

Pattern Synthesis Method for Arbitrary Arrays

2011 ◽  
Vol 30 (3) ◽  
pp. 738-741
Author(s):  
Xia Zhang ◽  
Hai-hong Tao ◽  
Gui-sheng Lian
Keyword(s):  
Synthesis Method ◽  
Pattern Synthesis

Pattern synthesis of array antennas in presence of conducting bodies of arbitrary shape

1997 ◽  
Vol 33 (18) ◽  
pp. 1512 ◽  
Author(s):  
L. Landesa ◽  
F. Obelleiro ◽  
J.L. Rodríguez ◽  
A.G. Pino
Keyword(s):  
Arbitrary Shape ◽  
Pattern Synthesis ◽  
Array Antennas ◽  
Conducting Bodies

Noise source location and scaling of subsonic upper-surface blowing

2020 ◽  
Vol 19 (3-5) ◽  
pp. 191-206
Author(s):  
Trae L Jennette ◽  
Krish K Ahuja
Keyword(s):  
Strouhal Number ◽  
Noise Source ◽  
Low Frequency ◽  
Directivity Pattern ◽  
Source Location ◽  
Dipole Source ◽  
Frequency Noise ◽  
Noise Sources ◽  
Trailing Edge ◽  
Trailing Edge Noise

This paper deals with the topic of upper surface blowing noise. Using a model-scale rectangular nozzle of an aspect ratio of 10 and a sharp trailing edge, detailed noise contours were acquired with and without a subsonic jet blowing over a flat surface to determine the noise source location as a function of frequency. Additionally, velocity scaling of the upper surface blowing noise was carried out. It was found that the upper surface blowing increases the noise significantly. This is a result of both the trailing edge noise and turbulence downstream of the trailing edge, referred to as wake noise in the paper. It was found that low-frequency noise with a peak Strouhal number of 0.02 originates from the trailing edge whereas the high-frequency noise with the peak in the vicinity of Strouhal number of 0.2 originates near the nozzle exit. Low frequency (low Strouhal number) follows a velocity scaling corresponding to a dipole source where as the high Strouhal numbers as quadrupole sources. The culmination of these two effects is a cardioid-shaped directivity pattern. On the shielded side, the most dominant noise sources were at the trailing edge and in the near wake. The trailing edge mounting geometry also created anomalous acoustic diffraction indicating that not only is the geometry of the edge itself important, but also all geometry near the trailing edge.

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