Phased Array Beamforming with 100-Foot Polar Arc Microphones in a Static Engine Noise Test

2008 ◽  
Author(s):  
Robert Dougherty ◽  
Jeff Mendoza
Keyword(s):  
Phased Array ◽  
Engine Noise ◽  
Noise Test ◽  
Array Beamforming

scholarly journals Limitations of Phased Array Beamforming in Open Rotor Noise Source Imaging

AIAA Journal ◽  
2014 ◽  
Vol 52 (8) ◽  
pp. 1810-1817 ◽  
Author(s):  
Csaba Horváth ◽  
Edmane Envia ◽  
Gary G. Podboy
Keyword(s):  
Phased Array ◽  
Noise Source ◽  
Source Imaging ◽  
Rotor Noise ◽  
Open Rotor ◽  
Array Beamforming

scholarly journals High Gain and Low-Profile Stacked Magneto-Electric Dipole Antenna for Phased Array Beamforming

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 180295-180304 ◽  
Author(s):  
Hyun-Jun Dong ◽  
Ye-Bon Kim ◽  
Jingon Joung ◽  
Han Lim Lee
Keyword(s):  
Electric Dipole ◽  
Phased Array ◽  
High Gain ◽  
Dipole Antenna ◽  
Low Profile ◽  
Array Beamforming

Noise Test and Analysis of Automobile Engine

2013 ◽  
Vol 307 ◽  
pp. 196-199 ◽  
Author(s):  
Yan Liu ◽  
Yan Bin Jia ◽  
Xiao Juan Zhang ◽  
Zong Cai Liu ◽  
Yong Chao Ren ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Sound Insulation ◽  
Engine Noise ◽  
High Frequency Part ◽  
Speed Measure ◽  
Dash Panel ◽  
Noise Frequency ◽  
Noise Test ◽  
Analysis Engine

To test different car’s noise in a semi-anechoic room with different engine’s speed, measure and analysis engine noise’s characteristics and the dash panel’s sound insulation quantity. The conclusion is that：the engine noise gets bigger 10 dB(A) when engine speeds up every 1000 r/min; engine noise’s frequency mainly distributed in 1600 ~ 4000 Hz; peak part concentrates in the range 100 ~ 400 Hz; engine noise has no direct relation to engine’s displacement; cab noise frequency mainly concentrated in the range 250 ~ 630 Hz and the peaks exist in the intermediate and low frequency part, the high frequency part attenuates obviously which show the car’s dash panel has a good noise insulation and absorption effect in the high frequency part but not too ideal at the intermediate and low frequency especially in the range 250 ~ 630 Hz. These results have high practical value for the design of the automotive to decline noise and vibration.

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