Passive Control of Supersonic Throughflow Turbomachine Discrete Frequency Noise Generation by Aerodynamic Detuning

1992 ◽  
Vol 39 (2) ◽  
pp. 57
Author(s):  
Sanford Fleeter
Keyword(s):  
Passive Control ◽  
Frequency Noise ◽  
Noise Generation ◽  
Discrete Frequency

scholarly journals Effect of Resonant Environment on Discrete Frequency Noise Generation from a Two-Dimensional Airfoil

2021 ◽  
Vol 1909 (1) ◽  
pp. 012007
Author(s):  
K. Yamada ◽  
M. Furukawa ◽  
S. Sakurada ◽  
T. Mizokami ◽  
S. Aso ◽  
...  
Keyword(s):  
Frequency Noise ◽  
Noise Generation ◽  
Two Dimensional ◽  
Discrete Frequency

scholarly journals Discrete Frequency Noise Generation due to Fluid Flow Over Blades, Supporting Spokes, and Similar Bodies

1969 ◽  
Author(s):  
R. Parker
Keyword(s):  
Fluid Flow ◽  
Pressure Fluctuations ◽  
Mechanical Vibration ◽  
Acoustic Resonance ◽  
Frequency Noise ◽  
Noise Generation ◽  
Flat Plates ◽  
Discrete Frequency ◽  
Order Of Magnitude ◽  
Low Speed Wind Tunnel

The author reviews, briefly, previous work on the excitation of powerful acoustic resonances by periodicity in the wakes shed by blades, flat plates, spokes, or other similar bodies in a fluid flow. He presents further experimental data, from low-speed wind-tunnel tests, that add to the understanding of the phenomenon, but there is still a great deal that is not understood regarding the mechanism of excitation. While mechanical vibration can be excited, it has been established conclusively that this does not play any part in generating the intense discrete frequency noise observed in many cases. In the present tests, the amplitude of forced vibration of a plate due to the pressure fluctuations at an acoustic resonance was an order of magnitude greater than the amplitude of the directly excited mechanical resonance.

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