Recent developments in helicopter rotor noise prediction at NASA

1999 ◽  
Vol 105 (2) ◽  
pp. 1184-1184
Author(s):  
Kenneth S. Brentner
Keyword(s):  
Helicopter Rotor ◽  
Noise Prediction ◽  
Rotor Noise ◽  
Recent Developments

Helicopter Rotor Noise Prediction and Control

1969 ◽  
Vol 14 (3) ◽  
pp. 38-47
Author(s):  
Ronald G. Schlegel ◽  
William E. Bausch
Keyword(s):  
Sound Pressure ◽  
Rotor Blades ◽  
Helicopter Rotor ◽  
Noise Prediction ◽  
Spectrum Shape ◽  
Rotor Noise ◽  
Blade Area ◽  
Prediction And Control ◽  
Blade Tip ◽  
And Control

This paper summarizes the results of Sikorsky Aircraft's research in the prediction and control of helicopter rotor noise. The work to he discussed was partly funded by the U.S. Army Aviation Material Laboratories under Contracts DA 44‐177‐AMC‐141(T) and DA 44‐177‐AMC‐448(T). An improved procedure has been developed for the prediction of main rotor vortex noise under conditions of uniform inflow for a single rotor helicopter. Both the overall sound pressure level and the spectrum shape of the vortex noise from square tipped blades can be calculated as a function of tip speed, blade area, and thrust. The geometry of the blade tip can alter both levels and spectrum shape appreciably. The USAAVLABS contracts also resulted in two computerized analyses for rotational noise prediction. Both analyses extend the work of Gutin to include the noise produced by harmonics of airload acting on the rotor blades. These analyses have demonstrated the importance of the higher harmonics of airload and the chordwise distribution of loading for accurate rotational noise prediction.

Helicopter Rotor Noise Prediction and Control

1969 ◽  
Vol 14 (3) ◽  
pp. 38-47 ◽  
Author(s):  
Ronald G. Schlegel ◽  
William E. Bausch
Keyword(s):  
Helicopter Rotor ◽  
Noise Prediction ◽  
Rotor Noise ◽  
Prediction And Control ◽  
And Control

Helicopter Rotor Noise Prediction Using ONERA and DLR Euler/Kirchhoff Methods

1999 ◽  
Vol 44 (2) ◽  
pp. 121-131 ◽  
Author(s):  
Cyril Polacsek ◽  
Joe¨lle Zibi ◽  
Olivier Rouzaud ◽  
Martin Kuntz
Keyword(s):  
Helicopter Rotor ◽  
Noise Prediction ◽  
Rotor Noise

Helicopter rotor noise prediction using a convected FW-H equation in the frequency domain

2018 ◽  
Vol 140 ◽  
pp. 122-131 ◽  
Author(s):  
Zhongjie Huang ◽  
Leonidas Siozos-Rousoulis ◽  
Tim De Troyer ◽  
Ghader Ghorbaniasl
Keyword(s):  
Frequency Domain ◽  
Helicopter Rotor ◽  
Noise Prediction ◽  
Rotor Noise

Advanced open rotor noise prediction

2014 ◽  
Vol 118 (1208) ◽  
pp. 1125-1135 ◽  
Author(s):  
M. J. Kingan
Keyword(s):  
High Speed ◽  
Broadband Noise ◽  
Current Status ◽  
Prediction Methods ◽  
Noise Prediction ◽  
Acoustic Data ◽  
Rotor Noise ◽  
Future Challenges ◽  
Open Rotor ◽  
Development And Validation

Abstract The purpose of this paper is to describe the current status of open rotor noise prediction methods and to highlight future challenges in this area. A number of analytic and numerical methods are described which can be used for predicting ‘isolated’ and ‘installed’ open rotor tonal noise. Broadband noise prediction methods are also described and it is noted that further development and validation of the current models is required. The paper concludes with a discussion of the analytical methods which are used to assess the acoustic data collected during the high-speed wind-tunnel testing of a model scale advanced open rotor rig.

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