Theoretical models of helicopter rotor noise
Abstract
For low speed rotors, it is shown that unsteady load models are only partially successful in predicting experimental levels. A theoretical model is presented which leads to the concept of unsteady thickness noise. This gives better agreement with test results. For high speed rotors, it is argued that present models are incomplete and that other mechanisms are at work. Some possibilities are briefly discussed.
- Publication:
-
Helicopter Acoustics, Pt. 2
- Pub Date:
- August 1978
- Bibcode:
- 1978heac.nasa...89H
- Keywords:
-
- Aircraft Noise;
- Helicopters;
- Noise Pollution;
- Pollution Control;
- Prediction Analysis Techniques;
- Rotary Wings;
- High Speed;
- Low Speed;
- Noise Intensity;
- Noise Reduction;
- Acoustics