An extensive flight test campaign was recently completed which aims to reduce the noise generated by helicopters in an effort to improve community acceptance. Using a ground-based microphone array, acoustic measurements were acquired on helicopters in the medium-size vehicle weight class over a number of flight conditions including steady level flight, steady descents, and approaches. While data were collected across four helicopters, the Leonardo AW139 and Sikorsky S-76D will be the focus of this paper. The extent of measured ground noise con- tours was limited due to the site constraints. Thus, the Noise Informed Community Environment Operations Planning System (NICEOPS) in conjunction with the flight test data was used to estimate how changes in the operating procedures impact noise exposure over a wider area during approaches. It was found that even small longitudinal accelerations can have a substantial influence on the noise generation processes during approach and must be modeled appropriately to develop new flight procedures which minimize the acoustic impact on the ground.
Medium-Sized Helicopter Noise Abatement Flight Test
2020
12 pages
Report
No indication
English
MEDIUM-SIZED HELICOPTER NOISE ABATEMENT FLIGHT TEST
TIBKAT | 2020
|Medium-Sized Helicopter Noise Abatement Flight Test
NTIS | 2020
|MEDIUM-SIZED HELICOPTER NOISE ABATEMENT FLIGHT TEST
British Library Conference Proceedings | 2020
|