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A subjective field study of helicopter blade-slap noise
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Powell, C. A. |
| Copyright Year | 1978 |
| Description | The effects of impulsiveness on the noisiness of helicopters are examined by varying the main rotor speed while maintaining a constant airspeed. This resulted in other characteristics of the noise being held relatively constant. Other controlled variables included altitude, side line distance, descent operations, and level flyovers. A description is provided of the concept, experimental design and procedures along with results based on partial analyses of acoustic and subjective response data. No significant improvement in the noisiness predictive ability of EPNL was provided by either proposed or an A-weighted crest factor correction for impulsiveness. |
| File Size | 17566697 |
| Page Count | 89 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780020737 |
| Archival Resource Key | ark:/13960/t3qv8b562 |
| Language | English |
| Publisher Date | 1978-07-01 |
| Access Restriction | Open |
| Subject Keyword | Environment Pollution Human Tolerances Effective Perceived Noise Levels Helicopters Noise Intensity Blade-vortex Interaction Blade Slap Noise Noise Measurement Prediction Analysis Techniques Rotary Wings Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
