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Potential reduction of en route noise from an advanced turboprop aircraft
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dittmar, James H. |
| Copyright Year | 1990 |
| Description | When the en route noise of a representative aircraft powered by an eight-blade SR-7 propeller was previously calculated, the noise level was cited as a possible concern associated with the acceptance of advanced turboprop aircraft. Some potential methods for reducing the en route noise were then investigated and are reported. Source noise reductions from increasing the blade number and from operating at higher rotative speed to reach a local minimum noise point were investigated. Greater atmospheric attenuations for higher blade passing frequencies were also indicated. Potential en route noise reductions from these methods were calculated as 9.5 dB (6.5 dB(A)) for a 10-blade redesigned propeller and 15.5 dB (11 dB(A)) for a 12-blade redesigned propeller. |
| File Size | 7616537 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910006529 |
| Archival Resource Key | ark:/13960/t28963s36 |
| Language | English |
| Publisher Date | 1990-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Atmospheric Attenuation Propeller Blades Turboprop Aircraft Propeller Noise Noise Reduction Noise Intensity 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 |
