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Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hoad, D. R. Conner, D. A. |
| Copyright Year | 1982 |
| Description | The reduction of high speed impulsive noise for the UH-1H helicopter was investigated by using an advanced main rotor system. The advanced rotor system had a tapered blade planform compared with the rectangular planform of the standard rotor system. Models of both the advanced main rotor system and the UH-1H standard main rotor system were tested at 1/4 scale in the 4 by 7 Meter Tunnel. In plane acoustic measurements of the high speed impulsive noise demonstrated that the advanced rotor system on the UH-1H helicopter reduced the high speed impulsive noise by up to 20 dB, with a reduction in overall sound pressure level of up to 5 dB. |
| File Size | 2270524 |
| Page Count | 60 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19830007880 |
| Archival Resource Key | ark:/13960/t11p2xb2n |
| Language | English |
| Publisher Date | 1982-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Tapering Scale Models Noise Reduction Aircraft Noise Uh-1 Helicopter Spectrum Analysis Wind Tunnel Tests 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 |
