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Interior noise reduction in a large civil helicopter
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Howlett, J. T. Clevenson, S. A. Rypf, J. A. Snyder, W. J. |
| Copyright Year | 1977 |
| Description | The results of an evaluation of the effectiveness of current noise reduction technology in attaining acceptable levels of interior noise in a large (about 20,000 kg) passenger-carrying helicopter are presented. The helicopter studied is a modified CH-53A with a specially designed, acoustically treated passenger cabin. The acoustic treatment reduced the average A-weighted interior noise levels from 115 db to 87 db. The study suggests selected improvements in the acoustic treatment which could result in additional reduction in cabin noise levels. The resulting levels would be only slightly greater than the interior noise levels of current narrow-body jet transports. |
| File Size | 2848088 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770021967 |
| Archival Resource Key | ark:/13960/t41s1kz3j |
| Language | English |
| Publisher Date | 1977-07-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Aircraft Compartments Acoustic Properties Noise Reduction Aircraft Noise Helicopters 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 |
