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Sel and epnl noise duration coefficients for the 747 and t-38 aircraft
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Willshire Jr., W. L. |
| Copyright Year | 1981 |
| Description | Duration coefficient were calculated for Boeing 747 and T-38 airplanes for sound exposure level (SEL) and effective perceived noise level (EPNL) scales. The measured SEL suration coefficients were 8.4 for the Boeing 747 and 5.5 for the T-38 result was in good agreement with a previous result for a similar F-5 airplane. In EPNL, the duration coefficients were 7.2 for the Boeing 747 and 5.7 for the T-38. The difference in the results between the two airplanes is believed to be due to their different engine noise source spectra. The difference in the Boeing 747 results in the two different metric was due to the different frequency weighting of A-weighted sound pressure level, used in SEL, and tone-corrected perceived noise level, used in EPNL, when applied to the 747 spectra. |
| File Size | 242324 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820003987 |
| Archival Resource Key | ark:/13960/t5w718x5v |
| Language | English |
| Publisher Date | 1981-09-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Boeing 747 Aircraft Effective Perceived Noise Levels Jet Aircraft Noise Bypass Ratio Engine Noise Acoustic Propagation Time Noise Measurement Noise Spectra T-38 Aircraft Sound Pressure F-5 Aircraft Audio Frequencies Acoustic Attenuation 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 |
