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PTA en route noise measurements
| 题名： | PTA en route noise measurements |
| 作者： | Willshire, William L., Jr.; Garber, Donald P. |
| 关键词： | measurement；route；noise；variability；three-dimensional；alternative；ensemble；pagat；predict；turbo |
| 摘要： | A long-range advanced turboprop en route noise database was obtained with weather, tracking, and onboard measurements. In-flight noise directivity measurements were made. Data repeatability within a test day was excellent. Day-to-day variability existed and is not completely understood and therefore not predicted. Comparison of a two-dimensional ray-tracing propagation model with the ensemble average ground-measured data was good; however, as stated above, the day-to-day data variability was not completely predicted. Future research will include looking at alternative propagation models. Three-dimensional ray tracing, fast field program, and the parabolic equation are possibilities. The effect of turbulence needs to be accessed. |
| 报告类型： | 科技报告 |
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