| タイトル | The effect of aircraft speed on the penetration of sonic boom noise into a flat ocean |
| 本文（外部サイト） | http://hdl.handle.net/2060/19950008473 |
| 著者（英） | Sparrow, Victor W. |
| 著者所属（英） | Pennsylvania State Univ. |
| 発行日 | 1994-10-01 |
| 言語 | eng |
| 内容記述 | As U.S. aircraft manufacturers now have focused their HSCT efforts on overwater supersonic flight, a great deal more must be known about sonic booms propagating overwater and interacting with the ocean. For example, it is thought that atmospheric turbulence effects are often much less severe over water than over land. Another important aspect of the overwater flight problems is the penetration of the sonic boom noise into the ocean, where there could be an environmental impact on sea life. This talk will present a brief review on the penetration of sonic boom noise into a large body of water with a flat surface. It has been determined recently that faster supersonic speeds imply greater penetration of sonic boom noise into the ocean. The new theory is derived from the original Sawyers paper and from the knowledge that for level flight a boom's duration is proportional to the quantity M/(M(exp 2)-1)(exp 3/8) where M is the Mach number. It is found that for depths of 10 m or less, the peak SPL varies less than 6 dB over a wide range of M. For greater depths, 100 m for example, increased Mach numbers may increase the SPL by 15 dB or more. |
| NASA分類 | ACOUSTICS |
| レポートNO | 95N14887 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/109572 |
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