DE-DOPPLERIZATION OF AIRCRAFT ACOUSTIC-SIGNALS

被引：3

作者：

KELLY, JL

WILSON, MR

机构：

[1] Lockheed Engineering and Sciences Company, Inc., Hampton, VA, 23666-1339

来源：

JOURNAL OF AIRCRAFT | 1995年 / 32卷 / 05期

关键词：

D O I：

10.2514/3.46830

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

A de-Dopplerization scheme is devised and applied to both a tonal noise source. an XV-15 aircraft, and a broadband noise source, an F-18 aircraft. The procedure is developed from the conservation equations of fluid mechanics and is described in the article. The de-Doppledzed time history is constructed by using linear interpolation in the measured time history. This was made possible by knowing the position history of the aircraft provided by radar and/or laser tracking. The XV-15 data established that the scheme can accurately account for Doppler frequency shifts. The F-18 data confirms what has been noted in prediction models and static tests pertaining to broadband shock-associated noise. That is, the peak frequency increases and the peaks broaden toward the jet axis. Another issue addressed in the study is the influence of correcting for spherical spreading and Doppler amplitude on the spectral shape and overall sound pressure levels of the source. Results from this investigation confirm that the dominant noise source in high-speed jets is due to turbulent mixing.

引用

页码：1012 / 1017

页数：6

共 10 条

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