Comparison of Flyover Noise Data From Aircraft at High Subsonic Speeds with Prediction
Comparison of Flyover Noise Data From Aircraft at High Subsonic Speeds with Prediction

Author: J. Boettcher

Publisher:

Published: 1992

Total Pages: 12

ISBN-13:

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Flyover noise measurements are evaluated for four different military jet aircraft types flying at low altitudes. Flight Mach numbers ranged from 0.5 to 0.9. The analysis shows that noise immission is caused by jet mixing and broadband shock associated noise. Based on the experimental results existing noise prediction schemes are extended toward higher subsonic flight Mach numbers. The novel prediction schemes describe the observed acoustic signatures quite accurately. This holds for the overall sound pressure level in dependence of the emission angle, for sound-pressure level time histories and for one-third-octave spectra.

Monthly Catalog of United States Government Publications
Monthly Catalog of United States Government Publications

Author: United States. Superintendent of Documents

Publisher:

Published: 1978

Total Pages: 1228

ISBN-13:

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February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

A Comparison of Measured Take-Off and Flyover Sound Levels for Several General Aviation Propeller-Driven Aircraft
A Comparison of Measured Take-Off and Flyover Sound Levels for Several General Aviation Propeller-Driven Aircraft

Author: J. F. Wilby

Publisher:

Published: 1984

Total Pages: 137

ISBN-13:

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The Federal Aviation Administration is currently reviewing noise certification procedures for general aviation propeller-driven aircraft. As part of this review noise measurements were made for take-offs and flyovers of several propeller-driven aircraft at Dulles International Airport. The data from the tests were analyzed by FAA in terms of the A-weighted sound level. This analysis indicated that there were general differences between take-off and flyover sound levels. The intent of this report is to present a review of the data without going into detailed analyses. Possible reasons for differences between take-off and flyover sound levels are explored and certain conclusions drawn. Recommendations are then made for future work in order to provide a more-detailed understanding of the physical phenomena involved.

Government Reports Annual Index
Government Reports Annual Index

Author:

Publisher:

Published: 1978

Total Pages: 1062

ISBN-13:

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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.