Noise Levels and Data Correction Analysis for Seven General Aviation Propeller Aircraft PDF Download
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Author: David W. Ford
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 396
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Book Description
Author: David W. Ford
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 396
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 594
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 206
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Book Description
Author: J. Steven Newman
Publisher:
ISBN:
Category :
Languages : en
Pages : 193
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Book Description
During the Summer and Fall of 1982, the FAA Office of Environment and Energy, Noise Abatement Division, conducted a noise measurement program to evaluate proposed revisions of International and U.S. noise certification standards for light-weight propeller-driven aircraft. Tests were conducted using both single- and twin-engine propeller-driven light aircraft. Normally aspirated, turbo-charged, and turboprop engines were included, as were both fixed and variable pitch propellers. Takeoff noise measurements were made for eighteen aircraft. Additional measurements for nine of these aircraft (during level flight) provided sufficient data to examine the relationship of noise level versus helical tip Mach Number and engine power setting. This report presents noise measurements, aircraft position data, meteorological data, and cockpit instrument readings acquired during the test. Data analyses include: corrections to proposed noise certification reference conditions, development of Mach Number and Power Correction functions, empirical examination of sound propagation, regression of noise level versus weight (and the logarithm of weight) and correlation of acoustical intensity (AL) and acoustical dose (SEL) noise metrics. While this report concludes that a takeoff noise certification procedure is feasible and will provide consistent results for a given aircraft, it remains uncertain whether or not equal stringency (or even comparable stringency) can be achieved between the existing certification procedure and the proposed takeoff procedure.
Author:
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 64
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Book Description
Author: United States. Federal Aviation Administration
Publisher:
ISBN:
Category : Airports
Languages : en
Pages : 48
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1094
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1072
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Book Description
Author:
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 1192
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Book Description
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.
Author: David Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
This report examines three particular problem areas associated with the measurement of noise levels of propeller-driven small airplanes required to comply with FAR Part 36, Appendix F. These problems are directly related to effects of atmospheric conditions on (1) the performance capabilities of an airplane when tested at various barometric pressures and altitude densities; (2) the noise signature generated at such conditions; and (3) the propagation of sound from the airplane to the measuring station. The first two of these have been addressed by deriving potential correction procedures which could be applied to noise levels obtained by tests not in strict compliance with Appendix F. These corrections are based on aircraft operations conducted within a specific margin of power setting. The corresponding measured noise levels are subsequently corrected for variation of propeller tip speed, forward velocity and barometric pressure relative to predetermined reference conditions. The third effect, that of sound propagation, si examined by applying SAE ARP 866A to a typical propeller airplane noise spectrum and demonstrating the range of A-weight noise levels that would result within a range of ambient conditions. (Author).
