Study of Noise-certification Standards for Aircraft Engines PDF Download
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Author: Alan H. Marsh
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 90
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Book Description
Author: Alan H. Marsh
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 90
Get Book Here
Book Description
Author: Alan H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
This study, reported in three volumes, had the purpose of considering the feasibility of establishing an FAA requirement for a manufacturer of aircraft engines to demonstrate compliance with an engine noise-level standard in order to obtain an engine-noise type certificate. The objective of engine-noise type certification would be to supplement the aircraft-noise type certification requirements in Part 36 of the Federal Aviation Regulations. The scope of the study was limited to aircraft turbofan engines. Volume 2 describes the general characterisitics of 16 outdoor engine test stands used by 11 organizations for measurements of engine noise levels. Instruments and microphone installations are also described. Recommendations are presented for test procedures to measure farfield sound pressure levels around a turbofan engine mounted on an outdoor test stand. After adjusting the measured data to common reference conditions, the test results should be suitable for demonstrating compliance with the requirements for a static-engine noise type certificate.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 688
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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 : Aeronautics
Languages : en
Pages : 592
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Book Description
Author: A. H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
The purpose of this 3-volume study was to consider the feasibility of establishing an FAA requirement for a manufacturer of aircraft engines to demonstrate compliance with an engine noise-level standard in order to obtain an engine-noise type certificate. The objective of engine-noise type certification (if feasible on the basis of economic reasonableness, technological practicality, and appropriateness to the type design) would be to supplement the aircraft-noise type certification requirements in Part 36 of the Federal Aviation Regulations. This study was limited to aircraft jet engines. Volume 3 describes the selection of a concept for the noise-evaluation quantity, namely the A-frequency-weighted sound power made nondimensional by a power-like quantity equal to the product of total net static thrust and the speed of sound in the ambient air. The recommended independent variable is total net static thrust made nondimensional by the product of total mass flow rate and the speed of sound in the ambient air. Farfield 1/3-octave-band sound pressure levels, measured around production and experimental versions of aircraft turbojet and turbofan engines, were used to test the utility and applicability of the recommended noise-evaluation quantity. Engines ranged in rated static thrust from 11 kN to 222 kN (2500 lb to 50,000 lb). For certification purposes, a certifying authority would select appropriate limits on the magnitude of the noise-evaluation quantity applicable to thrust settings representative of takeoff and landing approach.
Author: United States. Federal Aviation Administration
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 60
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 586
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Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Author: United States. Office of Noise Abatement and Control
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 312
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Book Description
Author: United States. Federal Aviation Administration
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 76
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1032
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Book Description
