Author: A. H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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.
Study of Noise-Certification Standards for Aircraft Engines. Volume 3. Selection and Evaluation of Engine-Noise-Certification Concept
Author: A. H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
Book Description
Study of Noise-certification Standards for Aircraft Engines
Author: Alan H. Marsh
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 90
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 90
Book Description
Study of Noise-Certification Standards for Aircraft Engines. Volume 1. Noise-Control Technology for Turbofan Engines
Author: Alan H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
Book Description
This study, reported in three volume, 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 (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. The scope of the study was limited to aircraft turbofan engines. Volume 1 identifies sources of noise produced by aircraft turbofan engines, proposes a working definition of an engine's envelope within which an engine manufacturer may incorporate noise control design features, and evaluates applications of noise-control designs to 22 experimental and production versions of turbofan engines developed over a period from late 1950s to the mid 1970s and ranging in nominal take-off-rated thrust from 7.2 to 236 kN (1600 to 53 000 lb). A description is included of the general procedure for selecting appropriate noise-control designs applicable within the engine envelope for various sources of engine noise.
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
Book Description
This study, reported in three volume, 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 (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. The scope of the study was limited to aircraft turbofan engines. Volume 1 identifies sources of noise produced by aircraft turbofan engines, proposes a working definition of an engine's envelope within which an engine manufacturer may incorporate noise control design features, and evaluates applications of noise-control designs to 22 experimental and production versions of turbofan engines developed over a period from late 1950s to the mid 1970s and ranging in nominal take-off-rated thrust from 7.2 to 236 kN (1600 to 53 000 lb). A description is included of the general procedure for selecting appropriate noise-control designs applicable within the engine envelope for various sources of engine noise.
Study of Noise-certification Standards for Aircraft Engines
Author: Alan H. Marsh
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 58
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 58
Book Description
Study of Noise-Certification Standards for Aircraft Engines. Volume 2. Procedures for Measuring Far Field Sound Pressure Levels Around an Outdoor Jet-Engine Test Stand
Author: Alan H. Marsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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.
NASA SP.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 706
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 706
Book Description
Transportation... Weekly Government Abstracts
Author:
Publisher:
ISBN:
Category : Transportation
Languages : en
Pages : 570
Book Description
Publisher:
ISBN:
Category : Transportation
Languages : en
Pages : 570
Book Description
Study of Noise-certification Standards for Aircraft Engines: Noise-control technology for turbofan engines
Author: Alan H. Marsh
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 0
Book Description
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1092
Book Description
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
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1092
Book Description
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