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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781730923272
Category : Science
Languages : en
Pages : 94
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Book Description
The objective of this study is to evaluate the accuracy and adequacy of current airframe noise prediction methods using available airframe noise measurements from tests of a narrow body transport (DC-9) and a wide body transport (DC-10) in addition to scale model test data. General features of the airframe noise from these aircraft and models are outlined. The results of the assessment of two airframe prediction methods, Fink's and Munson's methods, against flight test data of these aircraft and scale model wind tunnel test data are presented. These methods were extensively evaluated against measured data from several configurations including clean, slat deployed, landing gear-deployed, flap deployed, and landing configurations of both DC-9 and DC-10. They were also assessed against a limited number of configurations of scale models. The evaluation was conducted in terms of overall sound pressure level (OASPL), tone corrected perceived noise level (PNLT), and one-third-octave band sound pressure level (SPL). Yamamoto, Kingo J. and Donelson, Michael J. and Huang, Shumei C. and Joshi, Mahendra C. Unspecified Center...
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781730923272
Category : Science
Languages : en
Pages : 94
Get Book Here
Book Description
The objective of this study is to evaluate the accuracy and adequacy of current airframe noise prediction methods using available airframe noise measurements from tests of a narrow body transport (DC-9) and a wide body transport (DC-10) in addition to scale model test data. General features of the airframe noise from these aircraft and models are outlined. The results of the assessment of two airframe prediction methods, Fink's and Munson's methods, against flight test data of these aircraft and scale model wind tunnel test data are presented. These methods were extensively evaluated against measured data from several configurations including clean, slat deployed, landing gear-deployed, flap deployed, and landing configurations of both DC-9 and DC-10. They were also assessed against a limited number of configurations of scale models. The evaluation was conducted in terms of overall sound pressure level (OASPL), tone corrected perceived noise level (PNLT), and one-third-octave band sound pressure level (SPL). Yamamoto, Kingo J. and Donelson, Michael J. and Huang, Shumei C. and Joshi, Mahendra C. Unspecified Center...
Author:
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 87
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Book Description
Author: Kingo J. Yamamoto
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Author: Oleksandr Zaporozhets
Publisher: CRC Press
ISBN: 0203888820
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
Aircraft noise has adverse impacts on passengers, airport staff and people living near airports, it thus limits the capacity of regional and international airports throughout the world. Reducing perceived noise of aircraft involves reduction of noise at source, along the propagation path and at the receiver. Effective noise control demands highly s
Author: Robert G. Rackl
Publisher: BiblioGov
ISBN: 9781289254247
Category :
Languages : en
Pages : 144
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Book Description
This report contains the following information: 1) a review of airframe noise research performed under NASA's Advanced Subsonic Transport (AST) program up to the year 2000, 2) a comparison of the year 1992 airframe noise predictions with those using a year 2000 baseline, 3) an assessment of various airframe noise reduction concepts as applied to the year 2000 baseline predictions, and 4) prioritized recommendations for future airframe noise reduction work. NASA's Aircraft Noise Prediction Program was the software used for all noise predictions and assessments. For future work, the recommendations for the immediate future focus on the development of design tools sensitive to airframe noise treatment effects and on improving the basic understanding of noise generation by the landing gear as well as on its reduction.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721148080
Category :
Languages : en
Pages : 142
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Book Description
This report contains the following information: 1) a review of airframe noise research performed under NASA's Advanced Subsonic Transport (AST) program up to the year 2000, 2) a comparison of the year 1992 airframe noise predictions with those using a year 2000 baseline, 3) an assessment of various airframe noise reduction concepts as applied to the year 2000 baseline predictions, and 4) prioritized recommendations for future airframe noise reduction work. NASA's Aircraft Noise Prediction Program was the software used for all noise predictions and assessments. For future work, the recommendations for the immediate future focus on the development of design tools sensitive to airframe noise treatment effects and on improving the basic understanding of noise generation by the landing gear as well as on its reduction. Rackl, Robert G. and Miller, Gregory and Guo, Yueping and Yamamoto, Kingo Langley Research Center NAS1-97040; 23-781-20-12
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781719375481
Category :
Languages : en
Pages : 32
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Book Description
An acoustic assessment is being conducted by NASA that has been designed to assess the current state of the art in NASA s capability to predict aircraft related noise and to establish baselines for gauging future progress in the field. The process for determining NASA s current capabilities includes quantifying the differences between noise predictions and measurements of noise from experimental tests. The computed noise predictions are being obtained from semi-empirical, analytical, statistical, and numerical codes. In addition, errors and uncertainties are being identified and quantified both in the predictions and in the measured data to further enhance the credibility of the assessment. The content of this paper contains preliminary results, since the assessment project has not been fully completed, based on the contributions of many researchers and shows a select sample of the types of results obtained regarding the prediction of aircraft noise at both the system and component levels. The system level results are for engines and aircraft. The component level results are for fan broadband noise, for jet noise from a variety of nozzles, and for airframe noise from flaps and landing gear parts. There are also sample results for sound attenuation in lined ducts with flow and the behavior of acoustic lining in ducts. Dahl, Milo D. Glenn Research Center AERODYNAMIC NOISE; NOISE PREDICTION; ACOUSTIC DUCTS; JET AIRCRAFT NOISE; AIRCRAFT NOISE; ACOUSTIC ATTENUATION; TECHNOLOGY ASSESSMENT; AIRCRAFT ENGINES; PROGRESS; FAN BLADES; ERRORS
Author: Martin R. Fink
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 135
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Book Description
