Study of Cost/Benefit Tradeoffs Available in Helicopter Noise Technology Applications PDF Download
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Author: R. H. Spencer
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Book Description
This study investigated cost/benefit tradeoffs using the case histories of four helicopters for which design and development were complete, and in three cases, have undergone substantial flight testing. The approach to quieting each helicopter was an incremental reduction of each source as required to obtain reductions in flyover noise with modifications to other secondary systems only as necessary. The methodology used to predict the effects of the design modifications on acquisition, maintenance, and operating costs were typical of those employed by rotorcraft manufacturers. The reduction of helicopter flyover noise generally was achieved through reductions in rotor tip speed. Performance characteristics were maintained to specified minimums for each aircraft in the study. (Author).
Author: R. H. Spencer
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Book Description
This study investigated cost/benefit tradeoffs using the case histories of four helicopters for which design and development were complete, and in three cases, have undergone substantial flight testing. The approach to quieting each helicopter was an incremental reduction of each source as required to obtain reductions in flyover noise with modifications to other secondary systems only as necessary. The methodology used to predict the effects of the design modifications on acquisition, maintenance, and operating costs were typical of those employed by rotorcraft manufacturers. The reduction of helicopter flyover noise generally was achieved through reductions in rotor tip speed. Performance characteristics were maintained to specified minimums for each aircraft in the study. (Author).
Author: R. H. Spencer
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 132
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Book Description
Author: R. H. Spencer
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 132
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Book Description
Author: John F. Wilby
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 163
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 542
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Author: John F. Wilby
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
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Book Description
The current status of aircraft noise control technology is reviewed to identify those measures that have a reasonable potential for application to aircraft coming into service in the 1980's. Noise reduction achievable when these noise control measures are applied to two transport category airplanes, a business jet, and a small propeller-driven twin is determined. Costs and performance penalties are determined for each noise control option. Benefits are measured by reductions in FAR 36 certification noise levels and in reductions in EPNL contour areas. The study shows that current, late 1970's, noise control practices permit transport category airplanes to meet the FAR 36 Stage 3 noise limits, yet application of additional noise control measures is not likely to provide additional reduction of the noise levels for these aircraft by more than 3 decibels. New business jet noise levels will be as much as 10 decibels lower than Stage 3 limits for takeoff, and as much as 5 decibels lower on approach, with additional reductions of more than 3 decibels unlikely. Introduction of newly designed, geared reciprocating engines would provide reductions of 10 or more decibels for high performance single and twin-engined, propeller-driven small airplanes, relative to existing practice. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 580
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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:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1186
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1228
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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
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1000
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