Author: John P. RaneyPublisher:
ISBN:
Category : Airplane sounds
Languages : en
Pages : 24
Book Description
Noise Prediction Technology for CTOL Aircraft
Author: John P. RaneyPublisher:
ISBN:
Category : Airplane sounds
Languages : en
Pages : 24
Book Description
Research Needs in Aircraft Noise Prediction
Author: John P. RaneyFederal Aircraft Noise Research, Development and Demonstration Programs: FY73-FY75
Author: Interagency Aircraft Noise Research PanelPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 236
Book Description
CTOL Transport Technology, 1978
Author: CTOL Transport Technology, 1978
Author: Open Rotor Noise Prediction at NASA Langley - Capabilities, Research and Development
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781793923035
Category : Science
Languages : en
Pages : 32
Book Description
The high fuel prices of recent years have caused the operating cost of the airlines to soar. In an effort to bring down the fuel consumption, the major aircraft engine manufacturers are now taking a fresh look at open rotors for the propulsion of future airliners. Open rotors, also known as propfans or unducted fans, can offer up to 30 per cent improvement in efficiency compared to high bypass engines of 1980 vintage currently in use in most civilian aircraft. NASA Langley researchers have contributed significantly to the development of aeroacoustic technology of open rotors. This report discusses the current noise prediction technology at Langley and reviews the input data requirements, strengths and limitations of each method as well as the associated problems in need of attention by the researchers. We present a brief history of research on the aeroacoustics of rotating blade machinery at Langley Research Center. We then discuss the available noise prediction codes for open rotors developed at NASA Langley and their capabilities. In particular, we present the two useful formulations used for the computation of noise from subsonic and supersonic surfaces. Here we discuss the open rotor noise prediction codes ASSPIN and one based on Ffowcs Williams-Hawkings equation with penetrable data surface (FW - Hpds). The scattering of sound from surfaces near the rotor are calculated using the fast scattering code (FSC) which is also discussed in this report. Plans for further improvements of these codes are given. Farassat, Fereidoun Langley Research Center WBS:561581.02.08.07.18.03
NASA Reference Publication
Author: Prediction Method for Lateral Attenuation of Airplane Noise During Takeoff and Landing
Author: A-21 Aircraft Noise Measurement Aviation Emission ModelingPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
This document has been determined to contain basic and stable technology which is not dynamic in nature.
Scientific and Technical Aerospace Reports
Author: Aircraft Noise
Author: Oleksandr ZaporozhetsPublisher: CRC Press
ISBN: 0203888820
Category : Technology & Engineering
Languages : en
Pages : 432
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