PREDICTION METHOD FOR LATERAL ATTENUATION OF AIRPLANE NOISE DURING TAKEOFF AND LANDING PDF Download
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Author: A-21 Aircraft Noise Measurement Aviation Emission Modeling
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: A-21 Aircraft Noise Measurement Aviation Emission Modeling
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Society of automotive engineers
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: A-21 Aircraft Noise Measurement Aviation Emission Modeling
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This document describes analytical methods for calculating the attenuation of the level of the sound propagating from an airplane to locations on the ground and to the side of the flight path of an airplane during ground roll, climbout after liftoff, and landing operations. Both level and non-level ground scenarios may be modeled using these methods, however application is only directly applicable to terrain without significant undulations, which may cause multiple reflections and/or multiple shielding effects. This attenuation is termed lateral attenuation and is in excess of the attenuation from wave divergence and atmospheric absorption.The methods for calculating the lateral attenuation of the sound apply to: turbofan-powered transport-category airplanes with engines mounted at the rear of the fuselage (on the sides of the fuselage or in the center of the fuselage as well as on the sides) or under the wings propeller-driven transport-category or general-aviation airplanes propagation over ground surfaces that may be considered to be "acoustically soft" such as lawn or field grass situations where the terrain to the sides of the flight paths is not necessarily flat with receiver locations that are elevated above or depressed below the corresponding point on the ground under a flight path flight paths that include turns such that the airplane is banked.The calculation methods do not apply for calculation of lateral attenuation for: propagation over ground surfaces that are considered to be "acoustically hard" such as frozen or compacted soil, ice, or water propagation over ground surfaces that contain many large structures, extensive forests, and similar objects propagation over ground surfaces with significant undulating terrain the sound produced by helicopters.Helicopters are highly directional sources. While the specific method described herein is not wholly applicable to the prediction of lateral attenuation of helicopter noise, some components (see 6.1) may be applicable.Relationships presented herein were derived utilizing data from microphones placed 1.2 m above the local ground surface. The relationships may be appropriate for use at receivers at other heights, however care should be taken in such applications. AIR5662 has been reaffirmed to comply with the SAE five-year review policy.
Author: Society of Automotive Engineers. A-21 Committee on Aircraft Noise
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 42
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Author: Oleksandr Zaporozhets
Publisher: CRC Press
ISBN: 0415240662
Category : Technology & Engineering
Languages : en
Pages : 435
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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 skilled and knowledgeable engineers. This book is for them. It shows you how accurate and reliable information about aircraft noise levels can be gained by calculations using appropriate generation and propagation models, or by measurements with effective monitoring systems. It also explains how to allow for atmospheric conditions, natural and artificial topography as well as detailing necessary measurement techniques.
Author: Society of automotive engineers
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Author:
Publisher:
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Category : Science
Languages : en
Pages : 36
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Author: Harvey H. Hubbard
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 452
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Author: John P. Raney
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 46
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Author: John K. Molloy
Publisher:
ISBN:
Category : Supersonic transport planes
Languages : en
Pages : 34
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