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Influence of Real Atmospheric Conditions on Free Propagation of Aircraft Noise

Binder, Uta and Isermann, Ullrich and Schmid, Rainer (2013) Influence of Real Atmospheric Conditions on Free Propagation of Aircraft Noise. Acta acustica united with Acustica, 99 (2), pp. 192-200. Hirtzel. DOI: 10.3813/AAA.918602 ISSN 1610-1928

Full text not available from this repository.

Official URL: http://dx.doi.org/10.3813/AAA.918602

Abstract

The propagation of sound in the atmosphere is influenced by meteorological conditions. During computation a detailed description of meteorological conditions takes a lot of time but principally the needed meteorological data are not available in most cases. That is why the sound propagation calculation of common tools, like the German AzB or the Integrated Noise Model, is based on standardised meteorological conditions. The main objective of this study is to quantify the noise level differences between common propagation and propagation considering real weather conditions. Therefore the two important sound propagation effects for free sound propagation (atmospheric attenuation and geometrical spreading) are investigated for sources in higher altitudes. A ray-tracing algorithm is used to model the refractions of sound due to wind, wind gradients, and temperature gradients. The atmospheric attenuation is calculated by ISO 9613-1. The used meteorological conditions based on the parameters, i.e. temperature, wind, and relative humidity, from one year radiosonde measurements taken at the meteorological observatory Lindenberg in Germany. All in all, for long-term periods all these calculated average sound pressure levels and the levels calculated for standardised atmospheric conditions are similar in size. Furthermore, common noise calculations overestimate the meteorological influence on sound propagation slightly.

Item URL in elib:https://elib.dlr.de/64673/
Document Type:Article
Title:Influence of Real Atmospheric Conditions on Free Propagation of Aircraft Noise
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Binder, Utauta.binder (at) dlr.deUNSPECIFIED
Isermann, Ullrichullrich.isermann (at) dlr.deUNSPECIFIED
Schmid, Rainerrainer.schmid (at) dlr.deUNSPECIFIED
Date:2013
Journal or Publication Title:Acta acustica united with Acustica
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:99
DOI :10.3813/AAA.918602
Page Range:pp. 192-200
Publisher:Hirtzel
ISSN:1610-1928
Status:Published
Keywords:meteorological influence, aircraftnoise prediction procedures, free soundpropagation outdoors, sound immission, atmospheric absorption, geometric spreading, refraction, raytracing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:23 Jun 2014 10:48
Last Modified:06 Sep 2019 15:23

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