Errors when using façade measurements of incident aircraft noise

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ConferenceInter-Noise 2002: 19 August 2002, Dearborn, MI., U.S.A.
Pages18; # of pages: 8
Subjectsound insulation, aircraft noise, façade microphones, sound transmission loss; Aircraft noise
AbstractThis paper considers the problem of measuring incident aircraft noise when validating predictions of indoor aircraft noise levels from free-field outdoor levels such as those obtained from airport noise level contours. Both ASTM E966 and ISO 140/V indicate that the incident outdoor noise for measurements of the sound insulation of building facades can be obtained using microphones positioned at the building façade. Measurements of the incident aircraft noise at the façade and in the free field indicate that this can lead to large differences from simple expectations. This paper presents the results of measurements of aircraft passbys showing the variations in the incident sound levels as a function of the aircraft elevation. These were related to the effects of diffraction from the building façade as well as to the effects of ground reflections. This interpretation was confirmed both mathematically and using a scale model façade in an anechoic room. It was concluded that more general and easier to interpret estimates of incident sound levels can be obtained from free field measurements than from façade-mounted microphone measurements.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number45384
NPARC number20378728
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Record identifier8065ec2b-9231-429c-8a29-bbc37909a3e4
Record created2012-07-24
Record modified2016-05-09
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