On the importance of the direct field in structure borne transmission in framed constructions

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ConferenceProceedings of Forum Acusticum 2005: 29 August 2005, Budapest, Hungary
Pages16; # of pages: 6
Subjectflanking, model, prediction, impact sound, direct field; Flanking; Floors
AbstractThis paper reports findings from a recently completed study of sound transmission in wood framed buildings. The paper begins by showing that the impact sound insulation of floor flanking paths is strongly dependent on the distance from the flanking junction and that adding a topping to the floor modifies the sensitivity to source location. Vibration draw-away measures on the exposed floor surface are used to demonstrate the attenuation of structure borne vibration is different in the directions parallel and perpendicular to the joists, and the attenuation with distance can be significantly modified by the presence of a topping. These vibration measures and the change in Flanking-NISPL with source position indicate that diffuse field assumptions are not valid and suggest that some form of a direct field controls the incident structure borne power. It is also shown that vibration draw-away measures (made on the exposed surface of the floor) can be used to accurately predict the change in Flanking-NISPL with source location. These data are used to explain why the effectiveness of floor toppings to control floor-flanking paths is a function of joist orientation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number48143
NPARC number20377857
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Record identifier71a4a43b-e14d-4ac1-9d74-4605b8582e3b
Record created2012-07-24
Record modified2016-05-09
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