On the drive-point mobility of a periodic rib-stiffened plate

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ConferenceInter-noise 2006: 04 December 2006, Honolulu, USA
Pages110; # of pages: 10
Subjectflanking, model, prediction, impact sound; Vibrations
AbstractFloors in lightweight framed construction typically consist of wood sheathing and a series of joists spaced at a regular interval. The resulting system is a complex periodic orthotropic plate rib structure with point connections. The ability to accurately estimate the power injected by impact sources, and the resulting vibration response of the floor, is critical to being able to predict flanking transmission for sources of structural excitation, such as footfalls, washers, dryers, etc. This paper presents measured and predicted mobilities, and vibration levels, for a point-excited plate-rib system constructed from an isotropic material (Plexiglas). It begins by showing there is significant variation in the drive point mobility. The mobility is shown to be sensitive to the number of ribs on the plate in addition to the distance from the drive point to the nearest ribs. Thus, ordinary mobilities for an infinite plate and beam are inadequate to accurately model the system. An analytical solution for an assembly of finite-sized plate strips coupled at a series of parallel junctions is presented and used to model the plate-rib structure. There is good agreement between measured and predicted results for the drive point mobility as well as the vibration levels.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number45609
NPARC number20377840
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Record identifier1f53c0a2-a70c-4a85-a3ea-2de13035b907
Record created2012-07-24
Record modified2016-05-09
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