Floor excitation with the heavy soft impact source

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ConferenceForum Acusticum 2011: 27 June 2011, Aalborg, Denmark
Pages16; # of pages: 6
Subjectimpact sound, rubber ball, sound insulation, blocked force; Office acoustics
AbstractLow frequency impact sound is one of the most common reasons for complaints by buildingoccupants. Therefore, some countries, Japan and Korea, have introduced heavy soft impactsources into their standards ? the ?tire? and the ?rubber ball? - that effectively excite lowfrequency sound. Both are dropped from a specified height on the floor under test. Although theball was introduced more recently, it seems to be more accepted by engineers in the field becauseof the ease of handling. In previous studies, to better understand the floor excitation by the ball, asimple analytical model that does not account for modal ball deflection was applied to predict itsblocked force. Good agreement between prediction and measurement was found in the lowfrequency range, however, the analytical model grossly underestimated the blocked force in themid and high frequency range. In this paper the finite element method is applied to predict themodal deformation of the ball during impact on the floor. The results of this numerical study helpsto better understand discrepancies found in earlier publications between the analytic ball modeland measurement. Conclusions for the improvement of the analytical model are finally drawn.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number54012
NPARC number20373767
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Record identifier5a41c11f-f704-4ccd-a4bc-bbd2dc72f7db
Record created2012-07-23
Record modified2016-05-09
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