Measured transfer functions from structure-borne sound sources in a timber-frame construction

Invited paper

Fabian Schöpfer

University of Applied Sciences Rosenheim

Tuesday 2 june, 2015, 14:20 - 14:40

Auditorium 2 (592)

In the frame document for prEN 15657-2 the aim is to provide engineering methods to estimate the structure-borne sound power input from machinery for which the mobility matches or is not much higher than the receiver mobility. This affects most lightweight constructions such as timber-frame buildings. The power input estimated with the proposed methods in prEN <latex>15657\hbox{-}2</latex> serves as input data to predict the structure-borne sound pressure level in a receiving room. To allow comparison of the power input from different structure-borne sound power sources, a single-number descriptor is suggested. This descriptor is represented by the A-weighted sound pressure level in a reference lightweight structure due to the structure-borne sound source. In this paper, diagonal transmission is considered on a T-junction of walls and floors. To obtain the sound pressure level, the equipment is installed fictively on this junction. With knowledge of the transmission function for this construction the structure-borne sound pressure level <i>L</i><sub>sn</sub> can be estimated. <par> To provide the data for a reference transmission function, investigations were carried out in the laboratory as well as in the field. The global transmission function from structure-borne sound power input to a sound pressure level in a remote room was measured for different lightweight construction types. Experimental results are presented showing the variation due to different building configurations and the dependency of the excitation position on the lightweight building element. Conclusions are drawn on the choice for a reference lightweight building configuration.

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