Applicability of the structure-borne sound source characterisation Two-Stage method as well as the parameters derived in sound pressure level predictions in lightweight constructions

When predicting structure-borne sound-induced sound pressure levels, in addition to describing the sound propagation path through the building structure as exactly as possible, it is necessary to charac-terise the vibration behaviour of the structure-borne sound sources. The investigations described here were carried out to extend the applicability of the structure-borne sound source characterisation two -stage method described in EN 15657 and to describe its uncertainties. Furthermore, the suitability of the structure-borne sound parameters determined with TSM in the sound pressure level prediction according to EN 12354-5 was tested and statements on the achievable accuracy were derived. For both methods -characterisation of structure-borne noise sources and prediction of structure-borne noise -induced sound pressure levels -data on prediction accuracy are only available to a very limited extent but are essential for a reliable prediction model.Firstly, different sources of structure-borne sound were characterised using the two-stage method on different reception plates. In the process, structure-borne sound sources with defined acting moments were also investigated to analyse their influence on characterisability. Using the characterised vibration parameters of the structure-borne sound sources, the power introduced into different reception plates was then calculated and compared with measurements to establish the achievable accuracy of the char-acterisation method.Subsequently, the investigated structure-borne sound sources were installed in a lightweight test stand and the resulting sound pressure levels were measured in an adjacent receiving room. These were com-pared with the sound pressure levels predicted according to EN 12354-5 to obtain reliable statements on the achievable accuracy when using source quantities determined using TSM in the normatively described prediction procedure for structure-borne sound-induced sound pressure levels. A mean devi-ation between predicted and measured sound pressure levels of approx. 7 dB could be determined across all investigated sources.(c) 2023 Elsevier Ltd. All rights reserved.

Automated summary

In order to predict structure-borne sound-induced sound pressure levels, it is necessary to accurately describe the sound propagation path through the building structure and characterize the vibration behavior of the structure-borne sound sources. This study aims to extend the applicability of the two-stage method for characterizing structure-borne sound sources and to determine its uncertainties. The suitability of using the structure-borne sound parameters determined with TSM in the prediction of sound pressure levels was tested and the achievable accuracy was assessed.