Prediction of noise caused by structure-borne sound sources

摘要

In buildings, more and more service equipment is used to fulfil requirements on low energy demand and thermal comfort. However, technical equipment can be annoying, while producing noise. A prediction and calculation of sound power introduced into the structure is necessary. ISO 15712 and EN 12354 specify how to calculate the sound pressure level by analyzing the energetic role of all relevant transmission paths. However, this calculation is rather complex and is only applicable for homogenous building structures. For lightweight constructions with highly inhomogeneous structures, empirical values and examples of constructions have to be used to determine the sound pressure. The method of the present investigation is different. It focuses on the characterization of the source by using the two-stage reception plate method (TSM). Two parameter, the source mobility and the free velocity, are necessary to characterize sources. Experiments have proven that the user-friendly two-stage reception plate method is suited for a good structure-borne sound power prediction. Results on measurements in a lab and on buildings are presented.