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Description
EN 12354-5 describes methods for predicting noise from technical equipment based on both airborne and structure-borne sound emissions. With respect to structure-borne sound, laboratory methods for source characterisation are specified in EN 15657, providing the necessary input data for prediction models.In particular, for timber constructions, a complete characterisation of the source, including its mobility and the single-equivalent free velocity, is essential for reliable predictions of building-services noise.This paper presents a use case for the structure-borne sound characterization of heat pumps using indirect measurement methods on both high- and low-mobility reception plates.Furthermore, comparisons of source mobility obtained using the two-stage method and the direct measurement method according to EN 15657 are provided.Measurements on high-mobility reception plates require particular attention to mounting conditions, as the static load of the source may influence the results if not properly controlled. A key advantage of indirect measurement methods is the determination of blocked force levels and free velocity levels under realistic installation conditions. This is especially relevant for distributed contact interfaces between the source and the receiving structure, where direct methods are only of limited applicability.