Estimation of the injected structure-borne sound power using inversely measured contact forces

In previous work, a method has been proposed to inversely determine the contact forces between an installation and a building element. The ‘installation’ is a vibrating platform used for fitness purposes generating low frequency vertical vibrations. The used transfer functions were measured based on structural-acoustic reciprocity, for which a powerful low-frequency volume sound source was used. The resulting determined forces showed to be accurate if certain conditions are met. In the presented work, the identified forces are multiplied with simultaneously measured velocities to yield an estimate of the injected structure-borne sound power. This quantity is used as input parameter for the standard EN 12354-5 to estimate the acoustic performance of a building based on the performance of building elements, but in that standard it is not explained how to determine this parameter. The estimated injected structure-borne sound power is compared to the power found by other techniques.status: publishe