Measurement-based determination of the irrotational part of the structural intensity by means of test functional series expansion

The irrotational part of the structural intensity for flexural wave motion in plate-like structures is calculated from measurement data of kinematic quantities, such as out-of-plane velocities, by a new method that makes use of a test functional series expansion. The computation of the structural intensity and its irrotational part, which allows to effectively assess vibrational sources and sinks, is less sensitive to measurement noise as compared to standard approaches.