Interface mobilities have been demonstrated useful quantities in conjunction with the analysis of vibration transmission at multiple point and large area interfaces. The extension of the approach to the related area of source characterisation is logical. Thereby significant conceptual as well as practical simplifications result. The interface mobilities which are the ratios of the spatially Fourier decomposed velocity field to excitation field components, thus retain the formal simplicity and transparency of the single point case. This is at the expense of a slightly more elaborate post-processing of the constituent, computational or experimental data. Herein, the approach is critically examined for a source-receiver configuration, involving multiple contact points. Particular interest is directed to the case where both subsystems have matched or close to matched dynamic characteristics.
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