Theoretical and experimental study of a generalized pseudoforces method for source characterization

摘要

So-called pseudo- or substitution forces on the outside of a source body can be used to characterize the strength of compact structure-borne sound sources. Their use allows for multi-directional vibrations, whilst the measurement effort remains limited. However, the indirect nature of the method introduces some arbitrariness in substitution forces locations. This leads to the existence of equivalent but different sets of appropriate pseudo-forces. In the current work the theory and the practical validity are studied of a transformation of pseudo-forces into modal loads. This procedure would allow for an unambiguous definition of 'equivalent forces', increasing the practical exploitation possibilities of the method. At the same time the measurement effort needed for the characterization is kept limited. The validity and practicability of this new technique is tested by experiments on a compact source.