1. A method for characterisation of vibrational and/or acoustic transfer path related data of a physical system, the physical system comprising at least one input point and at least one response point, the method comprising receiving in-situ input data for at least one input point and/or response data for at least one response point of the physical system receiving at least one system response function between the at least one input point and the at least one response point, and applying at least one parametric model characterising at least one load on the physical system as a function of said input data, whereby the parametric models are estimated from said input data and/or response data and said physical system response functions.