ON THE BENEFITS OF UTILIZING MEASURED INTERFACE FORCES FOR PHYSICAL AND MODAL PARAMETER IDENTIFICATION

In this paper the methods and results of estimating the physical and modal parameters of a liquid propellant tank from base excitation on a six axes shaking table are presented. The measurement of interface forces allows not only the identification of two sets of modal data: one for the fixed/free and the other for the free/free system, but also the identification of all rigid body properties. The high consistency of the two identified parameter sets and the good correlation with analysis results show the benefits of the additional measurement of interface forces.