Abstract
The accurate knowledge of the rigid body properties of a structure including the mass, the center of mass location and the moments of inertia is crucial in machine design, vibration analysis, optimization and modeling of mechanical systems. Estimation of these properties through the theoretical methods is difficult when the structure has a complicated shape. Experimentally, the inertia properties of structures can be estimated using the conventional modal testing methods by extracting the rigid body modes. However, all the rigid body modes are not always available, due to the fact that the structure is not excited at the proper degrees of freedom. In Operational Modal Analysis (OMA) the structure can be excited at any point and in different directions. This suggests that the data from OMA is adequate to extract all the rigid body modes of structure. In this paper, a new approach for estimating the rigid body properties of structure using OMA is proposed. The method is applied to the numerical model of a steel beam and the accuracy of results is evaluated. Also a real beam was tested in order to evaluate the performance of method in practice.
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