The comparison with EI technique, based on the maximization of the independence of modal properties, demonstrates that the proposed methodology is an effective tool to minimize model ill-conditioning in dynamic condensation techniques and to define the number of sensors required and their location in experimental modal identifications. In particular, MoGeSeC provides a more distributed sensor placement that increases the modal shape rebuilt accuracy even with low sensor number. 2 4 6 8 10 2 4 6 8 10 0 20 40 60 80 100 EMA EI EMA EI 0 10 20 30 40 50 60 70 80 90 100 2 4 6 8 10 2 4 6 8 10 0 20 40 60 80 100 FEA EMA 0 10 20 30 40 50 60 70 80 90 100 Figure 10 – MAC matrix (orthogonality property) Figure 11 – MAC matrix between FEM modes and of EI modes for the crankshaft component. EI modes for the crankshaft component. Figure 12 – Comparison of the first 7 crankshaft mode shapes between FE model and EI reduced modes. 291
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