of length 36) is available for sorting out the consistent solutions. For this case, the following thresholds and control parameters were used: • Lowest order coefficient matrix normalization. • Pole density threshold (4 and above). • Pole weighted vector of model order 10. • Pole weighted MAC threshold (0.8 and above). • Cluster size threshold (4 and above). • Cluster identification threshold (0.8 and above). Figures 1 to 7 represent information used to evaluate the success of the autonomous procedure. These figures are used after the modal parameters have been estimated to assess reasonableness and are not used to guide the procedure. Obviously, when the procedure is complete if modes have been missed or misidentified, adjustments in the control parameters (base vector order and cross MAC thresholds, for example) can be made and the procedure repeated. An experienced user may wish to add or delete modes in a manual interaction as is currently done. Figure 1 is the complex mode indicator function plot which is used to distinguish close or repeated modes. Figures 2 and 3 show the solutions that are remaining after the initial pole surface density threshold and pole weighted vector correlation threshold have been applied. 0 500 1000 1500 2000 2500 10−9 10−8 10−7 10−6 10−5 10−4 10−3 Complex Mode Indicator Function Frequency (Hz) Magnitude Figure 1. Complex Mode Indicator Function (CMIF) 406
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