4.3 Application Example: C-Plate Laboratory Test Data with Short Dimension Base Vector The next example of the CSSAMI procedure is performed on the same, circular plate laboratory test object. The FRF data is the same as the previous example and the Polyreference Time Domain (PTD) method is used but only the short dimension vectors are used for every possible pole estimated over a model order range from 2 to 20. This means that the spatial information (base vector of length 7) available for sorting out the consistent solutions will be compromised. 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). 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 15. Complex Mode Indicator Function (CMIF) 415
RkJQdWJsaXNoZXIy MTMzNzEzMQ==