8 A New Measure of Shape Difference 79 Fig. 8.13 SDI for modal frequency shapes Fig. 8.14 SDI for modal damping shapes Each table contains five shapes, one for each torque value. Each shape contains six components, each component containing either a modal frequency or damping value. The SDI bar chart values shown in Fig. 8.13 were calculated between all frequency shape pairs in Fig. 8.11. Likewise, the SDI bar chart values shown in Fig. 8.14 were calculated between all pairs of shapes in Fig. 8.12. The SDI values in Fig. 8.13 indicate a significant difference in modal frequencies caused by the five different torque values. However, the SDI values in Fig. 8.14 indicatevery little differencein modal damping values between the five different torque values.
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