358 Q. Guo et al. Fig. 35.5 The beam test-bed and test equipments Frequency Response Function [172.25, -7.88e-001] [405.00, -5.27e+001] [172.25, 6.05e+000] [405.00, -1.12e+001] 180 90 0 -90 -180 180 90 0 -90 -180 -41.5 -33.5 -25.5 -17.5 -9.5 -1.5 6.5 30 20 10 0 -10 -20 -30 -40 0 50 100 150 200 250 300 350 400 450 0 50 100 150 200 250 300 350 400 450 0 50 100 150 200 250 300 350 400 450 0 50 100 150 200 Hz Hz 250 300 350 400 450 [49.00, 1.86e+001] [405.00, 1.15e+001] [49.00, 4.91e+000] [405.00, -2.05e+001] Phase(deg) dB Mag Phase(deg) dB Mag Frequency Response Function Fig. 35.6 The FRF for free end (left) and for rubber springs (right) Table 35.1 Modal frequency errors of the cantilever beam with one fixed end EMA FEM ModeNo. Freq (Hz) Damp (%) Freq (Hz) Error (Hz) Errors coefficient A 1 59.07 0.9 59.26 0.19 1.0032 2 174.61 1.0 172.10 2.51 0.9856
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