164 M. Piraccini et al. Fig. 15.13 The signal is divided in its positive and negative part in order to compute both the decay rates by means of peaks detection 6 5 4 3 2 1 0 0.4 0.6 0.8 Displacement [mm] Damping ratio from logarithmic decrement:0°-1F-int1 10−3 Damping ratio 1.2 1.4 1 Fig. 15.14 Damping ratio computation as a function of the amplitude of vibration 2 1 0 1.5 0.5 1.5 2 3 4 5 6 2.5 3.5 Time [s] Decay:0°-1F-int1 Displacement [mm] 4.5 5.5 −0.5 −1.5 −1 −2 Fig. 15.15 Displacement decay of the unidirectional blade vibrating at first flexural mode. Decay intensity 1
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