By Brown E. W.
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Additional info for An Explanation of the Gaps in the Distribution of the Asteroids According to Their Periods of Revolution
12 shows the impedance signatures measured by PZT-D with the rotor balanced (Fig. 12a; refers to Figs. 9) and unbalanced (Fig. 12b; refers to Fig. 11) for the three structural conditions. Comparing the curves, one can observe that the changes found in the impedance signatures with damage are more important for the case in which the rotor is unbalanced. This result is also demonstrated by the damage metrics shown in Figs. 11. A. Cavalini Jr et al. 4 Conclusion The results shown in the present contribution demonstrate the efficiency of the electromechanical impedance method for the detection of incipient cracks in transverse rotating shafts.
In this work three ranges of interest are defined: the quasi-static range, gearbox rigid dynamic range and gearbox flexible range. The gearbox behavior in the first frequency range is completely defined by the quasi-static response of the drivetrain to quasi-static external loading originating from the rotor and the generator. In the second frequency range the rigid body motions of the gearbox and other wind turbine drivetrain components are the main drivers of the drivetrain dynamics. The third frequency range shows highly complex modal behavior.
6 shows the positions of PZT-3 and PZT-D, concerning the damage DAMAGE-1. The second analysis, DAMAGE-2, is a destructive damage. In this case, a saw cut was performed along the shaft crosssection by using a thin machining disc to simulate a crack. This was done about 15 mm from one of the discs (55 mm from PZT-3; region delimited by the discs). 5 mm depth (about 15 % over the shaft diameter), as shown in Fig. 7. 4 Electromechanical Impedance Based Crack Detection for a Rotating Machine Fig. 02 CCD In the analysis of both presented damages, the rotor was kept under 1,200 rev/min.
An Explanation of the Gaps in the Distribution of the Asteroids According to Their Periods of Revolution by Brown E. W.