Abstract
Visual examination, ultrasonic tests, and dye penetrant inspection, are some examples of nondestructive techniques widely used for crack detection in rotors. These methods have proved to be costly, since satisfactory results rely on detailed and periodic inspections. Significant research effort has been directed in recent years to online monitoring techniques, i.e., based on vibration signals measured during rotor operation. However, most of them are able to only detect deep cracks. The uniqueness of this paper relies on the detection of incipient transverse cracks in rotating shafts by using the so-called, electromechanical impedance method. This method has become a promising tool for structural health monitoring of machines due to its sensitivity to small local damage. Basically, the method monitors changes in the electric impedance of piezoelectric transducers, bonded to (or embedded into) the host structure, through specific mathematic functions, the so-called damage metrics, to detect damage. This is possible because the transducer’s impedance is directly related to the mechanical impedance of the structure. In this context, successful experimental tests were performed in a horizontal rotor supported by roller bearings. PZT patches were bonded along the rotor’s shaft, in which transverse cracks were introduced. The technique was validated under different unbalance conditions.
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Acknowledgments
The authors are thankful to the Brazilian Research Agencies FAPEMIG and CNPq (INCT-EIE) and also to CAPES for the financial support provided for this research effort.
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© 2014 The Society for Experimental Mechanics, Inc.
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Cavalini, A.A., Neto, R.M.F., Steffen, V. (2014). Electromechanical Impedance Based Crack Detection for a Rotating Machine. In: De Clerck, J. (eds) Topics in Modal Analysis I, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-04753-9_4
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DOI: https://doi.org/10.1007/978-3-319-04753-9_4
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