The dynamic behaviour of heavy, horizontal axis, rotating shaft-lines affected by transverse cracks can be analysed in the frequency domain by a quasi linear approach, using a simplified breathing crack model applied to a traditional finite element model of the shaft-line. This allows to perform a series of analyses with affordable efforts. The analysis of the modelling procedure allows to define an approximated approach for simulating the dynamical behaviour, which allows to predict the severity of the crack excited vibrations, combined to modal analysis. this answers to the old-age question on how deep a crack must be to be detected by means of vibration measurements. The model of a 320 MW turbo-generator group has been used to perform a numerical sensitivity analysis, in which the vibrations of the shaft-line, and more in detail the vibrations of the shafts in correspondence to the bearings, have been calculated for all possible positions of the crack along the shaftline and for two different values of the depth of the crack. The calculated results confirm the predicted behaviour.
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ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis
July 7–9, 2008
Haifa, Israel
Conference Sponsors:
- International
ISBN:
978-0-7918-4838-8
PROCEEDINGS PAPER
Rotating Shafts Affected by Transverse Cracks: A Sensitivity Analysis
Nicolo` Bachschmid,
Nicolo` Bachschmid
Politecnico di Milano, Milano, Italy
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Ezio Tanzi,
Ezio Tanzi
Politecnico di Milano, Milano, Italy
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Paolo Pennacchi
Paolo Pennacchi
Politecnico di Milano, Milano, Italy
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Nicolo` Bachschmid
Politecnico di Milano, Milano, Italy
Ezio Tanzi
Politecnico di Milano, Milano, Italy
Paolo Pennacchi
Politecnico di Milano, Milano, Italy
Paper No:
ESDA2008-59481, pp. 53-60; 8 pages
Published Online:
July 6, 2009
Citation
Bachschmid, N, Tanzi, E, & Pennacchi, P. "Rotating Shafts Affected by Transverse Cracks: A Sensitivity Analysis." Proceedings of the ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. Volume 4: Fatigue and Fracture; Fluids Engineering; Heat Transfer; Mechatronics; Micro and Nano Technology; Optical Engineering; Robotics; Systems Engineering; Industrial Applications. Haifa, Israel. July 7–9, 2008. pp. 53-60. ASME. https://doi.org/10.1115/ESDA2008-59481
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