Abstract
Condition monitoring is vital for operating rotors safely. The application of model-based approaches allows a more detailed diagnosis than signal-based methods. Yet, model-based methods require identifying the properties of the undamaged rotor accurately. Measurements at single parts and modal analysis help to verify the rotor model. When monitoring rotor displacements with eddy-current sensors, also roundness errors must be considered. For roundness identification at operation speed, a method based on three non-orthogonal eddy-current sensors is presented. Several experiments show that the measurement data can be split into the contents rotor orbit and roundness error. The extracted orbit is evaluated by an academic model-based monitoring system developed for our test rig. Currently, it can evaluate unbalance, bow, misalignments and/or stator contact.
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Notes
- 1.
The term “runout” is used ambiguously. In geometric dimensioning and tolerancing, it comprehends roundness and concentricity errors. According to the standardized IFToMM terminology, runout does not include concentricity errors, cf. http://www.iftomm.3me.tudelft.nl/2057_1031/frames.html.
- 2.
In fact, the plot of the 90°-sensor data over the 0°-sensor is not the real orbit (= motion of geometric center) as the data is disturbed by the roundness error.
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Acknowledgments
This research project is supported by the “Deutsche Forschungsgemeinschaft” under grant UL105/37-2.
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Rossner, M., Thuemmel, T., Ulbrich, H. (2015). Online Roundness Error Identification and Model-Based Monitoring for Rotors. In: Sinha, J. (eds) Vibration Engineering and Technology of Machinery. Mechanisms and Machine Science, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-319-09918-7_66
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DOI: https://doi.org/10.1007/978-3-319-09918-7_66
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