Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.10: Poster
Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer
Real-time vibration monitoring system for the pellet centrifuge at ASDEX Upgrade with empirically derived limit values — •Fin Schmidt1, Bernhard Ploeckl2, Martin Prechtl1, P. T. Lang2, and ASDEX Upgrade team3 — 1Hochschule Coburg — 2Max-Planck-Institut für Plasmaphysik — 3see author list of U. Stroth et al. 2022 Nucl. Fusion 62 042006
The ASDEX Upgrade centrifuge pellet launcher, utilized to reliably control the particle flux and ELM frequency, is now in operation for more than 30 years. The units age as well as its unique design necessitate a real-time vibration monitoring system, to reliably detect, warn and prevent damage or malfunctions. Due to space restrictions, two sensors were affixed close to the lower ball bearing. This configuration allows for an efficient monitoring of both the overall structure and at least one of the two bearings, providing some insight into the stability of the rotor. In the absence of literature and established standards for vibration control specific to this structure and application, the key to find vibrational limits is to derive them empirically. Setting a baseline for limit values considers the current operational values as optimal and establishes more precise limits based on the observed behavior of the unit during different operational states. Advanced tools, such as envelope analysis, are employed to monitor specific machine components, especially the ball bearings. Beyond enhancing the safety of pellet injection at ASDEX Upgrade, the current state of the system includes a scheme to safely shutting down the centrifuge before reaching threatening vibration magnitudes.
Keywords: Vibration monitoring sytem; Limit values; Vibration analysis; Pellet centrifuge