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Investigation of Control Approaches for a High Precision, Piezo-Actuated Rotational Stage
Linköping University, Department of Electrical Engineering, Automatic Control.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Equipment Controls and Electronics section (EN-STI-ECE) at CERN is developing a high precision piezo-actuated rotational stage for the UA9 crystal collimation project. This collaboration is investigating how tiny bent crystals can help to steer particle beams used in modern hadron colliders such as the Large Hadron Collider (LHC). Particles are deflected by following the crystal planar channels, "channeling" through the crystal. For high energy particles the angular acceptance for channeling is very low, demanding for a high angular precision mechanism, i.e. the rotational stage. Several control-related issues arising from the complexity and operational environment of the system make it difficult to design a controller that achieves the desired performance. This thesis investigates different control approaches that could be used to improve the tracking capability of the rotational stage. It shows that the IRC method could be used to efficiently control the rotational stage. Moreover it shows that a harmonic cancellation method could be used to increase the tracking accuracy by canceling known harmonic disturbances. The harmonic cancellation method (the RFDC) was implemented in this thesis and proposed as an add-on to the present control algorithm.

Place, publisher, year, edition, pages
2016. , 85 p.
Keyword [en]
Rotational stage, Piezoelectric actuator, Integral resonance control, Adaptive control, External disturbance rejection, Harmonic cancellation
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-131449ISRN: LiTH-ISY-EX--16/4994--SEOAI: oai:DiVA.org:liu-131449DiVA: diva2:972421
External cooperation
CERN
Subject / course
Automatic Control
Presentation
2016-09-08, Algoritmen, 15:15 (English)
Supervisors
Examiners
Available from: 2016-09-21 Created: 2016-09-20 Last updated: 2016-09-21Bibliographically approved

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Ericson, Niklas
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