Scientific conference in universities or research centers (Scientific conferences in universities or research centers)
Sample Stabilization For Tomography Experiments In Presence Of Large Plant Uncertainty
Dehaeze, Thomas; Magnin-Mattenet, Muriel; Collette, Christophe
2018
 

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Keywords :
control; tomography; hexapod
Abstract :
[en] A new low emittance lattice storage ring is under construction at the ESRF. In this new instrument, an upgraded end station for ID31 beamline must allow to position the samples along complex trajectories with a nanometer precision. In order to reach these requirements, samples have to be mounted on high precision stages, combining a capability of large stroke, spin motion, and active rejection of disturbances. First, the end station will be presented with the associated requirements. However, the precision is limited by thermal expansion and various imperfections that are not actively compensated. Our approach is to add a Nano Active Stabilization System (NASS) which is composed of a 6DoF Stewart platform and a 6 DoF metrology system. A 3D model of the end station updated with experimental data is developed. As the mass of the samples may vary by up to two orders of magnitudes, robust control strategies are required to address such plant uncertainty. The proposed control strategy are presented and applied on the developed model by conducting time domain simulations of tomography experiment in presence of instrumentation noise and system uncertainty.
Disciplines :
Mechanical engineering
Electrical & electronics engineering
Author, co-author :
Dehaeze, Thomas ;  Université de Liège - ULiège > Form. doct. sc. ingé. & techno. (aéro. & mécan. - Paysage)
Magnin-Mattenet, Muriel
Collette, Christophe  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Active aerospace struct. and adv. mecha. systems
Language :
English
Title :
Sample Stabilization For Tomography Experiments In Presence Of Large Plant Uncertainty
Publication date :
27 June 2018
Number of pages :
4
Event name :
Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (10th)
Event place :
Paris, France
Event date :
from 25-06-2018 to 29-06-2018
Audience :
International
Available on ORBi :
since 19 January 2019

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