Design for interaction
Factorized Nyquist based control design applied to a Gravitational Wave detector
Mathyn Van Dael (Nikhef, Eindhoven University of Technology)
Gert Witvoet (TNO, Eindhoven University of Technology)
Bas Swinkels (Nikhef)
Manuel Pinto (European Gravitational Observatory (EGO))
Julia Casanueva (European Gravitational Observatory (EGO))
Diego Bersanetti (Istituto Nazionale di Fisica Nucleare - Sezione di Genova)
Maddalena Mantovani (Istituto Nazionale di Fisica Nucleare - Sezione di Genova)
Marco Vardaro (Nikhef)
Tom Oomen (Eindhoven University of Technology, TU Delft - Mechanical Engineering)
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Abstract
Gravitational Wave detectors require feedback control to control the length between the sensitive components of the detector. The degrees of freedom in the control system are inherently coupled and the level of interaction furthermore varies over time. A systematic control design approach for the feedback controllers is presented which provides a guide on how to cope with the varying levels of interaction. A new controller for one of the loops has been designed and experimental results measured on the Gravitational Wave detector Advanced Virgo show a significant reduction in the root mean square error of the loop with the new controller.
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