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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS

Modeling and control of active seismic isolation systems with non-minimum phase zeros for gravitational wave detectors Integration internship

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Bertoglia, Massimo ULiège
Promotor(s) : Collette, Christophe ULiège ; Sacré, Pierre ULiège
Date of defense : 30-Jun-2025/1-Jul-2025 • Permalink : http://hdl.handle.net/2268.2/23300
Details
Title : Modeling and control of active seismic isolation systems with non-minimum phase zeros for gravitational wave detectors Integration internship
Translated title : [fr] Modélisation et commande de systèmes d’isolation sismique active avec zéros non minimum de phase pour les détecteurs d’ondes gravitationnelles
Author : Bertoglia, Massimo ULiège
Date of defense  : 30-Jun-2025/1-Jul-2025
Advisor(s) : Collette, Christophe ULiège
Sacré, Pierre ULiège
Committee's member(s) : Drion, Guillaume ULiège
Kerschen, Gaëtan ULiège
Language : English
Number of pages : 58
Keywords : [en] active isolation
[en] gravitational wave detectors
[en] non-minimum phase zeros
[en] inertial sensors
[en] tilt-horizontal coupling
[en] transfer function
[en] seismic isolation
[en] experimental validation
[en] system dynamics
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Target public : Researchers
Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] This thesis investigates the origin of non-minimum phase zeros in the control of seismic isolation platforms, with a particular focus on gravitational wave detectors such as LIGO, Virgo and Einstein Telescope. These detectors require extreme precision, and even small parasitic dynamic effects can severely impair their sensitivity. Through a combination of analytical modeling, numerical simulations using MATLAB Simscape, and experimental validation, this study explores how the location and configuration of sensors and actuators affect the appearance and nature of transmission zeros. The results highlight the importance of structural geometry in mitigating tilt-horizontal coupling and show that careful sensor placement and mechanical decoupling are essential to achieving effective active control. The findings contribute to improving the robustness and bandwidth of control systems in next-generation detectors, with potential applications in other high-precision engineering systems.


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Author

  • Bertoglia, Massimo ULiège Université de Liège > Master ing. civ. aéro., fin. spéc. aer. eng.

Promotor(s)

Committee's member(s)

  • Drion, Guillaume ULiège Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation
    ORBi View his publications on ORBi
  • Kerschen, Gaëtan ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
    ORBi View his publications on ORBi








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