Active platforms; Control schemes; Digital control; Feedforward cancellation; Ground vibration; Inertial sensor; Non-linear response; Piezo actuator; Six degrees of freedom; Test bed; Physics and Astronomy (miscellaneous)
Abstract :
[en] We demonstrate the control scheme of an active platform with a six degree of freedom (6D) seismometer. The inertial sensor simultaneously measures translational and tilt degrees of freedom of the platform and does not require any additional sensors for the stabilization. We show that a feedforward cancelation scheme can efficiently decouple tilt-to-horizontal coupling of the seismometer in the digital control scheme. We stabilize the platform in the frequency band from 250 mHz up to 10 Hz in the translational (X, Y) degrees of freedom and achieve a suppression factor of 100 around 1 Hz. Further suppression of ground vibrations was limited by the non-linear response of the piezo actuators of the platform and by its limited range (5 μm). In this paper, we discuss the 6D seismometer, its control scheme, and the limitations of the test bed.
Disciplines :
Physics
Author, co-author :
Ubhi, Amit Singh ; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Prokhorov, Leonid ; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Cooper, Sam ; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Di Fronzo, Chiara ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Bryant, John; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Hoyland, David; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Mitchell, Alexandra ; Department of Physics and Astronomy, VU Amsterdam, Amsterdam, Netherlands ; Dutch National Institute for Subatomic Physics, Nikhef, Amsterdam, Netherlands
Van Dongen, Jesse ; Department of Physics and Astronomy, VU Amsterdam, Amsterdam, Netherlands ; Dutch National Institute for Subatomic Physics, Nikhef, Amsterdam, Netherlands
Mow-Lowry, Conor ; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom ; Department of Physics and Astronomy, VU Amsterdam, Amsterdam, Netherlands ; Dutch National Institute for Subatomic Physics, Nikhef, Amsterdam, Netherlands
Cumming, Alan ; Institute for Gravitational Wave Research, School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
Hammond, Giles ; Institute for Gravitational Wave Research, School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
Martynov, Denis ; Institute for Gravitational Wave Astronomy, School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
Language :
English
Title :
Active platform stabilization with a 6D seismometer
STFC - Science and Technology Facilities Council EU - European Union
Funding text :
We thank Rich Mittleman for his valuable internal review and also members of the LIGO SWG groups for useful discussions. The authors acknowledge the support of the Institute for Gravitational Wave Astronomy at the University of Birmingham, STFC 2018 Equipment Call ST/S002154/1, STFC “Astrophysics at the University of Birmingham” under Grant No. ST/S000305/1, and STFC QTFP “Quantum-enhanced interferometry for new physics” under Grant No. ST/T006609/1. A.S.U. is supported by STFC studentship Nos. 2117289 and 2116965. A.M. contributed in the design of the coil magnet actuation scheme for damping of the test mass. A.M., J.V.D., and C.M.L. are funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 865816).
