DocumentCode :
574599
Title :
Modal damping of a quadruple pendulum for advanced gravitational wave detectors
Author :
Shapiro, Brian ; Mavalvala, N. ; Youcef-Toumi, Kamal
Author_Institution :
LIGO Lab., Massachusetts Inst. of Technol., Cambridge, MA, USA
fYear :
2012
fDate :
27-29 June 2012
Firstpage :
1017
Lastpage :
1022
Abstract :
The Laser Interferometer Gravitational-Wave Observatory (LIGO) has begun a major set of upgrades to reach a sensitivity better than 10-19 m/√(Hz) in the 10Hz to 10 kHz frequency band. This advance is expected to bring gravitational wave observations of relativistic astrophysical events such as black hole mergers and supernovae into the realm of regular astronomy. These upgrades require complex vibration isolation systems to better decouple the test masses from ground disturbances. These high performance systems require correspondingly more complex and aggressive active control loops to meet the increased demand in instrument sensitivity. This paper applies a modal damping technique with state estimation to optimize the trade-off between disturbance rejection and sensor noise amplification. The state estimator design applies a customized cost function around the Linear Quadratic Regulator (LQR) algorithm.
Keywords :
damping; gravitational wave detectors; light interferometers; linear quadratic control; pendulums; sensors; state estimation; vibration isolation; LIGO; LQR algorithm; advanced gravitational wave detectors; aggressive active control loops; complex vibration isolation systems; gravitational wave observations; ground disturbances; high performance systems; instrument sensitivity; laser interferometer gravitational-wave observatory; linear quadratic regulator algorithm; modal damping technique; quadruple pendulum; relativistic astrophysical events; sensor noise amplification; state estimation; state estimator design; Actuators; Damping; Mirrors; Noise; Optical interferometry; Resonant frequency; Sensitivity;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
American Control Conference (ACC), 2012
Conference_Location :
Montreal, QC
ISSN :
0743-1619
Print_ISBN :
978-1-4577-1095-7
Electronic_ISBN :
0743-1619
Type :
conf
DOI :
10.1109/ACC.2012.6315185
Filename :
6315185
Link To Document :
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