qd0 stabilisation update (since last update in mdi) a.jeremie a.badel, b.caron, r.lebreton,...
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![Page 1: QD0 stabilisation update (since last update in MDI) A.Jeremie A.Badel, B.Caron, R.LeBreton, J.Lottin, J.Allibe, G.Balik, J.P.Baud, L.Brunetti, G.Deleglise](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d9e5503460f94a87cfd/html5/thumbnails/1.jpg)
QD0 stabilisation update(since last update in MDI)
A.JeremieA.Badel, B.Caron, R.LeBreton, J.Lottin,
J.Allibe, G.Balik, J.P.Baud, L.Brunetti, G.Deleglise
![Page 2: QD0 stabilisation update (since last update in MDI) A.Jeremie A.Badel, B.Caron, R.LeBreton, J.Lottin, J.Allibe, G.Balik, J.P.Baud, L.Brunetti, G.Deleglise](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d9e5503460f94a87cfd/html5/thumbnails/2.jpg)
QD0 stabilisation update(since last update in MDI)
A.JeremieA.Badel, B.Caron, R.LeBreton, J.Lottin,
J.Allibe, G.Balik, J.P.Baud, L.Brunetti, G.Deleglise
Got a permanent position at LAPP
New EuCARD post-doc
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What has been done
• Characterize the stabilisation system• Develop a model for the components• Develop control loops• First test on set-up
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Correction scheme
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Input noise External sensor
Sensor noise Controller
Dynamical model of system
++ +
+
In order to optimize the controller, we need to get the maximum of information on the components in the system
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Phase 1 : Stabilisation system behaviour
100
101
102
103
104-10
01020304050
Gain dB
100
101
102
103
104
-1500
-1000
-500
0
PhaseIntrinsic resonances if change of phase by 90°: other peaks just from boundary conditions => 2 resonance peaks just below 2kHz and near 4kHz.
First intrinsic resonance frequency near 2kHz : experimental and theoretical values agree.
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Frequency (Hz)
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Model for the components
MDI December 16, 2011 6Frequency (Hz)
Sensor
Mechanics
Global system
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Test conditions
Capacitive sensors used for setting-up the systemFeedback loop with accelerometers: one on “ground” other on top of systemNo mass on systemTo maximize signal for test:
Excitation: high frequency “hammer hit” (so high frequency range)Cut “low-frequency” range from test
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Control testratio of transfer functions
0 100 200 300 400 500 600 700 800 900 1000-25
-20
-15
-10
-5
0
5
10
15
Fréquence (en Hz)
Ma
gn
itu
de
FF
T T
ran
sm
iss
ion
(e
n d
B)
Fonction de Transfert en transmission
Open loop
Closed loop
Simulation with closed loop
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Next steps
• Other feedback loops are available that work well in simulation, but need to better understand some “low-frequency” experimental problems encountered
• Characterize sensor in more detail• Excite with “ground motion” instead of
hammer• Add QD0 dummy mass
MDI December 16, 2011 9
UR
GE
NT
!
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• Enjoy the Holliday season!
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