since last update in MDI AJeremie ABadel BCaron RLeBreton JLottin JAllibe GBalik JPBaud LBrunetti GDeleglise QD0 stabilisation update since ID: 410352
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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.DelegliseSlide2
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-docSlide3
What has been doneCharacterize the stabilisation systemDevelop a model for the componentsDevelop control loops
First test on set-upMDI December 16, 20113Slide4
Correction schemeMDI December 16, 2011
4Input 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 systemSlide5
Phase 1 : Stabilisation system behaviour
10
0
10
1
10
2
10
3
10
4
-10
0
10
20
30
40
50
Gain dB
10
0
10
1
10
2
10
3
10
4
-1500
-1000
-500
0
Phase
Intrinsic 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.
MDI December 16, 2011
5
Frequency (Hz)Slide6
Model for the componentsMDI December 16, 2011
6
Frequency (Hz)Sensor
Mechanics
Global systemSlide7
MDI December 16, 2011
7Test conditions
Capacitive sensors used for setting-up the systemFeedback loop with accelerometers: one on “ground” other on top of system
No mass on systemTo maximize signal for test:Excitation: high frequency “hammer hit” (so high frequency range)Cut “low-frequency” range from testSlide8
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)
Magnitude FFT Transmission (en dB)
Fonction de Transfert en transmission
Open
loop
Closed
loop
Simulation
with
closed
loop
MDI December 16, 2011
8Slide9
Next stepsOther feedback loops are available that work well in simulation, but need to better understand some “low-frequency” experimental problems encountered
Characterize sensor in more detailExcite with “ground motion” instead of hammerAdd QD0 dummy massMDI December 16, 20119URGENT!Slide10
Enjoy the Holliday season!
MDI December 16, 201110