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Free fall test overview
Hanns Selig(ZARM)
F. Liorzou(ONERA)
MICROSCOPE Colloquium II
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CNESS. Leon, M. Bach, A. Robert et al.
ONERAP. Touboul, M. Rodrigues et al.
OCAG. Metris et al.
ZARMC. Lämmerzahl, H. Selig et al.
PTBF. Löffler, D. Hagedorn et al.
MICROSCOPE
Cooperation
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4 MICROSCOPE
Free Fall
Test and
Verification Payload
Modellingand
Simulation
In‐Orbit Calibration
Data Processing
WPs at ZARM
Work Packages at ZARM for MICROSCOPE
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• Project leader: Claus Lämmerzahl
• Project members: - Free fall tests
Hanns SeligMarcus StadtlanderManfred Behrens
- Modelling and mission simulation
Stefanie BremerMeike ListBenny RieversHanns Selig
funded by DLR Agency
MICROSCOPE
The MICROSCOPE-Team at ZARM
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• Standard Capsule / Freeflyer / Catapult
MICROSCOPE
Free fall tests – Drop Tower Facility
Drop Tower facility research areas• Fundamental physics
• Fluid dynamics
• Combustion research
• etc.
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7 MICROSCOPE
Carbon‐Freeflyer
Power supply
Computer
AccelerometerONERA
Radio‐modul
Power supply
Computer
Drop capsule
Free‐Flyer
radio‐moduls
Free fall tests - Freeflyer
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Catapult
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Standard* Freeflyer Catapult CatapultFreeflyer
µg-duration
4.7 s 3.5 stoo short
> 9 s 8 snot yet available
µg-quality 10-6 g 10-8 (-7) g 10-6 g 10-8 g (tbc)
* blocked Freeflyer
Comparison of modes
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10 MICROSCOPE
Free fall tests QM
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11 MICROSCOPE
Free fall tests QM
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ONERA ULTRA SENSITIVE ACCELEROMETERTestability on ground
Their testability on ground requires creating a low gravity environment to verify their functionalities and partially their performances
Ultra sensitive accelerometers are optimised for the in orbit environment
operate within ranges up to 10-6 ms-2
Reach performances of 10-12 ms-2/sqrtHz: heavy test masses
Free fall tests are the only way to obtain such amicrogravity environment that represent space conditions.
Pt/Rh : 1.6kg
Pt/Rh : 0.47kg
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MICROSCOPE SENSOR DEVELOPMENT
•PRE QUALIFICATION TEST=> Several drops in order adjust the parameters to control the Proof
Masses for all axis in the drop tower condition
•REFERENCE DROP
•ENVIRONMENTAL TEST• Vibration test • Thermal vacuum• Shock
•VERIFICATION DROP
•SAME sequence for Flight models
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DROP TEST CONFIGURATION
FEEU:Control voltages boosted to 100V
ICU:Servo Control laws Parameters patchableadjusted for the drop
24 V
Batteries
• A challenge for getting a convergence within 4.7 seconds
• Electrode voltage control boosted from 50V to 100V
• Servo control (PID type) optimized
PXI spyFor data acquisition
• Data acquisitionData, sampled at 1kHz, are acquired by the ICU from the FEEU via one bi-directional RS422 link at 1.25Mbaud. A spy line has been implemented from this link to an acquisition and storage system in order to collect data during the drop.
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Control type implemented for the fall: simulation
DROP SIMULATIONS
• They allow to tune the corrector and optimise it for the test
Position Velocity Acceleration
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Capsule integration: Drop in Y direction
• Optimisation of the capsule balance is a key point in the experiment preparation
=> part of the residualatmospheric drag can betransferred from the fallaxis to axis of thehorizontal plan.
Perturbation minimization• Outside win• Total immobility • Switch off on board
computer fans
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Test result: control of 6x2 degree of freedom of both internal and external mass
X Y
Z
Position and rotation
Accelerations
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Qualification tests: tool for data extension
DROP SIMULATIONS
• They allow to interpret the measured data by extending by calculation, the not yet converged curve to check the trend.
T0 for the simulation Convergence at about 9 seconds
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Conclusion for the free fall test
• Five campaigns, with a total of 50 falls, have been so far conducted in order to provide a better assessment of the dynamical behaviour of the instrument.
• Thanks to this approach, a typical dynamical response, with optimised control laws versus controllers bandwidth and fall duration, has been defined.
• This allows the establishment of qualification and acceptance criteria for the flight models.
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Conclusion for MICROSCOPE mission
The acquisition and control of the 6 degree of freedom of the two cylindrical shape proof masses with significant weight constituting the MICROSCOPE instrument core has been successfully tested for the first time in the BREMEN drop tower.
This success is an important step for MICROSCOPE mission that contributes to the qualification of the instrument by confirming good operations of the twelve electrostatic digital loops in micro gravity and the good reliability and robustness of the configuration.