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ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
Free fall payload test environment and mission simulation
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Drop Tower Bremen
• Free flyer concept
µg-quality
• Catapult system
µg-quality
• MICROSCOPE test configuration baseline
• Mission simulation
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
Drop Tower Bremen
1g 0g 45g
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
)()( tFmgtma drag )()( tFmgtma drag
mg
FdragAir drag - air friction
22 )(2
)()( tvcAtvtF wNewton
Centrifugal acceleration2 rac
0 .00 0 .05 0 .1 0 0 .1 5 0 .2010 -10
1 0 -9
1 0 -8
1 0 -7
1 0 -6
d is tance to sp inaxis
0 .01m 0 .05m 0 .10m 0 .20m 0 .30m
a z [ms-2
] (=
2 r)
S p in ra te [°/s ]
Vibrationpayload (fans, harddisks, etc.),transition 1g-0g
vibration damping, no vibrating payload components!
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Drop Tower Bremen
• Free flyer concept
µg-quality
• Catapult system
µg-quality
• MICROSCOPE test configuration baseline
• Mission simulation
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
Power supply
Computer
Accelerometer ONERA
Accelerometer
ZARM
Radio link
Power supply
Computer
Drop capsule
Free-Flyer
Radio link
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
1 10 100 10001E-9
1E-8
1E-7
1E-6
1E-5
1E-4
1E-3
drop 2011-03-17_1blocked freeflyer, blocked damping system, capsule computer fan off 1s before drop
AccX (vert.) AccY AccZ
ms-2
Hz-1
/2
Hz
1 10 100 10001E-9
1E-8
1E-7
1E-6
1E-5
1E-4
1E-3
drop 2011-03-18_1unblocked freeflyer, blocked lower damping system, unblocked upper damping system, capsule computer fan off 15s before drop
AccX (vert.) AccY AccZ
ms-2
Hz-1
/2
Hz
Free flyer+ vibration damping
Standard Capsule
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Drop Tower Bremen
• Free flyer concept
µg-quality
• Catapult system
µg-quality
• MICROSCOPE test configuration baseline
• Mission simulation
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
The ZARM Catapult system
-1 0 1 2 3 4 5 6 7 8 9 10-0,0005
-0,0004
-0,0003
-0,0002
-0,0001
0,0000
0,0001
0,0002
0,0003
0,0004
0,0005
AccX measured AccX simulated
22.01.2008 Vp=40V
AccY
,Z,X
/ms-2
Time/s
22 )(2
)()( tvcAtvtF wNewton
Acce
lera
tion
/ms-
2
10 100 100010-9
10-8
10-7
10-6
10-5
10-4
10-3
Acc (horizontal) Free-Flyer Acc (horizontal) Katapult
Hz
ms-2
Hz-1
/2
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
Stanard drop Free-flyer
Standard drop Catapult shot
µg duration 2-3 s 4 s 7-8 s
present µg-level 10-7 - 10-8g 10-5 - 10-6g 10-5 - 10-6g (10-7 g around apex)
advantage
disadvantage
best µg-level
short experiment time
low spin rates
lower µg-level
long experiment time
lower µg-levelhigher spin rates
better for High-Resolution-ModeHRM
better for Full-Range-ModeFRM
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Drop Tower Bremen
• Free flyer concept
µg-quality
• Catapult system
µg-quality
• MICROSCOPE test configuration baseline
• Mission simulation
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Pre qualification tests SU QM2 : 2011Several drops in order adjust the parameters
• Qualification tests SU QM2 : 2011Qualification purpose: drop before and after environmental tests
• Functionnal tests SU FM : 2011/2012control the PM for all axis
• Test SU FM : 2011/2012Flight configuration
Test configuration baseline
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
• Drop Tower Bremen
• Free flyer concept
µg-quality
• Catapult system
µg-quality
• MICROSCOPE test configuration baseline
• Mission simulation
19.09.2011 | Paris
1
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Processing of MICROSCOPE data – data reduction methods
High performance satellite dynamics simulation tool
• Comprehensive simulation of the real system including the science signal and error sources
• By means of mission simulations data is generated to test the reduction and processing methods
19.09.2011 | Paris
2
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
19.09.2011 | Paris
3
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
19.09.2011 | Paris
4
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Models of Earth Gravity Field: Simple Gravity Model (spherical potential including zonal
harmonic coefficients Jn up to degree n is approximated)
Higher order Gravity Model: Spherical harmonic model of
the Earth's gravitational potential (complete to degree and
order 360, based on GRACE data: EGM2008, EIGEN-5C,GGM03)
all effects of the Earth's non-symmetric mass
distribution can be described
Higher order Gravity Model: Method of Pines (based on
Grace data, zero-tide system: includes permanent tidal
deformation due to external bodies)
19.09.2011 | Paris
5
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Earth Magnetic Field: The International Geomagnetic Reference Field (IGRF-11)
External magnetic field: Tsyganenko Model• Internal magnetic field (IGRF-11)• Distortion of the internal magnetic field in high altitudes
because of the solar wind
• Ephemerides: Sun, the planets and Pluto
Based on the algorithm of Montenbruck & Pfleger
better: JPL ephemeris (based on n-body-calculations of approx.
300 solar system objects including the PPN of GR)
19.09.2011 | Paris
6
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Atmospheric Density: Empirical model for the atmosphere extending from the
ground to the exosphere (NRLMSISE-00):
• associated with the NRLMSIS data base
• models the temperatures and densities of the atmosphere's
components
HWM93 atmospheric wind Models
Model of Harries-Priester
• based on the properties
of the upper atmosphere
as determined from the
solution of the heat
conduction equation
under quasi hydrostatic
conditions
19.09.2011 | Paris
7
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Eclipse Model
• Solar Pressure Model: Point-like source
Finite disk source
• Albedo Irradiance Model: Reflectivity data taken from
• Total Ozone Mapping Spectrometer (TOMS):
22. July 1996 – 14. December 2005• Aura Mission: 1. January 2005 - 30. June 2009• Monthly mean data sets can be used (generated from TOMS
data)
19.09.2011 | Paris
8
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Transformations
19.09.2011 | Paris
9
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Transformations
19.09.2011 | Paris
10
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Surface Forces:Calculation of surface forces and resulting torques by means of
Finite Elements
Dependence of the disturbance force on the geometry of
satellite
• Space Debris:Under Construction!!!
Uses data obtained with the help of ESA-tool MASTER
(Meteoroid and Space Debris Terrestrial Environment
Reference)
19.09.2011 | Paris
11
Testing the Equivalence Principle from a Basis of General Relativity to a Key to Quantum Gravity
Center of Applied Space Technology and Microgravity
• Test mass and satellite dynamics
• Noise Model of MICROSCOPE instrument
Noise model and filter estimation with simulated noise sampled at 1000 Hz for 100s
ONERA Palaiseau - 19.9.2011 H. Selig / M. List funded by DLR-Agency
“Simulation” team at ZARM
Stefanie BremerMeike ListBenny RieversHanns Selig
Free fall test team at ZARM
Manfred BehrensHanns SeligMarcus Stadtlander
Students
Patrick NtsanaSebastian Hinck
Project Leader
Claus Lämmerzahl