New Methodologies for the Thermal Modelling of CubeSats

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1 New Methodologies for the ling of CubeSats Philipp Reiss 15 August 2012 Small Satellites Conference Logan (Utah), USA

2 Why do we need Thermal Analysis for CubeSats? 2

3 Thermal characteristics of CubeSats. Few space-qualified components > Narrow operational temperature range. Highly integrated electronics > High internal heat loads. Surface covered with solar panels > Given surface properites (thermal control). Low Earth Orbit > High number of thermal cycles. Limited attitude control > Limited pointing variation (thermal control) Image: TUM/LRT 3

4 How can we perform Thermal Analysis for CubeSats? 4

5 Thermal Software Conventional What if... CubeSat-specific Is designed for conventional larger s/c Specialized on CubeSat configurations Requires experience and practise Easy to use Requires expensive licenses Freely available Images: universetoday.com, leifiphysik.de, spiralhosting.com, TUM/LRT, theeuropean.de, n/ 5

6 Thermal Software What if... CubeSat-specific This work: Development of the CubeSat-specific thermal analysis tool Specialized on CubeSat configurations Easy to use Freely available Images: TUM/LRT, theeuropean.de, n/ 6

7 General Concept Create Compute Radiation Solve. Geometry. Discretisation. Material properties. Boundary conditions. Conductive couplings. View factors. External radiation. Internal radiation Temperatures 7

8 General Concept Create Compute Radiation Solve. Geometry. Discretisation. Material properties. Boundary conditions. Conductive couplings. View factors. External radiation. Internal radiation Temperatures 8

9 CubeSat approach Image: ClydeSpace Ltd. 9

10 CubeSat approach Images: ClydeSpace Ltd. 10

11 CubeSat approach Submodel Database Images: ClydeSpace Ltd. 11

12 Implementation 12

13 Modelling process 1 Select components from database 2 Specify nodes being in thermal contact 3 Assign boundary conditions A Q B Images: ClydeSpace Ltd. 13

14 Heat exchange factors. Internal heat exchange factors pre-defined > Non-geometric nodes [c p,m]. External heat exchange factors auto-generated > Radiative contact nodes [c p,m, A, α, ε] > Conductive contact nodes [c p,m, A, x, k] Images: ClydeSpace Ltd. 14

15 Advantages. Modular thermal model with reusable submodels [database]. Individual submodels [independent from final configuration]. Direct definition of internal thermal couplings [estimates/measurements]. Automatic computation of external thermal couplings 15

16 General Concept Create Compute Radiation Solve. Geometry. Discretisation. Material properties. Boundary conditions. Conductive couplings. View factors. External radiation. Internal radiation Temperatures 16

17 Radiation Module View Factor View factor to Earth Monte Carlo ray-tracing View factor to Sun Analytical determination Internal view factor Approximation 17

18 Tool Features. Implemented in MATLAB. Offers a step-by-step guide. Modular modelling with database components. Radiation module. User defines:.. boundary conditions.. satellite attitude.. simulation parameters. Post-Processing & plot features 18

19 Validation Benchmark with ESATAN TMS. Example satellite with 108 nodes. Polar Low Earth Orbit. 360 steps per orbit. Results compared to ESATAN TMS: > Relative error for radiative case results <12% > Absolute error for steady state temperatures max -0.16/+0.04K > Computation time for one orbit 87% faster 19

20 Initial Requirements Specialized on CubeSat configurations? Easy to use? Freely available? Component database Individual modelling Easy model setup Step by step guide Open source Anyone can extend the component database Images: TUM/LRT, theeuropean.de, n/a 20

21 Thank you! New Methodologies for the ling of CubeSats Philipp Reiss 7 June

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