MOVE2 Solar Panel Analysis

Model Material: CFRP Properties: E_x=132525MPa, E_y=8440MPa, G_xy=4700MPa, G_yz=3150MPa, G_xz=4700MPa, rho=1.5e-9t/mm^3 Solar Cells: GaAs, E=1MPa (negligible), rho=5.31e-9t/mm^3 Measurements: l_panel=210mm, h_panel=80mm, t_CFRP=0.2, t_solarcell=0.2 Hinges 5mm at x=50mm and x=160mm Mechanism 5mm in middle of panel side Layup: solar cell over entire panel, 7 CFRP layers, 0,45,-45,0,45,-45,0 Simulation in ANSYS 12.1

Mesh and Boundary Conditions

Layup Plot

20g static load, z Deformation

Modal Analysis Modular frequencies: All frequencies are well above the range of harmonic oscillations on Dnepr (which are at 2-20Hz) SET TIME/FREQ 1 113.15 2 140.95 3 327.90 4 383.46 5 403.13 6 611.08 7 686.17 8 775.92 9 850.14 10 1073.0

Modal Analysis-Modular Forms

Comparison: 4 layer, 1mm CFRP under 20g static load

Preliminary random vibration analysis Power spectral density according to Dnepr user manual http://snebulos.mit.edu/projects/crm/DNEPR/Dnepr_User_Guide.pdf Calculation according to http://ansys.net/ansys/tips/week23-random_vibrations_tow.pdf Problem: Damping factor is unknown -> testing and iteration necessary (can be done in cooperation with LLB) Most important result: Panel corner deformation should stay below 0.746mm for 99.7% of the time (3 sigma)

3 sigma displacement plot

PSD response diagram

Conclusion Use of a single Hold-down/release mechanism seems viable for a panel thickness of ~1.5mm A 1mm panel will likely be too thin Shock analysis will be done in ANSYS at LLB at a later date (not critical for REXUS)