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OCULUS - ASR

OCULUS - ASR. Andrew Mauragis Joshua Ehlert Lars Ramseyer. M ICHIGAN T ECHNOLOGICAL U NIVERSITY. SHOT II P OST- L AUNCH J UNE 13, 2010. E XPECTED R ESULTS:.

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OCULUS - ASR

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  1. OCULUS - ASR Andrew MauragisJoshua EhlertLars Ramseyer MICHIGANTECHNOLOGICALUNIVERSITY SHOT II POST-LAUNCH JUNE 13, 2010

  2. EXPECTED RESULTS: • H-bridge temperature increased rapidly during vacuum tests. This mission will test the thermal properties of the H-bridge in low pressure combined with low temperatures (-80 °C).

  3. ACTUAL RESULTS: Mean ΔT: 4.75 °C

  4. OUTCOME: • Partial failure of logging payload • Temperature? • Loose Connection? • Batteries? • Data acquired does not match expected results • In vacuum chamber, component did not reach a steady-state ΔT after 30 minutes • In payload, ΔT established almost instantaneously, at 5 C

  5. ANALYSISAND CONCLUSION: • Cause for discrepancy? • Different vessel size (small insulated box vs open board) • Ambient temperatures vs Box temperature • Requires additional testing: • Consistent ΔT on SHOT payload, but varying on initial vacuum test • Short in actual test magtorquer (not in our simulated one) • Likely heatsink h-bridges to Oculus-ASR structure

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