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Flight Data Review and Error Analysis - TA Activation #2

Detailed analysis of simulated science observations during Flight #2, with focus on stability improvements, control deviations, and overall image quality assessment. Activation of gate valve and secondary mirror mechanism is discussed, along with lessons learned for flight optimization.

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Flight Data Review and Error Analysis - TA Activation #2

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  1. TA Activation Flight #2(took place on Jan 15, 2010) “Quick Look” Data Review Thomas Keilig, 661-276-2011, keilig@dsi.uni-stuttgart.de

  2. Card 21: Simulated Science Observations Legs SOFIA left the R-2508 complex to the south, crossed LAX airspace in >41 kft and turned around at Santa Catalina Island: - Flight Path up to Card 20 - Simulated Science Legs - Turn in between - Descent/Approach KPMD

  3. Card 21: Simulated Science Observations Legs increased cumulative error which can be attributed to data dropouts • increased altitude of Card 21 (43 kft) compared to Card 13 (35 kft) • hence a more stable environment leads to smaller control deviations • the additional control deviation around 0.2 Hz can be attributed to data errors • close to ES requirement, but also a few points for improvements identified • ES requirement for overall Image Quality is 5.3 arcsec (D80%) in the optical

  4. Card 11: Gate Valve activation Cross section through Flange Assembly (FLA): Bypass valve Nasmyth Tube(cavity pressure) INF tub SI Flange with SI Mass Dummy installed

  5. Card 11: Gate Valve activation Closures of Bypass Valve to measure the remaining differential pressure < 30 mbar • Operated via TA pass-through command • Bypass Valve was auto-cycled 7 times before pressure between INF tub and TA Cavity was < 30 mbar (precondition for Gate Valve opening)

  6. Card 22: Secondary Mirror activation via TAOC Tilt Chop Mechanism (TCM) Test: • waveform identical as on ground • higher noise identified as the 300 Hz oscillation New SMM controller (without low pass filter) optimized on ground is not robust enough to handle in flight closed door vibration levels. Low pass filter can be implemented easily as successfully demonstrated during HIPO Line Ops Lessons Learned:  Not everything that performs like expected on ground does so in flight

  7. Summary of TA Activation Flight #2 • Successful in flight demonstration: • performance of repaired gyro unit (inertial stabilization) • VIS caging, uncaging and x-centering at different altitudes • x-centering: 9:10 min to 4:30 min (100 psi to 50 psi) • caging: 3:20 min to 2:20 min (200 psi to 140 psi) • VIS auto center mode handles cabin pressure changes • air consumption ~70 psi per hour • coupled mode: coarse and fine drive together in inertial_stab • First time in flight activation: • Filter Fan Unit • Nasmyth Tube Fans • Gate Valve opend and closed • Fine Balancing Drives • Characterized TA stability in inertial stabilization mode • Characterized Secondary Mirror chopping operation cold soak • Characterized WFI and FFI: cold, and in flight noise level

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