BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 1 Beam Steering Mirror Sub-System IIDR Overview Ian Pain UK ATC Colin Cunningham, System engineer + BSM consultant David Henry, Optical Engineer, BSM systems assist Brian Stobie, Electronics/Servo engineer Ian Pain,Project Manager + Lead/Mechanical Engineer Tom Paul, Mechanical Design Engineer Ken Wilson, Project Technician Gillian WrightLocal Co-I + Project Scientist Gayle ReynoldsProject Assistant

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 2 Agenda BSM Design drivers The status of the design Open areas Development Plan Qualification Prototyping testing Summary

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 3 BSM design Drivers Stability Specification confirmed & achievable Flex pivots Power consumption vs. vibration survival Launch protection now a baseline –launch damping of motor coils –flex pivot protection sleeves –deployable end stop limits chop travel to +/- 1 degree retract after launch to allow +/- 2.5 degrees motion no Single point Failure ensures spectrometer field of view retained –review following qualification testing

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 4 Re-designed for PACS chopper motors Connectors/Harness and PCAL incorporated. Structure interface complete Design Status PCAL Structure interface Chop Axis

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 5 Design status (continued) Optical Beam interfaces OK Baffle concept design achieved Baffle Beams

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 6 Design status (continued) Electronics Top level design complete –circuit design complete –Deliveries to LAM - tight, but programme rolling ESA procurement requests made –Harness, Thermometers, Connectors specified –BSMe parts - via LAM

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 7 BSM Wiring

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 8 BSM Circuit (10 IC’s, 6 Transistors)

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 9 Open areas - Design Motor selection –Confirm PACS thin or thick motors (torque performance) –Detail Motor packaging & any structural mods –FEA Launch Lock –design & analyse. –Trade off study (cost/complexity vs benefits) Lucas Flexures –determine required pre-ship tests Sensors –instability in test data ID’d. Re-confirm OK. Baffle –confirm interfaces (finish, location, shape) –complete design (ATC+RAL)

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 10 Development Plan

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 11

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 12 Single Axis Prototype –motors & sensors Two Axis Prototype –cooldown, cross talk, manufacture Development Model (DM) –warm shake tests, cold performance Structural & Thermal Model (STM) –SPIRE vibration environment Qualification Model (QM) –survival & life tests, cold performance Cryogenic Qualification Model (CQM) –SPIRE system integration & function Proto-Flight Model (PFM) –flight hardware Flight Spare Model (FSM) –spare Qualification

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 13 Qualification issues STM –to have flex pivots or be fixed mass? –STM vibration delivery too late to work into QM design/build ‘sensibly’. –Will mitigate by procuring backup (stiffer) flex pivots Life tests –Life tests are dominated by ground test (PFM AIV plan TBC needs TBD!) 1.25 x(orbit life) + 4x(ground test duration) / accel factor (1.25 x (4.25x12/6) + (4 x 3) ) / 10= 1.5 months approx. Cold Vibration tests v.costly Long lead items: –flex pivots (Lucas TRW) …. 4-6 months –motors (via MPIA/Zeiss) …. TBD

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 14 Prototype Testing Single axis prototype chopping under closed loop control. –Motors obtained from PACS via MPIA –Laser measurement device delivered (CDL) –D-Space & Simulink environment established closed loop control of prototype –working to characterize actual components and refine control system –alternate (last gasp) prototype delivered (CDL) test dewar commissioned –10-16hr hold time, for prototype tests only –closed cycle cooler dewar will be used for QM

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 15 Single Axis Prototype BSM chop axis PACS motor Tilt Measurement Device

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 16 2-Axis Prototype BSM jiggle frame

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 17 Prototype Test Data

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 18 BSM Motor Tests : Damping with shorted coils

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 19 BSM Motor Tests : Measured Chop Waveform

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 20 BSM Motor Tests : Measured Force Constant

BSMIan Pain, UK ATC SPIRE Instrument Intermediate Design Review April 23, RAL 21 BSM summary Mechanical & Electronic Design in good shape BSM designed at assembly level + 3D components. Interfaces defined –Harness –Structure –Baffle/Optics (concept) –PCAL DDR schedule (Jul.01) –tight but achievable –Motor selection tests critical, but in hand –Deployable end stop at space envelope level only.