Paul TurinFIELDS iPDR – TRL6 1 SPP-FIELDS TRL 6 Testing Paul Turin [email protected].
GoetzFIELDS iPDR – I&T SPP/FIELDS Integration and Test Preliminary Design Review Keith Goetz...
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Transcript of GoetzFIELDS iPDR – I&T SPP/FIELDS Integration and Test Preliminary Design Review Keith Goetz...
![Page 1: GoetzFIELDS iPDR – I&T SPP/FIELDS Integration and Test Preliminary Design Review Keith Goetz University of Minnesota Goetz@umn.edu 1.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc75503460f94abbc44/html5/thumbnails/1.jpg)
Goetz 1FIELDS iPDR – I&T
SPP/FIELDSIntegration and Test
Preliminary Design Review
Keith Goetz
University of Minnesota
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Goetz 2FIELDS iPDR – I&T
FIELDS Block Diagram
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Goetz 3FIELDS iPDR – I&T
Interface Control Documents
• Spacecraft to FIELDS– General Instrument ICD is at rev dash (7434-9066)– FIELDS Specific ICD (7434-9055)
• Minor open issues don’t preclude ETU development
• MOC-SOC ICD– Well developed and familiar from RBSP and STEREO
• FIELDS to SWEAP ICD (SPF_MEP_105_SWEAP_ICD)– Preliminary release signed on both sides
• Subsystem ICDs are well along– MEP, CDI, RFS, TDS, DFB, MAG, AEB, LNPS, PA, SCM
• Connectors and pin-outs (SPF_MEP_110_Connectors) well defined
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Goetz 4FIELDS iPDR – I&T
Requirements Verification
• Verify Instrument Requirements per IRD– Meet/Verify Quality Requirements per QA Matrix (7434-9096)– Meet/Verify Contamination Requirements per CCP (SPF_SMA_003)– Verify Environmental Requirements per ERTRD (7434-9039)– Verify EMC Requirements per EMECP (7434-9040)– Verify Spacecraft Interface Requirements per GI ICD (7434-9066)– Verify Spacecraft Interface Requirements per FIELDS ICD (7434-9055)– Verify SWEAP Interface Requirements per FIELDS-SWEAP ICD
(SPF_MEP_105)– Verify Performance Requirements per FIELDS IRD (SPF_SYS_010)
• Approach Described in FIELDS Verification, Validation, Test, and Calibration Plan (SPF_IAT_002)
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Goetz 5FIELDS iPDR – I&T
I&T Plans
• Philosophy– Requirements are verified as early as possible at a low level
• Verifies subsystems, Retires risk– Requirements are verified at the highest level of assembly possible
• Often involves verifying a requirement at several levels– Maintain flexibility in test sequencing to maintain schedule
• Tests on ETU and Flight Units– Subset of tests on ETU to qualify the design where practical and
possible– Full tests on Flight units
• Typical Test Levels:– Subassembly (circuit board): functional– Component (e.g. V1, MAG, SCM, MEP): functional, mass properties,
vibration, TV, deployments, magnetics– Instrument: functional, calibration, interface, EMC, TV
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Goetz 6FIELDS iPDR – I&T
Environmental Test Matrix
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Goetz 7FIELDS iPDR – I&T
Planned ETU I&T Flow
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Goetz 8FIELDS iPDR – I&T
Planned FM I&T Flow
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Goetz 9FIELDS iPDR – I&T
Validation
• All instrument requirements are captured in IRD– IRD contains columns detailing how and where the requirement is met
• IRD doubles as verification cross reference matrix
• Systems Engineer is responsible for verifying test procedures meet requirements and responsible for verifying that all requirements are met by following test plan
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Goetz 10FIELDS iPDR – I&T
Procedures
• Each test will be documented by a Test Procedure– Test procedure shall identify IRD requirements to be verified by the test– Test procedure shall include pass/fail criteria– System Engineer, QA, Subsystem lead to sign off on procedure before use– System Engineer, QA to sign off on completed as-run procedure– QA to ensure Red-lines to be transferred into procedure before next use
• Each completed test to be documented by a Test Report– ETU and subassembly test reports may be a combination of the as-run
procedure and lab notebook– System Engineer to sign off on test reports, and determine if test adequately
verifies associated requirements• Discrepancies found during tests to be documented in a Problem
Failure Report (PFR)– Starting with first functional tests at FM subassembly level– Includes any problem (including software) not immediately identified as a test
setup or operator problem which cannot stress the flight article– QA will track PFRs to closure with concurrence of the Failure Review Board
(includes APL)
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Goetz 11FIELDS iPDR – I&T
Calibrations
• Co-I hardware institutions will deliver fully calibrated sub-assemblies
• Once FIELDS instrument is fully integrated– Several verification cals in ambient and at temperature– Timing– SWEAP
• Antennas – as mechanical elements – can be tested separately
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Goetz 12FIELDS iPDR – I&T
Interfaces
• Interface tests verify interfaces meet requirements from ICD and/or specifications.
• FIELDS ETU to be tested with APL S/C mini emulators• FIELDS FM to be tested with APL S/C emulators• FIELDS TDS ETU/FM to tested with SWEAP (at UCB)• At other times (prior to Observatory I&T) interfaces simulated with
GSE – Board, Component level tests performed with
• Board Interface Simulation GSE– Instrument-level tests performed with:
• APL-provided spacecraft emulator• Command and Telemetry GSE software• Stimulation GSE or internal test signal• SWEAP simulator (FIG)• Deployment actuator simulators
– GSE functionality, design described in GSE section
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Goetz 13FIELDS iPDR – I&T
Mechanical Testing
• Antenna mechanisms can be tested independently of electronics
• Full functional testing• Vibration• TV• Where appropriate, testing will include whips
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Goetz 14FIELDS iPDR – I&T
Thermal Testing
• Tests per SPP Environmental Spec– 1 survival and 6 operational thermal vacuum cycles– Temperature ranges detailed in thermal presentation
• Per FIELDS V&V and T&C plan– V1-V4 PAs in one range– V5 PA in one range– MAG sensors (at GSFC)– SCM assembly (at LPC2E)– MEP is the simplest
• Includes all sensors– Antenna mechanisms
• Proposed Thermal Balance test using ETU FIELDS boom and ETU sensors
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Goetz 15FIELDS iPDR – I&T
EMC Tests
• Tests per EMECP
• Deep Dielectric Discharge Test– Interfaces Only for MEP (Shielded)– All points on sensors outside S/C body
• DC Magnetics (sniff test)– ETU and Flight Units, Component level
• Target Is <10nT DC at outer most sensor on MAG boom• Results of sniff test reported to Magnetics Working Group for analysis and
possible mitigations• Test to be performed by APL personnel
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Goetz 16FIELDS iPDR – I&T
EMC Tests
• Surface Charging / Electrostatic Cleanliness– Measure resistance between exposed surfaces
• Requirement <105 ohms per square to chassis ground– Some surfaces may be covered with thermal blankets
• blanket testing needs to be done at Observatory level• repeated late in the flow
• Ground Bonding and Isolation– Chassis bonding
• < 2.5 milliohms between adjacent chassis elements• < 5 milliohms box to chassis
– Ground Isolation• >1Mohm primary to secondary (chassis) ground
– Measured at Instrument-level EMC testing• ETU and FM
• Turn On/Off Transients– In-rush and transient current profile limits per EMECP document– Measure in-rush current and transient profile at Instrument-level EMC
• ETU and FM• CE, CS, RE, RS Tests as detailed in EMECP.
– ETU will only do CE measurements on the bench
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Goetz 17FIELDS iPDR – I&T
Contamination
• FIELDS Contamination Control Plan documents how FIELDS will meet Project contamination control requirements
• The only significant FIELDS contamination sensitivity is the antenna surfaces– Will be in storage through most of I&T– Special handling procedures apply when antennas are exposed
• No purge requirement at any point• Instrument I&T will be in Class 100,000 facility at UCB
– Subassemblies / Components delivered to I&T will be inspected and cleaned as needed prior to integration into components
– When Instrument is not in a Class 100,000 environment the unit will be bagged• Flight units will be baked out per FIELDS bakeout plan prior to delivery to APL
– Vacuum bakeout at max survival temp for at least 48 hours with TQCM
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Goetz 18FIELDS iPDR – I&T
S/C-level I&T
• FIELDS and APL have had preliminary discussions w/r/t S/C level I&T
• FIELDS integration will involve a number of elements (~20)
• FIELDS magnetic sensors will have protective enclosures• FIELDS will have external stimulus to support CPT functional testing
• Antennas will not be deployed at Spacecraft level– Too hard to implement off-load GSE at spacecraft level– First motion without whips
• Actuator simulators will be provided to perform simulated boom deployments– simulators contain flight-like resetable actuators (or equivalent loads)– simulators attach to S/C deployment harnessing– Simulators can be used at spacecraft-level TV
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Goetz 19FIELDS iPDR – I&T
FIELDS Flight Configuration
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Goetz 20FIELDS iPDR – I&T
FIELDS CPT Configuration
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Goetz 21FIELDS iPDR – I&T
Conclusion
• Requirements are understood• Instrument I&T plans are taking shape
– Previous experience helps• Spacecraft I&T plans are just getting started
– Previous experience helps here too
• FIELDS is ready to move into ETU development