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					        GLAST LAT Project                              Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                      Agenda: LAT Environmental Test TIM, Day 1: Structural

•      Introduction  8:30 – 8:45

•      Morning Planning Meeting  8:45 – 12:00
        – Sine Vibration Test Planning Meeting  8:45 – 10:15
        – Acoustic Test Planning Meeting  10:30 – 12:00

•      Lunch  12:00 – 1:00

•      Facility Tour  1:00 – 3:15
        – Acoustic Test Planning  1:00 – 1:45
        – Sine Vibration Test Planning  1:45 – 2:45
        – Mass Properties Planning  2:45 – 3:15

•      Afternoon Planning Meeting  3:30 – 5:30
        – Mass Properties Summary  3:30 – 3:45
        – Sine Vibration Summary  3:45 – 4:15
        – Acoustic Test Summary  4:15 – 4:45
        – Action Item Review  4:45 – 5:30




    LAT-TD-00000-02                                                                                          Page 1
        GLAST LAT Project                            Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                               Agenda: Morning Planning Meeting


•      Sine Vibration Test Planning Meeting  8:45 – 12:00
        – Action Item List Status (JK)  8:45 – 9:00
        – Status of the Test Plan (JK)  9:00 – 9:15
        – Detailed Test Sequence and Current Test Configuration (JK)  9:15 – 10:00
        – Other Logistics (All)  10:00 – 10:15

•      Break  10:15 – 10:30

•      Acoustic Test Planning Meeting  10:30 – 12:00
        – Action Item List Status (JK)  10:30 – 10:45
        – Status of the Test Plan (JK)  10:45 – 11:00
        – Detailed Test Sequence and Current Test Configuration (JK)  11:00 – 11:45
        – Other Logistics (All)  11:45 – 12:00




    LAT-TD-00000-02                                                                                        Page 2
            GLAST LAT Project                                                                             Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                            Sine Vibration Test Planning: Updated Action Item Status

        Dynamics Test Action Item List                                                                          Test Director: John Ku
        Acoustic, Vibe, Mass Properties                                                                               Updated:     18-Feb-05
                                                                                                                        Printed:   18-Mar-05
Total Actions: 47                                                                                         Open Actions:    26
  ID      Test                           Action Item                                      Actionee              ECD      Status           Status Comments/Disposition/Conclusions
 V100     VIBE Add strain Gages on S/C flexures. Additional instrumentation for      John Ku               1/2/2005      Open      Added extra accel's to Instr Plan. Strain Gauge locations
                box level qual.                                                                            2/15/2005               defined. Need to add strain gauges to Instr Plan.
                                                                                                           3/25/2005
 V101    VIBE Confirm working clearance to rotate the shaker. Add this working Bill Raynor                 3/15/2005     Closed    Walk through at NRL meeting in mid-March. Determined that
              envelope to facility CAD layout                                                                                      the LAT will have to be moved to second slip table when
                                                                                                                                   shaker is rotated from vertical to horizontal.
 V102    VIBE Provide CAD file of vibe table: size and bolt pattern for slip table   Paul Dizon             2/28/2005    Open*     Will be redrawn at NRL and provided to SLAC. An
              and expander head.                                                                                                   unreleased draft has been provided, but need drawing to be
                                                                                                                                   signed off.
 V103    VIBE Review of interfaces to identify peak loads at box interfaces that John Ku                    10/15/2004   Closed    12/6 Coordinated with drawing release schedule. 1/18/05
              have not been tested compare to predictions. May need to update                               11/1/2004              Closed to ET 2-23 with update of the instrumentation plan and
              the instrumention plan.                                                                       1/15/2005              vibe plan with current instrumentation. Provide NRL with
                                                                                                                                   current Instrumentation Plan from Leonard Lee.
 V104    VIBE Investigate data collection system at SLAC for accel. test during      John Ku                4/15/2005    Closed    Three step verification recommended: 1) When accels arrive
              installation. Define instrumentation checkout process for I&T.                                                       in-house, use a 1g hand-held shaker to verify sensitivity; 2)
                                                                                                                                   after installation, tap check for signal; 3) touch check to
                                                                                                                                   ensure position (touch check will isolate the accel)
 V105    VIBE Can NRL table manage the change in the sweep rate for sine vibe Michael Lovellette            10/15/2004   Closed    Yes the sweep rate be changed. Per e-mail from M. Lovellette
                                                                                                                                   10/21/04
 V106    VIBE Evaluate if .15g low level input is sufficiently above the noise floor Michael Lovellette     10/15/2004   Closed    NRL input is this is okay. NRL has gone lower with the old
              or is higher input required.                                                                  12/15/2004             system. Per e-mail from M. Lovellette 10/21/04

 V107    VIBE Calibration interval on accels                                         Michael Lovellette     10/15/2004   Closed Incremental change is very slow. Low frequency excitation to
                                                                                                                                determine functional. Per e-mail from M. Lovellette 10/21/04

 V108    VIBE Muon survey, electrical function, dimensional inspection after each Pat Hascall            11/30/2004       Open
              axis to determine if there is a performance change?                                        12/17/2004
                                                                                                         2/28/05
 V109    VIBE Can we waive the slow sweep rate and pick it up at Observatory         Paul Baird          10/8/2004       Closed Not necessary because NRL can accommodate the sweep
                                                                                                         10/31/2004             rate change. Decision was made to keep spectrum as is.
 V110    VIBE Spacecraft interface definition from Spectrum Astro.                   Paul Baird          10/31/2004      Open* Testing done at S/A in early December. Need S/C interface
                                                                                     Mark Melton     Tim 4/1/2005               template for match drilling at SLAC in February. See Attached
                                                                                     Morse                                      Response from P. Baird 1/27/05. Need detailed info from SAI
                                                                                                                                for drilling. Get LAT and Flexure placement procedure from
                                                                                                                                SAI.



      LAT-TD-00000-02                                                                                                                                                             Page 3
            GLAST LAT Project                                                                        Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                     Sine Vibration Test Planning: Updated Action Item Status (cont)

        Dynamics Test Action Item List                                                                     Test Director: John Ku
        Acoustic, Vibe, Mass Properties                                                                          Updated: 18-Feb-05
                                                                                                                   Printed: 18-Mar-05
Total Actions: 47                                                                                    Open Actions:    26
  ID      Test                               Action Item                                Actionee          ECD       Status         Status Comments/Disposition/Conclusions
 V111     VIBE Need to develop the plan for calibration of ACD accel already        Leonard Lee                     Closed Will use Low level signature to check accel calibration
                installed
 V112     VIBE Determine criteria by which modal survey decision is made            John Ku            7/15/2005      Open 2/15: opened at Plan Mtg. Criteria will be known after pre-test
                during/after sine vibe                                                                                     analysis is completed
 V113     VIBE Can harnesses stay mated during sine vibe to save mate/de-mate       Rich Bielawski     4/15/2005      Open 2/15: opened at Plan Mtg. Requirement if left on for vibe?
                cycles?
 V114     VIBE Generate CAD layout of vibe facililty, incl room, entrance, crane,   Paul Dizon         3/7/2005      Open* 2/15: opened at Plan Mtg. First cut 2d drawing sent out.
                tables                                                                                                     Need to send out final drawings
 V115     VIBE Work out specifics of integrating LAT on flexures and vibe adapter   Martin Nordby      3/15/2005     Open* 2/15: opened at Plan Mtg. Cf V110
                plate, plus transporting with it on
 V116     VIBE Identify cooling needed for vibe LPT's, and whether Chill Bars can   John Ku            3/15/2005      Open 2/15: opened at Plan Mtg
                stay attached to wings                                              Martin Nordby
 V117     VIBE Identify cleanliness req's for LAT during vibe, since lab is not a   Martin Nordby      4/15/2005      Open 2/15: opened at Plan Mtg. Not clear we need anything yet, but
                clean room                                                                                                 the provision for tent is there
 V118     VIBE Work through vibing a pressurized component with NRL safety          John Ku            7/15/2005      Open 2/15: opened at Plan Mtg. HP's are pressurized components:
                                                                                    Marc Campell                           How much gas is in each HP and what is the pressure level?
                                                                                    Bob Haynes




      LAT-TD-00000-02                                                                                                                                                       Page 4
        GLAST LAT Project                                          Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                              Sine Vibration Test Planning: Test Plan Status

•      Objectives of the test are well understood by all
        – Verify the strength of the LAT and subsystem interfaces under PFQ loads and durations
        – Measure primary natural frequencies (fn) of the primary modes of the LAT
        – Determine transmissibility (Q) of the LAT
        – Validate the math model used for coupled loads analysis
        – Verify the workmanship and processes used in the manufacture and assembly
•      Test Plan
        – Many technical details have been addressed in previous meeting, and just need to be
            collected and summarized – many of these points will be raised today, and agreements
            made will go directly into plan
        – Instrumentation list is nearing completion, but not finished yet
               •      Internal accelerometers defined and CAD layout complete
               •      External accelerometer mathematical positions defined, but CAD layout needed
               •      Strain gauges (12 channels) on flexures expected, but not defined yet (NRL can accommodate up
                      to 40 channels, ¼ bridge)
         –   Entrance/Exit criteria are well understood by all
               •      No failure or damage to the LAT assembly as determined by physical inspection
               •      No significant changes to the dynamic signature as determined by the pre and post low-level sine
                      vibration inputs
               •      No significant degradation of instrument or system performance




    LAT-TD-00000-02                                                                                                      Page 5
        GLAST LAT Project                                 Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                        Sine Vibration Test Planning: Test Plan Status (cont.)

•      Test Personnel
        – Test support personnel have been identified (to be verified)
               •      Test Director: John Ku (SLAC)
               •      Test Conductor: Bob Haynes (NRL)
               •      Discipline Lead: Jim Haughton (NRL)
               •      Facility Manager:Bill Raynor (NRL)
               •      MGSE Lead: Martin Nordby (SLAC)
               •      EGSE Lead: Mike Huffer (SLAC)
               •      Test Script Lead: Rich Baun (SLAC)
               •      High-bay operations: Paul Dizon (NRL)
               •      Quality Assurance: Darren Marsh (or Doug Bartholomew) (SLAC)
               •      I&T: Ken Fouts (SLAC)
         – Subcommittees will be assembled from the appropriate personnel above, with
           expert consultation brought in if needed
               • Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile




    LAT-TD-00000-02                                                                                             Page 6
        GLAST LAT Project                              Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                      Sine Vibration Test Planning: Test Plan Status (cont.)

•      Test Requirements
        – Instrument Verification Plan
               • The tests will be performed to the levels published in the LAT environmental
                 specification document, LAT-SS-00778
               • The dynamics tests are to be performed in the mode in which the equipment will
                 observe the environment
                   – LAT will be launched in a “powered off” mode
                   – The sine vibration tests will be performed with the article powered off
         – EGSE Constraints
               • Cables
                   – If harnesses are heavy, they should be disconnected during vibration
                   – Must be long enough to reach LAT while mounted to either expander head or
                      slip table
                   – Cable trays or protection if laid on floor
               • Cart with EGSE Hardware
                   – Portable, can be rolled out of the way
                   – Power interface to lab?




    LAT-TD-00000-02                                                                                          Page 7
        GLAST LAT Project                                          Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                        Sine Vibration Test Planning: Test Plan Status (cont.)

•      Test Requirements
        – MGSE Constraints
               •      Test Interface Plate
                         – Accommodates Spectrum-specified flexure mounting procedures
                         – Should not have any modes less than 225 Hz (1.5 X 150 Hz)
                         – Should be one order of magnitude stiffer than the flexures
                         – Mass should be small enough to not significantly impact Z-axis test
                         – Light enough to allow for using GPR to lift LAT+TIP within its current rated load (3000 kg)
                         – CG should be in-line with LAT and should position LAT CG through each drive axis
                         – Sufficient strength to carry all test loads with margin
                         – Interface with NRL slip table and expander head
               •      Cable support structures
                         – Should allow free motion of cables between vibration equipment and ground
                         – Should be grounded well to prevent tipping
                         – Allow access to vibe equipment, connector panels, blankets and externally mounted
                             accelerometers
               •      Test stand / handling dolly
                         – Should be grounded well to prevent rolling
                         – Should be located near shaker, and accessible by the vibe lab crane
               •      Radiator mass simulator needed?
               •      Contamination/environmental
               •      MGSE Concept being worked on at SLAC (Martin Nordby)




    LAT-TD-00000-02                                                                                                      Page 8
        GLAST LAT Project                   Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                             Sine Vibe: Mechanical Issues
•      Known issues to be worked




    LAT-TD-00000-02                                                                               Page 9
    GLAST LAT Project                                 Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                              Sine Vibe: Test Configuration



                                         Test Interface Plate
            LAT appears to                fits completely on
             clear rotation                 expander head
           of expander head


                                Check on clearance
                                 to off-load frame




                                                                            LAT on Expander Head
                                                                            (with auxiliary support)




    LAT on Shaker Table
LAT-TD-00000-02                                                                                            Page 10
    GLAST LAT Project                        Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                         Sine Vibe: Test Configuration (cont.)




                                                                              Check on total height of
                                                                               4x4 Lift Fixture lifting
                                                                               GPR over top of ACD
             Check on clearance
             and access around
              underside of GPR




                                                  LAT on Expander Head
                                            Showing GPR Lift with 4x4 Lift Fixture
LAT-TD-00000-02                                                                                   Page 11
        GLAST LAT Project                          Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                      Sine Vibe: MGSE Concept

•     Test Interface Plate
       – Provides single interface for LAT
           in all test configurations
       – Mimics SC top deck
       – Ensures accurate alignment of SC
           flexures


          Plate serves only to
      accurately position brackets,
         not to carry vibe loads




                                                                                  Test Interface Plate
                                                                                   with SC Flexures
                                                                                  (on expander head)



                                                                      Mount brackets transfer load
                                                                      from flexure directly to table


                                                        Test Interface Plate
                                                         with SC Flexures
    LAT-TD-00000-02                                       (on slip table)                               Page 12
    GLAST LAT Project                  Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                        Sine Vibe: MGSE Mount Detail




LAT-TD-00000-02                                                                             Page 13
        GLAST LAT Project                                         Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                            Sine Vibration Test Planning: Detailed Sequence

•      Pre-test Activities
        – Move dolly into position in vibration lab and disconnect LAT from dolly (SLAC-IFCT)
        – Lift LAT and TIP onto expander head, and torque bolts (NRL)
        – Cable Hook-ups and system checkouts
               •      Electrical connections to shaker system and accel tap checks (NRL)
               •      Electrical connections to EGSE and perform LPT on expander head (SLAC)
•      Z-Axis Vibration Test
        – Low-level Signature Sine Sweep to 150 Hz (sweep up and down)
               •      Set-up sheet printouts (NRL), verification and approval (SLAC)
               •      If LPT results are okay, disconnect EGSE cables
               •      Run test
               •      Output FRF data (NRL)
               •      Review Data (SLAC)
                          – Determine notching, if needed
                          – Provide feedback to test conductor
                          – Check pass/fail criteria for Modal Test requirement
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Half-level run to 50 Hz
               •      Set-up sheet printouts (NRL), verification and approval (SLAC)
               •      Run test
               •      Output data hardcopies (NRL)
               •      Review Data (SLAC)
                         – Check notching and adjust, if needed
                         – Provide feedback to test conductor
               •      Give OK to proceed (SLAC), or decide alternate action is needed
    LAT-TD-00000-02                                                                                                    Page 14
        GLAST LAT Project                                           Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

               Sine Vibration Test Planning: Detailed Sequence (cont.)
•      Z-Axis Vibration Test (continued)
        – Full-level run to 50 Hz
               •      Set-up sheet printouts (NRL), verification and approval (SLAC)
               •      Run test
               •      Output data hardcopies (NRL)
               •      Review Data (SLAC)
                         – Check peak levels
                         – Check pass/fail criteria for Modal Test requirement
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Low-level Signature Sine Sweep to 150 Hz
               •      Set-up sheet printouts (NRL), verification and approval (SLAC)
               •      Run test
               •      Output data overlays (NRL)
               •      Review Data (SLAC)
                          – Re-Check pass/fail criteria for Modal Test requirement
               •      Concurrent with data review, hook-up EGSE and perform LPT
               •      If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
                      needed
•      Post- Z-Test / Pre- X-Test Activities
        – Disconnect all electrical connections
        – Remove mounting bolts and move LAT from expander head and set on handling dolly
        – Remove expander head, rotate shaker to horizontal position and attach drive bar to slip
           table
        – Lift LAT and TIP onto slip table for X-axis vibration and torque bolts
        – Hook-up accelerometers only and perform vibration control system checkout (no EGSE
           hook-up here)

    LAT-TD-00000-02                                                                                                      Page 15
        GLAST LAT Project                                           Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                       Sine Vibration Test Planning: Detailed Sequence (cont.)

•      X-Axis Vibration Test
        – Low-level Signature Sine Sweep to 150 Hz
               •      Same steps as Z-axis test
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Half-level run to 50 Hz
               •      Same steps as Z-axis test                                                        Shaker
               •      Give OK to proceed (SLAC), or decide alternate action is needed




                                                                                                                  LAT
         –   Full-level run to 50 Hz                                                                    Slip
               •      Same steps as Z-axis test                                                        Table




                                                                                                                        Y
                                                                                                                        X
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Low-level Signature Sine Sweep to 150 Hz
               •      Same steps as Z-axis test
               •      Concurrent with data review, hook-up EGSE and perform LPT
               •      If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
                      needed
•      Post- X-Test / Pre- Y-Test Activities
        – Disconnect EGSE electrical connections, leaving Accel cables connected
        – Remove mounting bolts, lift and rotate LAT in place
                                                                             Shaker
        – Lower LAT to slip table and torque bolts
        – Perform vibration control system checkout (no EGSE hook-up here)             Y
                                                                              Slip       X
                                                                             Table LAT



    LAT-TD-00000-02                                                                                                         Page 16
        GLAST LAT Project                                           Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

               Sine Vibration Test Planning: Detailed Sequence (cont.)
•      Y-Axis Vibration Test
        – Low-level Signature Sine Sweep to 150 Hz
               •      Same steps as X-axis test
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Half-level run to 50 Hz
               •      Same steps as X-axis test
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Full-level run to 50 Hz
               •      Same steps as X-axis test
               •      Give OK to proceed (SLAC), or decide alternate action is needed
         –   Low-level Signature Sine Sweep to 150 Hz
               •      Same steps as X-axis test
               •      Concurrent with data review, hook-up EGSE and perform LPT
               •      If data review and LPT are good, Give OK to break configuration, or decide is alternate action is
                      needed
•      Post- Y-Test Activities
        – Disconnect all electrical connections
        – Remove mounting bolts, lift and set LAT on handling dolly
        – Attach LAT to handling dolly




    LAT-TD-00000-02                                                                                                      Page 17
        GLAST LAT Project                                            Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                            Sine Vibration Test Planning: Test Configuration
•      Mechanical Configuration
        – Radiators not attached
               •      Are mass simulators required to represent load path from radiators?
               •      Currently no mass simulators are baselined
         –   Mounted to GD/Spectrum Astro-provided test flexures
               •      Test flexures will be proof tested at SLAC prior to GRID static test
               •      TIP to interface test flexures and slip table/expander head
        – LAT Z-axis is always vertical
        – Access to connectors needed (scaffold around expander head?) on +X side
        – Layout needed to check cable run lengths
•      Electrical Configuration
        – Voltage type accelerometers have BNC connectors to interface with NRL
        – Strain gauges do not have connectors (open leads)
        – EGSE needed for LPTs between axes (Rich Baun to define requirements)
•      Procedures
        – LAT-MD-00408: LAT Instrument Performance Verification Plan
        – LAT-MD-02717: LAT Environmental Test Sequence
        – LAT-MD-01196: LAT Dynamics Test Plan
        – LAT-MD-01533: LAT EGSE Plan
        – LAT-MD-00649: LAT Transportation and Handling Plan
        – LAT-MD-00404: LAT Contamination Control Plan
        – LAT-SS-00778: LAT Environmental Spec
        – LAT-TD-00890: LAT Instrumentation Plan


    LAT-TD-00000-02                                                                                                       Page 18
        GLAST LAT Project                                                     Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                Sine Vibration Test Planning: Logistics and A/I Closure Plans
•      Many logistics can be discussed during the tour
        – Any issues rotating shaker
        – Verify slip table and expander head size, inserts and pattern
        – CG Alignment / sensitivity of equipment to offsets
        – Instrumentation patch panels and cable supports
        – Floor space to set GPR and other GSE down
        – Capability and benefit of using force gauges
        – Clearance to off-load frame on expander head
        – Verify that Test Interface Plate fits completely on expander head
        – Verify that LAT clears bracket parts on slip table
        – Complete and release drawings/model of slip table and expander head
        – Complete detailed design and analysis of TIP and flexure mount brackets
        – Check on hook height in vibe room to ensure we can remove GPR when LAT is on expander head
        – Develop paper doll work-up to verify we have floor space for 2 carts, GPR, and 4x4 Lift Fixture
        – Develop requirements for Radiator simulator for sine vibe
        – Lay out EGSE cable routing and locate EGSE crates
        – Identify what contamination and humidity control is needed in vibe facility
        – Verify response / control channel capability
        – Is GN2 purge neccesary?
        – Cleanliness (need blanket?)
•      Contingencies
        – Need to be prepared to perform a modal test if the LAT frequencies do not meet expectations
               •      Modal test will not need additional instrumentation
               •      May require the use of portable shaker with stinger to RMB or other hardpoint
               •      Impact to schedule is not believed to be more than one day of testing (but rigorous post test data reduction will be
                      needed)
•      A/I Closure plans
        – Any action items unanswered by the end of the meeting will be tracked on a weekly basis
        – Let’s take a 15 minute break



    LAT-TD-00000-02                                                                                                                 Page 19
            GLAST LAT Project                                                                          Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                              Acoustic Test Planning: Action Item Status

        Dynamics Test Action Item List                                                                       Test Director: John Ku
        Acoustic, Vibe, Mass Properties                                                                            Updated: 18-Feb-05
                                                                                                                     Printed: 18-Mar-05
Total Actions: 48                                                                                      Open Actions:    25
  ID      Test                             Action Item                                 Actionee             ECD       Status         Status Comments/Disposition/Conclusions
 A100 ACST Acoustic test mid level run increase to 30 seconds                     John Ku               10/8/2004     Closed
 A101 ACST Evaluate supporting LAT at radiator mount brackets vs. SC              Chris Fransen         10/31/2004    Closed Overcome by events -- current baseline holds LAT by flexures
                flexures for acoustic test
 A102 ACST Incorporate plan for a sheet under test article into LAT dynamic       John Ku                11/15/2004    Closed 12/6 Requirement incorporated into test plan.
                test plan.
 A103 ACST Provide Microphone config to SLAC                                      Michael Lovellette     2/15/2005     Closed Microphones are fully repositionable, and can be moved with
                                                                                                                              tag lines at will
 A104    ACST Provide radiator support strut to SC interface stiffness.           Paul Baird             10/15/2004    Open Deliver to John Ku 10/22. Per e-mail from P. Baird on
                                                                                                         10/31/2004           10/22/04
                                                                                                         4/15/2005
 A105    ACST Check boundary conditions on the S/C flexures for comparison to Paul Baird                 10/31/2004    Open July drawing is most current. 3/8 fasteners. Flexure delivery late October.
              SLAC model. New model to be delivered to SLAC.                                             4/15/2005             Confirmed: "Each flexure mounts to an aluminum tube. There are nutplates
                                                                                                                               inside the tube for the bolts. At each end of the flexure, there is one 1/4 inch
                                                                                                                               "tension" bolt (NAS1351) and two 3/8 inch "shoulder" bolts (NAS6706)."


 A106    ACST Horiz or Vert orientation                                           John Ku                2/15/2005     Closed 2/15: opened at Plan Mtg; OK to be horiz or vert, but if horiz
                                                                                                                              LAT needs to be 3 ft off ground
 A107    ACST Add contingency plans if accel signals are lost                     John Ku                7/15/2005     Open* 2/15: opened at Plan Mtg. John Ku thinks a 10% loss is
                                                                                                                              acceptable, but will wait until the pre-test analysis to make the
                                                                                                                              final decision
 A108    ACST Is low-level acoustic run needed between mid- and high-level runs John Ku                  4/15/2005     Closed 2/15: opened at Plan Mtg. Agreement made to omit this test,
              to verify performance?                                                                                          as well as omit the discrete -3dB run (monitor only)
 A109    ACST How to bag the LAT during acoustic test to maintain cleanliness   Martin Nordby            4/15/2005     Open 2/15: opened at Plan Mtg; Often, instruments are bagged in
              (especially wrt contacting Radiator FOSR)                                                                       ESD bagging, which sits on a light-weight frame
 A110    ACST How to get over 1/2" door sill of acoustic chamber                Martin Nordby            4/15/2005     Open* 2/15: opened at Plan Mtg. Agreement made to use wheels
                                                                                                                              and not air bearings. Details TBD
 A111    ACST Deliver acoustic chamber CAD model with door, etc                   Paul Dizon             3/7/2005      Open 2/15: opened at Plan Mtg
                                                                                                         4/15/2005
 A112    ACST Check cable length, since connection to facility cables is through a John Ku               4/15/2005     Open 2/15: opened at Plan Mtg.
              penetration and outside the chamber (check if NRL has cables         Rich Bielawski
              available)




      LAT-TD-00000-02                                                                                                                                                                      Page 20
        GLAST LAT Project                                         Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                 Acoustic Test Planning: Test Plan Status

•      Objectives of the test are well understood by all
        – The objective of the acoustic test is to demonstrate that the fully integrated LAT is
           capable of withstanding acoustic noise loads, simulating launch conditions.
        – A secondary objective is to verify the acoustic analysis, i.e. that the LAT components
           were qualified to high enough levels of Random vibration

•      Test Plan
        – Many technical details have been addressed in previous meetings, and just need to be
            collected and summarized – many of these points will be raised today, and agreements
            made will go directly into plan
        – Instrumentation list is nearing completion, but not finished yet
               •      Internal accelerometers defined and CAD layout complete
               •      External accelerometer mathematical positions defined, but CAD layout needed
               •      Strain gauges (12 channels) on flexures expected, but not defined yet
         –   Entrance/Exit criteria are well understood by all
               •      No failure or damage to the LAT assembly as determined by physical inspection
               •      Inspection of plastic sheet under LAT does not produce any fibers, chips or fasteners
               •      No significant changes to the dynamic signature as determined by the pre and post low-level
                      acoustic vibration inputs
               •      No permanent deformations in the LAT structure or of any subsystem or component
               •      No significant degradation of instrument or system performance




    LAT-TD-00000-02                                                                                                    Page 21
        GLAST LAT Project                                            Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                             Acoustic Test Planning: Test Plan Status (cont.)

•      Test Personnel
        – Test support personnel have been identified (to be verified)
              • Test Director: John Ku (SLAC)
              • Test Conductor: Bob Haynes (NRL)
              • Discipline Lead: Jim Haughton (NRL)
              • Facility Manager:Bill Raynor (NRL)
              • MGSE Lead: Martin Nordby (SLAC)
              • EGSE Lead: Mike Huffer (SLAC)
              • Test Script Lead: Rich Baun (SLAC)
              • High-bay operations: Paul Dizon (NRL)
              • Quality Assurance: Darren Marsh (or Doug Bartholomew) (SLAC)
              • I&T: Ken Fouts (SLAC)
        – Subcommittees will be assembled from the appropriate personnel above, with expert
            consultation brought in if needed
               •      Potential Vibration Experts: Paul Baird; Chris Fransen; Bill Haile




    LAT-TD-00000-02                                                                                                       Page 22
        GLAST LAT Project                                         Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                            Acoustic Test Planning: Test Plan Status (cont.)

•      Test Requirements
        – Instrument Verification Plan
               •      The tests will be performed to the levels published in the LAT environmental specification
                      document, LAT-SS-00778
               •      The dynamics tests are to be performed in the mode in which the equipment will observe the
                      environment
                         – LAT will be launched in a “powered off” mode
                         – The acoustic test will be performed with the article powered off
         –   EGSE Constraints
               •      Cables
                         – Must be long enough to reach LAT while mounted to test stand
               •      Cart with EGSE Hardware
                         – Portable, can be rolled into and out of the chamber, if needed
                         – If cart is moved, does EGSE system need to be checked out again?
                         – Power interface to lab?




    LAT-TD-00000-02                                                                                                    Page 23
        GLAST LAT Project                                           Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                            Acoustic Test Planning: Test Plan Status (cont.)

•      Test Requirements
        – MGSE Constraints
               •      Test Interface Plate
                         – Should be one order of magnitude stiffer than the flexures
                         – Sufficient strength to carry all test loads with margin
                         – Can serve as SC top plate simulator
               •      Cable support structures
                         – Should allow free motion of cables between vibration equipment and ground
                         – Should be grounded well to prevent tipping
                         – Allow access to connector panels, blankets and externally mounted accelerometers
               •      Test stand / handling dolly
                         – Must accommodate mounting of radiators, with lower strut supports simulated
                         – The LAT should be positioned such that the flat panels are a minimum of 15° from parallel
                             to any of the test cell walls (45° preferred)
                         – Current strut design has rattle – design to be flight-like?
                         – Radiator plane should be lined up with high flow (2000 cfm) woofer to prevent air foil effect
               •      Contamination: is tenting needed; humidity
               •      MGSE Concept being worked on at SLAC (Martin Nordby)




    LAT-TD-00000-02                                                                                                      Page 24
         GLAST LAT Project                         Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                          Acoustic Test: Test Configuration and MGSE




This configuration is identical to
     EMI Test configuration




  Test Interface Plate mounts
       LAT to Test Stand




                                                                     Facsimile SC struts support
                                                                     Radiators with comparable
          Need to establish required                                          stiffness
          height off ground—can be
         handled by a separate stand
                                         LAT on Test Stand
     LAT-TD-00000-02                   (one Radiator removed                                            Page 25
        GLAST LAT Project                                           Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                Acoustic Test Planning: Detailed Sequence

•      Pre-test Activities
        – Chamber Setup and empty cell calibration
               •      This is needed to verify the test cell is clean and ready to accept the LAT for testing
               •      The empty cell calibration will verify that the specified sound pressure levels can be achieved
         –   Move LAT on dolly (radiators already installed) into chamber and secure dolly to chamber
             floor (orientation 45° TBD)
         –   Cable Hook-ups and system checkouts
               •      Electrical connections to shaker system and accel tap checks (NRL)
               •      Electrical connections to EGSE and perform LPT on expander head (SLAC)
        – LPT on acoustic test stand
•      Low-Level run at -6 dB for 30 seconds (establish pre-test signature, review data)
        – Set-up sheet printouts (NRL), verification and approval (SLAC)
        – If LPT results okay, disconnect EGSE cables and close chamber door
        – Purge chamber of air
        – Run Test
        – Output Data, accel ASD’s and strain gauge SSD’s (NRL)
        – Review data (SLAC)
               •      Check for “dead” channels
               •      Review mic average for level and chamber uniformity
               •      Review Grms values for obvious anomalies
         –   Give Okay to proceeed (SLAC), or decide if alternate action is needed



    LAT-TD-00000-02                                                                                                      Page 26
        GLAST LAT Project                                            Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                           Acoustic Test Planning: Detailed Sequence (cont.)

•      Full-Level run at -0 dB for 60 seconds (impart full SPL, check SPL, linearity, review data)
        – Set-up sheet printouts (NRL), verification and approval (SLAC)
        – Run Full level Test
               •      As level steps up to -3dB, check critical channel linearity and record data
               •      Hold at full level for 60 seconds
         –   Immediately following full level run, perform low level run
               •      Do not review data between full level and post-test low level run
         –   Output Data accel ASD’s and strain gauge SSD’s (NRL)
         –   Review data (SLAC)
               •      Check for “dead” channels
               •      Review mic average that PFQ level is met and chamber uniformity
               •      Review Grms values for linearity
         –   Give Okay to proceeed (SLAC), or decide if alternate action is needed




    LAT-TD-00000-02                                                                                                       Page 27
        GLAST LAT Project                                         Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                      Acoustic Test Planning: Detailed Sequence (cont.)
•      Low-Level run at -6 dB for 30 seconds (Signature check, review data, complete axis)
        – Output Data (NRL)
        – Review data (SLAC)
               •      Check for “dead” channels
               •      Review mic average for level and chamber uniformity
               •      Review pre- and post- test overlays for frequency shifts and amplitude changes
        – Give Okay to proceeed (SLAC), or decide if alternate action is needed
•      Post- Acoustic Test Activities
        – Fill chamber with air (may be done automatically following final low-level run
        – Connect EGSE and perform LPT
        – Visually inspect plastic sheet under LAT
        – If everything looks okay, give okay to break configuration
        – Disconnect all electrical connections
        – Disconnect dolly from floor and move LAT out of chamber




    LAT-TD-00000-02                                                                                                    Page 28
        GLAST LAT Project                                            Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                Acoustic Test Planning: Test Configuration

•      Mechanical Configuration
        – Radiators attached (with flight thermal joint)
               •      Need to ensure thermal joint has enough time to cure (7 days RT)
         –   Mounted to GD/Spectrum Astro-provided test flexures
               •      Test flexures will be proof tested at SLAC prior to GRID static test
               •      Mounted on LAT acoustic test stand
        – LAT Z-axis is vertical
        – Access to connectors needed (temporary scaffold or ladder around MGSE) on +X side
        – Layout needed to check cable run lengths
•      Electrical Configuration
        – Voltage type accelerometers have BNC connectors to interface with NRL
        – Strain gauges do not have connectors (open leads)
        – EGSE needed for LPTs before and after test (Rich Baun to define requirements)
•      Procedures
        – LAT-MD-00408: LAT Instrument Performance Verification Plan
        – LAT-MD-02717: LAT Environmental Test Sequence
        – LAT-MD-01196: LAT Dynamics Test Plan
        – LAT-MD-01533: LAT EGSE Plan
        – LAT-MD-00649: LAT Transportation and Handling Plan
        – LAT-MD-00404: LAT Contamination Control Plan
        – LAT-SS-00778: LAT Environmental Spec
        – LAT-TD-00890: LAT Instrumentation Plan

    LAT-TD-00000-02                                                                                                       Page 29
        GLAST LAT Project                              Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                      Acoustic Test Planning: Logistics and A/I Closure Plans

•      Many logistics can be discussed during the tour
        – Lip at threshold (how to transport into room)
        – Mic placement / adjustability
        – Cleanliness (need blanket?) – is rating worse than 100K?
        – Height off ground (Chris Fransen believes current configuration should be okay, but need
            to check)
        – Placement in room (note any obstructions)
        – Note flow rate of pneumatic horns and possible currents in chamber
        – Instrumentation feedthrough and cable supports
        – Floor inserts to secure LAT
        – Is a dust tent needed around LAT in acoustic chamber
        – What type of panels are needed in/around LAT to simulate SC response
        – Accommodation for moving Test Stand over ½” door sill
        – How high does Radiator need to be off the floor: affects Test Stand spacer height
•      A/I Closure plans
        – Any action items unanswered by the end of the meeting will be tracked on a weekly basis




•      Let’s take a lunch break and come back for the tour



    LAT-TD-00000-02                                                                                         Page 30
        GLAST LAT Project                              Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                      Agenda: Facilities Tour

•      Acoustic Test Planning  1:00 – 1:45
        – Overview (BR)  1:00 – 1:10
        – Run through test sequence described earlier (JK)  1:10 – 1:25
        – Other things to discuss (All)  1:25 – 1:45
•      Sine Vibration Test Planning  1:45 – 2:45
        – Overview (BR)  1:45 – 1:55
        – Run through test sequence described earlier (JK)  1:55 – 2:10
        – Things to discuss (All)  2:10 – 2:30
        – Control room (BR)  2:30 – 2:45
•      Mass Properties Planning  2:45 – 3:15
        – Overview (BR)  2:45 – 2:55
        – Action Item List Status (JK)  2:55 – 3:00
        – Run through test sequence (JK)  3:00 – 3:10
        – Discuss capabilities of spin table and decide is MOI is needed (All)  3:10 – 3:15




    LAT-TD-00000-02                                                                                         Page 31
           GLAST LAT Project                                                 Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                                   Facilities Tour: Mass Properties
   •       Mass Properties Planning  2:45 – 3:15
            – Overview (BR)  2:45 – 2:55
            – Action Item List Status (JK)  2:55 – 3:00
        Dynamics Test Action Item List                                            Test Director: John Ku
        Acoustic, Vibe, Mass Properties                                                  Updated: 18-Feb-05
                                                                                           Printed: 18-Mar-05
Total Actions: 46                                                            Open Actions:    34
  ID      Test                    Action Item                     Actionee        ECD       Status         Status Comments/Disposition/Conclusions
 M100 MASS Wt and cg measurement with or without Rad's       John Ku                       Closed 2/15: opened at Plan Mtg. Measurement without Radiators
                                                                                                  agreed upon


             –     Run through test sequence (JK)  3:00 – 3:10
                      •    Remove non-flight instrumentation
                      •    Move LAT and dolly into mass properties area
                      •    Lift LAT onto MOI table and measure mass, Izz, and Xcg and Ycg
                      •    Turn Dolly over to Z-horizontal configuration
                      •    Attach three load cells beneath handling dolly and measure mass and Z-cg
                      •    Turn dolly back to Z-vertical position
                      •    Return LAT to Dolly
                      •    Turn LAT and dolly over to Z-horizontal configuration
                      •    Measure combined mass and Zcg
             –     Discuss capabilities of spin table and MOI (pendulum) table and decide is MOI is needed
                   (All)  3:10 – 3:15

   •       Configuration
            – LAT Mass properties may be a combination of measured and calculated properties
                      •    Radiators off
                      •    On LAT handling dolly for Z-axis measurement


       LAT-TD-00000-02                                                                                                                       Page 32
        GLAST LAT Project                               Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                             Agenda: Afternoon Planning Meeting

•      Mass Properties Summary  3:30 – 3:45
        – Agreements made today (JK)  3:30 – 3:35
        – Items that still need to be worked out (All)  3:35 – 3:40
        – Path to test (JK)  3:40 – 3:45
•      Sine Vibration Summary  3:45 – 4:15
        – Agreements made today (JK)  3:45 – 3:55
        – Items that still need to be worked out (All)  3:55 – 4:05
        – Path to test (JK)  4:05 – 4:15
•      Acoustic Test Summary  4:15 – 4:45
        – Agreements made today (JK)  4:15 – 4:25
        – Items that still need to be worked out (All)  4:25 – 4:35
        – Path to test (JK)  4:35 – 4:45
•      Action Item Review 4:45 – 5:30
        – Collect action items (JK)  4:45 – 5:00
        – Read through action items (JK)  5:00 – 5:15
        – Other? (All)  5:15 – 5:30




    LAT-TD-00000-02                                                                                          Page 33
        GLAST LAT Project                                             Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                              Mass Properties Summary

•      Agreements made today
        – MOI & Spin table is not ideal for our needs
        – Static CG and Mass measurement can be accomplished with load cells
               •      If we want a 2mm CG resolution, then a 15lbf load cell resolution is needed
               •      Static LAT mass is up to 3000 kg (6614 lbf).
               •      If three load cells are used, each load cell should be rated to 2205 lbf +/- 15lbf




•      Items that still need to be worked out
         – Check IRD & MAR for CG requirement
               •      Reqmt is <20mm for Xcg and Ycg
               •      Reqmt is <185mm above LIP




•      Path to test



    LAT-TD-00000-02                                                                                                        Page 34
        GLAST LAT Project                             Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                    Sine Vibration Summary

•      Agreements made today
         – EGSE out of room if cables are long enough (desirement, not requirement)
         – Verification of accels at SLAC using a 1g shaker before mounting, tap check and touch
           check after mounting
         – Keep full level vibe spectrum as is (with changes in sweep rate)
         – Low level sine sweep up and down
         – NRL to provide accel hookup to LAT
         – QA managed by SLAC (Darren Marsh), but staffed by SLAC and NRL
         – Proof Test MGSE at SLAC
•      Items that still need to be worked out
         – Structural analysis of TIP and associated MGSE
         – Is mass simulator for radiators needed
         – Determine need for force gauges
         – Simulate LAT on fixture to check for fixture modes
•      Path to test
         – Force gauge decision by 3/25
         – Release test plan by 3/25
         – Plan for Mid to late April PDR (with most A/I’s closed)
         – Complete pretest analysis and release memo one month prior to test




    LAT-TD-00000-02                                                                                        Page 35
        GLAST LAT Project                             Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                        Acoustic Summary

•      Agreements made today
         – No straps needed
         – Radiators low to floor (3-5cm) is okay
         – Line up radiator plane to main woofer output
         – Omit mid-level run  just monitor and collect data
         – Go from full level to low level immediately (no data review)
         – Use wheels instead of air bearings  need to decide on pneumatic or solid tires
•      Items that still need to be worked out
         – Verify top plate adequately simulated with MGSE
•      Path to test
         – Release test plan by 3/25
         – Complete pretest analysis and release memo one month prior to test




    LAT-TD-00000-02                                                                                        Page 36
            GLAST LAT Project                                                                        Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                                                      Action Item Review (New ones only)


        Dynamics Test Action Item List                                                                      Test Director: John Ku
        Acoustic, Vibe, Mass Properties                                                                            Updated:     18-Feb-05
                                                                                                                     Printed:   18-Mar-05
Total Actions: 46                                                                                      Open Actions:    34
  ID      Test                              Action Item                                   Actionee           ECD      Status           Status Comments/Disposition/Conclusions
 V119     VIBE Identify power drops and grounds on facility drawings                Bill Raynor         4/1/2005      Open      3/14: Plan Mtg at NRL
 V120     VIBE Send updated floor layout of sine vibe lab as well as an overall     Bill Raynor / Paul  3/25/2005     Open      3/14: Plan Mtg at NRL
                layout showing relative layout of different labs                    Dizon
 V121     VIBE GSFC to evaluate SC strut to radiator design (current design         Paul Baird          4/1/2005      Open      3/14: Plan Mtg at NRL
                shows potential rattling…is this GD's intention?
 V122     VIBE Provide effective stiffness of struts and SC bus so SLAC can         Paul Baird         4/1/2005       Open 3/14: Plan Mtg at NRL
                design an appropriate support structure for acoustic testing
 V123     VIBE Are mass sims needed to simulate radiators during vibe test?         John Ku            4/1/2005       Open 3/14: Plan Mtg at NRL
 V124     VIBE How are XLHPs and DSHPs supported when no VCHPs are                  Martin Nordby      4/15/2005      Open 3/14: Plan Mtg at NRL
                present
 V125     VIBE Provide detail of accelerometer electrical configuration including   Martin Nordby      4/15/2005      Open 3/14: Plan Mtg at NRL
                ACD cables, to ensure interface to NRL
 V126     VIBE Deliver Test-verified NASTRAN model of expander head                 Jim Haughton       4/1/2005      Open 3/14: Plan Mtg at NRL
 V127     VIBE provide force gauge information (Kistler 9057?) and what inventory   Bob Haynes         3/25/2005     Closed 3/14: Plan Mtg at NRL. Per agreement between John Ku,
                GSFC has. We will baseline 10K force gauges                                                                 Chris Fransen, and Paul Baird, Force gauge instrumentation
                                                                                                                            during sine vibration testing will not be required by the GPO
 V128    VIBE Investigate leasing of force gauges                                   Bob Haynes         3/25/2005     Closed 3/14: Plan Mtg at NRL. No longer necessary since force
                                                                                                                            gauges will not be used.
 V129    VIBE Check clearance between XLAT and TIP.                           Mike Foss / Martin       4/1/2005      Open 3/14: Plan Mtg at NRL. If interior screws need to be torqued,
                                                                              Nordby                                        is there tool access?
 V130    VIBE Provide back-up analysis to show reason for adding force gauges Chris Fransen            3/25/2005     Closed 3/14: Plan Mtg at NRL. Added cost to current baseline, which
              and how many are needed                                                                                       is currently no force gauges and only strain gauges on
                                                                                                                            flexures. Upon further review, force gauges are not needed.

 V131    VIBE Provide list of load cells suitable for CG determination              Bill Raynor        4/15/2005      Open 3/14: Plan Mtg at NRL.

 A113    ACST Ensure enough cure time for radiator thermal joint (7 day RT cure) Marc Campell          4/15/2005      Open 3/14: Plan Mtg at NRL




      LAT-TD-00000-02                                                                                                                                                     Page 37
        GLAST LAT Project                       Environmental Test TIM, Day 1: Structural Tests, March 14, 2005

                               Dynamics Tests Action Item Form


•      Topic / presentation slide number:

•      Submitted by:

•      Actionee:

•      Request:




•      Reason / Comment:




    LAT-TD-00000-02                                                                                  Page 38

				
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