GLAST Proposal Review by r5uhfBp

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									      GLAST LAT Project         DOE/NASA Mechanical Systems Peer Review, March 27, 2003




Gamma-ray Large           GLAST Large Area Telescope:
Area Space
Telescope
                          Mechanical Systems Peer Review
                          March 27, 2003
                          Section 2.2 – Budgets & Metrics


                          Leonard Lee
                          SLAC
                          Systems Engineer

                          lhlee@slac.stanford.edu


 Document: LAT-PR-0XXXX                     Section 2.2 Budgets & Metrics     1
     GLAST LAT Project      DOE/NASA Mechanical Systems Peer Review, March 27, 2003


                           Topics

Agenda
• Allocated budgets (mass, c.g.,power)
• Drawing and Procedure Metrics
   – Mechanical Subsystem drawing tree
   – Status of major assemblies, critical component drawings,
      and procedures
   – Document status




Document: LAT-PR-0XXXX                  Section 2.2 Budgets & Metrics     2
         GLAST LAT Project                                                DOE/NASA Mechanical Systems Peer Review, March 27, 2003



                 LAT Metrics: Allocated Mass Budget
    March 2003
Mass (kg)    Estimate              Alloc.
                                                                  Mass Estimate Breakdown
 TKR           504.9                510.0
 CAL          1375.8               1440.0                                       (kg)          %
 ACD           270.1                280.0                        Parametric    382.3        14.3%
 Mech          329.3                345.0                        Calculated    975.8        36.4%
 Elec          199.3                220.0                        Measured     1321.3        49.3%
LAT Total     2679.4               2795.0                        Total        2679.4        100%
Rsrv/Margin    320.6
Rsrv/Margin* 12.0%
Allocation                         3000.0
* AIAA G-020 recommended min reserve = 7.2%
                                                          3000

                                                                      LAT Margin
                                                                                                      5.4%                                     I-PSR
Center of Mass (mm)                                       2900
                                                                                                               dPDR   I-CDR
 CMx              1.26 -20 < CMx < 20                                               10.9%
 CMy             -0.54 -20 < CMy < 20                                                                                           LAT Reserve
                                                          2800
 CMz            -86.89 CMz < -51.2
                                              Mass (kg)




                                                                                             I-PDR
 Ht off LIP     149.31    Ht < 185                                                                                            Subsystem Allocation
                                                          2700
Second Moment of Inertia (kg-m2)
                                                                   Prop            I-SRR
 Ixx       1057.7           1500.0                        2600
 Iyy       1014.9           1500.0
 Izz       1339.5           2000.0
                                                          2500                                                                  Mass Budget
                                                                                                                                Review Threshold
                                                                                                                                Total Allocated to S.S.
                                                          2400                                                                  LAT Mass Estimate
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Document: LAT-PR-0XXXX                                                                         Section 2.2 Budgets & Metrics               3
     GLAST LAT Project                       DOE/NASA Mechanical Systems Peer Review, March 27, 2003



          Mechanical Subsystem Mass Budget
    Subsystem Mass Status
                                     Subsystem Mass Estimates (kg)
                    Current
    Subsystem                      PARA          CALC        MEAS          Total
                     Alloc.
    TKR                 510.0       0.0          504.9        0.0          504.9
    CAL               1440.0        53.0          26.5       1296.3       1375.8
    ACD                 280.0       35.5         209.6        25.1         270.1
    Mech                345.0      143.2         186.0        0.0          329.3
    DAQ Elec            220.0      150.6          48.7        0.0          199.3
    LAT Total         2795.0       382.3         975.8       1321.3       2679.4
    % of Total                     14.3%         36.4%       49.3%        100.0%
    "Current" Allocations per CCB action on 7 Mar 03




Document: LAT-PR-0XXXX                                   Section 2.2 Budgets & Metrics     4
     GLAST LAT Project                DOE/NASA Mechanical Systems Peer Review, March 27, 2003


            Mechanical Systems Power Budget

Condition                     Power Mode                                 Allocation

  LAT “On”           Radiator VCHP Heater Power                           <48 watts

          Mechanical Systems Power”On”= 48 watts



                     Survival Heater Peak Power                           <350 watts

  LAT “Off”          Orbit-Average Survival
                              Heater Power                   <300 watts@27 Volts
                                                                              min
                     Orbit-Average Survival
                              Heater Power                   <350 watts@29 Volts
                                                                              max

          Mechanical Systems Power”Off”= 300-350 watts(27-29 volts)

Document: LAT-PR-0XXXX                            Section 2.2 Budgets & Metrics     5
            GLAST LAT Project                                                               DOE/NASA Mechanical Systems Peer Review, March 27, 2003


                                                                                 Drawing Tree
                                                                     Mechanical Systems Drawing Tree

                                                                                                                      1
                                                                                                   Grid Box Assy
                                                                                                  M




                                                                   EMI Shield                                                                               2
                                                                                                                                            Grid Box Base
           Connector Panel           TCS External Box                Details          X-LAT Plate Assy         Mid-Plate Assy
                                                                                                                                                 Assy
                                                                  (4 drawings)                               SCD                           M
                                                              M                       SCD


TCS Connector
Support Bracket                                       External Box                                                     LH & RH Down
                                                                                                                                                                Grid Assy
                                                         Base                                                          Spout Heat Pipe
                                                                                                                      SCD



                                                      External Box                                                      LH & RH Heat
                                                         Cover                                                         Pipe Patch Panel
                                                                                                                                                                                4 x 4 Grid



                                                                                                                       Top Flange Heat
                                                                                                                             Pipe                                              LH & RH
                                                                                                                      SCD                                                    Radiator Mount
                                                                                                                                                                                Bracket


                                                                                                                          Purge Groove
                                                                                                                                                                                Spacecraft
                                                                                                                              Cap                                                                 3
                                                                                                                                                                            Interface Stiffener
                                                                                                                                                                                  (Wing)


                                                                                                                           Thermistors


         NOTES:
         1. Grid Box Assy is for Mechanical Systems Testing only.
         2. Grid Box Base Assy is delivered to I&T for LAT integration                                                  Flight Heaters
            along with all of the uninstalled Grid Box Assy parts.                                                    SCD
         3. Wing may become integral part of 4x4 Grid.


                                                                                                                          Grid Schematic

           M = Make
           B = Buy
           SCD = Source Control Drawing

                                                                           SCD    M         B    SCD
 Document: LAT-PR-0XXXX                                                                                            Section 2.2 Budgets & Metrics                                     6
       GLAST LAT Project                               DOE/NASA Mechanical Systems Peer Review, March 27, 2003

              Status of major assemblies, critical
             component drawings, and procedures
                                                                                DRAWING STATUS
 QTY   Drawing Number   Drawing Title                           Drawn By   Not Started Draft Check   Released
  1    LAT -DS-01581    Grid Box Assembly Drawing               JS                        X
  2    LAT -DS-01247    X-LAT Plate SCD                         CW                              X
  1    LAT -DS-01257    Mid-plate SCD                           CW                              X
  1    LAT -DS-01261    Left Hand + X EMI Shield                CW                        X
  1    LAT -DS-01262    Left Hand -X EMI Shield                 CW                        X
  2    LAT -DS-01263    Right Hand +/- X EMI Shield             CW                        X
  4    LAT -DS-01258    Center EMI-Shield                       DP                        X
  8    LAT -DS-01264    Connector Plate                         DP                        X
                        TCS Connector Support Bracket                             X
  2                     TCS External Box                                          X
  1                     External Box Base                                         X
  1                     External Box Cover
  1    LAT -DS-01580    Grid Box Base Assembly Drawing          JS                       X
  6    LAT -DS-01391    Right Hand Down Spout Heat Pipe SCD     JS                             X
  6    LAT -DS-01292    Left Hand Down Spout Heat Pipe SCD      JS                             X
  2    LAT -DS-01259    Left Hand HP Patch Panel                DP                       X
  2    LAT -DS-01260    Right Hand HP Patch Panel               DP                       X
  5    LAT -DS-01393    Top Flange Heat Pipe SCD                JS                       X
  2    LAT -DS-01268    Purge Groove Cover Plate #1             JS                       X
  8                     Grid Heater                                             X
  x                     Grid Cable Routing Drawing                              X
  x                     Grid Schematic                                          X
  1    LAT -DS-01267    Grid Assembly                           JS                       X
  1    LAT -DS-01579    4 x 4 Grid Machining                    JS                       X
  2    LAT -DS-01265    Left Hand Radiator Mount Bracket        DP                             X
  2    LAT -DS-01266    Right Hand Radiator Mount Bracket       DP                             X
  4                     Spacecraft Interface Stiffener (Wing)                   X




                                                     Total Drawings =           7       13     6          0



Document: LAT-PR-0XXXX                                                  Section 2.2 Budgets & Metrics           7
       GLAST LAT Project                               DOE/NASA Mechanical Systems Peer Review, March 27, 2003


                                       Document Status
 Document Title                     Document Number                  Author   Not Started   Draft   Check   Released
 Fabrication Plan                   LAT -DS-xxxxx                    SLAC         X
 4 x 4 Grid Fabrication Plan        LAT -DS-xxxxx                     Sub                    X
 Assembly Plan                      LAT-DS-xxxx                      SLAC         X
 Riadiator Process Plan             LAT -DS-xxxxx                     LM                     X
 Heat Pipe Process Plan             LAT -DS-xxxxx                     LM                     X
 X-LAT/Mid-Plate Process Plan       LAT -DS-xxxxx                     LM          X

 Mechanical Systems Test Plan       LAT-SS-00493                     SLAC                    X
 Grid Box Assembly Test Plan        LAT -DS-01317-01                 SLAC         X
 4 x 4 Grid Test Plan               LAT -DS-01316-01                 SLAC                    X
 Radiator Test Plan                 LAT -DS-xxxxx                     LM          X
 Heat Pipe Test Plan                LAT -DS-xxxxx                     LM          X
 X-LAT/Mid-Plate Test Plan          LAT -DS-xxxxx                     LM          X
 TCS Test Plan                      LAT -DS-xxxxx                     LM          X

 Grid Box Assembly Test Procedure   LAT -DS-xxxxx                    SLAC         X
 4 x 4 Grid Test Procedures         LAT -DS-xxxxx                    SLAC         X




                                             TOTAL DOCUMENTS                      10         5        0        0




Document: LAT-PR-0XXXX                                             Section 2.2 Budgets & Metrics               8
     GLAST LAT Project      DOE/NASA Mechanical Systems Peer Review, March 27, 2003




                         End of
                          Section 2.2




Document: LAT-PR-0XXXX                  Section 2.2 Budgets & Metrics     9

								
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