Design the Moving and Handling Fixture

for the DECAM Imager

Edward Chi

Fermilab

November 17, 2008

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Fixture for the Decam Imager

Decam Imager: ~1,300 lbs. Center of the gravity: ~8.63” from the edge of the back

cover flange.

View of the Fixture connects with the Imager together

Main function of the Fixture:

• Supports the Imager;

• Disconnects the Imager from the telescope;

• Moves the Imager to the designated location.

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Main Design Criteria of the Fixture

• Retrofits the existing Imager design configuration and the usage of the existing equipments.

• The size, weight and the configuration of the fixture must consider the availability of operation.

• Meets the applicable codes for a structurally sound design.

• Minimizes the material, fabrication and other design related cost and time.

+ =

4The overall view of the Imager at the northwest location (tilting 6.324 degree with Blanco floor level)

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View of the interferences between the crates (4) and the PF cage ring

Movable Stand of the platform carriage

View of the Imager from carriage stand

direction

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The initial vessel back flange

The modified vessel back flange

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Views with the modified vessel back flange, moving off the camera io module, ion pump controller, cooling piping, pump, ac distribute box and the heat shields of the crates. Notice of the clearance between the PF cage ring and the crates

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Half circle angle shape connect ring design for retrofitting the existing Imager configuration, also for the handling & structural consideration. (~23.5 lbs. mass weight per connect ring)

Installed it in the designated location.

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Both half connect rings (2) installed in position

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Connects the stud, 39” x 1.75” (overall), ~23 lbs. to the designated location with the

appropriate torque value.

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Install all 6 connecting studs one by one to the connect rings in the designated location.

About 9.25” circular gap (space) between two studs for operating access.

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Installs the reinforcing connect ring to the designated location

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Installs the octagon shape mounting plate to the carriage stand, adjusts it to the designated position.

Installs the connect plate (round) to the octagon plate, aligns it to the designated position.

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Moves the carriage stand to the designated location, assemble the counterweight octagon connecting plate with the 6 studs together.

Another view before the carriage stand connect with the Imager through the fixture.

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The Imager supported by the carriage stand through the fixture, moved away from the PF Cage assemble area for 40”.

An FEM and the analysis results can be found from slides #18 to #23.

Another view of the Imager connect with the carriage stand through the fixture, before disconnecting and moving out from the PF Cage assemble area.

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The view of the fixture with the Imager, moved away from the PF Cage area by the carriage stand. See the angle between the ctr. Line of the fixture and the Blanco floor (~6.32 deg.)

Using the turnbuckle device of the carriage to adjust the angle between the imager-fixture and the Blanco floor to about zero degree.

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Installed the hoist rings to the designated location, the Imager is ready to disconnect from the carriage stand, or from the fixture per experimental further detail specification.

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Brief of the FEA results from the simulating model of the Fixture with the Decam Imager

• Simulating the Decam Imager with a more conservative boundary condition:

a). ~1,475 lbs force with the ctr. gravity @9.25” away from edge of the back cover flange.

b). Less restraint location than the actual application of the fixture connects with the

platform carriage stand.

• Maximum calculated working tensile/compressive) stress: fy = 10.98 ksi < Ft = 21.6 ksi

• Maximum calculated working shear stress: fv = 7.58 ksi < Fv = 14.4 ksi

• The maximum deflection: ∆y = ~ 0.041” (~1.04 mm).

Where: Ft is the allowable tensile/compressive stress of the fixture material.

Fv is the allowable shear stress of the fixture material.

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Simulating the imagerwith similar weight

and gravity ctr.

Fixture with the Decam Imager

The simulator of the fixture and imager for FEM

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The FEA display picture for the model to simulate the Fixture connecting with the Decam Imager

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I-DEAS 12 NX Series m2: Simulation 04-Nov-08 14:07:12

C:\PPD_IDM_PPD106547\ECC_DES_FIXTURE5_IMAGER_1108.mf1 Group ID : None Result Set : 3 - B.C. 1,STRESS_3,LOAD SET 1 Report Type : Contour Units : IN Result Type : STRESS Frame of Reference: Part Data Component: Y-Component Stress-XX Stress-XY Stress-YY Stress-XZ Stress-YZ Stress-ZZ Noda 80 3229 80 36 76 34407 Maximum 4.541E+03 2.173E+03 1.060E+04 1.968E+03 2.804E+03 7.578E+03 Noda 76 3373 76 589 32476 40461 Minimum -4.686E+03 -2.178E+03 -1.098E+04 -2.317E+03 -2.533E+03 -7.350E+03 Average 2.039E-01 -9.252E-02 4.393E-01 -1.057E-01 2.112E+01 -3.356E+00

The calculated working stresses of the Fixture under the boundary condition 2

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I-DEAS 12 NX Series m2: Simulation 04-Nov-08 15:39:48

C:\PPD_IDM_PPD106547\ECC_DES_FIXTURE5_IMAGER_1108.mf1 Group ID : NoneResult Set : 1 - B.C. 1, DISPLACEMENT_1,LOAD SET 1 Report Type: Contour Units : InResult Type: Displacement Frame of Reference: Part Data Component: Y-Component Displa-X Displa-Y Displa-Z Displa-RX Displa-RY Displa-RZ 33875 472 42053 1 1 1 Maximum 6.290E-04 4.097E-02 2.743E-03 0.000E+00 0.000E+00 0.000E+00 5717 819 30093 1 1 1 Minimum -6.900E-04 -1.280E-04 -2.738E-03 0.000E+00 0.000E+00 0.000E+00 Average -3.006E-05 1.782E-02 -1.026E-05 0.000E+00 0.000E+00 0.000E+00

The calculated working deflections of the Fixture under the boundary condition 2

Maximumdeflection

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I-DEAS 12 NX Series m2: Simulation 04-Nov-08 15:37:11 C:\PPD_IDM_PPD106547\ECC_DES_FIXTURE5_IMAGER_1108.mf1 Stresses under BC2 Group ID : None Result Set : 2 - B.C. 1,REACTION FORCE_2,LOAD SET 1 Report Type : Contour Units : IN Result Type : REACTION FORCE Frame of Reference: Part Data Component: Y-Component Reacti-X Reacti-Y Reacti-Z Reacti-RX Reacti-RY Reacti-RZ Total 9.155E-05 -3.443E+03 -1.068E-04 0.000E+00 0.000E+00 0.000E+00 3196 17 76 15 15 15 Maximum 3.448E+02 7.052E+02 5.116E+02 0.000E+00 0.000E+00 0.000E+00 3124 3196 80 15 15 15 Minimum -3.417E+02 -1.464E+03 -5.358E+02 0.000E+00 0.000E+00 0.000E+00 Average 4.578E-06 -1.722E+02 -5.341E-06 0.000E+00 0.000E+00 0.000E+00

The calculated total reaction forces of the Fixture under the boundary condition 2

The total reactionforce = the total

mass weight

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More Imager Fixture modifications can and will make upon:

• Your comments;

• Your Inputs;

• Your applications;

• And your…