Status report AHCAL Mechanics Karsten Gadow CALICE Collaboration Meeting KEK, 19.04.2015 Studies of...

status report

AHCALMechanics

Karsten GadowCALICE Collaboration MeetingKEK, 19.04.2015

Studies of AHCAL absorber structure stability

Karsten Gadow | CALICE Collaboration Meeting | 19.04.2015 | Page 2

AHCAL Mechanicsstatus report outline

• Submodule assembly and active layer integration

• Submodule transportation

• Submodule installation

• Absorber structure validation (static)

• Absorber structure validation (dynamic)

AHCAL Mechanicsstatus report

AHCAL MechanicsFE Model Parameters

parameters for submodule validations:

• Mesh Type

• shell bodies for all plates

• solid bodies for transportation and assembly brackets

• Mesh Statistics

• ~ 575.000 nodes, 295.000 elements

• refined local sub-models: 1.5M nodes, 870k elements

• Contacts

• bonded contacts (all DOF fixed) on lines and faces of shell bodies

• bolts modeled as spring elements in refined sub-model in case of high load concentrations

AHCAL submodulecase 0 absorber assembly and active layer integration

How to support the submodule during assembly and active layer integration ?

AHCAL submodulecase 0.1 absorber assembly and active layer integration

case 0.1: support on the side plate

case 0.2: support on absorber plate front edge

case 0.3: support on absorber plate 75 mm from side edge

AHCAL submodulecase 0 absorber assembly and active layer integration

conclusion:

• case 0.1 will is the best way to support the submodule

• supporting the submodule according case 0.2 and 0.3 will be not safe for the sensitive layers due to the local deformation of the plates

• to be sure, that the submodule stays on the side walls, we have to foresee an overlap of 3 mm from the edge of the side plates to the first absorber plate surface

AHCAL submodulecase 1 submodule transportation

10x2 M10 screws per bracket and fixed at layer 37 to 46

single crane hook

steel ropes for crane: modeled as 20mm dia. beam elements to central fixed point

conclusion:

• the transportation with one hook is possible without a risk to destroy the absorber stack

• the deformation of the stack is tolerable with the current design of the sensitive layer housings

• the lifting device needs a special investigation

AHCAL submodulecase 2 submodule installation

installation of submodules in front of the cryostat by crane

sub module connection by plates from the front and back side

• 2 x 18 t capacity

• operation with 2 hooks

• precise motor controlled turning

• adaptation for submodules with sensitive layers

lifting and turning tool for AHCAL barrel absorber sub-modules available

10x2 M10 screws per bracket layer 27 to 37

2 crane hooks

submodule validationcase 2.0: 0°case 2.1: 22,5°case 2.2: 45°case 2.3: 67,5°case 2.4: 90°case 2.5: 112,5°case 2.6: 135°case 2.7: 157,5°case 2.8: 180°

rotation point in gravity center

lifting beam for rotation and assembly: 4x100mm dia. beam elements to two fixed points

case 2.0

max. equivalent stress

° rotation

conclusion :

• the simulated behavior of the submodule during the rotation is in a save condition

• the connection to the turning tool has to be investigated more carefully

• during the simulation it turned out, that the connection plates of the submodules has to be modified for installation reasons

AHCAL Mechanicsabsorber structure validation (static)

• gravity + 1g

• realistic support and displacements

• installed ECAL masses

• 10,0 mm maximum deformation

• 50 times exaltation graphic

• ~360 N/mm² maximum tension

• 50 times exaltation graphic

conclusion:

• the static model is understood

• all values of stress and deformation are in a acceptable (safe) range

AHCAL Mechanicsabsorber structure (dynamic)

Absorber structure validation (earth quake)

not enough detailed Information for realistic simulation !

3 Hz -> swinging structure

7.6 Hz -> swinging submodules

24,5 Hz -> swinging interconnections

45 Hz -> swinging plates

AHCAL Mechanicsabsorber structure validation (dynamic)

conclusion:

• start with the modal analyses for the AHCAL absorber structure only

• the absorber plates starts to swing in a long frequency range

• the calculation time for single solutions are to long, we must think about the simplification of the 3D model

• we are far away to understand the overall behavior of the model

• the safe way would be, to validate the calculations with real structures

Status report AHCAL Mechanics Karsten Gadow CALICE Collaboration Meeting KEK, 19.04.2015 Studies of...

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