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SiD Platform Deformation Studies. John Amann ILC Mechanical Engineering 11/21/06. Disclaimer: The designs and models for the detector, supports, and mobile platform used for the ANSYS simulations are crude at best and simplified to speed computation.

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Sid platform deformation studies

SiD Platform Deformation Studies

John Amann

ILC Mechanical Engineering

11/21/06


Disclaimer:

The designs and models for the detector, supports,

and mobile platform used for the ANSYS simulations

are crude at best and simplified to speed computation.

The actual designs and subsequent performance may

differ vastly. Scales are exaggerated on ANSYS

contour plots for visual effect.


SiD SolidEdge 3D Model

Detector, supports, and

platform one complete

unit made of A36 steel.

Young’s Modulus

=30e6 PSI

Poisson’s Ratio

=.27


36 Air Caster Platform SolidEdge 3D Model

Air casters, steel beams,

and plates one complete

unit made of A36 steel.

Young’s Modulus

=30e6 PSI

Poisson’s Ratio

=.27

Both units imported into

ANSYS as IGS and

fused into one volume.


Platform Bending Along Beam Axis

Detector and platform

assembly placed on rigid

20x20x5m A36 steel IR

floor, restrained all DOF.

Surface contact with static

friction modeled.

No gravity.

313 PSI applied here.

282 PSI applied to row of

6 air casters at front and

back edges of platform.

Max y displacement

= 3.40mm.


Platform Bending Along Beam Axis Front View

Detector y displacement

= 0.70mm.



Platform Bending Transverse to Beam Axis

313 PSI applied here.

282 PSI applied to row of

6 air casters at right and

left edges of platform.

Max y displacement

= .96mm.


Platform Bending Transverse Beam Axis Front View

Detector y displacement

= 0.70mm.


Platform Twisting

313 PSI applied here.

282 PSI applied to 3 air

casters at front left

corner and back right

corner of platform.

Max y displacement

= 1.40mm.


Platform Twisting Front View

Detector y displacement

= 0.71mm.


Platform Lifted From Left Side

313 PSI applied here.

282 PSI applied to row of

6 air casters at left edge

of platform.

Max y displacement

= 0.88mm.


Platform Lifted From Left Side - Front View

Detector y displacement

= 0.71mm.


Semi-Realistic SiD Support Structure

A36 Steel W Shape I-Beams

(~1m x .5m)

Detector Rests on I-Beams


Platform for Semi-Realistic Sid Support Structure

A36 Steel W Shape I-Beams

A36 Steel Web Plates

.75m Radius Air Casters

A36 Steel .125m Base Plates

A36 Steel .125m Top Deck

(not shown)

A36 Steel .25m Bar Stock


Platform Twisting

313 PSI applied here.

Detector y displacement

= 0.78mm


Platform Twisting

282 PSI applied to

opposite corners.

(8 ACs)

Y max displacement

= 3.74mm.


Platform Bending Along Beam Axis

313 PSI applied here.

Detector y displacement

= 0.83mm.


Platform Bending Along Beam Axis

282 PSI applied to front

and back rows.

(18 ACs)

Y max displacement

= 3.20mm.


Platform Bending Transverse Beam Axis

313PSI applied here.

Detector y displacement

= 0.68mm.


Platform Bending Transverse Beam Axis

282 PSI applied to all

four corners.

(16 ACs)

Y max displacement

= 6.65mm


Platform Bending Transverse Beam Axis

313 PSI applied here.

Thinner yoke to

reduce stiffness

of assembly.


Platform Bending Transverse Beam Axis

282 PSI applied to

four corners.

(16 ACs)


Platform Bending Transverse Beam Axis

Yoke deforms under

313 PSI load.

Detector y displacement

= ??.

Platform y displacement

= 0.45 – 1.1mm


Platform Bending from Left Edge

5cm steel floor plate on 5m concrete foundation.

282 PSI applied to left side.

(12 ACs)

313 PSI applied here.


Platform Bending Transverse Beam Axis

Asymmetric distortion.

Concrete floor restrained all DOF

at bottom surface.

Steel plate restrained all DOF

at all sides.


Platform Twisting

313 PSI applied here.

282 PSI applied to opposite corners.

(8 ACs)


Platform Twisting

Asymmetric distortion.


Platform Bending Transverse Beam Axis

Comparison of “Warning” Mesh Elements vs. Distorted Plate


Platform Twisting with Gravity

Want to investigate

distortion of central

barrel. Must use global

gravity vs. 313 PSI.

Coarse mesh for fast

computation = circles

become polygons.


Platform Twisting with Gravity

Displacement is uniform

axially across central

barrel.

Distortion of barrel

geometry due to

coarse mesh.


Platform Twisting with Gravity

Displacement is

uniform transversely

across central

barrel.

Displacement of

platform structure

= -.49mm to

+1.67mm.


Work In Progress……

  • Add details of steel yoke plate structure to detector model.

  • (CMS style or BaBar style?)

  • Create SolidEdge model of solenoid/calorimeter.

  • Simulations with more realistic models and cyclical loading of IR floor.


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