SVD Mechanics in Pisa Filippo Bosi INFN-Pisa on behalf of the SVT - - PowerPoint PPT Presentation

SVD Mechanics in Pisa

Filippo Bosi

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015 1

INFN-Pisa

• n behalf of the SVT Group

• L5 prototype module Tests

– Module Metrology – Vibrational Analisis (preliminary)

• Origami cooling tube attachment

– First Conceptual Design

Outline

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015 2

Module Support

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• The support for the test has been realized with the same fixation

system, the same material and same mechanical precision like foreseen in the experiment conditions.

• The support was designed with low weight and high inertia in order to

get the maximum K equivalent factor. The goal was to assure high level of resonance frequency for the support respect to the wich espected for the module, in order to avoid any additional forcing on the module itself.

• The purpose of the test was to know the natural frequency of the

module (the modal analysis) in relation to the the shipping and experiment conditions .

Module Support

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015 4

Endring Block Backward AISI 440 silicon cross for reference plane XY Reference Z plane

AISI440 Aluminum Alloy ALCOA5000

Endring Block Forward AISI 440

Module Test

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Mechanical/geometrical tollerance like foreseen in experiment

Module Test

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Pin Support for reference cross of XY plane

End Ring Block

Module Metrology

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015

A module metrology has been realized before the test in order to check any geometric variation durng the test.

CMM Mitutoyo BHN 607 with no contact method ( precision on Z coordinates with focus tecnique + 5 micron ) .

Module Metrology

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N.15 cross reference on the sensors region. XY System reference

System reference

N.4 cross reference on the Hybrid.

Ladder Vibrational Test

Vibrational Test programm:

• Sine test cycle up to 1500 Hz on vertical/horizzontal axes
• Sine sweep 20/1500 Hz in continuos way to measure the modals /

resonance frequency of the ladder;

• Random test according to a random vibration environment of shipping

(truck and flight transportation)

• Shock test

7

• Test Shaker : Tyra-TV5220
• Shaker Controller: Data

Physics-Signal Star Vector

• Dynamic Shaker max load 8

kg at 8 G up to 2000 Hz Accelerometer: KS777MMF weight 0,5 gramms

Module Vibrational Test

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015

1) N.3 Test performed on the support at 0.6 G with continuos sweep from 20 to 1000Hz. Accelerometer positioned near the Endring Block with adesive tape . Evidence of resonance at 920 Hz. 3) N.4Test preformed on the system support+module at 0.6 G with continuos sweep from 20 to 1000 Hz. Accelerometer positioned in central/lateral module region with adesive tape. Evidence of dinamic behavior around 120 Hz. Other instability around 300, 500, 700 and 800 Hz 2) N.1 Test performed on the system support+module at 0.2 G with continuos sweep from 20 to 1000 Hz. Accelerometer positioned in central module region with adesive tape. Evidence of dinamic behavior at around 120 Hz. Other instability around 300, 500, 700 and 800 Hz

Support Vibrational Test

F.Bosi, BELLE2 VXD Workshop, Trieste,

• Sept. 10th 2015

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Support Vibrational Analysis 0,6 G Resonance 920 Hz

Vibrational Module Test

F.Bosi, BELLE2 VXD Workshop, Trieste,

• Sept. 10th 2015

12

q

Module Vibrational analysis 0,2 G

Module Vibrational Analysis 0,6 G

Vibrational Module Test

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Metrology Results

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Some strong geometry variation on the z coordinate (about 250 micron) while the variation in X,Y is below 100 micron.

Random Vibrational Test

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Test: Three consecutive sequence of random vibration profile (30 minutes for international flight @ 0.52 G rms truck - 1,06 G rms Air - 0.52 G rms truck )

10-100 Hz 4-20 Hz

Vibration Module Test

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015 16

• We performed only a preliminary test on the module on the vertical

direction.

• We have to repeat the test on the horizzontal direction at 0.2 G with a

special mechanichal support to position the module respect the shaker.

• Altough there is a strong variation in the module geometry long Z axes

(*), but considering the stress of the test at 0,6 G the general impression is that the module is anyway robust and stiff . (*) ( strong deformation in z coordinates in the region of the Hybrid could also due to a hard handling for a problem accors during one demounting module operation) .

• To perform the random vibrational test we think to follow the FedEx

specification, using the transport box like support for the test.

Origami tube attachment

F.Bosi, BELLE2 VXD Workshop, Trieste,

• Sept. 10th 2015

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For the Origami cooling tube attachement is usefull to make use of the Ladder Mount mechanical set in KEK + some specific support to hold the cooling tube set in hits specific shape: The sistem could be realized by:

• A cradle support able to keep the cooling tube set in a shape

consistent with the geometry defined by the clamp position on the ladder on the SVD;

• A mechanical system, (two arm support like), supported by the tower
• f ladder mount micropositioner, able to hold the cradle support and

to move it on the expected position above the SVD, exactly at the top

• f the ladder clamp;
• At this point by hand or with a specific pusher tool, is possible to close

any single arm of the cooling set tube on the ladder clamp.

Cooling Tube Attachment

F.Bosi, BELLE2 VXD Workshop, Trieste, Sept. 10th 2015 18

• Because is not possible to position the cooling tube set by only a rigid

movement we need a system that allow the cradle to rotate respected a precise axis (coaxial at one arm of the cooling tube) and wrap around SVD without touching component.

• The cooling tube is hold in position on the cradle by vacuum chuck and/or

clamping system that leave free the cooling tube surface in contact with the ladder clamp. Vacuum chuck cradle support

Origami tube attachment

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Cradle Support Two Arm Support Ladder Mount Positione tower Cooling tube Axis of rotation Cradle support: rotational final position

Origami Cooling tube Attachment

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Cradle support: rotational final position Cradle Support Axis of rotation

Cooling Tube Attachment

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Cradle support: final rotational position Cradle support: initial rotational position Rotational axis

Cooling tube attachment

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ction Position Axis of rotation Final position cooling tube position after rotation ; distance respect to the ladder clamp last ladder clamp firstr ladder clamp

Origami tube attachment

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This distance is not that considered in the present C.D. (2mm larger)

Conclusion

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• The Vibrational test on the ladder L5 has started , we have

preliminary results and we need to pass to the random test; for this test need a final transport box

• The conceptual design of the Origami Cooling tube is started, we

can produce a prototype of Cradle Support and test the reliability

• f the chuck system
• For the B2Gm the design shoul be engineered and ready for

prototype realization