team: wolfgang burkert, haimo jöhri, uwe barth

Team: Wolfgang Burkert, Haimo Jöhri, Uwe Barth

Mechanical precision and vibration behavior of mechanical supports

Johan Wickström GFA-ATK

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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland

BRIDGE

AARE

PSI XFEL LAYOUT

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GIRDER

JACKS

FLOOR

SUPPORTS

COMPONETS

SETUP of Mechanical structures 250 MeV

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GIRDER

JACKS

FLOOR

SUPPORTS

COMPONETS

floor unlevel +-10mm

pre positioning +-1mm

machined precision longitudinal 0.01mm/1mvertical +-0.1mm

precision from alignment driving wedge or distance block 0.01mm

stability of component structure

SETUP of Mechanical structures General

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4700mm

820mm/ 920mm

1200mm

570mm

820mm

mass 3800kg /4400kg

Girder Dimension 250 MeV

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Johan.Wickström GFA-ATK, Paul Scherrer Institute SwitzerlandW.Burkert

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Girder Dimension Fabrication

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Spherical contact head•Vertical adjustment•Horizontal adjustment1 turn = 0.3mm

• Standard driving wedge•Compact and massive design•Fixation of movement possible

Girder Jack

J.Haimo

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Reference area

Clamping element

Distance block orDriving wedge

Screw for lifting

J.Haimo

Support for Components

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Height: 20mm +/- 0.5mm

1 turn = 0.1mm adjustment of height

Scale : 0.1mm / mark

Scale : 0.01mm / mark

Footprint : 38 x 65mm

J.Haimo

Driving Wedge

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Lifting Spreader 7.5 tons

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Why mineral Cast ? – high damping properties expected, non homogenous material– relatively high mass vs. load change good for many setups

– cost effective in mass production (no high temperature) about 3 weeks delivery with existing mould

• one wooden mould gives ~10 girders• one steel mould gives +100 girders

– surfaces can be grinded >> precision 0.01mm/1m length– no local stresses introduces by machining

WEAK Points– fragile edges - corners– minimal wall thickens +80mm– mould costs during prototyping– unknown factors?

design Today 250 MeV – PSI XFEL

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– estimate eigenfrequency and deformations of girder – 3 feet or 4 feet solution considered– several feet locations considered– target eigenfrequency above 40 Hz– sacking deformation of low relevance since machining done on

support points– sacking from 10-20μm

Eigenfrequency analysis of mechanical supports

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Modus Frequenz [Hz]

1 58

2 102

3 112

4 140

5 171

6 191

• 3 Feet downstream + Load


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• 4 Feet downstream + LOAD

Optimal Feet DistributionFirst mode 128 Hz

Modus Frequenz [Hz]

1 102

2 117

3 135

4 155

5 190

6 190


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analysis Summary– Deformation not important can be machined out– Clearly 4 feet more stable and symmetric behavior– Component support also need optimizing– Feet location important– Lifting feet dose only bring advantage if beam lower down– Real measurements will prove how the complete setup will

perform


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• Development of mechanical supports is well underway, during the spring we will have a confirmation of the mineral cast material for the functionality as a girder. As well as the functionality of the jacks, supports and the alignment wedges.

• FEM eigenfrequency calculations should be done for the complete chain of mechanical supports + possible confirmation by measurement - magnets, RF structures, diagnostics, undulators, laser transfer, etc

• For PSI-XFEL – check beam distance to supports, beam height, floor trench for girder, 3 – 4 feet, feet location handling and transport questions - time and tooling, tunnel size

• Further comparison to other potential material like SiC should be carried out, possibly in scaled down size

Thanks to All the great colleges that work together for this interesting and challenging development!

Summary

team: wolfgang burkert, haimo jöhri, uwe barth

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