team: wolfgang burkert, haimo jöhri, uwe barth mechanical precision and vibration behavior of...
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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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
GIRDER
JACKS
FLOOR
SUPPORTS
COMPONETS
SETUP of Mechanical structures 250 MeV
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
4700mm
820mm/ 920mm
1200mm
570mm
820mm
mass 3800kg /4400kg
Girder Dimension 250 MeV
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
Girder Dimension Fabrication
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
Reference area
Clamping element
Distance block orDriving wedge
Screw for lifting
J.Haimo
Support for Components
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
Lifting Spreader 7.5 tons
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
– 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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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
Modus Frequenz [Hz]
1 58
2 102
3 112
4 140
5 171
6 191
• 3 Feet downstream + Load
Eigenfrequency analysis of mechanical supports
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
• 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
Eigenfrequency analysis of mechanical supports
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
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
Eigenfrequency analysis of mechanical supports
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Johan.Wickström GFA-ATK, Paul Scherrer Institute Switzerland
• 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