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ANSYS simulations for the Vacuum System . Index. Case Study Model Results Summary & Future Steps. Case Study – Subassemblies for analysis. Case 1: Vacuum Tank. CLIC prototype module Type 0. Case 2: Vacuum Network. Case 3: RF Network. Case 1: Vacuum Tank . - PowerPoint PPT Presentation
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Nick Gazis, CERN-BE/RF & NTU-Athens 1
ANSYS simulations for the Vacuum System
17 January 2011
Nick Gazis, CERN-BE/RF & NTU-Athens 2
Case Study Model Results
Summary & Future Steps
17 January 2011
Index
Nick Gazis, CERN-BE/RF & NTU-Athens 317 January 2011
Case Study – Subassemblies for analysis
CLIC prototype module Type 0
Case 1: Vacuum Tank
Case 3: RF NetworkCase 2: Vacuum Network
Nick Gazis, CERN-BE/RF & NTU-Athens 4
Case 1: Vacuum Tank
17 January 2011
Previously analyzed model (Z.Shah)
Differences to the previous analysis: i. Complete subassembly modelization;ii. Vacuum forces introduced;iii. Different element and meshing
options integrated;iv. Realistic modelization/simplification
of the bellows;v. No remote extrapolated forces;vi. Realistic supporting conditions.
Nick Gazis, CERN-BE/RF & NTU-Athens 5
Case 1: Vacuum Tank
17 January 2011
In need of bellow model simplification due to the complexity of the geometry:
i. Vacuum Force (via the mean diameter);ii. Bellow stiffness.
Before mentioned sizes calculated for the realistic bellow modelization (input form A. Samochkine & C. Garion).
Bellow convoluted part Equivalent Pipe Dm: diameter, Ep: thickness, Lb: length, E: material modulus of elasticityDm=Internal diameter+Height
convolution=(ID+OD)/2Crosse section: Sint=π*(Dm^2)/4Kax: Axial stiffness Section: Seq= π*Dm*Ep=Kax*Lb/E Thickness: Ep=(Kax*Lb)/(E*Dm*π)
Nick Gazis, CERN-BE/RF & NTU-Athens 6
Case 1: Vacuum Tank
17 January 2011
No use of “advanced size function” and “fine
meshing”
Different meshing settings were tested so as to succeed realistic results.
Use of “advanced size function” and “medium meshing”
~ 100 000 nodes ~40 000 elements
Model Built-up
Nick Gazis, CERN-BE/RF & NTU-Athens 717 January 2011
Deformations
Case 1: Simulation Results
17.5 μm of deformation, only due to vacuum forces
Equivalent model stresses < 50 MPa on the max deformation region
Nick Gazis, CERN-BE/RF & NTU-Athens 8
Summary of Accomplished Tasks:•Calculation of bellows simplification;•Simulation of the overall subassembly of case 1 (vacuum tank) for the vacuum forces.
Future Tasks & Testing:•Update of case 1 (vacuum tank) analysis with pump loads and vacuum network loads;•Simulation of case 2 (vacuum network) and case 3 (RF network);•Simulation of the overall model of the three presented cases (vacuum tank, vacuum network and RF network).
Summary & Future Steps
17 January 2011
Comments are always welcome!
Nick Gazis, CERN-BE/RF & NTU-Athens 9
Thank you!
9Nick Gazis, CERN-BE/RF & NTU-Athens17 January 2011
