# ANSYS simulations for the Vacuum System - PowerPoint PPT Presentation

ANSYS simulations for the Vacuum System

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ANSYS simulations for the Vacuum System

## ANSYS simulations for the Vacuum System

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1. ANSYS simulations for the Vacuum System Nick Gazis, CERN-BE/RF & NTU-Athens

2. Index • Case Study • Model • Results • Summary & Future Steps Nick Gazis, CERN-BE/RF & NTU-Athens

3. Case Study – Subassemblies for analysis Case 1: Vacuum Tank CLIC prototype module Type 0 Case 2: Vacuum Network Case 3: RF Network Nick Gazis, CERN-BE/RF & NTU-Athens

4. Case 1: Vacuum Tank • Differences to the previous analysis: • Complete subassembly modelization; • Vacuum forces introduced; • Different element and meshing options integrated; • Realistic modelization/simplification of the bellows; • No remote extrapolated forces; • Realistic supporting conditions. Previously analyzed model (Z.Shah) Nick Gazis, CERN-BE/RF & NTU-Athens

5. Case 1: Vacuum Tank • In need of bellow model simplification due to the complexity of the geometry: • Vacuum Force (via the mean diameter); • 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 elasticity Dm=Internal diameter+Height convolution=(ID+OD)/2 Crosse section: Sint=π*(Dm^2)/4 Kax: 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 Different meshing settings were tested so as to succeed realistic results. No use of “advanced size function” and “fine meshing” Use of “advanced size function” and “medium meshing” Model Built-up • ~ 100 000 nodes • ~40 000 elements Nick Gazis, CERN-BE/RF & NTU-Athens

7. Case 1: Simulation Results Deformations • 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 & Future Steps • 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). Comments are always welcome! Nick Gazis, CERN-BE/RF & NTU-Athens

9. Thank you! Nick Gazis, CERN-BE/RF & NTU-Athens Nick Gazis, CERN-BE/RF & NTU-Athens 9