Create Presentation
Download Presentation

Download Presentation

ANSYS simulations for the Vacuum System

Download Presentation
## ANSYS simulations for the Vacuum System

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**ANSYS simulations for the Vacuum System**Nick Gazis, CERN-BE/RF & NTU-Athens**Index**• Case Study • Model • Results • Summary & Future Steps Nick Gazis, CERN-BE/RF & NTU-Athens**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**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**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**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**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**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**Thank you!**Nick Gazis, CERN-BE/RF & NTU-Athens Nick Gazis, CERN-BE/RF & NTU-Athens 9