1 / 15

BaBar IFR Upgrades

BaBar IFR Upgrades. An FEA Study of the Effects of Adding Brass Plates in the IFR. Present BaBar Configuration. FEA (Finite Element Model) of BaBar As-built with Doors Off. The Problem. Removal of the gap and forward corner plates provides clear access to components in the barrel.

kaden-head
Télécharger la présentation

BaBar IFR Upgrades

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. BaBar IFR Upgrades An FEA Study of the Effects of Adding Brass Plates in the IFR LST Mechanical Design Review - SLAC

  2. Present BaBar Configuration FEA (Finite Element Model) of BaBar As-built with Doors Off. LST Mechanical Design Review - SLAC

  3. The Problem • Removal of the gap and forward corner plates provides clear access to components in the barrel. • Will removal of the gap and corner plates deform the barrel to the point that the gap and corner plates could not be re-assembled? LST Mechanical Design Review - SLAC

  4. Analysis • Determine with Finite Element Analysis (FEA) whether the deformation of the barrel will affect the re-assembly of the gap and corner plates. LST Mechanical Design Review - SLAC

  5. BaBar FEA Model J. Hodgson (SLAC) created a quarter-model of BaBar for the original BaBar structural analysis. LST Mechanical Design Review - SLAC

  6. New FEA Model - #1As-built • Present Loads: • Solenoid (14000 kg) – 4 points inside lower side plates • DIRC (8000 kg) – 14 points from the top & bottom gap plates & on 100 & 50-mm IFR plates • Calorimeter (30000 kg) – 4 pts. at outside of mid-plane corner plates • Flux bars (8000 kg) – at each corner • No end plug weight here LST Mechanical Design Review - SLAC

  7. New FEA Model - #2Upgrade Configuration • Upgrade Configuration Loads: • Solenoid (14000 kg) – 4 points inside lower side plates • DIRC (8000 kg) – 14 points from the top & bottom gap plates & on 100 & 50-mm IFR plates • Calorimeter (30000 kg) – 2 pts. on bwd. end on outside of mid-plane corner plates and 6 pts. on fwd. end on earthquake wide flange supports • Flux bars (8000 kg) – at each corner • No end plug weight here LST Mechanical Design Review - SLAC

  8. New FEA Model - #2Upgrade Configuration • Consider the following extreme scenario: • All Forward corner plates are removed • Top & bottom gap plates on Forward end are removed • Top & bottom gap plates on Backward end are left on • All other center gap plates are removed (were not part of original model) LST Mechanical Design Review - SLAC

  9. New FEA Model - #2Upgrade Configuration • Brass loading: • Six layers of brass plate segments are installed in all sections • Layers 5, 7, 9, 11, 13, 15 LST Mechanical Design Review - SLAC

  10. FEA Model 2 Consider von Mises stresses: – Max is 18 ksi (occurs on bolts attaching wedge to cradle) (units are in Pa) LST Mechanical Design Review - SLAC

  11. FEA Model 2 Consider von Mises stresses without the wedge-cradle bolts: – Max range is ~ 10 ksi (units are in Pa) LST Mechanical Design Review - SLAC

  12. FEA Model 3 - Deflections • Model 3 = Model 2 (Upgrade) – Model 1 (As-built) • Consider the relative change in position by comparing the vector sum of x,y,z nodal deflections • Max overall relative change in position is less than 0.3 mm in the area of the wedge-cradle bolts units are in (m) LST Mechanical Design Review - SLAC

  13. FEA Model 3 - Deflections The bolt positions on the corner and gap plates are shown here. LST Mechanical Design Review - SLAC

  14. FEA Model 3 - Deflections • Now consider only the nodal points on the x-y plane of bolt holes for corner plates and the ends of the side plates • Fwd end: max change in relative position is ~ 0.2 mm • Bwd end: max change in relative position is ~ 0.3 mm LST Mechanical Design Review - SLAC

  15. Results • Results suggest that the maximum relative movement of the bolt holes and internal component support points on the side plates on the Forward End is ~ 0.3 mm. • This also suggests that preliminary results from a year ago are correct: Removal of the gap and forward corner plates to gain access to barrel components seems like a viable option. LST Mechanical Design Review - SLAC

More Related