1. Berlin talk outline Draft 2 – 7 th March 2013

2. Introduction UK has recently started to systematically try and understand structural requirements and how to satisfy them. As resources are limited we are only investigating ideas that are compatible with: – Edge mounting – End insertion – Service modules – Low tilt angle staves.

3. Present areas of attention Requirements (Steve will talk later, so I will say very little…) Cylinder design (C Nelson) Interlink geometry (P Sutcliffe, W Lau, J Hill) Interlink layup (P Sutcliffe) Connection of interlink to cylinders (W Lau) Coordinate systems (I Wilmut) – Including inspection methodology

4. REQUIREMENTS Split section into 2 #1 End insertion etc Service supports Etc #2 SM work

5. Non-performance requirements The following requirements need to be observed by any solution we propose End insertion Removal of any stave with impact on minimum neighbouring staves Structure support the services and the cylinders/staves …

6. Performance Requirements Georg has discussed the structural requirements several times, these have now been incorporated in to the LoI. – Link to LoI Steve McMahon has started to look at these requirements with the aims of: – Making sure they are correct and unambiguous – Understanding what the mean for the various sub- systems. – Develop working specifications

7. What Steve is thinking… Not sure what to put here – maybe a summary of Steve’s talk – perhaps drop the slide Would quite like to describe planned outcome of work.

8. STRUCTURE DESIGN

9. Aims As the requirements are still developing we are not yet trying to design final structure. Instead we are exploring the parameter space with the aim of understanding which choices are most compatible with specific requirements. In all cases we are expressing performance in terms of 1 st mode and mass

10. Parameters Skin layup Influence of flanges Stiffness and number of stiffening rings Cored vs single skin cylinders Number of interlinks Interlink stiffness (cylinder to cylinder) Local stiffness (area beneath locking point foot)

11. Lots of tables and slides from Chris… GV wants both closed and open cylinders

12. INTERLINKS

13. Background At LBL last year we Joe Silber gave a very good talk on Star experiences of bolted joints. These were very interesting (and are summarised on following slides) We believe that from an integration standpoint one interlink per stave is the right way forward. For this to work we need to understand the following areas…

14. Aims and investigations Bolted joints – Are we relying on friction or pin bolts? – How many bolts? – How big? What material? Interlink design – Shape – Where to put the material – How to interface to cylinders – How to maintain overall Z stiffness

15. Case for many interlinks (few slides) Justification of starting point: – Good integration Material – TJ suggests that a number for total pipe material in service gap as material metric – GV proposes reference to present SCT design

16. Interlink design (several slides) Tims testing of bolts – free-free info. Peters modelling of links – on work of next couple weeks. Wings bolt area slides. Friction work by Wing

17. DIMENSIONING & INSPECTION (OR COORDINATE SYSTEMS)

18. Dimensioning scheme We recognise that whilst the dimensioning scheme will not make the system any more or less accurate, it can make achieving the accuracy a lot simpler. What we want to do is make a dimensioning scheme that does not accumulate errors. Where do we anchor the stave… maybe another talk.

19. Slides showing ideas…