Space Frame Telescope Structures for SNAP: Part II

1
Space Frame Telescope Structures for SNAPPart II

• Bruce C. Bigelow
• University of Michigan
• Department of Physics
• 8/26/04

2
Space Frames for SNAP

• Status
• Determinate structures for TMA-63 presented
  7/28/04
• Two new structure concepts under development
• Both are indeterminate
• Both use TMA-65 optics
• Shutters, star trackers, tertiary support added
  to models
• Conceptual design of nodes (joints) underway

3
Indeterminate structure PR-10

• Features
• Indeterminate design (over-constrained)
• Instrument section non-symmetric WRT OTA
• Instrument section has 3-fold symmetry between
  tertiary and focal plane
• Lots of room for star-trackers, etc.
• Fewer nodes and struts than PR-11

4
Pr-truss10
5
Pr-truss10
6
Pr-truss10
7
Indeterminate structure PR-11

• Features
• Main sections have 3-fold symmetry
• Instrument section has 3-fold symmetry for
  tertiary and focal plane
• More nodes and struts than PR-10
• More complicated nodes than PR-10
• Lots of room for star-trackers, etc.

8
Pr-truss11
9
Pr-truss11
10
Pr-truss11
11
Indeterminate structures

• Conclusions
• Indeterminate structures for TMA-65 demonstrated
• Most of cost, time, effort will go into node
  design
• Recent input from LBL composites expert
  Eric Anderssen
• Get more input from manufacturers
• Work on nodes next!