Space Frame Telescope Structures for SNAP: Part II

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Presentation transcript:

Space Frame Telescope Structures for SNAP: Part II Bruce C. Bigelow University of Michigan Department of Physics 8/26/04

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

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

Pr-truss10

Pr-truss10

Pr-truss10

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.

Pr-truss11

Pr-truss11

Pr-truss11

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!