Truss designs, materials, and fabrication
A truss is disclosed in which rigid longitudinal members define a frame and flexible connecting members permit the truss to collapse into a stowed configuration or expand into a deployed configuration.
1. A collapsible truss, comprising:
a plurality of frames are longitudinally positioned along a longitudinal length of the collapsible truss, wherein each of the plurality of frames is defined by a plurality of battens;
a plurality of rigid longerons coupling adjacent ones of the frames, wherein the adjacent frames and the connecting longerons between the adjacent frames define a cell;
a plurality of flexible nodes flexibly coupling the longerons on opposing sides of the flexible node;
a plurality of linearly extendable diagonals coupling the adjacent frames; and
a plurality of rigid nodes rigidly coupling the longerons on opposing sides of the rigid nodes.
2. The collapsible truss of claim 1 , wherein each of the plurality of flexible nodes is created by a flexible member between one of the plurality of rigid longerons and one of a plurality of nodes.
3. The collapsible truss of claim 2 , wherein the flexible member is a longitudinal member of curved, constant-thickness cross section.
4. The collapsible truss of claim 2 , wherein the plurality of rigid nodes includes a rigid attachment to at least one of the battens and a flexible attachment to at least one of the battens.
5. The collapsible truss of claim 2 , wherein the extensible diagonals are flexibly coupled to the adjacent frames.
6. The collapsible truss of claim 5 , wherein the longerons extending on opposing sides of the rigid node are coaxially aligned.
7. The collapsible truss of claim 5 , wherein the longerons extending on opposing sides of the flexible node are coaxially misaligned.
8. The collapsible truss of claim 2 , wherein the plurality of flexible nodes includes a rigid attachment to at least two of the battens.
9. The collapsible truss of claim 8 , further comprising transverse diagonals coupled between the adjacent frames.
10. The collapsible truss of claim 9 , wherein each of the plurality of frames are rigid structures and do not deform, and each of the rigid longerons are rigid components and do not deform.
11. The collapsible truss of claim 10 , wherein the plurality of linearly extendable diagonals comprise telescoping tubes.
12. The collapsible truss of claim 11 , wherein the longerons, battens, and telescoping tubes comprise composite tubes.
13. The collapsible truss of claim 12 , wherein the composite material comprises a carbon fiber-epoxy matrix.
14. The collapsible truss of claim 13 , wherein at least ten of the longerons are positioned between the adjacent frames.
15. The collapsible truss of claim 14 , wherein the longerons are not equally positioned along a width of the truss, but are localized adjacent corners of the truss.
16. The collapsible truss of claim 15 , wherein the plurality of flexible nodes comprise indentations in which the flexible member is attached, wherein the indentation includes a shaped surface comprising two inwardly convex portions.
17. The collapsible truss of claim 16 , wherein the indentations comprise a closed end, wherein a concave curved surface of the flexible member faces the indentation closed end.