Deployable, ultra-stowable truss for space applications
Implementations of the disclosed subject matter provide a system including a truss that may have a plurality of bays. Each bay may include a plurality of longerons disposed in a longitudinal direction, a plurality of battens disposed in a transverse direction, and at least two longitudinal struts that are coupled by hinges that are configured to allow the at least two longitudinal struts to fold towards an interior of each bay of the truss, where at least one batten may connect and separate at least one longitudinal strut. The longitudinal struts, the longerons, and the battens may be connected to form the bay, where each side of the bay may be formed from two battens that are joined end-to-end, and where at least some of plurality of battens respectively separate at least some of the plurality of longerons. The truss may be configured to be stowed longitudinally and transversely.
1 . A system comprising:
a truss comprising a plurality of bays, where each bay comprises:
a plurality of longerons disposed in a longitudinal direction, including a first longeron, a second longeron, and a third longeron, each having at least two longitudinal struts with hinges connecting the longitudinal struts; and
a plurality of battens disposed in a transverse direction, wherein the plurality of battens comprise top battens and side battens that are connected to form a triangle, wherein two of the top battens connect the first longeron and the second longeron, wherein the side battens connect with the first longeron, second longeron, third longeron, and the top battens, and wherein the top battens and the side battens are configured with hinges, with the hinges of the top battens being configured to allow the top battens to fold in an outwardly convex manner,
wherein the at least two longitudinal struts of the first longeron, second longeron and the third longeron are coupled by hinges that are configured to allow the at least two longitudinal struts to fold towards an interior of each bay of the truss,
wherein the at least two longitudinal struts, the plurality of longerons, and the plurality of battens are connected to form the bay, wherein each side of the bay is formed from two of the side battens that are joined end-to-end, and
wherein the side battens and top battens respectively separate at least some of the plurality of longerons, and
wherein the truss is configured to be stowed longitudinally.
2 . The system of claim 1 , wherein the truss is configured to be stowed longitudinally by folding the hinges connecting the longitudinal struts so that a first set of battens of the plurality of battens disposed at a first end of the bay are stacked adjacent to a second set of battens disposed at a second end of the bay.
3 . The system of claim 1 , wherein the truss has a length and a cross section, where the cross-section changes along the length of the truss.
4 . The system of claim 1 , wherein at least one selected from the group consisting of: the hinges of the top battens, and the hinges of the side battens have an axis of rotation that is parallel to the longitudinal direction.
5 . The system of claim 1 ,
wherein at least some of the plurality of longerons comprise top longerons and base longerons, including the first longeron and the second longeron.
6 . The system of claim 5 , wherein two of the top battens connect two of the top longerons.
7 . The system of claim 6 , wherein the two top battens are connected via a hinge that is offset from a centerline in a transverse direction internal to the truss.
8 . The system of claim 1 , further comprising:
a plurality of tensioned diagonals disposed on external faces of each bay of the plurality of bays of the truss.
9 . The system of claim 8 , wherein at least one of the plurality of tensioned diagonals comprises: a first spring having a first spring constant, and a second spring having a second spring constant, wherein the second spring constant is a higher value than the first spring constant.
10 . The system of claim 1 , wherein the plurality of longitudinal struts comprises a plurality of top longitudinal struts and a plurality of side longitudinal struts,
and
wherein the side battens are connected to the top longitudinal struts and the side longitudinal struts via hinges that have axes of rotation that are parallel to the longitudinal direction.
11 . The system of claim 10 , wherein:
a valley hinge connects at least two of the side battens, at least two of the plurality of battens are connected to one another at the first longeron, where the connection is via a hill hinge,
wherein the truss is configured to be stowed by folding the hill hinge and valley hinge so that at least the two side battens, at least some of the plurality of battens, and at least some of the plurality of longerons package against one another.
12 . The system of claim 1 , wherein when the truss is folded, one or more battens of the plurality of battens are uncovered and are configured to have one or more hardware elements mounted to the one or more uncovered battens.
13 . The system of claim 12 , wherein the one or more uncovered battens are configured to mount at least one selected from a group consisting of: a solar array, and an antenna.
14 . The system of claim 12 , wherein one or more battens for each bay of the plurality of repeating bays are configured to be external during stowage and deployment.
15 . The system of claim 1 , wherein at least one of the plurality of battens extends beyond a junction with at least one of the plurality of longerons.
16 . The system of claim 1 , further comprising at least one linear actuator coupled to one or more of the plurality of longerons to control a length of the one or more longerons.
17 . The system of claim 1 , further comprising:
a sequencing mechanism configured to deploy one or more of the plurality of bays, one at a time, in a longitudinal direction.
18 . The system of claim 1 , wherein at least some of the plurality of battens are arranged between a first base transverse hinge and a second base transverse hinge and a top transverse hinge, wherein a distance between the first base transverse hinge, the second base transverse hinge, and a top transverse hinge remains constant during stowing.
19 . The system of claim 18 , wherein the distance is equal in both a transversely stowed configuration and a transversely deployed configuration.