Methods and apparatus for shape transformation of multi-linkage structure
A modular structure may comprise multiple mechanical linkages. The structure may undergo two-dimensional or three-dimensional shape transformations, such as bending, twisting, shearing, uniform scaling, and anisotropic scaling. These shape transformations may be actuated by applying force to one or more specific locations in the structure. Each of the linkages in the modular structure may comprise a four-bar linkage. The exact shape transformation that the structure undergoes may be determined by the type and location of the linkages in the structure.
1. A physical structure, comprising:
a set of multiple linkages, wherein:
at least one of the linkages in the set is coupled to at least one other linkage in the set; and
the set includes at least two types of four-bar linkages selected from a group consisting of:
basic linkages, shear linkages, uniform scaling linkages, bend linkages, twist linkages, and anisotropic scaling linkages,
wherein the at least one linkage in the set is coupled to said at least one other linkage in the set by a part of a first rigid link, a part of a second rigid link, the first and second rigid links each being at least part of one of bars from at least one of the respective coupled linkages.
2. The physical structure of claim 1 , wherein the structure is configured to undergo a three-dimensional shape transformation when force is applied to one or more parts of the structure.
3. The physical structure of claim 1 , wherein:
the structure is configured to undergo a three-dimensional shape transformation when force is applied to one or more parts of the structure; and
the shape transformation is reversible.
4. The physical structure of claim 1 , wherein the set includes both basic linkages and bend linkages.
5. The physical structure of claim 1 , wherein:
the set includes both basic linkages and bend linkages; and
each bend linkage in the set is coupled to at least one basic linkage in the set.
6. The physical structure of claim 1 , wherein:
the set includes both basic linkages and bend linkages;
each bend linkage in the set is coupled to at least one basic linkage in the set; and;
the structure is configured to undergo three-dimensional bending when force is applied to one or more parts of the structure.
7. The physical structure of claim 1 , wherein the set includes both basic linkages and twist linkages.
8. The physical structure of claim 1 , wherein:
the set includes both basic linkages and twist linkages; and
each twist linkage in the set is coupled to at least one basic linkage in the set.
9. The physical structure of claim 1 , wherein:
the set includes both basic linkages and twist linkages;
each twist linkage in the set is coupled to at least one basic linkage in the set;
and;
the structure is configured to undergo three-dimensional twisting when force is applied to one or more parts of the structure.
10. The physical structure of claim 1 , wherein the multiple linkages in the set are spatially arranged in a tessellated array.
11. The physical structure of claim 1 , wherein:
each linkage in the set shares a joint in common with said at least one other linkage in the set; and
each linkage in the set is coupled to at least one other linkage in the set at a rotational point the joint is included at the rotational point corresponding to said each linkage and said each of the one or more other linkages in the set.
12. The physical structure of claim 1 , wherein the set comprises a tessellated array of single-level uniform scaling linkages.
13. The physical structure of claim 1 , wherein the set comprises a tessellated array of bi-level uniform scaling linkages.
14. The physical structure of claim 1 , wherein the set comprises a tessellated array of anisotropic scaling linkages.