Abstract
Deployable structures have applications in many industries. This thesis
presents a detailed analysis of the kinematics, analytical geometry and deployment
of a six-sided mechanism. This is done using both computer algorithms
and physical models. The six-sided mechanism has two distinct stable
configurations. It can either be an expanded quadrilateral frame or
a folded up compact bundle. This mechanism has special characteristics
that allow it to violate the mobility constraints, mainly the placement of
joints along a plane of symmetry within the structure. It is possible
to construct various different kinds of six-sided foldable mechanisms by
varying their construction parameters and then to categorize them into families
which have similar properties. The various relationships between the construction
variables of the mechanism are mapped using a computer program based on describing
rotations using hyper complex numbers, specifically hyper complex numbers
of rank four called quarternions. It is also possible to create larger
deployable structures using the six-sided mechanism as a basic unit. A
new construction technique is developed which allows this task to be done
in a more efficient and easy manner so that the mechanism can be specifically
tailored for a particular application.
[Cambridge University | CUED | Structures Group | Geotechnical Group]