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Retraction System
The center piece of this design is the Kresling folding pattern. A robust, origami driven folding pattern that allows for material to be expanded and contracted to small volumes. The design requirements called for the contraction phase to take up the least amount of volume possible. After exploring many different geometrical ideas, the Kresling folding pattern achieved the least amount of volume necessary when in the contracted stage. This pattern also allowed for high degree of stability when compared to other ideas that the design team analyzed.
Origami Driven Solution: Kresling Folding Chute
Due to the unique challenge that this project presented, a key consideration towards volumetric constraint needed to be accounted for when building this design. More specifically, the chute needed to expand and contract as much as possible without having an affect on flight dynamics. The volumetric constraint was addressed by exploring the Kresling folding pattern, an origami type construction being studied in materials science.
Origami inspired collapsing mechanism
>93% collapsibility
Structurally rigid, preventing pendulum oscillation
Retraction: Driven Motor/Pulley System
Due to the already complex nature of design with respect to the chute, the pulley system was designed to maintain simplicity as to not over complicate the general build of the project. Different winch type apertures were explored, but it was determined that a motor/2-shaft pulley system would be adequate to complete this basic push button open loop type operation.
Design Features:
Spring like expansion without oscillations
Retraction of cables by pulleys fixed to two shafts interface by a 12v DC motor for torque
Material dependent collapsibility
Modularity + Fabrication benefits
Can laterally deform (absorb energy) without fracture
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