Discrete cellular lattice assembly

Robotic assembly of discrete cellular lattices at super-hertz (>1Hz) assembly rates is shown to be possible by integrating the design of a modular robotic assembler with the specified lattice topology such that the lattice can itself be removed from the incremental assembly process. Limits to assembly rates are ultimately dependent on allowable error, system stiffness, and damping characteristics. Vibrations due to cyclical motions of the end-effector, locomotion system, and the dynamic response of an incrementally varying lattice must settle to acceptable ranges to enable engagement between end-effectors, discrete elements, and their affixing features to adjacent cells. For given system dynamics, longer settling times enables greater energy dissipation, and less error. With a greater allowable error at the interface, a shorter assembly cycle period can be attained. Passive alignment features designed into the robot end-effectors, locomotion systems, and the discrete lattice elements reduce the precision requirements of the assembly process by opening up the acceptable error range, thereby, enabling higher assembly cycle-rates. An experiment was performed to evaluate how an assembler locally referencing a lattice performed in comparison to a globally referenced assembler. The two assemblers were of similar kinematic form: both gantry-type CNC machines: a ShopBot and a custom built relative robotic assembler. The results showed superior performance by the global coordinate frame system. An error budget analysis of the two systems showed that the locally referenced, lattice based system had a larger more variable structural loop than the global coordinate frame ShopBot. The control experiment, demonstrated 0.1Hz assembly rates, while first order approximations predict a maximum 4Hz cycle for the specified interface geometry. Results show that in order to successfully assemble discrete cellular lattices at super-hertz rates the robot must itself become the local, instantaneous global coordinate frame such that the structural loop is absolutely minimized, while stiffness is maximized; at the instantaneous moment of assembly the structural loop of the robot must reference only itself.

Department dc:contributor.department

Program in Media Arts and Sciences (Massachusetts Institute of Technology)

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2015

Author dc:creator

• Carney, Matthew Eli

Advisor dc:contributor.advisor

• Neil Gershenfeld.

• Architecture. Program in Media Arts and Sciences.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/101845

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/101845