Neural Networks for the Dynamics of Multi-Link Systems

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Title: Neural Networks for the Dynamics of Multi-Link Systems
Author: Tracy, William Christopher
Advisors: Larry Silverberg, Committee Chair
Greg Buckner, Committee Member
Paul Ro, Committee Member
Abstract: This paper developed specialized artificial neural networks for dynamical systems. For single-degree-of-freedom systems, specialized networks were developed for a) first-order linear, b) second-order linear, complex, first-order, and c) second-order with sigmoid damping (a generalization of viscous damping and dry friction damping). Digitization errors were eliminated by a specialized sub-network that corrected amplitude and phase output. Next, a network was developed for normal-mode systems. Finally, networks were developed for multi-link systems. Trigonometric nonlinearities were handled by the activation functions and multiplicative nonlinearities were handled by a custom sub-network. The treatment of the trigonometric nonlinearities and the multiplicative nonlinearities are kernels that can be expanded into specialized networks for a broad class of multi-link systems. The paper closes with an illustrative example of a three-link system resembling an upper arm, forearm, and hand. The three-link system is optimized to throw a basketball in a hoop with minimum effort.
Date: 2005-03-28
Degree: MS
Discipline: Mechanical Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/1678


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