Title page for ETD etd-07282004-141952

Type of Document

Master's Thesis

Author

Thakur, Gunjan Singh

URN

etd-07282004-141952

Title

A Newton Method For The Continuation Of Invariant Tori

Degree

Master of Science

Department

Engineering Science and Mechanics

Advisory Committee

Advisor Name	Title
Dankowicz, Harry J.	Committee Chair
Hendricks, Scott L.	Committee Member
Kachroo, Pushkin	Committee Member

Keywords

Dynamical system
Continuation
Nonlinear system
Invarinat tori
Newton method

Date of Defense

2004-07-20

Availability

restricted

Abstract

This thesis proposes a novel method for locating a p-dimensional invariant torus of an
n-dimensional map.
A set of non-linear equations is formulated and solved using the Newton-Raphson scheme.
The method requires a set of sampled points on a guess invariant torus. An interpolant is
passed through these points to compute the pointwise shift on the invariant torus, which is
used to formulate the equation of invariance for the torus under the given map.
The principal application of this method is to locate invariant tori of continuous systems.
These tori occur for continuous dynamical systems having quasiperiodic orbits in state
space. The discretization of the continuous system in terms of a map is accomplished in
terms of its flow function.
Results for one-dimensional invariant tori in two and three-dimensional state space and for
two-dimensional invariant tori in three and four-dimensional maps are presented.

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