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    The parameter space boundary for escape and chaos in the Duffing twin-well oscillator : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Physics at Massey University

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    Abstract
    The Duffing 'twin-well' oscillator is investigated both experimentally and theoretically. The construction of a physical, nonlinear air-track oscillator with an ultrasound position detection system permits observation of a wide range of oscillatory behaviours, including chaotic motion, on a human scale (amplitudes of ~metre). Phase space and Poincare sections are constructed in real time and, in the case of chaos, Lyapunov exponents determined. The range of control space conditions which give rise to chaos is investigated. In particular, the boundaries between chaotic and periodic motion are measured experimentally. An analytic description of the primary boundaries of interest is constructed via a harmonic-balance generated solution to the governing differential equation and a perturbation style stability analysis. Successful theoretical prediction of the chaos boundary is achieved without recourse to numerical methods.
    Date
    1999
    Author
    Reid, Christopher I.
    Rights
    The Author
    Publisher
    Massey University
    URI
    http://hdl.handle.net/10179/2361
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