Asymptotic angular stability in non-linear systems: rotation numbers and winding numbers |
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| Authors: | Patrick E Mcsharry Paulo R C Ruffino |
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| Affiliation: | 1. Mathematical Institute , University of Oxford , Oxford OX1 3LB, UK;2. Department of Engineering Science , University of Oxford , Oxford OX1 3PJ, UK E-mail: mcsharry@maths.ox.ac.uk;3. Departamento de Matemática , Universidade Estadual de Campinas , 13.081-970 Campinas, SP, Brazil E-mail: ruffino@ime.unicamp.br |
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| Abstract: | The asymptotic angular stability of a dynamical system may be quantified by its rotation number or its winding number. These two quantities are shown to result from different assumptions, made about the flow generating the Poincaré map which results from the sequence of homeomorphisms in S l. An ergodic theorem of existence a.s. of the rotation number for non-linear systems is given. The advantages and disadvantages of both the rotation and winding numbers are discussed. Numerical calculations of the distribution of rotation number and winding number arising from different initial conditions are presented for three different chaotic maps. |
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