Approximate general solution of 2-degrees of freedom dynamical systems using `les solutions precieuses'

Details Approximate general solution of 2-degrees of freedom dynamical systems using `les solutions precieuses' Approximate general solution of 2-degrees of freedom dynamical systems using `les solutions precieuses'

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ap%26ss.286..461g&link_type=abstract

Astrophysics and Space Science, v. 286, Issue 3, p. 461-486 (2003).

Astronomy and Astrophysics

Astrophysics

2

Dynamical System, Axi-Symmetric Potential, Equilibrium Points, Periodic Solutions, Numerical Integration, Periodic Family Curves, Approximate General Solution, Stability, Stable/Unstable Periodic Family Arcs, Poincar&Eacute, Surface Of Sections, Order, Chaos, `Third Integrals', Zooming Into Space Of Solution

Scientific paper

This paper presents the procedure of a computational scheme leading to approximate general solution of the axi-symmetric,2-degrees of freedom dynamical systems. Also the results of application of this scheme in two such systems of the non-linear double oscillator with third and fifth order potentials in position variables. Their approximate general solution is constructed by computing a dense set of families of periodic solutions and their presentation is made through plots of initial conditions. The accuracy of the approximate general solution is defined by two error parameters, one giving a measure of the accuracy of the integration and calculation of periodic solutions procedure, and the second the density in the initial conditions space of the periodic solutions calculated. Due to the need to compute families of periodic solutions of large periods the numerical integrations were carried out using the eighth order, variable step, R-K algorithm, which secured for almost all results presented here conservation of the energy constant between 10-9 and 10-12 for single runs of any and all solutions. The accuracy of the approximate general solution is controlled by increasing the number of family curves and also by `zooming' into parts of the space of initial conditions. All families of periodic solutions were checked for their stability. The computation of such families within areas of `deterministic chaos' did not encounter any difficulty other than poorer precision. Furthermore, on the basis of the stability study of the computed families, the boundaries of areas of `order' and `chaos' were approximately defined. On the basis of these results it is concluded that investigations in thePoincaré sections have to disclose 3 distinct types of areas of `order' and 2 distinct types of areas of `chaos'. Verification of the `order'/`chaos' boundary calculation was made by working out several Poincaré surfaces of sections.

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