Geodesic
The harmonic balance method for finding approximate periodic solutions of the Lorenz system
Vestnik rossijskih universitetov. Matematika, Tome 24 (2019) no. 126, pp. 187-203 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the harmonic balance method for finding approximate periodic solutions of the Lorenz system. When developing software that implements the described method, the math package Maxima was chosen. The drawbacks of symbolic calculations for obtaining a system of nonlinear algebraic equations with respect to the cyclic frequency, free terms and amplitudes of the harmonics, that make up the desired solution, are shown. To speed up the calculations, this system was obtained in a general form for the first time. The results of the computational experiment are given: the coefficients of trigonometric polynomials approximating the found periodic solution, the initial condition, and the cycle period. The results obtained were verified using a high-precision method of numerical integration based on the power series method and described earlier in the articles of the authors.
Keywords: Lorenz system, attractor, harmonic balance method, Fourier series. 
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A. N. Pchelintsev; A. A. Polunovskiy; I. Yu. Yukhanova. The harmonic balance method for finding approximate periodic solutions of the Lorenz system. Vestnik rossijskih universitetov. Matematika, Tome 24 (2019) no. 126, pp. 187-203. http://geodesic.mathdoc.fr/item/VTAMU_2019_24_126_a4/

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