A Mathematica program for the approximate analytical solution to a nonlinear undamped Duffing equation by a new approximate approach
Abstract According to Mickens [R.E. Mickens, Comments on a Generalized Galerkin's method for non-linear oscillators, J. Sound Vib. 118 (1987) 563], the general HB (harmonic balance) method is an approximation to the convergent Fourier series representation of the periodic solution of a nonlinea...
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