Extension of the Hamiltonian approach with general initial conditions
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Escola de Engenharia de São Carlos, Universidade de São Paulo, São Paulo
Faculty of Technical Sciences, University of Novi Sad, Novi Sad
Submission date: 2017-04-21
Acceptance date: 2017-09-21
Online publication date: 2018-01-15
Publication date: 2018-01-15
Journal of Theoretical and Applied Mechanics 2018;56(1):255–267
In this paper, the Hamiltonian approach is extended for solving vibrations of nonlinear conservative oscillators with general initial conditions. Based on the assumption that the derivative of Hamiltonian is zero, the frequency as a function of the amplitude of vibration and initial velocity is determined. A method for error estimation is developed and the accuracy of the approximate solution is treated. The procedure is based on the ratio between the average residual function and the total energy of the system. Two computational algorithms are described for determining the frequency and the average relative error. The extended Hamiltonian approach presented in this paper is applied for two types of examples: Duffing equation and a pure nonlinear conservative oscillator.