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# Periodic Solutions for Coupled Van Der Pol Oscillators of Two-Degree-of-Freedom Solved by Homotopy Analysis Method

[+] Author Affiliations
Wei Zhang, Qian Wang

Beijing University of Technology, Beijing, China

Youhua Qian

Beijing University of Technology, Beijing; Zhejiang Normal University, Jinhua, Zhejiang, China

Paper No. DETC2009-87135, pp. 955-962; 8 pages
doi:10.1115/DETC2009-87135
From:
• ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
• Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
• San Diego, California, USA, August 30–September 2, 2009
• Conference Sponsors: Design Engineering Division and Computers in Engineering Division
• ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3

## abstract

Innumerable engineering problems can be described by multi-degree-of-freedom (MDOF) nonlinear dynamical systems. The theoretical modelling of such systems is often governed by a set of coupled second-order differential equations. Albeit that it is extremely difficult to find their exact solutions, the research efforts are mainly concentrated on the approximate analytical solutions. The homotopy analysis method (HAM) is a useful analytic technique for solving nonlinear dynamical systems and the method is independent on the presence of small parameters in the governing equations. More importantly, unlike classical perturbation technique, it provides a simple way to ensure the convergence of solution series by means of an auxiliary parameter ħ. In this paper, the HAM is presented to establish the analytical approximate periodic solutions for two-degree-of-freedom coupled van der Pol oscillators. In addition, comparisons are conducted between the results obtained by the HAM and the numerical integration (i.e. Runge-Kutta) method. It is shown that the higher-order analytical solutions of the HAM agree well with the numerical integration solutions, even if time t progresses to a certain large domain in the time history responses.

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