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Article type: Research Article
Authors: Leung, A.Y.T. | Ge, T.
Affiliations: Department of Civil and Structural Engineering, University of Hong Kong, Hong Kong
Abstract: Normal form theory is important for studying the qualitative behavior of nonlinear oscillators. In some cases, higher order normal forms are required to understand the dynamic behavior near an equilibrium or a periodic orbit. However, the computation of high-order normal forms is usually quite complicated. This article provides an explicit formula for the normalization of nonlinear differential equations. The higher order normal form is given explicitly. Illustrative examples include a cubic system, a quadratic system and a Duffing–Van der Pol system. We use exact arithmetic and find that the undamped Duffing equation can be represented by an exact polynomial differential amplitude equation in a finite number of terms.
DOI: 10.3233/SAV-1995-2405
Journal: Shock and Vibration, vol. 2, no. 4, pp. 307-319, 1995
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