Journal ArticleDOI
Multiple Scales via Galerkin Projections: Approximate Asymptotics for Strongly Nonlinear Oscillations
S. Das,Anindya Chatterjee +1 more
TLDR
In this paper, Galerkin projections are used to obtain approximate realizations of the method of multiple scales and the related method of averaging are commonly used to study slowly modulated oscillations.Abstract:
The method of multiple scales and the related method of averaging are commonly used to study slowly modulated oscillations. If the system of interest is a slightly perturbed harmonic oscillator, then these techniques can be applied easily. If the unperturbed system is strongly nonlinear (though possibly conservative), then these methods can run into difficulties due to the impossibility of carrying out required analytical operations in closed form. In this paper, we abandon the requirement of closed form analytical treatment at all stages. Instead, Galerkin projections are used to obtain approximate realizations of the method of multiple scales. This paper adapts recent work using similar ideas for approximate realizations of the method of averaging. A key contribution of the present work is in the systematic identification and removal of secular terms in the general nonlinear case, a procedure that is more difficult than for the perturbed harmonic oscillator case, and that is unnecessary for averaging. A strength of the present work is that the heuristics (Galerkin) and asymptotics (multiple scales) are kept distinct, leaving room for systematic refinement of the former without compromising the asymptotic features of the latter.read more
Citations
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Journal ArticleDOI
A generalized iteration procedure for calculating approximations to periodic solutions of “truly nonlinear oscillators”
TL;DR: In this paper, an extended iteration method for calculating the periodic solutions of nonlinear oscillator equations is given, illustrated by applying it to two “truly nonlinear ODEs” differential equations.
Journal ArticleDOI
A method to stochastic dynamical systems with strong nonlinearity and fractional damping
Yong Xu,Yongge Li,Di Liu +2 more
TL;DR: In this paper, a new technique is proposed to deal with strongly nonlinear stochastic systems with fractional derivative damping and random harmonic excitation, combining the advantages of Linstedt-Poincare (L-P) method and multiple scales method, introducing a different frequency expansion form and a time transformation, a series of perturbation equations is obtained according to the powers of parameter.
Journal ArticleDOI
Harmonic Balance Based Averaging: Approximate Realizations of an Asymptotic Technique
TL;DR: In this paper, it is shown how to obtain approximate realizations of the asymptotic analytical technique by using the classical but heuristic approximation method of harmonic balance, which is a technique commonly used to study weakly nonlinear oscillations via small perturbations of the harmonic oscillator.
Journal ArticleDOI
Construction of approximate analytical solutions to strongly nonlinear damped oscillators
Baisheng Wu,W. P. Sun +1 more
TL;DR: In this paper, an analytical approximate method for strongly nonlinear damped oscillators is proposed by combining the Newton's method with the harmonic balance method, which can be applied to general oscillators with odd nonlinearities as well as even ones even without linear restoring force.
Journal ArticleDOI
Multiple scales analysis of early and delayed boundary ejection in Paul traps
TL;DR: In this paper, a slow flow equation was developed to approximate the solution of a weakly nonlinear Mathieu equation to describe ion dynamics in the neighborhood of the stability boundary of ideal traps (where the Mathieu parameter q z = q z ∗ = 0.908046 ).
References
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Differential Equations, Dynamical Systems, and Linear Algebra
Morris W. Hirsch,Steve Smale +1 more
TL;DR: In this article, the structure theory of linear operators on finite-dimensional vector spaces has been studied and a self-contained treatment of that subject is given, along with a discussion of the relations between dynamical systems and certain fields outside pure mathematics.
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Modified Lindstedt–Poincare methods for some strongly non-linear oscillations: Part I: expansion of a constant
TL;DR: In this paper, a modified Lindstedt-Poincare method is proposed to avoid the occurrence of secular terms in the perturbation series solution, which is suitable not only for weakly nonlinear systems, but also for strongly non-linear systems.
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