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An asymptotic solution to nonlinear transmission lines. (English) Zbl 1136.35078

Summary: This paper explores an asymptotic approach to the solution of a nonlinear transmission line model. The model is based on a set of nonlinear partial differential equations without analytic solution. The perturbations method is used to reduce the system of nonlinear equations to a single nonlinear partial differential equation, namely to the modified Korteweg-de Vries equation (mKdV). By using the Laplace transform, the solution is represented in integral form in terms of Green’s functions. The solution for the nonlinear case is obtained by means of asymptotic methods. Thus, an approximate explicit analytic solution to the problem is obtained where the errors can be controlled. This allows us to analyze the nonlinear behavior of the solution. This kind of information is difficult to obtain by means of numerical methods due to the fact that for large periods of time greater computational resources are required and accumulated errors increase. For this reason, asymptotic methods have a great importance as a natural complement to numerical methods. Computer simulations support the presented developments.

MSC:

35Q53 KdV equations (Korteweg-de Vries equations)
35A35 Theoretical approximation in context of PDEs
35C15 Integral representations of solutions to PDEs
Full Text: DOI

References:

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