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Methods of Accelerated Convergence in Nonlinear Mechanics (Paperback, Softcover reprint of the original 1st ed. 1976): V. Kumar Methods of Accelerated Convergence in Nonlinear Mechanics (Paperback, Softcover reprint of the original 1st ed. 1976)
V. Kumar; N N Bogoljubov; Edited by I. N. Sneddon; J a Mitropoliskii, A.M. Samoilenko
R1,571 Discovery Miles 15 710 Ships in 10 - 15 working days

This monograph deals with some of the latest results in nonlinear mechanics, obtained recently by the use of a modernized version of Bogoljubov's method of successive changes of variables which ensures rapid convergence. This method visualised as early as 1934 by Krylov and Bogoljubov provides an effective tool for solving many interesting problems of nonlinear mechanics. It led, in particular, to the solution of the problem of the existence of a quasi periodic regime, with the restriction that approximate solutions obtained in the general case involved divergent series. Recently, making use of the research of Kolmogorov and Arno'ld, Bogoljubov has modernised the method of successive substitutions in such a way that the convergence of the corresponding expansions is ensured. This book consists of a short Introduction and seven chapters. The first chapter presents the results obtained by BogoIjubov in 1963 on the extension of the method of successive substitutions and the study of quasi periodic solutions applied to non-conservative systems (inter alia making explicit the dependence of these solutions on the parameter, indicating methods of obtaining asymptotic and convergent series for them, etc.)."

Dichotomies and Stability in Nonautonomous Linear Systems (Hardcover): Yu. A. Mitropolsky, A.M. Samoilenko, V.L. Kulik Dichotomies and Stability in Nonautonomous Linear Systems (Hardcover)
Yu. A. Mitropolsky, A.M. Samoilenko, V.L. Kulik
R6,707 Discovery Miles 67 070 Ships in 12 - 17 working days


The investigation of bounded solutions to systems of differential equations involve some important and challenging problems of perturbation theory of invariant toroidal manifolds. Linear nonautonomous equations arise as mathematical models in mechanics, chemistry, and biology and this monograph is a detailed study of the application of Lyapunov functions with variable sign, expressed in quadratic forms to the solution of problems including; preservation of invariant tori of dynamic systems under perturbation. The volume is a classic contribution to the literature on stability theory and provides a useful source of reference for postgraduates and researchers.

Systems of Evolution Equations with Periodic and Quasiperiodic Coefficients (Hardcover): IU.A. Mitropol'skii, A.M.... Systems of Evolution Equations with Periodic and Quasiperiodic Coefficients (Hardcover)
IU.A. Mitropol'skii, A.M. Samoilenko, D.I. Martinyuk
R2,961 Discovery Miles 29 610 Ships in 10 - 15 working days

Many problems in celestial mechanics, physics and engineering involve the study of oscillating systems governed by nonlinear ordinary differential equations or partial differential equations. This volume represents an important contribution to the available methods of solution for such systems. The contents are divided into six chapters. Chapter 1 presents a study of periodic solutions for nonlinear systems of evolution equations including differential equations with lag, systems of neutral type, various classes of nonlinear systems of integro-differential equations, etc. A numerical-analytic method for the investigation of periodic solutions of these evolution equations is presented. In chapters 2 and 3, problems concerning the existence of periodic and quasiperiodic solutions for systems with lag are examined. For a nonlinear system with quasiperiodic coefficients and lag, the conditions under which quasiperiodic solutions exist are established. Chapter 4 is devoted to the study of invariant toroidal manifolds for various classes of systems of differential equations with quasiperiodic coefficients. Chapter 5 examines the problem concerning the reducibility of a linear system of different equations with quasiperiodic coefficients to a linear system of difference equations with constant coefficients. Chapter 6 contains an investigation of invariant toroidal sets for systems of difference equations with quasiperiodic coefficients.

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