Перегляд за Автор "Perepelkin, Nikolay V."
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Документ Construction of Nonlinear Normal Modes by Shaw-Pierre via Schur Decomposition(NTU "KhPI", 2016) Perepelkin, Nikolay V.In the paper the simplification of construction of nonlinear normal vibration modes by Shaw-Pierre in power series form is considered. The simplification can be obtained via change of variables in the equations o f motion of dynamical system under consideration. This change of variables is constructed by means of so-called ordered Schur matrix decomposition. As the result of the transformation there is no need in solving nonlinear algebraic equations in order to evaluate coefficients of nonlinear normal mode.Документ Forced Nonlinear Normal Modes in the One Disk Rotor Dynamics(Institute of Mechanics and Mechatronics, Technical University of Vienna, 2014) Perepelkin, Nikolay V.; Mikhlin, Yuri V.; Pierre, ChristopheA new approach combining both the nonlinear normal modes approach and the Rauscher method is proposed to construct forced vibrations in non-autonomous systems with an internal resonance. Forced vibrations of a one-disk unbalanced rotor with the nonlinear elastic bearings are considered. Gyroscopic effects, an asymmetrical disposition of the disk in the isotropic elastic shaft and internal resonance are taken into account.Документ Non-Iterative Rauscher Method for 1-DOF System: a New Approach to Studying Non-Autonomous System via Equivalent Autonomous One(NTU "KhPI", 2016) Perepelkin, Nikolay V.In the paper a new non-iterative variant of Rauscher method is considered. In its current statement the method can be used in analysis of forced harmonic oscillations in 1-DOF nonlinear system. It is shown that three different types o f equivalent authonomous dynamical systems can be built for a given 1-DOF non-autonomous one. Two of them (1st and 2nd type) have wider set of solutions than that of the initial system. These solutions correspond to various values of amplitude and phase of external excitation. Solutions of the equivalent system of 3rd type are exclusively periodic ones. Based on the equivalent system of 3rd type such a function W(x,x') can be constructed that its level curves correspond to periodic orbits of the initial non-autonomous system. This function can be built a priori via computation of the invariant manifold of the equivalent system of 1st type. Using the same approach the Rauscher expansions cos(Qt)=C(x,x'), sin(Qt)=S(x,x') can also be constructed. It is also shown that equivalent systems can be investigated by means of harmonic balance method which allows construction o f W(x,x'), C(x,x') andS(x,x') in semi-analytical manner.