# ALBERT

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• perturbation methods  (4)
• 1990-1994  (4)
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• 1
Electronic Resource
Springer
Nonlinear dynamics 3 (1992), S. 225-243
ISSN: 1573-269X
Keywords: Nonlinear oscillations ; chaos ; escape ; perturbation methods
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics
Notes: Abstract The paper is devoted to the study of common features in regular and strange behavior of the three classic dissipative softening type driven oscillators: (a) twin-well potential system, (b) single-well potential unsymmetric system and (c) single-well potential symmetric system. Computer simulations are followed by analytical approximations. It is shown that the mathematical techniques and physical concepts related to the theory of nonlinear oscillations are very useful in predicting bifurcations from regular, periodic responses to cross-well chaotic motions or to escape phenomena. The approximate analysis of periodic, resonant solutions and of period doubling or symmetry breaking instabilities in the Hill's type variational equation provides us with closed-form algebraic simple formulae; that is, the relationship between critical system parameter values, for which strange phenomena can be expected.
Type of Medium: Electronic Resource
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• 2
Electronic Resource
Springer
Nonlinear dynamics 1 (1990), S. 401-420
ISSN: 1573-269X
Keywords: Chaos ; perturbation methods ; elliptic functions ; differential equations
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics
Notes: Abstract We investigate the system $$\ddot x - x\cos \varepsilon 1 + x^3 = 0$$ in which ε≪1 by using averaging and elliptie functions. It is shown that this system is applicable to the dynamics of the familiar rotating-plane pendulum. The slow foreing permits us to envision an ‘instantancous phase portrait’ in the $$x - \dot x$$ phase plane which exhibits a center at the origin when cos ε1≤0 and a saddle and associated double homoclinic loop separatrix when cos ɛ 1 〉 0. The chaos in this problem is related to the question of on which side (left (=L) or right (=R)) of the reappearing double homoclinic loop separatrix a motion finds itself. We show that the sequence of L's and R's exhibits sensitive dependence on initial conditions by using a simplified model which assumes that motions cross the instantancous separatrix instantancously. We also present an improved model which ‘patches’ a separatrix boundary layer onto the averaging model. The predictions of both models are compared with the results of numerical integration.
Type of Medium: Electronic Resource
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• 3
Electronic Resource
Springer
Nonlinear dynamics 3 (1992), S. 347-364
ISSN: 1573-269X
Keywords: Nonlinear vibrations ; normal modes ; perturbation methods ; bifurcations
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics
Notes: Abstract In this work we investigate the existence, stability and bifurcation of periodic motions in an unforced conservative two degree of freedom system. The system models the nonlinear vibrations of an elastic rod which can undergo both torsional and bending modes. Using a variety of perturbation techniques in conjunction with the computer algebra system MACSYMA, we obtain approximate expressions for a diversity of periodic motions, including nonlinear normal modes, elliptic orbits and non-local modes. The latter motions, which involve both bending and torsional motions in a 2:1 ratio, correspond to behavior previously observed in experiments by Cusumano.
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• 4
Electronic Resource
Springer
Nonlinear dynamics 3 (1992), S. 123-143
ISSN: 1573-269X
Keywords: Nonlinear normal modes ; nonlinear resonances ; perturbation methods
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics
Notes: Abstract The fundamental and subharmonic resonances of a two degree-of-freedom oscillator with cubic stiffness nonlinearities and linear viscous damping are examined using a multiple-seales averaging analysis. The system is in a ‘1−1’ internal resonance, i.e., it has two equal linearized eigenfrequencies, and it possesses ‘nonlinear normal modes.’ For weak coupling stiffnesses the internal resonance gives rise to a Hamiltonian Pitchfork bifurcation of normal modes which in turn affects the topology of the fundamental and subharmonic resonance curves. It is shown that the number of resonance branches differs before and after the mode bifurcation, and that jump phenomena are possible between forced modes. Some of the steady state solutions were found to be very sensitive to damping: a whole branch of fundamental resonances was eliminated even for small amounts of viscous damping, and subharmonic steady state solutions were shifted by damping to higher frequencies. The analytical results are verified by a numerical integration of the equations of motion, and a discussion of the effects of the mode bifurcation on the dynamics of the system is given.
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