NDLI: The effects of time-dependent dissipation on the basins of attraction for the pendulum with oscillating support

Content Provider	Springer Nature Link
Author	Gentile, Guido Bartuccelli, Michele Wright, James A.
Copyright Year	2014
Abstract	We consider a pendulum with vertically oscillating support and time-dependent damping coefficient which varies until reaching a finite final value. Although it is the final value which determines which attractors eventually exist, the sizes of the corresponding basins of attraction are found to depend strongly on the full evolution of the dissipation. In particular, we investigate numerically how dissipation monotonically varying in time changes the sizes of the basins of attraction. It turns out that, in order to predict the behaviour of the system, it is essential to understand how the sizes of the basins of attraction for constant dissipation depend on the damping coefficient. For values of the parameters where the systems can be considered as a perturbation of the simple pendulum, which is integrable, we characterise analytically the conditions under which the attractors exist and study numerically how the sizes of their basins of attraction depend on the damping coefficient. Away from the perturbation regime, a numerical study of the attractors and the corresponding basins of attraction for different constant values of the damping coefficient produces a much more involved scenario: changing the magnitude of the dissipation causes some attractors to disappear either leaving no trace or producing new attractors by bifurcation, such as period doubling and saddle-node bifurcation. Finally, we pass to the case of an initially non-constant damping coefficient, both increasing and decreasing to some finite final value, and we numerically observe the resulting effects on the sizes of the basins of attraction: when the damping coefficient varies slowly from a finite initial value to a different final value, without changing the set of attractors, the slower the variation the closer the sizes of the basins of attraction are to those they have for constant damping coefficient fixed at the initial value. Furthermore, if during the variation of the damping coefficient attractors appear or disappear, remarkable additional phenomena may occur. For instance, it can happen that, in the limit of very large variation time, a fixed point asymptotically attracts the entire phase space, up to a zero-measure set, even though no attractor with such a property exists for any value of the damping coefficient between the extreme values.
Ending Page	1409
Page Count	33
Starting Page	1377
File Format	PDF
ISSN	0924090X
e-ISSN	1573269X
Journal	Nonlinear Dynamics
Issue Number	4
Volume Number	77
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-04-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Attractors Nonautonomous smooth dynamical systems Bifurcations and instability Dissipative systems Simple pendulum Vibration, Dynamical Systems, Control Non-constant dissipation Periodic solutions Qualitative investigation and simulation of models Forced motions Mechanics Automotive Engineering Mechanical Engineering Basins of attraction Periodic motions Action-angle variables
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Applied Mathematics Control and Systems Engineering Mechanical Engineering Electrical and Electronic Engineering Aerospace Engineering

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