Non-linear model-based estimation of quadratic and cubic damping mechanisms governing the dynamics of a chaotic spherical pendulum
- 21 March 2011
- journal article
- research article
- Published by SAGE Publications in Journal of Vibration and Control
- Vol. 18 (4), 536-547
- https://doi.org/10.1177/1077546310395969
Abstract
We investigate the non-linear damping mechanisms that govern the dynamics of a chaotic spherical pendulum. We reproduce the conditions of the celebrated chaotic experiment of Tritton (1986), and identify the bifurcation regions that correspond to periodic, quasi-periodic and chaotic-like response. Construction of the pendulum frequency and damping backbone curves from free vibration decay data reveal the existence of non-negligible non-linear damping. A non-linear model-based estimation procedure enables extraction of both quadratic and cubic damping coefficients which are deduced from a non-linear Rayleigh-type gradient dissipation function. Comparison of experimental results with solutions obtained via numerical analysis of the strongly non-linear pendulum model, augmented by the estimated damping mechanisms, sheds light on the possible cause of documented discrepancies in similar whirling systems between measurements and theoretical predictions obtained from models with only linear damping.Keywords
This publication has 33 references indexed in Scilit:
- Identification of weakly nonlinearities in multiple coupled oscillatorsJournal of Sound and Vibration, 2007
- Balancing energy to estimate damping parameters in forced oscillatorsJournal of Sound and Vibration, 2006
- Chaotic Vibration and Internal Resonance Phenomena in Rotor SystemsJournal of Vibration and Acoustics, 2005
- INTERNAL RESONANCES IN WHIRLING STRINGS INVOLVING LONGITUDINAL DYNAMICS AND MATERIAL NON-LINEARITIESJournal of Sound and Vibration, 2000
- Application of a Hilbert Transform-Based Algorithm for Parameter Estimation of a Nonlinear Ocean System Roll ModelJournal of Offshore Mechanics and Arctic Engineering, 1997
- Bifurcations of a Nonlinear Small-Body Ocean-Mooring System Excited by Finite-Amplitude WavesJournal of Offshore Mechanics and Arctic Engineering, 1997
- NUMERICAL SOLUTIONS OF FORCED VIBRATION AND WHIRLING OF A NON-LINEAR STRING USING THE THEORY OF A COSSERAT POINTJournal of Sound and Vibration, 1996
- Non-linear, non-planar and non-periodic vibrations of a stringJournal of Sound and Vibration, 1992
- Amplitude modulated and chaotic dynamics in resonant motion of stringsJournal of Sound and Vibration, 1989
- On damping models in free and forced rolling motionOcean Engineering, 1982