Abstract
Dynamics of discontinuous nonlinear systems subjected to random excitation is studied. Such systems occur in many mechanical and aerospace applications involving impact, friction, clearance, backlash, freeplay etc. These systems are characterized by sharp switches in dynamical behaviour described by discontinuous stochastic differential equations. An adaptive time step** approach is developed in combination with a bisection algorithm to locate precisely the discontinuity point in the numerical integration advanced by the Milstein method. The Brownian tree approach is used to direct the integration along the correct Brownian path. The examples of a Duffing oscillator with one- and two-sided impacts and a linear oscillator with a nonlinear discontinuous dry friction-type damper (Coulomb dam**) subjected to combined harmonic and white noise excitations are considered. Stable periodic motion, D-bifurcation and chaotic dynamics are exhibited in different parametric regimes. The path-wise numerical integration procedure demonstrates the accuracy and efficiency of the proposed scheme in the dynamic analysis of the noisy vibro-impact oscillator and the friction oscillator.
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Kumar, P., Narayanan, S. Chaos and bifurcation analysis of stochastically excited discontinuous nonlinear oscillators. Nonlinear Dyn 102, 927–950 (2020). https://doi.org/10.1007/s11071-020-05960-5
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DOI: https://doi.org/10.1007/s11071-020-05960-5