Andrea Bongiovanni
Time-periodic sensitivity analysis methods for chaotic systems.
Rel. Gaetano Iuso. Politecnico di Torino, Master of science program in Aerospace Engineering, 2018
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Abstract
A new approach for sensitivity analysis of chaotic dynamical systems is presented. Classical sensitivity analysis methods, used to understand how design and control variables of a given system affect an output of interest, bring to a cumulative error growth if they are applied to a chaotic system with trajectories which are long relative to the predictability time scale of the problem. This occurs because a finite amplitude perturbation in the initial condition leads the finite-time statistical quantities of the observable of interest to diverge exponentially from the reference trajectory. The purpose of this project is to validate a new sensitivity analysis algorithm to obtain a solution that remains bounded over the time interval considered.
The method presented here is termed Periodic Shadowing (PS) and solves the linearised sensitivity equations by coupling it to periodic boundary condition in time and allows to compute the gradient of long time statistical quantities
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