Disturbance attenuation with multi-sensing servo systems for high density storage devices

Ph.DDOCTOR OF PHILOSOPH

Vibration analysis and control in hard-disk drive servo systems

Master'sMASTER OF ENGINEERIN

Guest Editorial Introduction to the special issue on intelligent control of high-performance engineering systems

The article of record as published may be found at http://dx.doi.org/10.1080/00207721.2013.82466

Decentralized uniform input-to-state stabilization of hierarchically interconnected triangular switched systems with arbitrary switchings

We consider a class of large-scale systems composed of hierarchically interconnected switched nonlinear triangular form subsystems affected by external disturbances with arbitrarily varying switching signals. For any system of this class, we design a decentralized feedback controller which renders the entire large-scale closed-loop system globally ISS with respect to the external disturbances uniformly and regardless of the unknown switching signals. To solve the problem, we use a certain modification of the classical small gain theorems formulated in terms of the ISS Lyapunov functions and combine it with our version of the backstepping approach with a suitable gain assignment. (C) 2018 Elsevier Ltd. All rights reserved

A note on applications of a trajectory-based small-gain theorem to decentralized stabilization of switching networks with generalized dead zones

We propose a method for uniform decentralized stabilitzation for a class of large-scale networks of nonlinear switched systems in lower-triangular form with unknown arbitrary switchings. In contrast to the class of networks with the same structure of interconnections that was considered in [1], the dynamics of each subsystem of our network satisfies more general conditions and its input–output maps are not necessarily right invertible, for instance, they can have dead zones. Another difference from [1] is that the current result is proved by a different approach. Instead of using a small-gain theorem in terms of ISS Lyapunov functions as in [1], we use the trajectory-based small-gain theorem for switched systems proved in [2]