arXiv subjects

Abhijith Ajayakumar

Publications and source records attributed to Abhijith Ajayakumar.

3 recordsLinked to original sources

arXiv2024

Controllability of a Class of Nonlinear Networked Systems

Various controllability conditions have been obtained by researchers for heterogeneous networked systems with linear dynamics. However, the literature for nonlinear, heterogeneous networked systems is comparatively less. In this paper we analyse the controllabiity aspect of a nonlinearly perturbed linear networked system. The basic assumption is that the linear system is controllable and the nonlinear perturbation functions satisfy Holder continuity condition and in particular Lipschitz condition. The Boyd-Wong fixed point theorem is employed to prove controllability of the nonlinear system. The result is illustrated with numerical examples.

math.OC↗

arXiv2024

Controllability and Observability of Heterogeneous Networked Systems with Non-uniform Node Dimensions and Distinct Inner-Coupling Matrices

In this paper we extend the work in the conference paper 'On the Controllability and Observability of Heterogeneous Networked Systems with distinct node dimensions and inner-coupling matrices' wherein the controllability and observability of a heterogeneous networked system with distinct node dimensions were studied. This paper adds to the conference paper a necessary and sufficient condition for controllability of the networked system. The result demonstrates the dependence of controllability of the network on factors like network topology, inner interactions among nodes and nodal dynamics. The result is formulated by characterizing the left eigenvectors of the network state matrix. Another necessary and sufficient condition for controllability, which is a reformulation of the \textit{Popov-Belevitch-Hautus} controllability condition, a necessary and sufficient condition for observability of the networked system and certain necessary conditions for controllability of the networked system are the other results established in this paper. Variants of these results under certain specific network topologies like path, cycle, star and wheel are also discussed.

math.OC↗

arXiv2020

Controllability of LTI Networked Systems with Heterogeneous Dynamics

In this paper, a necessary and sufficient condition for the controllability of networked systems with heterogeneous dynamics is established where the nodes are higher dimensional linear time invariant systems and the network topology is directed and weighted. The controllability of networked system over some specific topologies are also examined and some non-controllability results are obtained. The theoretical results are demonstrated with examples.

math.OC↗