Title:Robust Fault Estimator Design for Uncertain Nonlinear Networked Control Systems
VOLUME: 2 ISSUE: 2
Author(s):Dan Huang and Sing Kiong Nguang
Affiliation:The Department of Electrical and Computer Engineering, The University of Auckland, Private Bag 92019 Auckland, New Zealand.
Keywords:Fault estimator, networked control, robustness.
Abstract:This work proposes the design of a robust fault estimator for a class of nonlinear uncertain networked control
systems (NCSs) that ensures the fault estimation error is less than prescribed H∞ performance level, irrespective of
parameter uncertainties and network-induced effects. T-S fuzzy models are firstly employed to describe the nonlinear
plant. Markov process and Bernoulli distribution are respectively used to model the random network-induced effects, i.e.,
the network-induced delay and data packet dropouts. Sufficient conditions for the existence of such a fault estimator for
this class of NCSs are derived in terms of the solvability of bilinear matrix inequalities. An iterative algorithm is proposed
to change this non-convex problem into quasi-convex optimization problems, which can be solved effectively by available
mathematical tools. The effectiveness of the proposed design methodology is verified by a numerical example.
