Abstract: A dynamic high gain like observer is proposed for a class of MIMO nonlinear systems that are observable for any inputs. Two main results are worth to be mentioned. The first one is related to the considered class of systems that is composed by cascade subsystems and each subsystem is associated to a subset of the outputs. Each subsystem assumes a triangular dependence on the state of ...

This paper focuses on the robust mixed H2/H∞ observer design problem for removal of NOx sensor ammonia cross-sensitivity in selective catalytic reduction (SCR) systems. Due to the ammonia cross-sensitivity, the reading of the NOx sensor is contaminated severely. In order to utilize the concentration of the NOx in the downstream tailpipe, it is desired to design an observer to estimate the actua...

In this article, a mixed robust/optimal control approach is proposed to treat the active vibration control (or active vibration suppression) problems of flexible structural systems under the effects of mode truncation, linear time-varying parameter perturbations and nonlinear actuators. A new robust stability condition is derived for the flexible structural system which is controlled by an obse...

We propose a global high-gain scaling based observer/controller for systems in the uncertain generalized output-feedback canonical form. Time-varying nonlinear parametric uncertainty is allowed to occur coupled with unmeasured states in the system dynamics. This represents a significant generalization from existing results which allow unknown parameters only in outputdependent terms. This restr...

Sliding-mode observers are known to be robust against presence of disturbances and modeling uncertainties [1−3]. Although these observers are highly robust with respect to noises in system inputs, it turned out that the corresponding stability degrades in systems that exhibit output noise or mixed uncertainties [4]. When the measurements are noisy, because the time derivatives cannot be accurat...

This paper deals with the problem of estimating CSD (Crystal Size Distributions) during polymorphic crystallization processes. The proposed approach is based on the high gain observer using the discretization of the PBE’s (Population Balance Equations). First, in the growth phase, the monitoring of the nuclei production permits the estimation of the CSD using an adequate observer. In the dissol...