Showing papers by "Gabriele Pannocchia published in 2007"
TL;DR: Small tables with only 25-200 entries were used to obtain this performance, while full enumeration is intractable for this example, and Versions of PE are shown to be closed-loop stable.
136 citations
TL;DR: It is shown that, when offset-free control is sought, the dynamic observer is equivalent to choosing an integrating disturbance model and an observer for the augmented system.
Abstract: This note presents a method for the combined design of an integrating disturbance model and of the observer (for the augmented system) to be used in offset-free model predictive controllers. A dynamic observer is designed for the original (nonaugmented) system by solving an Hprop control problem aimed at minimizing the effect of unmeasured disturbances and plant/model mismatch on the output prediction error. It is shown that, when offset-free control is sought, the dynamic observer is equivalent to choosing an integrating disturbance model and an observer for the augmented system. An example of a chemical reactor shows the main features and benefits of the proposed method.
126 citations
TL;DR: In this article, phase and microstructure changes of Li2ZrO3 during the CO2 sorption process were analyzed with the help of thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction analyses.
Abstract: Lithium zirconate (Li2ZrO3) is one of the most promising materials for CO2 separation from flue gas at high temperature. This material is known to be able to adsorb a large amount of CO2 around 500−600 °C. It was also reported that the addition of lithium/potassium carbonate to Li2ZrO3 increased the CO2 sorption rate when compared to pure Li2ZrO3. In this study, we examine the CO2 sorption mechanism on Li2ZrO3 by analyzing phase and microstructure changes of Li2ZrO3 during the CO2 sorption process with the help of thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction analyses. We report on CO2 sorption experiments for different Li2ZrO3 based sorbents at different operating conditions in order to identify the most appropriate sorbent and experimental conditions. We also propose a kinetic model that is a variant of a double-shell model proposed in the literature by introducing additional dynamics to obtain a consistent response of the CO2 uptake curve during the initial part of the...
74 citations
TL;DR: The concept of steady-state closed-loop consistency, which is the ability of an estimator to guarantee low offset in the unmeasured controlled variables, is adopted and theoretical results are derived.
7 citations
TL;DR: Open-loop (uncorrelated and rotated) random signals are compared against closed-loop signals with the aim of finding the most appropriate ones to be used in multivariable subspace identification of ill-conditioned systems and it is shown that closed- loop data give superior models.
2 citations
TL;DR: In this paper, an overall measure of controller suboptimality is proposed along with a matrix that quantifies the closed-loop interactions among control loops, where the minimum interactions evaluated under the benchmark controller can be regarded as an intrinsic process property.