Montserrat Gil-Martinez

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This paper applies a recent full-matrix multi- input-multi-output QFT controller design methodology to simultaneously regulate nitrogen and phosphorus concentrations in the effluent of a wastewater treatment plant (WWTP) according to environmental standard policies. The robust controller is based on two terms: a non-diagonal pre- compensator for decoupling(More)
Under the perspective of a control education bridging the gap between theory and practice, this paper presents the control challenges for a MIMO time-delay process (a laboratory plant based on a heat-exchanger). Diagonal and full matrix control strategies are exposed taking into account performance limitations of feedback control and non-minimum phase(More)
When the process uncertainty size increases, even linear minimum phase systems must sacrifice desirable aggressive feedback control benefits to avoid an excessive ‘cost of feedback’, while preserving the robust stability. With a suitable uncertainty division and a QFT controller-prefilter to command each uncertainty subset inside a controllerscheduler(More)
This paper develops a position control strategy of a multi-rotor system, which moves from an X-Y way-point to another at constant maximum-achievable velocity, and follows rectilinear trajectories between way-points with slight deviations during transients. In achieving this, 2D-spatial displacement breaks down in time domain ramp tracking on each axis(More)
This paper presents the multivariable robust control of a laboratory-scale heat exchange process. After theoretical and experimental identification of its non-linear equations, 2×2 linear models with uncertainty and significant coupling are obtained. Using Horowitz's non-sequential multivariable method (within QFT) diagonal matrices of controllers(More)
The aim of this paper is to establish and quantify different operational goals and control strategies in autothermal thermophilic aerobic digestion (ATAD). This technology appears as an alternative to conventional sludge digestion systems. During the batch-mode reaction, high temperatures promote sludge stabilization and pasteurization. The digester(More)
This paper introduces an analytical formulation to describe QFT templates based on Fourier series. This allows to calculate the template contour of plants with a high number of uncertain parameters. The proposed solution consists of performing operations between analytical sub-templates. This saves calculation time and allows to work with an infinite set of(More)
Autothermal Thermophilic Aerobic Digestion (ATAD technology) is a promising alternative to conventional digestion systems. Aeration is a key factor in the performance of these kinds of reactors, in relation to effluent quality and operating costs. At present, the realisation of automatic control in ATADs is in its infancy. Additionally, the lack of robust(More)
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