Alejandro Rincón

• Universidad Católica de Manizales

In this work, a new adaptive controller is designed for substrate control of a fed-batch bioreactor in the presence of input saturation and unknown varying control gain with unknown upper and lower bounds. The output measurement noise and the unknown varying nature of reaction rate and biomass concentration and water volume are also handled. The de...

In this work, an adaptive controller for bioreactors, using the measurement of output gas flow rate to handle the uncertainty on biomass concentration and kinetic rate is developed. A mass–balance model based on an unique reaction pathway to represent the input–output behavior is considered. Time-varying and unknown but bounded behavior of plant pa...

En este trabajo se formula un esquema metodológico sistemático para el dimensionamiento de unidades de sedimentación de alta tasa de flujo ascendente con placas inclinadas. Para ello se utilizan los lineamientos y las ecuaciones existentes en la literatura. El desarrollo planteado permite definir valores adecuados para carga superficial (Cs) y razó...

This work presents a dynamic analysis for an anaerobic digester, supported on the analytical application of the indirect Lyapunov method. The mass-balance model considered is based on two biological reaction pathways and involves both Monod and Haldane representations of the specific biomass growth rates. The dilution rate, the influent concentrati...

This work presents the analysis of turbidity removal in water from a natural source, via coagulation/flocculation using plantain starch. A random factorial experimental design was formulated with four variable factors: pH, coagulant dose, rapid mixing speed and slow mixing speed. The jar test was carried out in order to determine the optimal values...

In this work an anaerobic digester is controlled using input-output linearization and Lyapunov-like function methods. It is assumed that model parameters are unknown, time-varying, and bounded, and upper or lower bounds are also unknown. To tackle the effect of input saturation, a state observer is designed. The tracking and observer errors are def...

This work presents the analysis of turbidity removal in water from a natural source, via coagulation/ flocculation using plantain starch. A random factorial experimental design was formulated with four variable factors: pH, coagulant dose, rapid mixing speed and slow mixing speed. The jar test was carried out in order to determine the optimal val...

coagulación/ floculación/ sedimentación (CFS). Se empleó el diseño estadístico 2k para establecer la configuración de la variación de los parámetros independientes y el número de pruebas necesarias. INTRODUCCIÓN El proceso de coagulación/ floculación/ sedimentación (CFS) ha sido muy usado para remoción de sólidos suspendidos en tratamiento de aguas...

The motor speed of a buck power converter and DC motor coupled system is controlled by means of a quasi-sliding scheme. The fixed point inducting control technique and the zero average dynamics strategy are used in the controller design. To estimate the load and friction torques an online estimator, computed by the least mean squares method, is use...

In this work an adaptive strategy for state dependent switching systems in Brunovsky form is presented. Lyapunov direct method is used to derive the adaptive control law to track a given reference signal. The resulting controller is equipped with a set of adaptive gains able to tackle plant commutations. Control gains are adapted through a feedback...

This paper shows the controller design for a second-order plant with unknown varying behavior in the parameters and in the disturbance. The state adaptive backstepping technique is used as control framework, but important modifications are introduced. The controller design achieves mainly the following two benefits: upper or lower bounds of the tim...

In this work a two-valued state feedback control is developed for a plant of second order with known constant coefficients and no disturbance, and for a plant with unknown varying coefficients and additive disturbance with known upper and lower bounds. A reference model is used in order to avoid large commutation rate of the control input. In the f...

In this work an adaptive controller for an anaerobic digester is developed taking into account the input constraints. The following assumptions are considered: (i) the biomass and chemical oxygen demand concentrations are unknown, (ii) the model parameters are unknown and vary but they are bounded, and (iii) the upper or lower bounds of model param...

We propose a scheme for nonlinear plants with time-varying control gain and time-varying plant coefficients, on the basis of a plant model consisting of a Brunovsky-type model with polynomials as approximators. We develop an adaptive robust control scheme for this plant, under the following assumptions: (i) the plant terms involve time-varying but...

In this work a two-valued state feedback control for a plant of second order with known constant coefficients and an additive bounded disturbance is designed. In this controller the control signal can take only two possible values. The controller design is based on Lyapunov-like function method, achieving the convergence of the tracking error to a...

In this paper an adaptive controller for bioreactors is developed, using a mass balance model based on an unique biological reaction pathway. The control scheme is constructed from Lyapunov-like function method and an extended Luenberger observer which allows handling the control input saturation. The measured methane flow rate is used to handle th...

Nonlinear dynamics is ubiquitous in engineering systems. As some parameters are varied bifurcations arise in the state variables. Generically, when one parameter changes, Hopf and fold bifurcations are found. Other ones can also be present due to special systems characteristics, such as symmetries. Knowing in advance the significant bifurcation sce...

This paper presents the bifurcation analysis in an anaerobic upflow fixed bed bioreactor, which is an anaerobic digestion system useful for wastewater treatment. In the dynamic analysis part, the equilibrium points, linear stability and bifurcation curves are studied, focusing in the washout condition. For the self tuning regulator the parameter es...

En este artículo se presenta el análisis dinámico y el diseño de un regulador autosintonizado para un biorreactor anaerobio de lecho fijo de flujo ascendente, utilizado para tratamiento de aguas residuales. Se ha demostrado de manera analítica que la condición de arrastre en el reactor se obtiene por una combinación de una bifurcación transcrítica...

In this paper the feedback linearization control technique is used for controlling an anaerobic upflow fixed bed reactor, which is used for the degradation of wine distillery waste water. The concentration of the volatile fatty acids is used as the output and the dilution rate is used as the control input. Given the closed loop system to be control...

La simulación de la síntesis de n-Butilacetato por Destilación Reactiva (DR), se hizo con base en el Análisis de la Estática (AE), teniendo en cuenta un pequeño exceso de n-butanol/ácido acético en la corriente de alimentación. Los esquemas tecnológicos simulados consisten de un reactor de equilibrio antes de la columna reactiva y la columna de des...