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Item type:Publication, Fault detection and isolation system based on structural analysis of an industrial seawater reverse Osmosis desalination plant(MDPI, 2020-09-01)Currently, the use of industrial seawater reverse osmosis desalination (ISROD) plants has increased in popularity in light of the growing global demand for freshwater. In ISROD plants, any fault in the components of their control systems can lead to a plant malfunction, and this condition can originate safety risks, energy waste, as well as affect the quality of freshwater. This paper addresses the design of a fault detection and isolation (FDI) system based on a structural analysis approach for an ISROD plant located in Lima (Peru). Structural analysis allows obtaining a plant model, which is useful to generate diagnostic tests. Here, diagnostic tests via fault-driven minimal structurally overdetermined (FMSO) sets are computed, and then, binary integer linear programming (BILP) is used to select the FMSO sets that guarantee isolation. Simulations shows that all the faults of interest (sensors and actuators faults) are detected and isolated according to the proposed design. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of a robust H2 state feedback temperature controller for a steel slab reheating furnace(MDPI, 2020-03-01)This article addresses the design of a robust H2 state feedback controller (H2-SFC) for the effective temperature control in the heating zone of the steel slab reheating furnace. Based on the available field data and system identification procedures, a mathematical model of the heating zone is derived, which presents autoregressive-moving average with exogenous input (ARMAX) structure and fourth order. The design of an H2-SFC controller for the effective control of the heating zone temperature of the slab reheating furnace under study is developed. The simulation results of the designed control system showed its high effectiveness compared to the conventional PID control. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Distributed fault detection and isolation approach for oil pipelines(MDPI, 2021-12-01)Fault detection and isolation (FDI) in oil pipeline systems (OPS) is a very critical issue because faults in these systems such as leaks or equipment malfunctions may cause significant safety accidents and economic losses. These are the challenging factors, along with the environmental regulations for developing efficient FDI approaches for OPS. This paper proposes a model-based distributed FDI approach, which uses a structural model of the system in conjunction with algorithms to generate diagnostic tests that may be implemented in local diagnosers along the OPS. The proposed approach allows detection and isolation of faults in pipeline sections (pipeline segments), pump stations, as well as process control equipment. In this way, simulation of the obtained diagnostic tests in a benchmark application shows that all faults of interest (pipeline segment faults and sensor faults) are detected and isolated. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, State feedback temperature control based on a Smith predictor in a precalciner of a cement kiln(IEEE Computer Society, 2021-01-01)This paper proposes the design of a state feedback Smith predictor controller (SFC-SP) for the effective temperature control in a precalciner of a cement rotary kiln. The dynamic model of this process is obtained from real-time data by applying a system identification procedure. This identification procedure yields a fourth order with dominant time delay transfer function. A state feedback controller combined with a Smith predictor is therefore designed which behaves effectively. Simulated results compare the performance of the proposed controller with a standard PID controller. Two performance indexes have been used in this comparison: the integral absolute error (IAE), and the control effort (EU). Simulations show that the proposed controller provides lower values of these indexes and, therefore, outperforms the standard PID controller in terms of performance and accuracy - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of a dead-time compensator robust H∞ state feedback temperature controller for a precalciner of a cement rotary kiln(MDPI, 2022-03-01)A dead‐time compensator robust H∞ state feedback controller (DTC‐H∞‐SFC) for the temperature control in a precalciner of a cement rotary kiln is designed. A mathematical model of the process under study with ARMAX structure was obtained. A dead‐time compensator robust H∞ state feedback controller is therefore designed. The results of the comparative evaluation of the DTC‐H∞‐SFC vs. DTC+PI designed controllers showed that the DTC‐H∞‐SFC gives improved performance of the control system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Adaptive Smith predictor controller design for industrial processes with time-varying time delay(Elsevier B.V., 2024-01-01)The design of an adaptive Smith predictor controller for control of industrial hydraulic processes subjected to the simultaneous effect of load disturbances and time-varying time-delay is developed in this paper. In order to improve the performance of the Smith predictor, an adaptive block is introduced into the control structure to estimate and update the current value of the time-varying time-delay. Furthermore, a disturbance compensator is introduced to reject the effect of load disturbances. Simulations of the control system are carried out with the proposed controller and with a classical Smith predictor. The comparison of the obtained results shows the higher performance of our proposed controller, both in rejecting load disturbances and in maintaining the closed-loop stability when the time-delay is time-varying. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Nonlinear Robust Control by a Modulating-Function-Based Backstepping Super-Twisting Controller for a Quadruple Tank System(MDPI, 2023-06-01)In this paper, a robust nonlinear approach for control of liquid levels in a quadruple tank system (QTS) is developed based on the design of an integrator backstepping super-twisting controller, which implements a multivariable sliding surface, where the error trajectories converge to the origin at any operating point of the system. Since the backstepping algorithm is dependent on the derivatives of the state variables, and it is sensitive to measurement noise, integral transformations of the backstepping virtual controls are performed via the modulating functions technique, rendering the algorithm derivative-free and immune to noise. The simulations based on the dynamics of the QTS located at the Advanced Control Systems Laboratory of the Pontificia Universidad Católica del Perú (PUCP) showed a good performance of the designed controller and therefore the robustness of the proposed approach. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of a Robust MPC for Copper Recovery in an Industrial Flotation Column(Elsevier B.V., 2023-07-01)This paper presents the design of a RMPC (Robust Model Predictive Controller) for effective control of the copper recovery in an industrial flotation column. Copper ore properties vary frequently causing uncertainties and disturbances in the dynamics of the recovery process in the flotation column. Using the system identification tools, a MIMO model of this plant was achieved, whose validation results exhibited adequacy degrees of 88.21% for froth depth, and 87.32% for air holdup. The design of the RMPC was carried out based on the nominal MIMO model and its obtained uncertainties. It was demonstrated that the designed RMPC makes it possible to control the process with high precision under various industrial operation scenarios. The simulation results of the control system designed with the RMPC and the GPC (Generalized Predictive Controller) revealed an improved performance when using the RMPC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Time-Delay Estimation via Adaptive Modulation Functions for Robust MPC in Flotation Columns with Soft Sensors(RELX Group (Netherlands), 2026-01-01)