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Dynamic Discontinuous Control for Active Control of Mechanical Vibrations Control discontinuo dinámico para control activo de vibraciones mecánicas
Orestes Llanes Santiago,Alberto Prieto Moreno
Revista Cubana de Ingeniería , 2010, DOI: 10.1234/rci.v1i1.4
Abstract: This article shows the use of the discontinuous control using dynamic sliding modes for the active isolation of vibrations in mechanical systems. This type of control law constitutes a robust feedback control policy due to its insensitivity to external disturbance inputs, certain immunity to model parameter variations, within known bounds, and to the ever present modelling errors. The whole theoretical analysis is applied to a lineal model of two degrees of freedom of the vehicle's suspension where the irregularities of the land represent of direct way the external interferences to the system . To carry out the isolation an electro-hydraulic operator it is used. Simulations are performed which validate the proposed approach. Se muestra el uso del control discontinuo usando regímenes deslizantes dinámicos para el aislamiento activo de vibraciones en sistemas mecánicos. Este tipo de ley de control constituye una política de control robusta debido a que no es sensible a entradas de perturbación externas, presenta cierta inmunidad a variaciones en los parámetros del modelo, dentro de un rango conocido y, a los errores siempre presentes en la modelación. Todo el análisis teórico es aplicado a un modelo lineal de dos grados de libertad de la suspensión de un vehículo donde las irregularidades del terreno representan, de manera directa perturbaciones externas al sistema. Para realizar el aislamiento se utiliza un actuador electrohidráulico. El enfoque propuesto fue validado a través de simulaciones por computadora.
A proposal to fault diagnosis in industrial systems using bio-inspired strategies
Camps Echevarría,Lídice; Llanes Santiago,Orestes; Silva Neto,Antonio J;
Ingeniare. Revista chilena de ingeniería , 2011, DOI: 10.4067/S0718-33052011000200009
Abstract: in this work a study on the application of bio-inspired strategies for optimization to fault diagnosis in industrial systems is presented. the principal aim is to establish a basis for the development of new and viable model-based fault diagnosis methods which improve some difficulties that the current methods cannot avoid. these difficulties are related mainly with fault sensitivity and robustness to external disturbances. in this study, there have been considered the differential evolution and the ant colony optimization algorithms. this application is illustrated using simulated data of the two tanks system benchmark. in order to analyze the advantages of these algorithms to obtain a diagnosis which needs to be sensitive to faults and robust to external disturbances, some experiments with incipient faults and noisy data have been simulated. the results indicate that the proposed approach, basically the combination of the two algorithms, characterizes a promising methodology for fault diagnosis.
Diagnóstico de Fallos en Sistemas Híbridos Mediante Anidamiento Latente de Fallos
Leonardo Rodríguez Urrego,Emilio García Moreno,Francisco Morant Anglada,Orestes Llanes Santiago
Ingenier?-a Electr?3nica, Autom??tica y Comunicaciones , 2010, DOI: 10.1234/rielac.v29i3.33
Abstract:
Diagnóstico de fallos en el generador de vapor BKZ-340-140-29M
Mayelín Torres Vizcaya,Tomás Rodríguez Barrios,Alberto Prieto Moreno,Orestes Llanes Santiago
Ingenier?-a Electr?3nica, Autom??tica y Comunicaciones , 2011, DOI: 10.1234/rielac.v32i2.80
Abstract: Este trabajo presenta el dise o de un sistema de diagnóstico de fallos para un generador de vapor BKZ-340-140-29M, ubicado en la Central Termoeléctrica (CTE) Máximo Gómez de Mariel, Cuba. El diagnosticador dise ado utiliza un árbol de decisión, que permite el diagnóstico de los poros en el sobrecalentador y el economizador. Estos equipos fueron seleccionados partiendo de un estudio estadístico, que demuestra su gran incidencia en la disponibilidad de los bloques de la CTE Máximo Gómez
Inverse and direct modeling applied in the estimation of kinetic parameters of BSA adsorption
Diego Pinto Costa,Le?ncio Diógenes Tavares Camara,Mirtha Irizar Mesa,Orestes Llanes Santiago
Ingenier?-a Electr?3nica, Autom??tica y Comunicaciones , 2010, DOI: 10.1234/rielac.v30i3.59
Abstract: The kinetic modeling applied in the parameters estimation of chromatographic adsorption processes is an important tool in the understanding and improvement of these separation systems. In this work, two kinetic models were utilized in the parameters estimation of BSA adsorption. The correlations between the irreversible kinetic model and the reversible kinetic model with the experimental data were carried out using the Linear Driving Force and the Random Restricted Window (R2W) method, respectively. From both models was possible to achieve a good fit with the experimental data, obtaining parameters with higher accuracy due to the low residues of the cost function.
Una propuesta para el diagnóstico de fallos en sistemas industriales mediante el uso de estrategias bioinspiradas A proposal to fault diagnosis in industrial systems using bio-inspired strategies
Lídice Camps Echevarría,Orestes Llanes Santiago,Antonio J Silva Neto
Ingeniare : Revista Chilena de Ingeniería , 2011,
Abstract: In this work a study on the application of bio-inspired strategies for optimization to Fault Diagnosis in industrial systems is presented. The principal aim is to establish a basis for the development of new and viable model-based Fault Diagnosis Methods which improve some difficulties that the current methods cannot avoid. These difficulties are related mainly with fault sensitivity and robustness to external disturbances. In this study, there have been considered the Differential Evolution and the Ant Colony Optimization algorithms. This application is illustrated using simulated data of the Two tanks system benchmark. In order to analyze the advantages of these algorithms to obtain a diagnosis which needs to be sensitive to faults and robust to external disturbances, some experiments with incipient faults and noisy data have been simulated. The results indicate that the proposed approach, basically the combination of the two algorithms, characterizes a promising methodology for Fault Diagnosis. En el presente trabajo se presenta un estudio sobre la aplicación de estrategias bioinspiradas para la optimización al diagnóstico de fallos en sistemas industriales. El objetivo principal es establecer una base para el desarrollo de nuevos y viables métodos de diagnóstico de fallos basados en modelos que permitan mejorar las dificultades de los métodos actuales. Estas dificultades están relacionadas, fundamentalmente, con la sensibilidad ante la presencia de fallos y la robustez ante perturbaciones externas. En el estudio se consideraron los algoritmos Evolución Diferencial y Optimización por Colonia de Hormigas. La efectividad de la propuesta es analizada mediante experimentos con el conocido problema de prueba de los dos tanques. Los experimentos consideraron presencia de ruido en la información y fallos incipientes de manera que fuera posible analizar las ventajas de la propuesta en cuanto a diagnóstico robusto y sensible. Los resultados obtenidos indican que el enfoque propuesto y, principalmente, la combinación de los dos algoritmos, caracterizan una metodología prometedora para el diagnóstico de fallos.
Estudio comparativo de clasificadores empleados en el diagnóstico de fallos de sistemas industriales
Bernal-de Lázaro,José M.; Prieto-Moreno,Alberto; Llanes-Santiago,Orestes; García-Moreno,Emilio;
Ingenier?-a Mec??nica , 2011,
Abstract: this paper, presents a comparative study of the performance of four classification techniques very used in fault diagnosis of industrial processes. the selected techniques were: k-nearest neighbor (k-nn), partial least-squares (pls), artificial neuronal networks (ann) and support vector machines (svm). the comparison is based in the classification capacity of the historical data and the generalization using new observations. the four techniques are applied to historical data of the known benchmark tennessee eastman industrial process. the comparison permitted to prove as the generalization capacity of the classification techniques grow with the complexity of classifiers without to increase the computational effort in the fault diagnosis.
Dise o basado en diagnóstico de fallos y sistemas híbridos aplicado en un equipo de desfibrilación ventricular Design based on fault diagnosis and hybrid systems applied to a ventricular defibrillator device
Alberto Prieto Moreno,Orestes Llanes-Santiago,Alejandro Milanés-Cruz,José Folgueras-Méndez
Ingeniare : Revista Chilena de Ingeniería , 2012,
Abstract: En este artículo se presenta una propuesta de procedimiento que incorpora el diagnóstico de fallos desde la fase de dise o de un equipo de desfibrilación ventricular. Lo anterior permite resolver un grupo de limitaciones que están presentes actualmente en el dise o de sistemas electrónicos. El procedimiento propuesto utiliza el concepto de dise o basado en diagnóstico, la técnica de composición de autómatas híbridos para el modelado y diagnóstico basado en el conocimiento de los expertos. Finalmente se dise a el sistema con el diagnosticador ya incorporado. El procedimiento utilizado puede ser extendido a otros tipos de sistemas. This article presents a proposal of procedure to incorporate the fault diagnosis from the design phase of ventricular defibrillation equipment. This solves a set of constraints that are currently present in the design of electronic systems. The proposed procedure uses the concept of diagnosis-based design, the technique of composition of hybrid automata modeling and diagnosis based on expert knowledge. Finally the system is designed with the fault diagnostic system incorporated. The procedure can be extended to other types of systems.
Dise?o basado en diagnóstico de fallos y sistemas híbridos aplicado en un equipo de desfibrilación ventricular
Prieto Moreno,Alberto; Llanes-Santiago,Orestes; Milanés-Cruz,Alejandro; Folgueras-Méndez,José; García-Moreno,Emilio; Morant-Anglada,Francisco;
Ingeniare. Revista chilena de ingeniería , 2012, DOI: 10.4067/S0718-33052012000100006
Abstract: this article presents a proposal of procedure to incorporate the fault diagnosis from the design phase of ventricular defibrillation equipment. this solves a set of constraints that are currently present in the design of electronic systems. the proposed procedure uses the concept of diagnosis-based design, the technique of composition of hybrid automata modeling and diagnosis based on expert knowledge. finally the system is designed with the fault diagnostic system incorporated. the procedure can be extended to other types of systems.
Elementos de predicción pronóstica en la nefropatía primaria por inmunoglobulina A
Benítez Llanes,Orestes; Gómez Barry,Hilario; Casta?er Moreno,Juan; Fuentes Abreu,Jorge;
Revista Cubana de Medicina , 2003,
Abstract: 356 kidney biopsies performed to 346 patients from october 31, 1988, to october 31, 1999, were analyzed. it was proved that 66.5 % (230/346) had primary glomerulopathy and that iga primary nephropathy (igapn) accounted for 7.2 % (25/346) of the total of biopsies performed and for 10.9 % (25/230) of primary glomerular diseases. the following variables were analyzed: age, sex, race, blood pressure readings, persistent proteinuria, histological pattern and kidney function. average age was 23.8 ± 7.6. it was found that the white patients (18/25; 72.0 %) and the males (in a ratio of 2.6:1) were the most affected. at the end of the study, 20 % of the patients (5/25) with iganp presented different degrees of renal failure, with a very significant statistical association (p < 0.01) when the kidney dysfunction was related to maintained arterial hypertension, a histological pattern of diffuse mesangial proliferative glomerulonephritis (dmpgn) and interstitial fibrosis in the histological study obtained by kidney biopsy. it was concluded that the mantained presence of aht, a histological pattern of dmpgn and the finding of interstitial fibrosis represented a poor prognosis in the evolution of the disease.
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