Irma Pérez

Hospital de Especialidades

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Gerardo Romero

Autonomous University of Tamaulipas

David Lara

Tecnológico Nacional de México

Iván M. Díaz

Universidad Politécnica de Madrid

René Fernando Domínguez-Cruz

Autonomous University of Tamaulipas

Aldo Méndez

Autonomous University of Tamaulipas

Marco A. Panduro

Center for Scientific Research and Higher Education at Ensenada

J. A. Guerrero

University of Michigan–Ann Arbor

Terri Heaphy

Cleveland Hearing & Speech Center

Daniel Flores-Araiza

Tecnológico de Monterrey

Jaime Arredondo

Autonomous University of Tamaulipas

Cooperative Institutions

Autonomous University of Tamaulipas

Tecnológico de Monterrey

Universidad Autónoma de Nuevo León

Cheikh Anta Diop University

Centre Hospitalier National Universitaire de Fann

Center for Scientific Research and Higher Education at Ensenada

Hôpital Principal de Dakar

Universidad Politécnica de Madrid

Ziguinchor University

Hôpital Aristide Le Dantec

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New results on robust stability for differential-difference systems with affine linear parametric uncertainty

International Journal of Systems Science (2011)

Gerardo Romero Iván M. Díaz Irma Pérez Alfredo Guerrero David Lara

This article presents sufficient conditions to verify the robust stability property of convex combinations for quasipolynomials that represent the characteristic equation of differential-difference dynamics systems. It considers affine linear parametric uncertainty structure in the coefficients of quasipolynomials and also, interval uncertainty in the time delay. First of all, a transformation of the delay's operator is performed in order to get a two variable polynomial; after this, to obtain the robust stability property, a result based on the Hurwitz matrix is applied.

10.1080/00207721.2011.577247

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Citations (3)

Attitude Control of a Quadrocopter Using Adaptive Control Technique

Applied Mechanics and Materials (2014)

Ramiro Ibarra S. Florida Wenceslao Eduardo Rodríguez Gerardo Romero David Lara

This paper presents an application of the MRAC (Model Reference Adaptive Control) techniques to achieve the attitude stabilization in an unmanned aerial vehicle (UAV) type quadrotor when there exists disturbances and/or uncertainties in the parameters due to changes in the payload, variations in battery voltage during flight, etc. This is achieved by performing an online adaptation of the controller parameters, which are obtained by showing the stability property of the closed loop control system using Lyapunov theory. Simulation results using Matlab-Simulink platform are presented to demonstrate the convergence of the controller parameters.

Payload (computing)

Lyapunov stability

10.4028/www.scientific.net/amm.598.551

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Identification and PID control for a quadrocopter

Irma Pérez Daniel Flores-Araiza Jesús Anselmo Fortoul-Diaz R. Maximo Hugo G. González-Hernández

Identification and control of unmanned aerial vehicles (UAV) has been a topic of interest in recent years due to several applications they are used for, some examples could be: surveillance or cooperative robotics. This paper shows the parameter identification and control of the AR Drone®, a quadrocopter from Parrot®; the parameter identification was achieved using experimental data from the physical system. For the control part a PID control was used to regulate all the variables of the Drone.

Drone

Identification

10.1109/conielecomp.2014.6808571

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Robust Absolute Stability of Lur’e Systems with Polynomic Parametric Uncertainty

Gerardo Romero J. A. Guerrero Aldo Méndez René Fernando Domínguez-Cruz Irma Pérez

This paper presents new results to verify the robust absolute stability property of the Lur'e systems. As it is known, to solve the problem of robust absolute stability, the strict positive realness property (SPR) of a fictitious transfer function needs to be verified. In the present work, a fictitious transfer function with polynomic parametric uncertainty is considered. To verify the robust SPR property of this type of functions, an algorithm, based on the sign decomposition technique, is designed. This algorithm is codified in C language obtaining some advantages compared to others.

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Robust stability analysis for a class of linear time-delay systems

2022 European Control Conference (ECC) (2007)

Gerardo Romero Iván M. Díaz Irma Pérez

This paper presents sufficient conditions to verify the robust stability property of convex combinations for quasipolynomials which they represent the characteristic equation of differential-difference dynamics systems. It considers affine linear parametric uncertainty structure in the coefficients of quasipolynomials and also, interval uncertainty in the time delay. First of all, a transformation of the delay's operator is performed in order to get a two variable polynomial; after this, to obtain the robust stability property, a result based on the Hurwitz matrix is applied.

Routh–Hurwitz stability criterion

10.23919/ecc.2007.7068999

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Citations (1)

Graphical Method for Robust Stability Analysis for Time Delay Systems: A Case of Study

InTech eBooks (2016)

Gerardo Romero David Lara Irma Pérez Esmeralda Lopez

This chapter presents a tool for analysis of robust stability, consisting of a graphical method based on the construction of the value set of the characteristic equation of an interval plant that is obtained when the transfer function of the mathematical model is connected with a feedback controller. The main contribution presented here is the inclusion of the time delay in the mathematical model. The robust stability margin of the closed-loop system is calculated using the zero exclusion principle. This methodology converts the original analytic robust stability problem into a simplified problem consisting on a graphic examination; it is only necessary to observe if the value-set graph on the complex plane does not include the zero. A case of study of an internal combustion engine is treated, considering interval uncertainty and the time delay, which has been neglected in previous publications due to the increase in complexity of the analysis when this late is considered.

10.5772/63158

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Apport de l’imagerie non invasive dans le diagnostic des dissections artérielles cervicales: à propos d’une série de trois observations.

Journal Africain d'Imagerie Médicale (2015)

Chérif Mohamadou Aidara Irma Pérez Chanarith Yiem Abdoulaye Dione Diop Abdoulaye Ndoye Diop

Les dissections arterielles cervicales representent 20% des causes d’ischemie cerebrale chez le sujet de moins de 45 ans. Il s’agit d’une effusion de sang dans la paroi arterielle dissequant ses feuillets parietaux. Sa gravite reside dans le retentissement encephalique hemodynamique. La dysplasie arterielle en est le lit habituel. Elle rend compte des alterations de la paroi arterielle commune a toutes les maladies induisant des modifications de la matrice extra cellulaire. Cette entite pathologique est mieux connue grâce au progres de l’imagerie non invasive dont les performances repoussent sans cesse les indications de l’arteriographie. Nous illustrons dans cet article l’apport de l’imagerie non invasive dans cette affection dont les mecanismes physiopathologiques radiologiques et evolutifs repondent a l’hematome de paroi et ses consequences hemodynamiques cevico-encephaliques.

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New Results to Verify the Robust Stability Property of Interval Plants with Time-Delay1

IFAC Proceedings Volumes (2012)

Gerardo Romero Pedro Zamora Iván M. Díaz Irma Pérez David Lara

Kharitonov's theorem

10.3182/20120622-3-us-4021.00050

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Citations (1)

Robust stability analysis of the hot-dip galvanising control system

International Journal of Automation and Control (2007)

Gerardo Romero Luis Antonio Ribot García Irma Pérez René Fernando Domínguez-Cruz Marco A. Panduro

This paper presents new results to compute the robustness margin of the hot-dip galvanising control system. Compared to previous works on this issue, this paper considers a mathematical model of the plant with two inputs and one output. The inputs are used to regulate the output, which represents the Zinc mass coating of steel strip. To achieve this objective, a multivariable PI controller is used, this controller is tuned applying the well known Ziegler and Nichols method, and then the maximum parametric uncertainty is computed in order to guarantee the stability property of the closed-loop control system. The work bases its results on the value set characterisation for interval plants with uncertain time delay, along with the use of the zero exclusion principle. Both results allow to transform the original robust stability problem into a simple visual inspection of a computer aided built graph.

Robustness

10.1504/ijaac.2007.014021

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Citations (5)

Robust Absolute Stability Using Polynomial Positivity and Sign Decomposition

Springer eBooks (2006)

J. A. Guerrero Gerardo Romero Aldo Méndez René Fernando Domínguez-Cruz Marco A. Panduro

Absolute (philosophy)

10.1007/3-540-34774-7_54

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