Papers by Nohe Cazarez-Castro
Studies in computational intelligence, 2010
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Studies in computational intelligence, Jul 13, 2018
The chapter describes an alternative of fuzzy-based sliding mode control (FSMC) with a self-adjus... more The chapter describes an alternative of fuzzy-based sliding mode control (FSMC) with a self-adjusting fuzzy system. The introduced auto-tuner is based on the relay control approach where a limit cycle is exhibited at the output of the closed-loop system. The amplitude of oscillations is considered in order to move the centers of membership functions such that the absence of oscillations is assured for the fuzzy controller. Finally, numerical simulations verify the feasibility of the proposed algorithm.
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IEEE Transactions on Fuzzy Systems, Jun 1, 2022
Unmatched disturbances affect most of the mechanical systems, and finding conditions in the contr... more Unmatched disturbances affect most of the mechanical systems, and finding conditions in the controllers for its attenuation still represent a challenge. We present sufficient conditions to guarantee asymptotic stability of single-input single-output systems driven by integral fuzzy-based sliding mode control. The stability analysis made in the Lyapunov framework gives the tuning conditions of the fuzzy system to preserve the robustness against bounded persistent, matched and unmatched disturbances. The theoretical results are numerically and experimentally validated in a one-link pendulum.
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Complex., 2021
The aim of this work is the design of an adaptive controller based on Mamdani-type fuzzy inferenc... more The aim of this work is the design of an adaptive controller based on Mamdani-type fuzzy inference systems. The input control is constructed with saturation functions’ fuzzy-equivalents, which works as the adaptive scheme of the controller. This control law is designed to stabilize the error system to synchronize a pair of chaotic nonhomogeneous piecewise systems. Finally, an illustrative example as numerical evidence is developed.
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Engineering Applications of Artificial Intelligence, 2018
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Numerical and Evolutionary Optimization – NEO 2017, 2018
Vertical structures such as buildings, bridges and trusses are subjected to strong changes with r... more Vertical structures such as buildings, bridges and trusses are subjected to strong changes with respect to their original state of design due to different external disturbances. Seismic waves are leading sources of disturbances giving rise to lateral displacements, as well as vertical and angular deformations, which increase the risk of structural failure compromising the structure integrity. In order to prevent catastrophic failures in structures and its subsequent side effects, in this work we propose a scheme for the attenuation of the vibration effects in vertical structures by means of a control system based on a Mamdani-type fuzzy inference system. The fuzzy rules of the controller were designed such that the close loop system is guaranteed to satisfy the Lyapunov stability criterion. Numerical simulations were performed to evaluate the best performance and effectiveness of fuzzy control, considering that the controller is placed at different levels of the building and inducing as perturbations signals that approximate a seismic event. The results show that the proposed controller attenuates the vibration in the structure accomplishing the control objective.
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Numerical and Evolutionary Optimization – NEO 2017, 2018
The water quality problem is a world-wide challenge for human development. Traditionally, since t... more The water quality problem is a world-wide challenge for human development. Traditionally, since the 1960’s water quality evaluation has been promoted through the application of various quality or pollution indexes. However, these indexes present excessive divergence and little complementarity that have not allowed to advance toward a unified system of globalized application due to the quantity, the range and the complexity of parameters. We propose a Takagi-Sugeno type fuzzy system to classify and make decisions about treated water reuse for direct or indirect contact activities. The fuzzy system design is based on expert knowledge, and considers guidelines established in mexican and international standards about pollution and water quality indexes. The coefficients in some rule consequents of the fuzzy system were determined by solving an optimization problem through a genetic algorithm. The classification performance of the fuzzy system was verified using real data of a water treatment plant through a leave-one-out cross validation and with an analysis of variance for the pollution indexes assessments.
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Based on the design of a proportional integral controller, the intention is to eliminate the exis... more Based on the design of a proportional integral controller, the intention is to eliminate the existing error between the level of planned inventory and the actual level in the different parts of the supply chains of goods and services. It is considered necessary to increase the performance of this indicator to optimize the inventory holding costs by improving the profitability of the companies of the multiple chains. A PI controller was developed according with the material balance equation, adjusted to the dynamic models of the supply chains. Likewise, the network elements were classified into producers and non-producers and saturation functions were assigned to each group. Subsequently, the system was simulated incorporating two types of deterministic demands: the first one constant in time and the second one with a variation by season. A linear relationship between the supply volumes was also established for those segments of the chain that have more than one supplier at the same ...
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Computación y Sistemas, 2018
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Evolutionary Design of Intelligent Systems in Modeling, Simulation and Control, 2009
In this paper Fuzzy Logic Systems (FLS) for controlling non-minimumphase systems are proposed. A ... more In this paper Fuzzy Logic Systems (FLS) for controlling non-minimumphase systems are proposed. A generalized Proportional Integral Derivative (PID) Fuzzy Logic Controller (FLC) for a benchmarking second order problemwith an unstable zero is presented. The same Fuzzy Rule Base (FRB) of the PID FLC is used in a PD FLC to regulate a plant consisting in a non-minimum-phase servomechanism with
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IEEE Transactions on Fuzzy Systems
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Automatika
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Electrical Engineering
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Integration
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Fuzzy Sets and Systems
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Mathematical and Computational Applications
In this work, a generalization of a synchronization methodology applied to a pair of chaotic syst... more In this work, a generalization of a synchronization methodology applied to a pair of chaotic systems with heterogeneous dynamics is given. The proposed control law is designed using the error state feedback and Lyapunov theory to guarantee asymptotic stability. The control law is used to synchronize two systems with different number of scrolls in their dynamics and defined in a different number of pieces. The proposed control law is implemented in an FPGA in order to test performance of the synchronization schemes.
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IEEE Latin America Transactions
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Theoretical Biology and Medical Modelling
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Revista Iberoamericana de Automática e Informática Industrial RIAI
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Papers by Nohe Cazarez-Castro