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Prof. Luis Alvarez-Icaza
Universidad Nacional Autónoma de México

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0 Transportation
0 Traffic Cellular Automata
0 Sustainable mobility planning
0 traffic modelling

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Research article
Published: 25 July 2021 in Journal of Applied Electrochemistry
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Obtaining precise reducer order battery models is a key component in designing lithium-ion battery management systems. In general, with conventional order reduction techniques, low order is followed by low accuracy. To overcome such limitation, this paper presents a frequency-based constructive method to obtain broad-band low-order approximations of the solid-phase lithium-ion diffusion submodel, the core of the reference pseudo-two-dimensional electrochemical model of lithium-ion cells. The proposed method is a combination of an improvement on the residue grouping technique and of standard balancing and truncation/residualization methods borrowed from control systems theory. As main result, dramatic order reductions from 3000th to 5th-order with minimum accuracy losses are obtained. Taking a well-known case-study of a lithium-ion battery model, it is shown that 5th-order models offer approximations with maximum absolute errors of 0.5%, for characteristic times up to \(9.54\times 10^4~\text {s}\). The proposed method will help to obtain accurate real-time estimations of surface concentration and state of charge of lithium-ion batteries.

ACS Style

Fernando A. Ortiz-Ricardez; Aldo Romero-Becerril; Luis Alvarez-Icaza. Residue grouping order reduction method in solid-phase lithium-ion battery models. Journal of Applied Electrochemistry 2021, 1 -15.

AMA Style

Fernando A. Ortiz-Ricardez, Aldo Romero-Becerril, Luis Alvarez-Icaza. Residue grouping order reduction method in solid-phase lithium-ion battery models. Journal of Applied Electrochemistry. 2021; ():1-15.

Chicago/Turabian Style

Fernando A. Ortiz-Ricardez; Aldo Romero-Becerril; Luis Alvarez-Icaza. 2021. "Residue grouping order reduction method in solid-phase lithium-ion battery models." Journal of Applied Electrochemistry , no. : 1-15.

Journal article
Published: 28 June 2021 in Measurement Science and Technology
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ACS Style

Roberto G Ramírez-Chavarría; Bryan E Alvarez-Serna; Maarten Schoukens; Luis Alvarez-Icaza. Data-driven modeling of impedance biosensors: a subspace approach. Measurement Science and Technology 2021, 32, 104009 .

AMA Style

Roberto G Ramírez-Chavarría, Bryan E Alvarez-Serna, Maarten Schoukens, Luis Alvarez-Icaza. Data-driven modeling of impedance biosensors: a subspace approach. Measurement Science and Technology. 2021; 32 (10):104009.

Chicago/Turabian Style

Roberto G Ramírez-Chavarría; Bryan E Alvarez-Serna; Maarten Schoukens; Luis Alvarez-Icaza. 2021. "Data-driven modeling of impedance biosensors: a subspace approach." Measurement Science and Technology 32, no. 10: 104009.

Journal article
Published: 17 May 2021 in IEEE Access
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The use of smartphones has become an inherent part of daily human life. It allows users to keep personal information, emails, pictures, social media accounts, and financial data in one place. Consequently, smartphones are an attractive target for malware developers to spread malicious content, aiming at extracting information without the user’s knowledge. Therefore, understanding malware propagation characteristics could provide a means to evaluate how they behave in order to plan security solutions accordingly. Bluetooth antennas are a channel for spreading malware through smartphones, where the probability of infection, similar to biological viruses, depends mainly on the attacker’s physical proximity. This work presents a model based on cellular automata and epidemiological compartmental models for studying the spatial and temporal propagation of Bluetooth worms in smartphones. The proposed model incorporates the individual characteristics of each device, such as security settings, latency time, operating system, different classes of Bluetooth antennas (range and transfer rate), and different user mobility patterns. Several simulation scenarios are analyzed in order to study the spreading dynamics of Bluetooth-based worms, considering the location where the outbreak begins, and the different types of antennas integrated into the smart devices. Simulation results indicated that the proposed model is appropriate for studying how the users’ demographics affect the worm’s propagation dynamics in time and space. Moreover, the model permits an analysis of the impact of users’ awareness about the risks inherent in using smart devices in Bluetooth networks, based on the acceptance of incoming communication and the effects of recovery and immunity to threats. Finally, the proposed model preserves simplicity and computational efficiency, with the possibility of extending beyond Bluetooth in order to include other transmission media.

ACS Style

Gabriel Gonzalez; Maria Elena Larraga; Luis Alvarez-Icaza; Javier Gomez. Bluetooth Worm Propagation in Smartphones: Modeling and Analyzing Spatio-Temporal Dynamics. IEEE Access 2021, 9, 75265 -75282.

AMA Style

Gabriel Gonzalez, Maria Elena Larraga, Luis Alvarez-Icaza, Javier Gomez. Bluetooth Worm Propagation in Smartphones: Modeling and Analyzing Spatio-Temporal Dynamics. IEEE Access. 2021; 9 ():75265-75282.

Chicago/Turabian Style

Gabriel Gonzalez; Maria Elena Larraga; Luis Alvarez-Icaza; Javier Gomez. 2021. "Bluetooth Worm Propagation in Smartphones: Modeling and Analyzing Spatio-Temporal Dynamics." IEEE Access 9, no. : 75265-75282.

Journal article
Published: 13 December 2020 in Sustainability
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One of the biggest challenges of our time is climate change. Every day, at different places of the world, the planet sends alarming messages about the enormous transformations it is experiencing due to human-based activities. The latter are responsible for changing weather patterns that threaten food production, energy production and energy consumption, the desertification of land, the displacement of people and animals because of food and water shortages due to the reductions in rainfall, natural disasters and rising sea levels. The effects of climate change affect us all, and if drastic measures are not considered in a timely manner, it will be more difficult and costly to adapt to the aforementioned effects in the future. Considering this context, the aim of this work is to implement a prospective study/structural analysis to the identified sectors of a regional plan of adaptation to climate change so as to promote the resilience of the region against the negative phenomena generated by the climate crisis. This was achieved in two steps: first, we identified the relationships between the strategic sectors of the plan and organized them in order of importance. Second, we assessed the effectiveness of several public policies oriented towards a city’s resilience according to their impact upon the strategic sectors of the plan and the co-benefits generated by their implementation for society. The results highlight that the most essential sectors for the mitigation of climate change are flood risk management, built environment, forest ecosystem management, human health, tourism and rise in sea level. As a consequence, the most important measures for the resilience of the North Aegean Region against climate change are the ones related to the preparation of strategic master plans for flood protection projects.

ACS Style

Ioannis Chatziioannou; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Alvarez-Icaza. A Prospective Study for the Mitigation of the Climate Change Effects: The Case of the North Aegean Region of Greece. Sustainability 2020, 12, 10420 .

AMA Style

Ioannis Chatziioannou, Efthimios Bakogiannis, Charalampos Kyriakidis, Luis Alvarez-Icaza. A Prospective Study for the Mitigation of the Climate Change Effects: The Case of the North Aegean Region of Greece. Sustainability. 2020; 12 (24):10420.

Chicago/Turabian Style

Ioannis Chatziioannou; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Alvarez-Icaza. 2020. "A Prospective Study for the Mitigation of the Climate Change Effects: The Case of the North Aegean Region of Greece." Sustainability 12, no. 24: 10420.

Erratum
Published: 06 October 2020 in Mechanical Systems and Signal Processing
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ACS Style

Antonio Concha; Luis Alvarez-Icaza; Rubén Garrido. Corrigendum to: “Simultaneous parameter and state estimation of shear buildings” [Mechanical Systems and Signal Processing, 70–71 (2016) 788–810]. Mechanical Systems and Signal Processing 2020, 149, 107288 .

AMA Style

Antonio Concha, Luis Alvarez-Icaza, Rubén Garrido. Corrigendum to: “Simultaneous parameter and state estimation of shear buildings” [Mechanical Systems and Signal Processing, 70–71 (2016) 788–810]. Mechanical Systems and Signal Processing. 2020; 149 ():107288.

Chicago/Turabian Style

Antonio Concha; Luis Alvarez-Icaza; Rubén Garrido. 2020. "Corrigendum to: “Simultaneous parameter and state estimation of shear buildings” [Mechanical Systems and Signal Processing, 70–71 (2016) 788–810]." Mechanical Systems and Signal Processing 149, no. : 107288.

Journal article
Published: 27 July 2020 in Sustainability
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Transport systems are capable of contributing to the economic robustness of a geographic area and the well-being of its inhabitants via the supply of the necessary assets for the mobility of people and goods. However, transport projects have the capacity to produce several negative externalities such as water pollution, air pollution, barrier effects, noise, and ecological impact, which affect the quality of people’s life. Considering these facts, the main purpose of this study is to indicate methodologically how the negative externalities of transport are interlinked, so that to promote sustainable mobility development. This paper reveals via the method of structural analysis, the interrelations between the negative externalities of transport, firstly to organize them hierarchically and secondly to evaluate the potential of sustainable mobility strategies concerning the co-benefits generated by their implementation for society. The results show that the negative externalities of transport are not isolated phenomena; on the contrary, they are interlinked and can be organised hierarchically according to the relationships between them so that certain public policies can be prioritized and the negative impacts of transport can be tackled more effectively. The most critical negative externalities are the invasion of public space for the construction of more roads, along with road accidents, congestion, and local air pollution. On the other hand, the most important group of strategies for sustainable mobility are the ones oriented to urban design, and more specifically to transit-oriented development.

ACS Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Chias-Becerril. A Structural Analysis for the Categorization of the Negative Externalities of Transport and the Hierarchical Organization of Sustainable Mobility’s Strategies. Sustainability 2020, 12, 6011 .

AMA Style

Ioannis Chatziioannou, Luis Alvarez-Icaza, Efthimios Bakogiannis, Charalampos Kyriakidis, Luis Chias-Becerril. A Structural Analysis for the Categorization of the Negative Externalities of Transport and the Hierarchical Organization of Sustainable Mobility’s Strategies. Sustainability. 2020; 12 (15):6011.

Chicago/Turabian Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Chias-Becerril. 2020. "A Structural Analysis for the Categorization of the Negative Externalities of Transport and the Hierarchical Organization of Sustainable Mobility’s Strategies." Sustainability 12, no. 15: 6011.

Journal article
Published: 01 July 2020 in Applied Sciences
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Transportation systems help in shaping an area’s economic health and quality of life, providing the infrastructure for the mobility of people and goods. Nevertheless, the negative externalities of car-oriented urban-metropolitan planning have heightened awareness for the need of urban planning approaches that incorporate sustainable mobility. Consequently, cities worldwide have increasingly produced sustainable mobility plans. This points to the need of creating mechanisms to implement these sustainable plans, particularly in large, complex, and fast-growing cities. This paper provides guidelines to facilitate the implementation of Sustainable Mobility Plans by focusing on the case of Mexico City. This is achieved by applying the complex large-scale integrated open systems (CLIOS) systemic analysis, in two steps: first, we facilitate the identification of the complexities and relationships among the essential systems of Mexico City’s urban structure, along with the recognition of their most important components and the institutions involved within the urban planning process. Second, we assess the effectiveness of the public policies–strategies that form part of Mexico City’s Sustainable Mobility Plan and organize them in order of importance. The results show which principal subsystems should be considered for sustainable mobility and which public policies–strategies should be prioritized in order to implement the aforementioned plan effectively.

ACS Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Chias-Becerril. A CLIOS Analysis for the Promotion of Sustainable Plans of Mobility: The Case of Mexico City. Applied Sciences 2020, 10, 4556 .

AMA Style

Ioannis Chatziioannou, Luis Alvarez-Icaza, Efthimios Bakogiannis, Charalampos Kyriakidis, Luis Chias-Becerril. A CLIOS Analysis for the Promotion of Sustainable Plans of Mobility: The Case of Mexico City. Applied Sciences. 2020; 10 (13):4556.

Chicago/Turabian Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis; Charalampos Kyriakidis; Luis Chias-Becerril. 2020. "A CLIOS Analysis for the Promotion of Sustainable Plans of Mobility: The Case of Mexico City." Applied Sciences 10, no. 13: 4556.

Articles
Published: 04 March 2020 in International Journal of Control
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In this work, a little known control technique known as pulsed control law or switched control law is studied. In general, this linear control technique has reported enlarging the stabilizing sampling period region of a sampled-data system. However, in previous works no dynamic justification has been given. Here, using a different approach to work previously done, it is shown that in a sampled-data system exposed to large stabilizing sampling periods, the control law applied as a ZOH contributes to move the system faster away from the origin as the next sampling time is approaching. It is shown this is the dynamic reason behind of the effectiveness of the pulsed control law reported in previous works. In addition, our analysis allow us to deduce conditions based on the spectrum of a linear system matrix to justify the phenomena reported previously.

ACS Style

Oriol Castillo; Héctor Benítez-Pérez; Luis Alvarez-Icaza. Novel analysis of sampled-data systems stabilised by a pulsed control signal. International Journal of Control 2020, 1 -9.

AMA Style

Oriol Castillo, Héctor Benítez-Pérez, Luis Alvarez-Icaza. Novel analysis of sampled-data systems stabilised by a pulsed control signal. International Journal of Control. 2020; ():1-9.

Chicago/Turabian Style

Oriol Castillo; Héctor Benítez-Pérez; Luis Alvarez-Icaza. 2020. "Novel analysis of sampled-data systems stabilised by a pulsed control signal." International Journal of Control , no. : 1-9.

Research article
Published: 21 January 2020 in Journal of Applied Electrochemistry
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Electrochemical models are a widespread framework to simulate lithium-ion (Li-ion) batteries and to design their battery management algorithms. To obtain numerically efficient models, the polynomial approximation (PA) is one of many order reduction techniques applied to the solid-state lithium-ion (SSLi+) diffusion equation, the core of the so-called pseudo-two-dimensional electrochemical model (P2DM). Although the validity of PA is constrained to slow-varying current scenarios, many algorithms reported in the literature to estimate the state-of-charge of Li-ion cells rely on low-order PA-based dynamic models (PADMs) derived from the P2DM. Moreover, assuming that most properties of their low-order counterparts are inherited, some authors suggest that PADMs of arbitrary high order can be used to provide very accurate approximations of the state-of-charge, even under complex operating conditions. Nevertheless, to authors knowledge, in the open literature there is not a proper analysis to support such assertion. In this paper, by introducing a systematic method to derive PADMs of arbitrary order, the ability of high-order PADMs to reproduce the average and surface concentrations described by the SSLi+ diffusion equation is investigated in time and frequency domains, with the aid of classic control systems theory techniques. The main result shows that PADMs of order greater than 2 are structurally fragile as non-minimum-phase zeros as well as spurious unstable modes are induced by the PA technique, implying that high-order PADMs are not suitable for simulation or estimation purposes because of their weak internal structure.

ACS Style

Fernando A. Ortiz-Ricardez; Aldo Romero-Becerril; Luis Alvarez-Icaza. Hard limitations of polynomial approximations for reduced-order models of lithium-ion cells. Journal of Applied Electrochemistry 2020, 50, 343 -354.

AMA Style

Fernando A. Ortiz-Ricardez, Aldo Romero-Becerril, Luis Alvarez-Icaza. Hard limitations of polynomial approximations for reduced-order models of lithium-ion cells. Journal of Applied Electrochemistry. 2020; 50 (3):343-354.

Chicago/Turabian Style

Fernando A. Ortiz-Ricardez; Aldo Romero-Becerril; Luis Alvarez-Icaza. 2020. "Hard limitations of polynomial approximations for reduced-order models of lithium-ion cells." Journal of Applied Electrochemistry 50, no. 3: 343-354.

Articles
Published: 20 January 2020 in Electric Power Components and Systems
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The design of an Active Disturbance Rejection Controller for the Brushless DC motor (BLDC) that compensates load torque variations in the rotor shaft without the measurement of the rotor shaft speed is presented. The reconstruction of the unknown load and motor speed is accomplished by the combination of a generalized Proportional Integral Control (PI) and a Luenberger observer, while the stator current regulation is designed around a passivity based controller. Using parameters of a commercial motor designed for a small electric vehicle under different driving conditions, numerical simulation results are included that validate the effectiveness of the proposed scheme both in terms of transient response to changes in set points and in tracking variable speed references.

ACS Style

Alejandra De La Guerra; Luis Alvarez-Icaza. Robust Control of the Brushless DC Motor with Variable Torque Load for Automotive Applications. Electric Power Components and Systems 2020, 48, 117 -127.

AMA Style

Alejandra De La Guerra, Luis Alvarez-Icaza. Robust Control of the Brushless DC Motor with Variable Torque Load for Automotive Applications. Electric Power Components and Systems. 2020; 48 (1-2):117-127.

Chicago/Turabian Style

Alejandra De La Guerra; Luis Alvarez-Icaza. 2020. "Robust Control of the Brushless DC Motor with Variable Torque Load for Automotive Applications." Electric Power Components and Systems 48, no. 1-2: 117-127.

Journal article
Published: 01 January 2020 in Cogent Engineering
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ACS Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis. A structural analysis method for the promotion of Mexico City´s integral plan of mobility. Cogent Engineering 2020, 7, 1 .

AMA Style

Ioannis Chatziioannou, Luis Alvarez-Icaza, Efthimios Bakogiannis. A structural analysis method for the promotion of Mexico City´s integral plan of mobility. Cogent Engineering. 2020; 7 (1):1.

Chicago/Turabian Style

Ioannis Chatziioannou; Luis Alvarez-Icaza; Efthimios Bakogiannis. 2020. "A structural analysis method for the promotion of Mexico City´s integral plan of mobility." Cogent Engineering 7, no. 1: 1.

Research article
Published: 21 July 2019 in Advances in Civil Engineering
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The use of recursive subspace-based identification methods is analyzed in the estimation of the most significant vibration frequencies along an elevated railroad segment of México City Metro Line 12 using ambient vibration measurements recorded from 2012, when the line was opened, to 2018. Due to the railroad characteristics, the use of high-order models and the systematic tuning of the methods are required to achieve low uncertainty in frequency estimation. A frequency history is generated using these high-order models in order to check for variations along the seven years where important events took place: two low- and one high-intensity earthquakes, paving, and construction of sidewalks and planters around the sensor station. Results are consistent for all methods under analysis in the identified frequencies, suggesting that the system has preserved its structural health. To produce independent results, spectral analysis was performed showing that the associated frequency history is again consistent with that generated with recursive subspace-based identification methods. Overall, results indicate that these subspace methods are suitable for frequency monitoring in the studied system offering, in the case of recursive N4SID, important advantages in terms of low computational cost, real-time implementation, and smaller uncertainty.

ACS Style

Miguel Ángel García-Illescas; David Murià-Vila; Luis Alvarez-Icaza. Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12. Advances in Civil Engineering 2019, 2019, 1 -13.

AMA Style

Miguel Ángel García-Illescas, David Murià-Vila, Luis Alvarez-Icaza. Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12. Advances in Civil Engineering. 2019; 2019 ():1-13.

Chicago/Turabian Style

Miguel Ángel García-Illescas; David Murià-Vila; Luis Alvarez-Icaza. 2019. "Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12." Advances in Civil Engineering 2019, no. : 1-13.

Journal article
Published: 24 January 2019 in Computers & Chemical Engineering
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The problem of efficiently describing the nonlinear dynamics of spatially distributed tubular heterogeneous reactors is addressed, including multiplicity, stability, and transient behavior. An adjustable-order model is generated with a convergent partial differential equation (PDE)-to-ordinary differential equation (ODE) discretization. Efficiency means the ability to describe the PDE dynamics quantitatively, up to kinetics-transport (KT) parameter error propagation and with the smallest possible order. The problem is solved by combining notions and tools from nonlinear dynamics (bifurcation analysis and structural stability), numerical methods (error propagation and continuation), and chemical reactor engineering. Solvability requires the existence of an order below the critical one for excessive error propagation onset. The approach is applied to a 13-profile gasification reactor with experimental data, unknown multiplicity, and finite difference (FD) discretization. It is found that the reactor is robustly bistable, and can be described by a 30th-order model with considerably less equations than in previous related studies.

ACS Style

Ulises Badillo-Hernandez; Jesús Álvarez; Luis Alvarez-Icaza. Efficient modeling of the nonlinear dynamics of tubular heterogeneous reactors. Computers & Chemical Engineering 2019, 123, 389 -406.

AMA Style

Ulises Badillo-Hernandez, Jesús Álvarez, Luis Alvarez-Icaza. Efficient modeling of the nonlinear dynamics of tubular heterogeneous reactors. Computers & Chemical Engineering. 2019; 123 ():389-406.

Chicago/Turabian Style

Ulises Badillo-Hernandez; Jesús Álvarez; Luis Alvarez-Icaza. 2019. "Efficient modeling of the nonlinear dynamics of tubular heterogeneous reactors." Computers & Chemical Engineering 123, no. : 389-406.

Journal article
Published: 15 November 2018 in Engineering Structures
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A quantitative criteria to select master degrees of freedom when identifying reduced order models (ROMs) of one and three dimensional building models is proposed. The goal is achieved by performing intensive simulations of seismic responses of a large set of regular shear building models, that is constructed around a nominal model, whose inter-story mass and stiffness are randomly modified. Different levels of model reduction are selected and, for each one, an exhaustive selection of master degrees of freedom is realized. The parameters corresponding to all the ROMs are recovered by applying recursive least squares (RLS). Later, the response of the full order model (FOM) is compared with each one of the multiple ROMs response to the same seismic excitation signal, using for that purpose three error norms related with modal information: period, mode shape and participation factors and one error norm related to displacement errors. To analyze results, ROMs are classified in three groups that depend on their selection; the first group corresponds to lower-middle-upper story selection, the second group for lower-upper stories and the third group to all other possible cases. Results indicate first that the modal error norms can be used as a good predictor of the displacement error norms and second that symmetric selections of stories in the ROMs are the most accurate. These results are consistent with qualitative or “educated” choices made normally in Civil Engineering, that however, lacked a quantitative criteria similar to the one presented in this paper. Finally, a simulated example where a twelve stories model is reduced to a three stories model is presented to illustrate the results.

ACS Style

Miguel Angel García-Illescas; Luis Alvarez-Icaza. Model reduction of shear building models: A quantitative approach for master degrees of freedom selection. Engineering Structures 2018, 179, 512 -522.

AMA Style

Miguel Angel García-Illescas, Luis Alvarez-Icaza. Model reduction of shear building models: A quantitative approach for master degrees of freedom selection. Engineering Structures. 2018; 179 ():512-522.

Chicago/Turabian Style

Miguel Angel García-Illescas; Luis Alvarez-Icaza. 2018. "Model reduction of shear building models: A quantitative approach for master degrees of freedom selection." Engineering Structures 179, no. : 512-522.

Conference paper
Published: 01 September 2018 in 2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)
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An algorithm for damage detection in a multi-story building modeled by a wave equation with Kelvin damping is presented. Damage detection is achieved by relating stiffness loss with reduction in the shear wave velocity of the seismic induced motion propagation through the structure. In order to estimate wave velocity and damping parameters, an identification system based on the least squares method with forgetting factor is used. In addition, a parameterization is presented based on linear integral filters, which eliminates constant disturbances, attenuate measurement noise and depend only on acceleration signals. Once parameters information is available, a detection threshold is designed that compares them with reference values. The experimental results validate the feasibility of the proposed method.

ACS Style

Jesus Morales-Valdez; Luis Alvarez-Icaza; Jose Alberto Escobar. System identification for damage detection in buildings. 2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE) 2018, 1 -6.

AMA Style

Jesus Morales-Valdez, Luis Alvarez-Icaza, Jose Alberto Escobar. System identification for damage detection in buildings. 2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE). 2018; ():1-6.

Chicago/Turabian Style

Jesus Morales-Valdez; Luis Alvarez-Icaza; Jose Alberto Escobar. 2018. "System identification for damage detection in buildings." 2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE) , no. : 1-6.

Journal article
Published: 31 August 2018 in IFAC-PapersOnLine
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This article presents the design of an Active Disturbance Rejection Controller (ADRC) for the permanent magnet Brushless DC motor (BLDC) to compensate the load torque variations in the rotor shaft, that does not requires the measurement of the rotor shaft speed. An additional advantage of this controller is that it is easy to implement and tune. A numerical simulation is included to validate the proposed scheme using the test emission cycle US06 that represents an aggressive high speed and high acceleration driving behavior with variable load torque for a commercial motor designed for electrical vehicles.

ACS Style

Alejandra de la Guerra; Luis Alvarez–Icaza; Lizeth Torres. Brushless DC motor control with unknown and variable torque load. IFAC-PapersOnLine 2018, 51, 644 -649.

AMA Style

Alejandra de la Guerra, Luis Alvarez–Icaza, Lizeth Torres. Brushless DC motor control with unknown and variable torque load. IFAC-PapersOnLine. 2018; 51 (13):644-649.

Chicago/Turabian Style

Alejandra de la Guerra; Luis Alvarez–Icaza; Lizeth Torres. 2018. "Brushless DC motor control with unknown and variable torque load." IFAC-PapersOnLine 51, no. 13: 644-649.

Journal article
Published: 31 August 2018 in IFAC-PapersOnLine
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Motivated by the need of developing systematic safe operation as well as monitoring and control schemes, in this study the problem of on-line identifying the heat Peclet number of a bistable tubular gasification reactor is addressed. The Pe number, the ratio of dispersive-radiative to convective heat transport characteristic times, is a key parameter in the modeling of the transient and stationary complex reactor behavior. First, the nonlinear PDE model is discretized with finite differences, yielding a low-order model of global-nonlinear dynamics. Then, the combination of identification ideas from systems theory and tracer technology yields that the Pe number can be on-line identified from the kurtosis and skewness of the effluent temperature response to an induced feed temperature rectangular pulse. The proposed approach is applied to a reactor PDE model calibrated with experimental data, finding that, with respect to a previous study with response variance: (i) kurtosis halves the estimate uncertainty, and (ii) the amplitude of the temperature pulse is halved.

ACS Style

Ulises Badillo-Hernández; Luis Santamaria-Padilla; Jesús Álvarez; Luis A. Álvarez-Icaza. On-line identification of the heat Peclet number in a gasification reactor. IFAC-PapersOnLine 2018, 51, 55 -60.

AMA Style

Ulises Badillo-Hernández, Luis Santamaria-Padilla, Jesús Álvarez, Luis A. Álvarez-Icaza. On-line identification of the heat Peclet number in a gasification reactor. IFAC-PapersOnLine. 2018; 51 (13):55-60.

Chicago/Turabian Style

Ulises Badillo-Hernández; Luis Santamaria-Padilla; Jesús Álvarez; Luis A. Álvarez-Icaza. 2018. "On-line identification of the heat Peclet number in a gasification reactor." IFAC-PapersOnLine 51, no. 13: 55-60.

Research article
Published: 19 July 2018 in Shock and Vibration
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A parameter identification method and a high gain observer are proposed in order to identify the model and to recover the state of a seismically excited shear building using acceleration responses of the ground and instrumented floors levels, as well as the responses at noninstrumented floors, which are reconstructed by means of cubic spline shape functions. The identification method can be implemented online or offline and uses Linear Integral Filters, whose bandwidth must enclose the spectrum of a seismically excited building. On the other hand, the proposed state observer estimates the displacements and velocities of all the structure floors using the model estimated by the identification method. The observer allows obtaining a fast response and reducing the state estimation error, while depending on a single gain. The performance of the parameter and state estimators is verified through experiments carried out on a five-story small scale building.

ACS Style

Antonio Concha; Luis Alvarez-Icaza. Parameter and State Estimation of Shear Buildings Using Spline Interpolation and Linear Integral Filters. Shock and Vibration 2018, 2018, 1 -21.

AMA Style

Antonio Concha, Luis Alvarez-Icaza. Parameter and State Estimation of Shear Buildings Using Spline Interpolation and Linear Integral Filters. Shock and Vibration. 2018; 2018 ():1-21.

Chicago/Turabian Style

Antonio Concha; Luis Alvarez-Icaza. 2018. "Parameter and State Estimation of Shear Buildings Using Spline Interpolation and Linear Integral Filters." Shock and Vibration 2018, no. : 1-21.

Journal article
Published: 06 June 2018 in Robotica
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SUMMARYThis work proposes a strategy for position control and obstacle avoidance in a quadcopter based on constrained generalized predictive control and geometric attitude control. The approach allows real-time trajectory tracking using optimal control actions and avoids collisions with static obstacles whose position is known. An experimental validation of the proposed controller is presented.

ACS Style

Jose Luis Mendoza-Soto; Luis Alvarez-Icaza; H. Rodríguez-Cortés. Constrained generalized predictive control for obstacle avoidance in a quadcopter. Robotica 2018, 36, 1363 -1385.

AMA Style

Jose Luis Mendoza-Soto, Luis Alvarez-Icaza, H. Rodríguez-Cortés. Constrained generalized predictive control for obstacle avoidance in a quadcopter. Robotica. 2018; 36 (9):1363-1385.

Chicago/Turabian Style

Jose Luis Mendoza-Soto; Luis Alvarez-Icaza; H. Rodríguez-Cortés. 2018. "Constrained generalized predictive control for obstacle avoidance in a quadcopter." Robotica 36, no. 9: 1363-1385.

Conference paper
Published: 11 October 2017 in Volume 1: Aerospace Applications; Advances in Control Design Methods; Bio Engineering Applications; Advances in Non-Linear Control; Adaptive and Intelligent Systems Control; Advances in Wind Energy Systems; Advances in Robotics; Assistive and Rehabilitation Robotics; Biomedical and Neural Systems Modeling, Diagnostics, and Control; Bio-Mechatronics and Physical Human Robot; Advanced Driver Assistance Systems and Autonomous Vehicles; Automotive Systems
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The problem of identifying the dispersion number associated with the convective-radiative heat dispersion mechanism in an experimental gasification tubular reactor is addressed. The dependency of temperature response characteristics on the intensity and duration of a heat pulse input are characterized on the basis of a set of off-line experiments, finding that for the range of interest: (i) the coefficient of variation of the temporal temperature response depends almost linearly on the dispersion number, and (ii) the related function is robustly invertible with respect to model and experimental uncertainty. This results establishes the feasibility of identifying the key heat dispersion (inverse Peclet) number from a reasonable on-line heat pulse injection test.

ACS Style

Luis Santamaria-Padilla; Luis Alvarez-Icaza; Jesús Alvarez. Dispersion Number Identification in an Imbert Gasifier Under Parameter Uncertainty. Volume 1: Aerospace Applications; Advances in Control Design Methods; Bio Engineering Applications; Advances in Non-Linear Control; Adaptive and Intelligent Systems Control; Advances in Wind Energy Systems; Advances in Robotics; Assistive and Rehabilitation Robotics; Biomedical and Neural Systems Modeling, Diagnostics, and Control; Bio-Mechatronics and Physical Human Robot; Advanced Driver Assistance Systems and Autonomous Vehicles; Automotive Systems 2017, 1 .

AMA Style

Luis Santamaria-Padilla, Luis Alvarez-Icaza, Jesús Alvarez. Dispersion Number Identification in an Imbert Gasifier Under Parameter Uncertainty. Volume 1: Aerospace Applications; Advances in Control Design Methods; Bio Engineering Applications; Advances in Non-Linear Control; Adaptive and Intelligent Systems Control; Advances in Wind Energy Systems; Advances in Robotics; Assistive and Rehabilitation Robotics; Biomedical and Neural Systems Modeling, Diagnostics, and Control; Bio-Mechatronics and Physical Human Robot; Advanced Driver Assistance Systems and Autonomous Vehicles; Automotive Systems. 2017; ():1.

Chicago/Turabian Style

Luis Santamaria-Padilla; Luis Alvarez-Icaza; Jesús Alvarez. 2017. "Dispersion Number Identification in an Imbert Gasifier Under Parameter Uncertainty." Volume 1: Aerospace Applications; Advances in Control Design Methods; Bio Engineering Applications; Advances in Non-Linear Control; Adaptive and Intelligent Systems Control; Advances in Wind Energy Systems; Advances in Robotics; Assistive and Rehabilitation Robotics; Biomedical and Neural Systems Modeling, Diagnostics, and Control; Bio-Mechatronics and Physical Human Robot; Advanced Driver Assistance Systems and Autonomous Vehicles; Automotive Systems , no. : 1.