bluuebunny/crossref_metadata_2025 huggingface dataset:
Estimation of Concrete Mechanical Properties by Acoustic Emission with Random Forest Algorithm
Authors:   Tokyo University of Agriculture and Technology, Shimamoto Yuma ,   Niigata University, Suzuki Tetsuya ,   Ege University, Tayfur Sena ,   Ege University, Alver Ninel
Published: January 2023

The concrete structures are damaged by environmental factors and external loads. To maintain such ages structures,
it is necessary to properly determine the mechanical properties and accumulated damage level suffered by concrete
using core tests. In this study, relationship between the stress level of damaged concrete under uniaxial
compression test and acoustic emission (AE) parameters was investigated using clustering and regression analysis
with random forests to identify the most important AE parameters. For clusters 1 and 3, R2 is higher, and RMSE
and MAE are lower than for non-clustered cases. Therefore, cluster analysis can be expected to improve the
accuracy of AE testing. Thus, the most important parameter is determined to be rise time, the secondly is detected
the centroid frequency. These two parameters can be used to clarify compressive fracture behavior of damaged
concrete.
Instrumented Roadway Characterized through an Optimized Indicators Method
Authors:   Université Gustave Eiffel, Souriou David ,   Université Gustave Eiffel, Simonin Jean-Michel ,   Université de Limoges, Benaboud Soufyane ,   Université Gustave Eiffel, Blanc Juliette
Published: January 2023

In recent years, pavement instrumentation became a common practice for structural monitoring. Instrumented roadway includes different type of sensors such as strain gauges, accelerometers or geophones. Data processing consists often in extracting different values such as extremum, number of positives or negatives peaks, calculate threshold, on so on. These values are generally representative of variations in the whole structure, but make it more difficult to follow a specific characteristic of the structure.
To overcome this limitation, an original method has been defined.
It consists in finding a weighting function of the signal that is particularly sensitive to a specific characteristic of the structure without being sensitive to the other characteristics. This weighting function is calculated using a model of the structure. The sensitivity of the response of the simulated sensor to different variations in the characteristics of the structure is studied. From these sensitivities, it is possible to define specific weighting functions. The application of these weighting functions to the measured signals makes it possible to deduce indicators specific to different characteristics of the structure.

This method has been applied during an experiment on the Nantes fatigue carousel. Stain gauges equipped the roadways and lot of signals has been recorded during the loading phase. A viscoelastic pavement model has been defined and the response under a running load was calculated. Optimal weighting functions have been estimated and specific indicators constructed. Stain gauge measurements have been processed to calculate the indicator; The paper presents a comparison between constructed indicators and conventionally used indicators.
Vehicle based system for continuous non-contact surface wave testing of pavements in 50 km/h
Authors:   Lund University, Ryden Nils ,   Lund University, Starkhammar Josefin ,   Peab Asfalt AB, Gudmarsson Anders ,   Swedish Transport Administration, Bjurström Henrik ,   University West, Tofeldt Oskar
Published: January 2023

Non-destructive seismic surface wave measurements can be used for quality control of civil engineering infrastructures such as pavements and bridges. The seismic wave speed is directly linked to the dynamic E-modulus of asphalt concrete providing valuable information for quality control of both old and new structures. Non-destructive pavement testing is here demonstrated using a vehicle based system for continuous non-contact surface wave testing of pavements in about 50 km/h. A 48-channel air-coupled microphone array is mounted on the tow bar of a normal car along with a surface temperature IR sensor and GPS. Two metal heads on plastic strips are bouncing on the surface while driving producing high frequency (5-40 kHz) seismic waves in the asphalt concrete. Results demonstrate that the system can record continuous repeatable surface wave measurements with about two measurement points per meter while driving in a speed of 50 km/h. This measurement system opens up the possibility to perform faster and more economically efficient automated measurements with minimal disruption of traffic.
BIM-centred building diagnoses as a decision support tool for maintenance and repair
Authors:   RWTH Aachen University, Morgenstern Hendrik ,   RWTH Aachen University, Raupach Michael
Published: January 2023

Digitalization in the construction industry continues to advance and, together with the increasing dissemination and further development of hardware and software, is steadily opening up further opportunities for innovative ways of working. Building Information Modeling (BIM) is currently becoming the standard for new construction, but has not yet been optimized for use in existing buildings. Therefore, the Institute of Building Materials Research at RWTH Aachen University (ibac) is researching new methods and possibilities for BIM-based building preservation.

In this paper, the vision of digitalized building preservation, the state of research so far and the planned further steps are presented. It highlights what information needs to be available in the BIM model for digitalized maintenance planning, and shows how this data can be implemented in a way that is machine-readable and suitable for automated evaluation. The goal is the digital availability and linking of all inspection results, so that various operations such as lifetime prognoses or calculation of concrete removal can be performed in the BIM model. The findings to date show that making BIM models usable beyond the planning and execution phase is an essential step for the digitalization of building maintenance and holds great potential for effective building diagnoses and efficient service life management.
Possibilities of Full Waveform Inversion as an imaging method in heterogeneous solids
Authors:   Bauhaus-Universität Weimar, Reichert Ina ,   Bauhaus-Universität Weimar, Schickert Martin ,   Bauhaus-Universität Weimar, Lahmer Tom
Published: January 2023

Ultrasonic imaging of single objects in heterogeneous solids such as concrete is mainly performed using linearized methods that are limited to one wave type and neglect geometric reflections and mode conversions. This limits the reconstruction accuracy and can induce artifacts.

By considering more information of the complete resulting wavefield, full waveform inversion (FWI) promises a more accurate imaging. The method compares the measured signals with the results of the forward calculation of the scattered field of the source signals. The distribution of all three isotropic material parameters is iteratively adjusted to minimize the difference between the calculated and measured signals. By using a viable forward model, no limiting assumptions about wave propagation are necessary. Since the problem is ill-posed, regularization techniques are used for stabilization.

The paper explains the operation and possibilities of the model-based approach considering both synthetic and experimental measurement data. First results on idealized scatterer geometries in homogeneous and heterogeneous solids are presented. Beginning with synthetic measurement results for the identification of anomalies in the solid body, the method is then applied to laboratory experimental data in the ultrasonic frequency regime. In both cases the same concrete structure is adressed where a known inclusion made of extruded polystyrene foam (XPS) is representing the anomaly to be detected.
LYRA: a novel autonomous monitoring solution for bridge stays and hangers
Authors:   V2i S.A, Verstraelen Edouard ,   ULiège, Geuzaine Margaux ,   Service Public de Wallonie, Toussaint Patrice ,   Service Public de Wallonie, Auguste Thierry ,   ULiège, Denoel Vincent
Published: January 2023

The determination of the tension in cable-stayed and tied-arched bridges has been a concern for authorities for decades in order to verify the integrity of the structures. The increasing age of the bridges and the recent collapse of several of them across Europe is making their monitoring more important than ever. Nowadays, the analyses usually rely on sparse on-site measurements of the strain or of the direct force when hangers are replaced (i.e., a few times in the lifetime of the structure) or on the use of accelerometers and the simple taut string theory, which ignores the bending stiffness of the cable and its boundary conditions, to measure the tension (usually at best once a year). As a result, damages can be detected late and the measured data depends on the environmental conditions during the measurement (traffic, temperature, wind,…)

In this paper, we first describe LYRA, a novel autonomous bridge monitoring solution based on wireless accelerometers and on a robust mathematical model of the hangers. The accelerometers measure the response of the hangers to environmental solicitations six times a day and dispatch the data to a central station. Then, the station computes the tension of the cables from the time response of the sensors by means of a robust algorithm, which is an extension of the simple taut string theory for flexibles anchors and/or non-negligible bending stiffness. Finally, the measured tensions are uploaded on a webserver, where they can be monitored from any apparatus with an internet access, and alerts are automatically generated if tensions outside of pre-set boundaries are measured.

Then, we demonstrate the capabilities of the system on the Lanaye bridge, located at the border between Belgium and the Netherlands, whose 30 hangers have been monitored since July 2021.
On Detecting Internal Coating Defects in Pipes using EMAT
Authors:   King Fahd University of Petroleum & Minerals (KFUPM), Memon Azhar
Published: January 2023

Pipeline integrity is a must to maintain to ensure safe and smooth operation. Therefore, periodic inspection is required to make timely decisions for replacement or repair. One of the problems faced in a pipeline network, and targeted by this work is internal coating defect detection, whereby it is required to locate and characterize damage in the internal coating of the pipe. Current industry practice is to replace an entire set of pipelines or its large segment due to unknown defect location, implying significant wastage.

A widely used NDT technology, electromagnetic acoustic transducer (EMAT) is employed in this laboratory-based work, however, it is a challenging task to extract internal coating damage information from the received acoustic signal as it has low SNR and is highly non-linear and non-stationary, thus warranting the use of sophisticated algorithms for data analysis.

Artificial defects in the form of 100% tape-wrap coating removal are introduced with dimensions 100 x 100 mm2, 30 x 30 mm2, and 10 x 10 mm2 (square-shaped). The Carbon-Steel pipe sample has a 12” diameter and 10 mm wall thickness. The objectives are to externally inspect the pipe sample using commercially available hand-held EMAT sensors with Lamb modes, and develop and employ Singular Spectrum Analysis (SSA) algorithm to characterize the internal coating defects.

Only the largest defect is detected, whereby A1 Lamb mode shows precise location and shape, and acceptable sizing accuracy compared with A0, S0, and S1. Moreover, the results are repeatable over several scans, thus showing the effectiveness of the adopted methodology. The main novelty lies in the fact that the methodology does not require any modifications to the hardware of the EMAT setup, thus increasing the capability of the available hand-held equipment. Current and future work is focused on the detection of smaller defects.
Optimal slope angles of the air-coupled transducer from viewpoint of the effective Lamb waves propagation in different materials
Authors:   Polish Academy of Sciences (PAS), Mindykowski Damian ,   Polish Academy of Sciences (PAS), Wandowski Tomasz ,   Polish Academy of Sciences (PAS), Radzienski Maciej ,   Polish Academy of Sciences (PAS), Piotr Fiborek ,   Polish Academy of Sciences (PAS), Fiborek Piotr
Published: January 2023

Air-coupled transducers (ACT) allow for non-contact generation of acoustic waves which can be later transferred into elastic waves due to interactions with the solid specimen. Proper slope of the ACT in relation to the investigated specimen surface during acoustic waves generation is important as it leads to the possibility of generation of desired Lamb wave modes in the form of elastic waves with selected propagation velocity values. Effective generation of these modes ease the analysis of elastic waves propagation in specimens, simultaneously helping in detection of material defects if they exist. The attempt to determine optimal slope angles was undertaken in case of aluminum (Al), carbon fiber-reinforced polymer (CFRP) and glass fiber-reinforced polymer (GFRP) plate-like structure. Due to relatively low excitation frequency of the used ACT (40 kHz) the investigation was focused on the slope angles referred to the generation of zero-order modes - antisymmetric A0 and symmetric S0. In CFRP plate case the issue of efficient generation of shear horizontal (SH0) wave mode was additionally considered. In Al and CFRP plate case optimal slope angles were considered numerically (Comsol, Matlab) and experimentally (lab investigations, Matlab) while in GFRP plate case they were estimated experimentally. Although not all of the slope angles were successfully determined within different approaches, the results helped to form some interesting conclusions. After determination of the slope angles the performance of sloped/non-sloped ACT was compared in full wavefield measurements (comparison of signal energy maps calculated with the usage of root mean square (RMS) formula). Recommendations for further work were depicted within the summary section.
Multi-objective optimization to evaluate the compressive strength of concrete by combining non-destructive techniques
Authors:   University Bordeaux, Kouddane Bouchra ,   University Bordeaux, Sbartai Mehdi ,   University Bordeaux, Elachachi Sidi-Mohammed ,   Mohammed V University, Lamdouar Nouzha ,   Mohammed V University, Cherradi Toufik
Published: January 2023

The compressive strength of concrete is one of the most important mechanical parameters in the evaluation of the mechanical performance of reinforced concrete structures. The recent methodology for the evaluation of the mechanical strength of concrete of an existing structure combines non-destructive testing (NDT) measurements, such as rebound measurement and ultrasonic wave propagation velocity measurement, with destructive measurements (sampling) in order to develop a conversion model, between mechanical strength and non-destructive measurements. The conversion model is then used to estimate the local value of the resistance at each location of the non-destructive measurements and thus to represent the spatial variability.
The goal of this study is to propose a new methodology based on multi-objective optimization to predict the compressive strength of concrete and its variability based on NDT measurements. To this end, a large experimental and synthetic database of destructive and non-destructive tests was used. The conclusions drawn from the synthetic data will be compared with the results obtained on the real database in order to test the potential of the proposed methodology. This study shows the principle of the methodology and the first results of its effectiveness in predicting compressive strength and its variability.
Diagnostic Campaign Aimed at Assessing the Seismic Vulnerability of Existing Buildings Applied to Strategic Buildings in Trentino Alto Adige (Northern Italy)
Authors:   Foppoli Moretta e Associati s.r.l., Foppoli Dario ,   Foppoli Moretta e Associati s.r.l., Armanasco Alessandro ,   Agenzia del Demanio, Barone Alessandra ,   Agenzia del Demanio, Zanini Ivana
Published: January 2023

In order to assess the seismic vulnerability of existing buildings, the Italian structural codes require that the geometric characteristics of the structural elements and the mechanical characteristics of the materials shall be determined through diagnostic investigations. The level of deepening of the investigations carried out depends on the Level of Knowledge (LC) achieved; on this basis it is determined a Confiance Factor (FC) which must be applied in the subsequent verification activity to reduce the mechanical characteristics determined for the materials in the diagnostic way. Furthermore the legislation identifies the buildings that are “strategical” because of the effects consequent the seismic events: on these buildings the vulnerability assessment is mandatory.

The paper describes the diagnostic activities carried out on some buildings located in Trentino Alto Adige (Northern Italy) built between the mid-19th c. and the first decades of the 20th c., which were originally intended for the headquarters of the Judicial Prisons and the Court (in Rovereto) and for the Casa del Fascio (in Bolzano). Currently they are aimed for public offices (state offices, barracks of the financial guard and police). These are very common situations in Italy: historic buildings, built with different construction techniques (both masonry and Reinforced Concrete and mixed techniques) and subject to multiple functional transformations over time, even linked to the repair of war damage.

The analysis carried out involved the geometric and material survey, the historical analysis of the
events and interventions undergone, the mechanical characterization of the materials, foundations and foundation soil. In particular, given the architectural interest of the building and the need to minimize disturbance to users, the tests that have a limited impact on the construction (e.g. sampling on the concrete and tests with flat jacks on the masonry) were accompanied by non-destructive tests (endoscopies, sonic and ultrasonic tests, penetrometric tests on mortars, sclerometric tests and magnetometric investigations) in order to extend the results and guarantee their representativeness. It was thus possible to reach the Level of Knowledge LC3 (the maximum expected level) and apply the Confiance Factor FC = 1 (the minimum value), operating with the best compliance with the real state of the building.

It was of particular interest also the building up of a BIM (Building Information Modeling) model,
implemented from the laser scanner survey and carried up to the appropriate Level of Development (LOD = 300) which allowed to embed in the model all the acquired structural diagnostic information and to develop the consequent static and seismic assessment.
Numerical and experimental study to investigate the performance of a novel embedded SHM tool to evaluate chloride front probability of reinforced concrete structures
Authors:   CEREMA, Kadkhodazadeh Sima ,   CEREMA, Souriou David ,   Université Gustave Eiffel, Ihamouten Amine ,   Université Gustave Eiffel, Dérobert Xavier
Published: January 2023

Rebar's corrosion is a serious problematic of civil constructions that hugely reduces the serviceability of structure, mainly in maritime zone due to aggressive agents that could lead to corrosion. For decades, many Non-Destructive (ND) methods have been developed to address this issue, however, most of them focus on diagnosis the rebar’s corrosion and there is a lack of reliable techniques for prognosis.

Under framework of French ANR project LabCom OHMIGOD, we want to propose a novel Structural Health Monitoring (SHM) embedded tool for detection of chlorides penetration front in cover concrete, as preventive ND method. It calls Functional Magnetic Material (FMM) by using magnetic and ferromagnetic materials. The output signature is magnetic flux density (B), as Magnetic Observable (MO). Embedding FMM tool in concrete, exposes to chlorides penetration, it would be corroded. By evolution of corrosion, its geometrical and physical properties would be changed and it causes the MO variations. Using an external interrogator and regular monitoring, we aim to evaluate the probability of chloride ions in media, associated with MO variations caused by corrosion. To evaluate the tool’s performance, we would investigate the amount of MO variations by numerical modeling of corrosion on FMM tool and experimental test.

Firstly, through parametric study on geometrical variation and also evolution of corrosion products layer on the tool, as index of corrosion, the amount of MO variations is investigated. Secondly, through a real time monitoring test of FMM tool, placed on concrete core and corroded by accelerating corrosion for 46 hours, the MO variations are also measured. Comparing the numerical modeling and experimental results demonstrate an upward MO tendency, in line with corrosion. Moreover, a similar relative MO variation range is obtained (about 14.01\% and 12.05\%, respectively, for experimental and numerical modeling) that validates the FMM tools performance as novel SHM technique.
Transient 3D-thermal-analysis of bored piles - Comparison of two software tools and validation using a test pile
Authors:   BAUER Spezialtiefbau GmbH, Stengel Thorsten ,   BAUER Spezialtiefbau GmbH, Wackerl Martina ,   BAUER Spezialtiefbau GmbH, Beckhaus Karsten
Published: January 2023

Thermal integrity profiling (TIP) has become increasingly important as a test method for checking the integrity of bored piles in recent years. The application and the evaluation are very complex, which is why transient 3D thermal analyzes were carried out. Two software tools were compared and the results validated using real measurements on a test pile. A recommendation for the application and evaluation of thermal integrity profiling, and for the assessment of pile integrity is based on this work.

After a brief description of the bored pile production and the test methods for checking the pile integrity, 3D thermal analyzes follow on different pile variants with the help of the software tools Thermaly and MATLAB®. The temperature measurements on the test pile are then analyzed. All results are then linked, evaluated and assessed.

The evaluations show that the size and position of the thermal anomaly (here considered as “defect”) cannot be deduced from the temperature difference alone. The type of concrete and the pile diameter influence the measurement results. The limit values for the classification of the defects are to be selected taking the influencing factors into account. However, they must not be chosen too low (too sensitive), because otherwise unavoidable deviations within the measurement tolerances would be accidentally classified as defects. In addition, it must be taken into account that the arrangement of the measuring sensors and the point in time of the evaluation have a significant influence on the temperature differences at defects, or at any kind of thermal anomaly.
Platybinthus, a new genus of Lebinthina crickets (Orthoptera, Gryllidae, Eneopterinae) from Maluka, Indonesia
Authors: Robillard Tony , Tan Ming Kai
Published: January 2023

A new genus of Lebinthina (Orthoptera: Gryllidae: Eneopterinae) is erected based on species from Maluka Islands near northern Sulawesi (Indonesia): Platybinthus gen. nov. This new genus currently consists of three species. Platybinthus punctatus (Brunner von Wattenwyl, 1898) gen. et comb. nov. from Halmahera Island is assigned as the type species. Platybinthus striolatus gen. et comb. nov., also from Halmahera Island, is redescribed. We also describe a new species: Platybinthus sandyi gen. et sp. nov. from Morotai Island.
Analisis Pembelajaran Daring Terhadap Motivasi Belajar Siswa Kelas V SD Inpres Borong Jambu II Kota Makassar
Authors: Rani Patty  , Nurhadifah Amaliyah  , Cayati  , Muhammad Khaedar
Published: January 2023

This study aims to determine the analysis of online learning on students' learning motivation compared to face-to-face learning of fifth grade students at SD Inpres Borong Jambu II Makassar City. data collection instruments in the form of observation, interviews, and documentation. The research method used in this study is a descriptive qualitative research method using data collection techniques, namely interview techniques. The author uses interview techniques by collecting information from 1 principal, 1 homeroom teacher for class V, and 3 students from the class he/she teaches. Based on the joint interviews of 1 school principal, 1 homeroom teacher for class V, and 3 of these students, it was found that these students experienced a decrease in their learning motivation during online learning compared to face-to-face learning motivation. The cause of this decrease in student learning motivation is that students receive a lot of comprehensive and direct assistance from parents who accompany students when doing online learning. However, it was also found that the impact of such online assistance would have a negative impact on future student development. The negative impact on student development is that students don't care or seem to underestimate each of their assignments. In addition, students will also depend more on the help of others so that they become less independent individuals. In the end, the condition of students who are less independent will also often make it difficult for parents to direct students to complete each task and responsibility in their school.
Convex control with H∞ performance of a hexarotor-UAV
Authors:   Instituto Tecnológico de Tuxtla Gutiérrez, Ancheyta-López H. , Gomez-Peñate S. ,   Instituto Tecnológico de Tuxtla Gutiérrez, Gasga P. ,   Instituto Tecnológico de Tuxtla Gutiérrez, López-Estrada F. R. ,   Instituto Tecnológico de Tuxtla Gutiérrez
Published: January 2023

This paper is dedicated to the modeling and control for a hexarotor-type unmanned aerial vehicle based in a convex rewrite that it is represents exactly the nonlinear model of the hexarotor. Then, the controller design is considered a parallel-distributed compensation control law to stabilitze of the vehicle and a H∞ performance criterion to aguratee robustness againts distrubances. The stability condition and robust performance are formulated using the function quadratic of Lyapunov where the sufficient conditions are given by a set of linear matrix inequalities. Finally, it is illustrated the numerical simulations of the proposed method through of the hexarotor.
Modeling of Multi Terminal VSC-HVDC links using port-Hamiltonian Systems
Authors:   Universidad Nacional Autónoma de México, Trejo-Guerra Montserrat , Avila-Becerril Sofía ,   Universidad Nacional Autónoma de México, Maya-Ortiz Paul ,   Universidad Nacional Autónoma de México
Published: January 2023

In recent years, different strategies have been used to model HVDC systems. A usual strategy is to look for the models simplification (or linearization) to do a small-signal analysis. However, VSC-HVDC multiterminal links have intrinsically non-linear characteristics that need to be considered. Port-Hamiltonian (pH) systems provide a modeling methodology that allows incorporating the elements of the HVDC system in a modular way while explicitly providing the energy function, internal interconnection, and dissipation, which is helpful for analysis and control. This paper presents the modeling of a multiterminal HVDC network commonly used in the Electrical Power Systems literature from the pH perspective. It aims to use the pH structure to incorporate elements into the system while preserving its properties. Numerical simulations are carried out to show a comparison between the common model and the pH representation and it is shown that the latter reproduces the same dynamics of the former without loss of information but gaining in simplicity and structure.
Modeling of an Interleaved Quadratic Buck Converter
Authors:   Universidad Autónoma de San Luis Potosí, Reyes-Portillo I. A. , Méndez-Elizondo S. R. ,   Universidad Autónoma de San Luis Potosí, Morales-Saldaña J. A. ,   Universidad Autónoma de San Luis Potosí, Palacios-Hernández E. R. ,   Universidad Autónoma de San Luis Potosí, Rivera-Romero C. A. ,   Universidad Autónoma de Zacatecas
Published: January 2023

This paper presents the modeling of a Quadratic Buck Converter with interleaved function, operating in continuous conduction mode. The structure of the proposed converter presents better functional aspects with respect to other Quadratic Buck converters reported in the literature. This work establishes the general structure of the proposed converter, as well as its operation. In addition, the switching model and the average model are developed in order to obtain the dynamic characteristics of the system, which are used for the design of the controllers.
H∞ adaptive observer for nonlinear systems with disturbed output
Authors:   Centro Nacional de Investigación y Desarrollo Tecnológico, Alvarado-Mendez P. E. , Astorga-Zaragoza C. M. ,   Centro Nacional de Investigación y Desarrollo Tecnológico, Ramirez-Rasgado F. ,   Centro Nacional de Investigación y Desarrollo Tecnológico, Osorio-Gordillo G. L. ,   Centro Nacional de Investigación y Desarrollo Tecnológico, Hernandez-Gonzalez O. ,   Instituto Tecnológico de Hermosillo
Published: January 2023

This paper presents the design of an adaptive robust observer for a class of nonlinear system considering that the output is affected by a perturbation. The observer is able to estimate the state vector and the value of an unknown parameter present in a system. This allows to reduce the effect of the perturbation in the system output. A Lyapunov-like analysis was performed to guarantee the stability of the observer. The gains are computed by means of LMI and satisfying the performance of the H∞ criterion. The proposed observer is evaluated by estimating the state vector and an unknown parameter of an academic example, reducing considerably the presence of disturbances at the output.
Necessary and sufficient stability conditions for time-delay systems: a comparison
Authors:   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Castaño Alejandro , Santos-Estudillo Oscar ,   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Portilla Gerson ,   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mondié Sabine ,   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
Published: January 2023

We compare three existing criteria which provide necessary and sufficient stability conditions for linear time-delay systems. An outstanding property of these conditions, based on the delay Lyapunov matrix, is that the decision is made via a finite number of operations. The main ideas of each method are briefly introduced and tested on two illustrative examples. A discussion of the result is presented.
Robust Output Regulation for a Constrained Omnidirectional Mobile Robot
Authors:   Tecnológico Nacional de México/I.T. La Laguna, Gutiérrez Ariana , Mera Manuel ,   Instituto Politécnico Nacional, Ríos Héctor ,   Cátedras CONACYT
Published: January 2023

This paper aims to design a robust output control to regulate the output for an uncertain omnidirectional mobile robot with input saturation and state constraints, in the presence of external disturbances. The proposed robust control approach is composed of a linear control part, that is designed based on the attractive ellipsoid method and a barrier Lyapunov function approach, taking into account the input and state constraints, and a nonlinear control part that can compensate the effect of matched disturbances. The synthesis of the robust control is given in terms of linear matrix inequalities. Simulation results show the workability of the proposed robust control approach.
Evaluación de un controlador adaptable por modelo de referencia mediante servomotores de CD de bajo costo
Authors:   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Morales Olga J. , Garrido Rubén ,   Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Maldonado J. ,   Instituto Politécnico Nacional
Published: January 2023

En este trabajo se presenta la evaluación de una ley de Control Adaptable Directo por Modelo de Referencia mediante tres servomotores de CD de bajo costo, los cuales pueden servir como actuadores en plataformas de enseñanza. Uno de los servomotores corresponde a la marca LEGO, modelo NXT, un segundo servomotor es de la marca MakeBlock y un tercero corresponde a un Servomotor Analógico de Radio Control (SARC) genérico. Se describen sus características técnicas, así como también su desempeño experimental cuando se implementa una ley de control en posición basada en un controlador Adaptable Directo por Modelo de Referencia. Los resultados obtenidos muestran que es posible utilizar algoritmos de control avanzados empleando servomotores de CD de bajo costo obteniéndose un desempeño adecuado.
Super-twisting control design of speed regulation and tracking for a surface-mounted PMSM
Authors:   Instituto Tecnológico de Tijuana, Aldrete-Maldonado Christian , Hernández Pastrana Juan Jesús ,   Instituto Tecnológico de Tijuana, Coria Luis N. ,   Instituto Tecnológico de Tijuana, Ramírez-Villalobos Ramón ,   Instituto Tecnológico de Tijuana
Published: January 2023

This work is devoted to presenting a second-order sliding mode control for speed regulation and tracking for a surface-mounted permanent magnet synchronous motor. We tune the conventional PI controllers using the field-oriented control scheme. On the other hand, we design a generalized super-twisting sliding mode control, improving the performance characteristics when the machine is under the effects of external torque. Finally, a high-precision emulator is used to validate the theoretical results.
Passivity-Based Control of Angular Velocity of PMSM with Position and Stator Currents Measurement
Authors:   Universidad Autónoma de la Ciudad México, Guerrero Cuauhtémoc , Santibañez Víctor ,   Instituto Tecnológico de La Laguna, Villalobos-Chin Jorge ,   Instituto Tecnológico de La Laguna
Published: January 2023

A novel control strategy for the angular velocity of the permanent magnet synchronous motor (PMSM) is presented. The control law is designed using current and position measurements only. The desired velocity signal is obtained through a linear second-order filter. Additionally, a formal stability analysis of the closed-loop system comprised of the motor dynamics and the second-order filter is also presented.
Stabilization of a Furuta’s Pendulum using Barrier Function-based Adaptive Lyapunov Re-design
Authors:   Universidad Nacional Autónoma de México, González-Rodríguez A. , Antonio Ortega J. ,   Universidad Nacional Autónoma de México, Estrada Manuel A. ,   Universidad Nacional Autónoma de México, Moreno Jaime A. ,   Universidad Nacional Autónoma de México, Fridman Leonid ,   Universidad Nacional Autónoma de México
Published: January 2023

One of the most challenging task in the control engineering is the stabilization of underactuated systems. This task can be even arduous if the system is affected by parametric uncertainties due to a partial knowledge of the parameters or external disturbances. These difficulties could lead to instability. The paper presents an adaptive approach to the Lyapunov redesign, stabilizing a Furuta’s pendulum, where the control signal follows the uncertainties with opposite sign. The controller is composed of a nominal term and a barrier function based adaptive sliding mode control. The gain guarantees the system trajectories converge to a vicinity of the surface in finite-time. Then, a barrier-function gain maintains the sliding surface inside a predefined vicinity. In this matter, the proposed controller guarantees the estimation of the uncertanties generating a continuous control signal from the semi-positive definite barrier function. Finally, some experiments were performed to prove the feasibility of the proposed controller.
Sensor fault detection in a biohydrogen production process based on an interval observer and adaptive thresholds
Authors:   Universidad de Guanajuato, Torres Ixbalank , Avilés Jesús David ,   Universidad Autónoma de Baja California, Vargas Alejandro ,   Laboratorio de Investigación en Procesos Avanzados de Tratamiento de Aguas, Instituto de Ingeniería – UNAM
Published: January 2023

In this paper, an interval observer-based fault detection strategy is proposed to deal with faults in the hydrogen flow rate sensor of a biohydrogen production process. A control Hinf-based robust interval observer is designed to (i) estimate the glucose and biomass concentrations from measurements of the hydrogen flow rate produced, (ii) attenuate the effect of the unknown inlet glucose concentration, and (iii) detect faults in the hydrogen flow rate sensor through adaptive thresholds. The gain is designed by solving a semi-definite optimization problem subject to LMIs. The feasibility of the proposed strategy is demonstrated by simulations.
A Novel Finite-Time Controller for the Tracking Problem on the Heisenberg System
Authors:   Instituto Politécnico Nacional, Mera Manuel , Ríos Héctor ,   Tecnológico Nacional de México/I.T. La Laguna, Polyakovz Andrey ,   Université de Lille
Published: January 2023

In this paper, a novel second-order sliding-mode controller for the tracking problem on the Heisenberg system is proposed. The controller design takes into account a nonlinear change of coordinates and the selection of some particular sliding variables. These, ensure the tracking error convergence to zero in a finite time. One important characteristic of this design is the simplicity of the controller structure and the ease of tunning the gains and parameters. Additionally, the implementability of the approach is illustrated through some simulation results.
Control for plasma glucose regulation in type 1 diabetes mellitus patients with unknown input delays
Authors:   Instituto Tecnológico de Hermosillo, Castro-Gómez J. , Valencia-Palomo G. ,   Instituto Tecnológico de Hermosillo, Hernández-González O. ,   CONACYT-Instituto Tecnológico de Hermosillo, Guerrero-Sánchez M. E. ,   CONACYT-Instituto Tecnológico de Hermosillo, Ramírez-Rasgado F. ,   Centro Nacional de Investigación y Desarrollo Tecnológico, Astorga-Zaragoza C. M. ,   Centro Nacional de Investigación y Desarrollo Tecnológico
Published: January 2023

This paper presents a control strategy for plasma glucose regulation in the presence of input with unknown time delay (constant or variable) and meal disturbances in the system. The control scheme proposed is an observer-based state feedback controller. The observer achieves to estimate the state vector even if the control input in the system presents an unknown time delay in the input. The main advantage of the controller is that the gains are selected so the control law will provide positive values that ensure an implementable case. The observer-based control scheme is validated considering different disturbance and unknown delays scenarios, in both cases, glucose regulation is achieved, rejecting meal disturbances in 4 hours and avoiding hypoglycemic episodes.
Stability in the Synchronization of Multi-scroll Chaotic Systems using Hamiltonian Forms
Authors:   Centro Universitario de los Lagos Universidad de Guadalajara, Vázquez Gutiérrez Juan Luis , López-Mancilla Didier ,   Centro Universitario de los Lagos Universidad de Guadalajara
Published: January 2023

This work contributes to the subject of stability in the synchronization of identical chaotic systems, coupled by means of a control law. Initially, chaotic systems with multiple scrolls are expressed in a Hamiltonian form, this allows us to observe particular characteristics of the system, since the system is divided into a conservative part and a dissipative part. This procedure helps in the design of a control law that allows identical chaotic systems to be synchronized. In particular, the technique of Model-Matching is used for the design of the control law, but an optimization is performed in the design of a control law, based only on the conservative part of the chaotic systems in Hamiltonian form. This gives us a new point of view in the design of the controllers used to achieve synchronization between chaotic systems, which simplifies the calculations that are carried out to obtain a law of control. A stability analysis is performed in this work to ensure that the synchronization of the two systems coupled by the effect of the control law meet the full system synchronization requirements, some numerical simulations are presented.
Synchronization of memristor based bidirectionally coupled Hindmarsh-Rose neurons
Authors:   Instituto Potosino de Investigación Científica y Tecnológica, Carro-Pérez lliani , Barajas-Ramírez Juan Gonzalo ,   Instituto Potosino de Investigación Científica y Tecnológica
Published: January 2023

An ideal memristor is a device whose resistive memory value is determine by its initial conditions and the voltage that has been applied across its terminals. As such, it is a good candidate to model the synaptic plasticity of neural systems. When memristors are included in neural models, they are called memristive neural networks. In this contribution, we investigate the emergence of synchronization in an array of two identical Hindmarsh-Rose neurons bidirectionally coupled through their voltage variables via memristors. We show that, for a sufficiently large positive memductance, synchronization emerges between neurons while the memristors converge to constant synaptic weight values. We illustrate our results with numerical simulations.
Voces gallegas (o no) en protocolos notariales del siglo XVIII: distrito de Carballo.
Authors: Campos Souto Mar
Published: January 2023

En este artículo se presenta una pequeña muestra de algunosvocablos gallegos documentados en protocolos notariales delsiglo XVIII del distrito de Carballo; en concreto, el examen de unnotable número de inventarios post-mortem de campesinos permitecomprobar el modo en que se incorporan a los textos diferentes vocescuya presencia obedece tanto a los fenómenos de intercambioentre las dos lenguas que coexisten en el territorio (gallego y español),como a las características propias del vocabulario del españolde Galicia o a la continuidad léxica del español occidental.
Migración de la variedad léxica peninsular y su generalización americana en documentos coloniales.
Authors: Franco Figueroa Mariano
Published: January 2023

Basado en documentos seleccionados del Archivo Generalde Indias, el trabajo muestra la peculiaridad léxica americana motivadapor el proceso de mestizaje lingüístico del componente patrimonial.El caudal léxico producido en América revela el espíritucreador de la lengua y constituye un núcleo fundamental para latarea de un diccionario histórico. Se trata de una pequeña aportacióna la labor lexicográfica histórica basada en la cita documental,que va más allá del mero registro y que permite deducir una definicióncontextual, con acotación cronológica y social fiable, de muchasvoces tildadas como americanismos. El vocabulario de nuestra lenguase abastece de todas las palabras, en su sentido más amplio, detodos los territorios, grupos sociales y épocas históricas, y, en nuestrocaso, de las variantes semánticas, morfológicas y léxicas quecomponen la idiosincrasia lingüística del Nuevo Mundo, como parteineludible del legado léxico del español.
Relaciones de bienes y geografía lingüística del siglo XVII.
Authors: Morala José Ramón
Published: January 2023

El trabajo parte de un corpus de documentos inéditoscompuesto por relaciones de bienes del siglo XVII. A partir de estecorpus se estudia el léxico de la vida cotidiana y se analiza la utilidadque tiene para el estudio del léxico histórico desde una perspectivadiatópica. El corpus sirve tanto para detectar el área de uso deformas innovadoras (bombasí, biombo, cuja, limiste, pegoste) comopara dibujar el área en el que perviven voces en retroceso (cócedra,hirma, arrelde, quilma). Del mismo modo, la comparación entre fondosde diversos archivos permite establecer el área de expansión devoces patrimoniales en el Siglo de Oro: masera, zaranda, brega, cerristopa,camizo, vánova, lichera, cociol y bieldo.
De cómo Semuel acabó senil. Errores de copia en la documentación medieval de Miranda de Ebro
Authors: Grande López Clara
Published: January 2023

Presentamos en este trabajo los resultados de la comparaciónde tres documentos medievales conservados en el archivo municipal deMiranda de Ebro (Burgos). Se trata de tres documentos que fueron copiadosde manera sucesiva a lo largo del siglo XIV: esto es, el segundodocumento es copia del primero; y el tercero es un traslado del segundo.De esta forma, hemos ido observando los cambios que sufrió el texto ycómo se generaron gran cantidad de errores de copia, algunos de ellosque influyen sobremanera en la comprensión del documento.
Notas para la organización textual de los Ordenamientos Jurídicos Vizcaínos. Sobre copias y traslados
Authors: Líbano Zumalacárregui Ángeles
Published: January 2023

En esta colaboración, y con el objetivo de realizar una edicióncrítica de los Ordenamienos Jurídicos Vizcaínos, reconstruiremos unosdatos esenciales e imprescindibles sobre sus fundamentos básicos, tomandocomo guía lo que relata el manuscrito más antiguo, depositado enel Archivo Foral del Señorío de Vizcaya.Así, puesto que colaboramos con un grupo de investigación de medievalistasinteresados por conocer el contenido real de estas leyes y el modode transmitirlo por escrito, me propongo exponer aquí las observacionesiniciales y primeros pasos sobre este corpus jurídico, para tratar de establecerel texto definitivo y la relación entre sus copias y traslados. Podemosadelantar que hemos conseguido localizar un número de copias –desafortunadamenteen exceso tardías– desconocidas hasta el momento, peroque resultarán imprescindibles para organizar la tradición manuscrita delFuero de Vizcaya.
La Formación de Palabras en alza
Authors: Pujol Payet Isabel
Published: January 2023

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Tipología textual y análisis léxico en documentación malagueña del siglo XVII
Authors: Carrasco Cantos Pilar , Esteba Ramos Diana
Published: January 2023

En el presente trabajo se realiza un estudio léxico de un conjuntode documentos del siglo XVII que se encuentran en el ArchivoCatedralicio de Málaga. Estos documentos, llamados probanzas, son ungénero textual que tiene que ver con el estatuto de «limpieza de sangre»practicado en diferentes catedrales españolas. El análisis aportado se basaen la tipología textual como elemento capaz de determinar usos léxicos,siguiendo de cerca planteamientos teóricos aplicados como los deWesch.