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Papers by Fulgencio Marín
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Renewable Energy and Power Quality Journal
Measurement Science and Technology, 2016
One of the widely used processes to measure torsional vibration focuses on the analysis of a squa... more One of the widely used processes to measure torsional vibration focuses on the analysis of a square signal from a device set in the machine shaft. The tools used for this purpose usually consist of a toothed wheel connected to an appropriate transducer, of an electromagnetic or optic type, which provides a square wave signal. If the rotation velocity is constant, the signal pulses are the same width, but when the velocity changes, the width of the pulses changes too, lengthening or shortening its width, resulting in a frequency modulated signal. When the shafts of the machines are misaligned angularly, the average speed changes due to variable torque action, so that spectral features of modulated signal show frequency components that are explained by the Bessel Functions. This work shows that these components are caused by a carrying (constant average speed) and a modulator signal (variable turning speed) between the harmonics surrounding the central frequency. Besides, it may also test their relationship with the presence of angular misalignment in the coupled-machine shafts. In addition, an iterative method is applied to construct the frequency spectral diagram of the induced square signal, once the appropriate modulation indices of the Bessel functions have been calculated. To compare and validate the method, different bench tests have been performed using pulse signal and laser interferometry.
Se presenta el análisis de un nuevo algoritmo utilizado como observador de estado para lograr la ... more Se presenta el análisis de un nuevo algoritmo utilizado como observador de estado para lograr la correcta sincronización en fase y frecuencia de un inversor trifásico conectado a la red eléctrica de baja tensión, llevando a cabo la regulación desacoplada de las potencias instantáneas activa y reactiva por medio de la transformación de Park (dominio transformado). Se analiza la respuesta del algoritmo observador a los armónicos de la red, tanto en el dominio del tiempo como en el dominio transformado, y se muestra su utilización en el control vectorial en fuente de corriente por histéresis de un inversor trifásico conectado a la red que garantiza una conexión con factor de potencia unitario si así se desea. Se muestran varias simulaciones del funcionamiento, tanto del observador de estado propuesto, así como del control del inversor. Keywords-Transformación de Park, observador de estado, control vectorial I. INTRODUCTION Los sistemas de microgeneración, tales como las fotovoltaicas y...
IEEE Workshop Power Electronics Education, 2005., 2005
IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243), 2001
Lecture Notes in Computer Science, 2007
Encyclopedia of Artificial Intelligence, 2009
International Journal of Engineering Science, 2012
ABSTRACT The stick-slip model is composed of non-linear and coupled differential equations that r... more ABSTRACT The stick-slip model is composed of non-linear and coupled differential equations that reproduce the friction occurring in mechanical systems in which two bodies slide against each other. The problem is very interesting since the possible solutions, which are very sensitive to the parameters of the system, range from simple stable harmonic solutions to chaotic. In this contribution, the model for the 1 and 2 degrees of freedom problems, which is designed following network method rules, is explained in detail and run on standard electrical circuit simulation software to provide the displacement and the velocity of the sliding bodies and the phase planes. The influence of the main parameters of the system on the type of pattern of the solution is studied for a practical range of these parameters. Nondimensional analysis is applied to obtain the most universal solutions.
Computer Physics Communications, 2011
An adequate methodology to teach integrated simulation of power electronic systems is presented i... more An adequate methodology to teach integrated simulation of power electronic systems is presented in this paper for undergraduate and postgraduate students, taking into account the advantages of SIMULINK blocksets for modelling, together with C algorithms for controlling, and MATLAB toolboxes for analysis and visualization. The power electronics devices and systems are modelled by using several blocks of the SimPowerSystems library
Computational and …, 2007
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Renewable Energy and Power Quality Journal
Measurement Science and Technology, 2016
One of the widely used processes to measure torsional vibration focuses on the analysis of a squa... more One of the widely used processes to measure torsional vibration focuses on the analysis of a square signal from a device set in the machine shaft. The tools used for this purpose usually consist of a toothed wheel connected to an appropriate transducer, of an electromagnetic or optic type, which provides a square wave signal. If the rotation velocity is constant, the signal pulses are the same width, but when the velocity changes, the width of the pulses changes too, lengthening or shortening its width, resulting in a frequency modulated signal. When the shafts of the machines are misaligned angularly, the average speed changes due to variable torque action, so that spectral features of modulated signal show frequency components that are explained by the Bessel Functions. This work shows that these components are caused by a carrying (constant average speed) and a modulator signal (variable turning speed) between the harmonics surrounding the central frequency. Besides, it may also test their relationship with the presence of angular misalignment in the coupled-machine shafts. In addition, an iterative method is applied to construct the frequency spectral diagram of the induced square signal, once the appropriate modulation indices of the Bessel functions have been calculated. To compare and validate the method, different bench tests have been performed using pulse signal and laser interferometry.
Se presenta el análisis de un nuevo algoritmo utilizado como observador de estado para lograr la ... more Se presenta el análisis de un nuevo algoritmo utilizado como observador de estado para lograr la correcta sincronización en fase y frecuencia de un inversor trifásico conectado a la red eléctrica de baja tensión, llevando a cabo la regulación desacoplada de las potencias instantáneas activa y reactiva por medio de la transformación de Park (dominio transformado). Se analiza la respuesta del algoritmo observador a los armónicos de la red, tanto en el dominio del tiempo como en el dominio transformado, y se muestra su utilización en el control vectorial en fuente de corriente por histéresis de un inversor trifásico conectado a la red que garantiza una conexión con factor de potencia unitario si así se desea. Se muestran varias simulaciones del funcionamiento, tanto del observador de estado propuesto, así como del control del inversor. Keywords-Transformación de Park, observador de estado, control vectorial I. INTRODUCTION Los sistemas de microgeneración, tales como las fotovoltaicas y...
IEEE Workshop Power Electronics Education, 2005., 2005
IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243), 2001
Lecture Notes in Computer Science, 2007
Encyclopedia of Artificial Intelligence, 2009
International Journal of Engineering Science, 2012
ABSTRACT The stick-slip model is composed of non-linear and coupled differential equations that r... more ABSTRACT The stick-slip model is composed of non-linear and coupled differential equations that reproduce the friction occurring in mechanical systems in which two bodies slide against each other. The problem is very interesting since the possible solutions, which are very sensitive to the parameters of the system, range from simple stable harmonic solutions to chaotic. In this contribution, the model for the 1 and 2 degrees of freedom problems, which is designed following network method rules, is explained in detail and run on standard electrical circuit simulation software to provide the displacement and the velocity of the sliding bodies and the phase planes. The influence of the main parameters of the system on the type of pattern of the solution is studied for a practical range of these parameters. Nondimensional analysis is applied to obtain the most universal solutions.
Computer Physics Communications, 2011
An adequate methodology to teach integrated simulation of power electronic systems is presented i... more An adequate methodology to teach integrated simulation of power electronic systems is presented in this paper for undergraduate and postgraduate students, taking into account the advantages of SIMULINK blocksets for modelling, together with C algorithms for controlling, and MATLAB toolboxes for analysis and visualization. The power electronics devices and systems are modelled by using several blocks of the SimPowerSystems library
Computational and …, 2007