Buscar en RiuNet

Listar

Todo RiuNet

Mi cuenta

Acceder

Ayuda RiuNet

Admin. UPV

Listar por palabra clave "Time-frequency analysis"

Mostrando ítems 1-17 de 17

A comparison of techniques for fault detection in inverter-fed induction motors in transient regime

Fernandez-Cavero, Vanessa; Morinigo-Sotelo, Daniel; Duque-Perez, Oscar; Pons Llinares, Joan (Institute of Electrical and Electronics Engineers, 2017)

[EN] Fault detection in induction motors operating in non-stationary regimes has become a need in today's industry. Most of the works published deal with line-fed motors. Nevertheless, the number of inverterfed induction ...
Automatic diagnosis of electromechanical faults in induction motors based on the transient analysis of the stray flux via MUSIC methods

Zamudio-Ramírez, Israel; Ramirez-Núñez, Juan Angel; Antonino Daviu, José Alfonso; Osornio-Rios, Roque A.; Quijano-Lopez, Alfredo; Razik, Hubert; Romero-Troncoso, Rene de Jesus (Institute of Electrical and Electronics Engineers, 2020-08)

[EN] In the induction motor predictive maintenance area, there is a continuous search for new techniques and methods that can provide additional information for a more reliable determination of the motor condition. In this ...
Classification of persistent and long-standing persistent atrial fibrillation by means of surface electrocardiograms

Ortigosa, Nuria; Fernández, Carmen; Galbis, Antonio; Cano, Oscar (De Gruyter, 2016-02)

Atrial fibrillation, which is the most common cardiac arrhythmia, is typically classified into four clinical subtypes: paroxysmal, persistent, long-standing persistent and permanent. The ability to distinguish between them ...
DC Current Harmonics Reduction in Multi-Inverter Topology

Reyes, Eduardo; Sarasiri, Nuapett; Pena, Ruben; Riedemann, Javier; Andrade, Iván; Blasco-Giménez, Ramón; Jara, Werner (Institute of Electrical and Electronics Engineers, 2022-10)

[EN] This letter presents a Space Vector Pulse Width Modulation (SVPWM) strategy for reducing the DC-link current harmonics in a multi- Voltage Source Inverter (VSI) topology with common DC-link bus. The DC current harmonic ...
Desarrollo de una aplicación para la detección y codificación MIDI de melodías por medio de análisis tiempo-frecuencia

Rodríguez Martínez, Leonardo (Universitat Politècnica de València, 2020-09-15)

[ES] El desarrollo de herramientas para la industria de la música tiene cada vez mayor crecimiento, tanto a nivel de hardware como de software. Así pues, el procesado de efectos de audio por ordenador y la evolución del ...
Detection and quantification of bar breakage harmonics evolutions in inverter-fed motors through the dragon transform

Fernández-Cavero, V.; Pons Llinares, Joan; Duque-Perez, Oscar; Morinigo-Sotelo, D. (Elsevier, 2021-03)

[EN] The problem of detecting and quantifying bar breakage harmonics in inverter-fed induction motors has not been solved by the time-frequency transforms present in the technical literature. The paper proposes a new ...
Diagnosis of Induction Motor Faults in the Fractional Fourier Domain

Pineda-Sanchez, Manuel; Riera-Guasp, Martín; Antonino-Daviu, J.; Roger-Folch, José; Perez-Cruz, Juan; Puche-Panadero, Rubén (Institute of Electrical and Electronics Engineers, 2010)

[EN] Motor current signature analysis (MCSA) is a well-established method for the diagnosis of induction motor faults. It is based on the analysis of the spectral content of a motor current, which is sampled while a motor ...
Extracting dolphin whistles in complex acoustic scenarios: a case study in the Bay of Biscay

Miralles Ricós, Ramón; Gallardo-Llopis, Carles; Lara Martínez, Guillermo-Fernan; Bou Cabo, Manuel (Taylor & Francis, 2024-05-03)

[EN] Accurate whistle contour extraction is crucial in many dolphin behavioural studies. Traditionally, whistle contour extraction involves a first step of finding whistle candidates by peak-level detection in the ...
Instantaneous Frequency of the Left Sideband Harmonic During the Start-Up Transient: A New Method for Diagnosis of Broken Bars

Pineda-Sanchez, Manuel; Riera-Guasp, Martín; Antonino-Daviu, J.; Roger-Folch, José; Perez-Cruz, Juan; Puche-Panadero, Rubén (Institute of Electrical and Electronics Engineers, 2009)

[EN] In this paper, a new method for detecting the presence of broken rotor bars is presented. The proposed approach is valid for induction machines started at constant frequency and consists of extracting the instantaneous ...
Mixed eccentricity diagnosis in Inverter-Fed Induction Motors via the Adaptive Slope Transform of transient stator currents

Pons Llinares, Joan; Antonino-Daviu, J.; Roger-Folch, José; Moriñigo Sotelo, Daniel; Duque Pérez, Oscar (Elsevier, 2014)

[EN] This paper researches the detection of mixed eccentricity in Inverter-Fed Induction Motors. The classic FFT method cannot be applied when the stator current captured is not in steady state, which is very common in ...
Nuclearity of rapidly decreasing ultradifferentiable functions and time-frequency analysis

Boiti, Chiara; Jornet Casanova, David; Oliaro, Alessandro; Schindl, Gerhard (Springer-Verlag, 2021-05)

[EN] We use techniques from time-frequency analysis to show that the space S(omega )of rapidly decreasing omega-ultradifferentiable functions is nuclear for every weight function omega(t) = o(t) as t tends to infinity. ...
Operation of the Discrete Wavelet Transform: basic overview with examples

Antonino Daviu, José Alfonso (Universitat Politècnica de València, 2013-07-08)

This learning object describes the operation of the Discrete Wavelet Transform under an engineering perspective, without deepening in complex mathematical details. It includes several didactic examples that illustrate the ...
Operation of the Hilbert-Huang Transform: basic overview with examples

Antonino Daviu, José Alfonso (Universitat Politècnica de València, 2013-07-08)

This learning object provides a simple explanation of the operation of the Hilbert-Huang transform. This is a tool which has been employed with success in the signal processing field and, more especifically, in the analysis ...
Pursuing optimal electric machines transient diagnosis: The adaptive slope transform

Pons Llinares, Joan; Riera-Guasp, Martín; Antonino-Daviu, José Alfonso; Habetler, TG (Elsevier, 2016)

[EN] The aim of this paper is to introduce a new linear time-frequency transform to improve the detection of fault components in electric machines transient currents. Linear transforms are analysed from the perspective of ...
Robust acoustic source localization based on modal beamforming and time-frequency processing using circular microphone arrays

Torres Aranda, Ana María; Cobos Serrano, Máximo; Pueo Ortega, Basilio; López Monfort, José Javier (Acoustical Society of America, 2012-09)

Uniform circular array processing has been shown to be a very useful tool for broadband acoustic source localization over 360 degrees. Specifically, beamforming methods based on circular harmonics have attracted a lot of ...
The Pulsed To Tonal Strength Parameter And Its Importance In Characterizing And Classifying Beluga Whale Sounds

Miralles Ricós, Ramón; Lara Martínez, Guillermo-Fernán; Esteban, Jose Antonio; Rodriguez, Alberto (Acoustical Society of America, 2012-03)

A large number of the vocalization studies on mammals are based on time-frequency analysis of the produced sounds. The patterns, which are extracted from the time-frequency representations, determine the classification in ...
The use of a Multi-label Classification Framework for the Detection of Broken Bars and Mixed Eccentricity Faults based on the Start-up Transient

Georgoulas, George; Climente Alarcón, Vicente; Antonino-Daviu, J.; Tsoumas, Ioannis P.; Stylios, Chrysostomos D.; Arkkio, Antero; Nikolakopoulos, George (Institute of Electrical and Electronics Engineers, 2016)

[EN] In this article a data driven approach for the classification of simultaneously occurring faults in an induction motor is presented. The problem is treated as a multi-label classification problem with each label ...