Now showing items 1-20 of 71

  • Adaptive autofocus technique for speckle control in optical feedback interferometry 

    Atashkhooei, Reza; Royo Royo, Santiago; Azcona Guerrero, Francisco Javier (2014-09-01)
    Article
    Restricted access - publisher's policy
    An adaptive autofocus technique for the control of speckle effect in optical feedback interferometry (OFI) is discussed. The beam spot size effect over the OFI signal is presented, justifying the proposed approach. An ...
  • Adaptive predictive control of a base-isolated hysteretic system 

    Ponce de León Puig, Nubia Ilia; Acho Zuppa, Leonardo; Rodellar Benedé, José (2017)
    Conference report
    Restricted access - publisher's policy
    This article proposes an adaptive predictive control design technique to mitigate the displacement in a hysteretical base-isolated system seismically perturbed. The obtained predictive control law is based on the ...
  • Advanced condition monitoring of Pelton turbines 

    Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Bossio, Matias (2018-04)
    Article
    Open Access
    The ability of hydropower to adapt the electricity generation to the demand is necessary to integrate wind and solar energy into the electrical grid. Nowadays, hydropower turbines are required to work under harsher operating ...
  • Anàlisi de vibracions en bancades per a proves de motors 

    Aubà Gomis, Elm (Universitat Politècnica de Catalunya, 2015)
    Bachelor thesis
    Open Access
    Trobar un mètode senzill i compatible amb les eines de les que disposa l’empresa, per analitzar els efectes de les vibracions causades pels motors alternatius de combustió interna en els bancs de proves. I així poder-ne ...
  • Analysis of roughness and vibration signals in milling processes 

    Guijarro Pérez, Rut (Universitat Politècnica de Catalunya, 2016-06-23)
    Bachelor thesis
    Restricted access - confidentiality agreement
  • Analysis of roughness, force and vibration signals in ball-end milling processes 

    Álvarez Flórez, Jesús Andrés; Buj Corral, Irene; Vivancos Calvet, Joan (2015)
    Conference report
    Open Access
    In the present paper, roughness, force and vibration signals from ball-end milling processes are analysed. From the roughness signal actual feed value was obtained as expected. From the force and vibration signals both the ...
  • Assessment of remote cavitation detection methods with flow visualization in a full scale francis turbine 

    Escaler Puigoriol, Francesc Xavier; Vilberg, Ingrid; Ekanger, Jarle; Francke, H; Kjeldsen, Morten (2018)
    Conference report
    Open Access
    This paper describes the experimental investigations carried out in the Francis turbine at Svorka power plant operated by Statkraft in Norway. The unit, with a head of 260 m, can deliver a maximum output load of 25 MW. The ...
  • Axisymmetric vibrations of a circular Chladni plate in air and fully submerged in water 

    Escaler Puigoriol, Francesc Xavier; De la Torre Rodriguez, Oscar (2018-10-10)
    Article
    Restricted access - publisher's policy
    In this study, experimental and numerical analyses were performed to determine the effects of water loading on the axisymmetric modes of vibration of a circular plate. The plate was harmonically excited at its centre through ...
  • Characterization of ball-burnishing vibration-assisted process 

    Gómez-Gras, Giovanni; Travieso Rodriguez, Jose Antonio; González Rojas, Hernan Alberto; Nápoles Alberro, Amelia; Carrillo, Francisco; Dessein, Gilles (EUETIB, 2013-12)
    Conference lecture
    Open Access
    Este trabajo está dirigido al estudio del proceso de bruñido con bola asistido por una vibración. Se parte de considerar que dicha vibración ayudará al proceso, facilitando la deformación que se produce sobre la superficie ...
  • Closed-form equation for natural frequencies of beams under full range of axial loads modeled with a spring-mass system 

    Valle Fraga, Juan José; Fernández Martínez, Daniel; Madrenas Boadas, Jordi (2019-04-01)
    Article
    Open Access
    A new simple closed-form equation that accurately predicts the effect of an arbitrarily large constant axial load, residual stress or temperature shift on the natural frequencies of an uniform single-span beam, with various ...
  • Condition monitoring of pump-turbines. New challenges 

    Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Valentín Ruiz, David; Presas Batlló, Alexandre; Rodriguez Godoy, Cristian (2015-05)
    Article
    Open Access
    At present, pumped storage is the only system to store huge amounts of energy. The surplus of energy in the electrical grid is used for pumping water from a lower to a higher reservoir (pump operation). At peak hours or ...
  • Control of ground-borne underground railway-induced vibration from double-deck tunnel infrastructures by means of dynamic vibration absorbers 

    Noori, Beshshad; Arcos Villamarín, Robert; Clot Razquin, Arnau; Romeu Garbí, Jordi (2019-08-23)
    Article
    Restricted access - publisher's policy
    The aim of this study is to investigate the efficiency of Dynamic Vibration Absorbers (DVAs) as a vibration abatement solution for railway-induced vibrations in the framework of a doubledeck circular railway tunnel ...
  • Desenvolupament d'una aplicació per gestionar l'estimulació vibratòria en pacients amb lesió medul·lar incompleta 

    Prats Bisbe, Alba (Universitat Politècnica de Catalunya, 2018-06-29)
    Bachelor thesis
    Restricted access - author's decision
    Covenantee:  Institut Guttmann
    El projecte consisteix en el desenvolupament d'una aplicació mòbil pel control d'un dispositiu que genera estímuls vibratoris sobre pacients amb lesions medul·lars incompletes.
  • Design of a system for studying human gait on different surfaces and slopes 

    Trubat Ponti, Dídac (Universitat Politècnica de Catalunya, 2014-06)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
    This Master Thesis contains the first stages of the development process of a system to study human gait presenting a final concepts. Moreover, the Master Thesis covers the vibration analysis of a real prototype based on ...
  • Detection of hydraulic phenomena in francis turbines with different sensors 

    Valentín Ruiz, David; Presas Batlló, Alexandre; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Egusquiza Estévez, Eduard (Multidisciplinary Digital Publishing Institute (MDPI), 2019-09-19)
    Article
    Open Access
    Nowadays, hydropower is demanded to provide flexibility and fast response into the electrical grid in order to compensate the non-constant electricity generation of other renewable sources. Hydraulic turbines are therefore ...
  • Determinación de la presión sonora radiada por pistones circulares y anillos no planos usando un método numérico simplificado 

    Alba, J.; Arenas, J.P.; Rey, R. del (Universitat Politècnica de Catalunya. CIMNE, 2014)
    Article
    Open Access
    Aunque el estudio de la radiación sonora por membranas y placas no es nuevo, recientemente se ha desarrollado una gran cantidad de investigación sobre el tema para abordar aplicaciones actuales y futuras. Se han publicado ...
  • Development, characterization and test of an ultrasonic vibration-assisted ball burnishing tool 

    Jerez Mesa, Ramón; Travieso Rodriguez, Jose Antonio; Gómez Gras, Giovanni; Llumà Fuentes, Jordi (2018-03-01)
    Article
    Open Access
    This paper presents the design and characterization of an ultrasonic vibration-assisted ball burnishing (VABB) tool on Ti-6Al-4V. This process is based on the modification of conventional ball burnishing, by means of the ...
  • Development of a hybrid FE-SEA-experimental model 

    Clot Razquin, Arnau; Meggitt, J.W.R.; Langley, Rob; Elliott, A; moorhouse, A (2019-12-01)
    Article
    Restricted access - publisher's policy
    The vibro-acoustic response of complex structures with uncertain properties is a problem of great concern for modern industries. In recent years, much research has been devoted to the prediction of this response in the ...
  • Diagnosis methodology for identifying gearbox wear based on statistical time feature reduction 

    Saucedo Dorantes, Juan Jose; Delgado Prieto, Miquel; Osornio Rios, Roque A.; Romero Troncoso, René de Jesús (2017-01-01)
    Article
    Open Access
    Strategies for condition monitoring are relevant to improve the operation safety and to ensure the efficiency of all the equipment used in industrial applications. The feature selection and feature extraction are suitable ...
  • Diseño, implementación y desarrollo de una boya oceánografica para la medida del espectro direccional del oleaje. Parte I:Sistema de adquisición, procesado y transmisión de la información 

    Fernández Oltra, Rubén (Universitat Politècnica de Catalunya, 2016-09)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
    Diseño, implementación y desarrollo de los sistemas de adquisión, procesado, y transmisión de datos de una boya oceanográfica costera para la medida del espectro direccional del oleaje.