Now showing items 1-20 of 57

  • 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
    Restricted access - publisher's policy
    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, 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 ...
  • 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 ...
  • Development, characterization and test of an ultrasonic vibration-assisted ball burnishing tool 

    Jerez Mesa, Ramón; Travieso Rodriguez, Jose Antonio; Gómez Gras, David; 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 ...
  • 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.
  • Diseño y fabricación de una herramienta de torno asistida por vibración 

    Zaroual El Miri, Mustapha (Universitat Politècnica de Catalunya, 2017-06-15)
    Master thesis
    Open Access
    El presente trabajo se clasifica dentro del marco de trabajos de investigación científica, y pretende diseñar y fabricar una herramienta de torno asistida por vibración, que posibilita verificar si este fenómeno tiene algún ...
  • Disseny d'una màquina d'equilibrat per a pràctiques docents 

    González García, Ricardo (Universitat Politècnica de Catalunya, 2008-02)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
    Disseny d’una màquina d’equilibrat per a pràctiques docents és un projecte en el que es fa una descripció pormenoritzada de quin és el procediment necesssari per a poder aconseguir l’equilibrat efectiu en dos plans d’una ...
  • Dynamical models of a wire scanner 

    Barjau Condomines, Ana; Herranz Álvarez, Juan Francisco; Dehning, Bernd (2016-10-01)
    Article
    Restricted access - publisher's policy
    The accuracy of the beam profile measurements achievable by the current wire scanners at CERN is limited by the vibrations of their mechanical parts. In particular, the vibrations of the carbon wire represent the major ...
  • Dynamic representation of excitation sources on construction-induced vibration problems based on multiple harmonic loads applied on the ground 

    Arcos Villamarín, Robert; Clot Razquin, Arnau; Romeu Garbí, Jordi (2017)
    Conference report
    Restricted access - publisher's policy
    Construction machinery used in public works is a source of noise and vibration that generate annoyance to the surrounding residential buildings. Thus, prediction of noise and vibration levels that will be induced by these ...
  • Effects of a ball-burnishing process assisted by vibrations in G10380 steel specimens 

    Travieso Rodriguez, Jose Antonio; Gómez Gras, David; Dessein, Gilles; Carrillo, F J.; Alexis, Joël; Jorba Peiró, Jordi; Aubazac, Nathalie (2015-11-20)
    Article
    Open Access
    This paper explores the effects on the surface roughness, hardness and residual stress of G10380 steel specimens milled and treated with a ball-burnishing process assisted by vibrations. These vibrations are incorporated ...