Examinando por Autor "Lamikiz, Aitzol"

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  • Miniatura
    Ítem
    Experimental analysis of the powder flow in a continuous coaxial nozzle for laser metal deposition
    (Springer Science and Business Media Deutschland GmbH, 2026-04-01) Pedrolli, Lorenzo ; Arrizubieta Arrate, Jon Iñaki ; Bonifazi, Giulio; Lamikiz, Aitzol ; Achiaga, Beatriz; López García, Alejandro
    This work presents an experimental analysis of the powder flow from a continuous coaxial nozzle for Laser Metal Deposition (LMD), demonstrating the ability to identify the transients and high-speed process flow dynamics. High-speed video tracking of individual particles enabled detailed analysis of size, spatial distribution, and velocities, revealing significant flowrate variations over time of up to, which may compromise deposition quality. These oscillations emerge from the large number of interactions among particles, carrier gas, and nozzle walls, reflecting complex, self-excited flow dynamics not captured by time-averaged measurements. The standoff distance, defined as the optimal distance between the nozzle and the workpiece, was determined with unprecedented temporal resolution. In the most representative case, the average standoff distance was found to be approximately, with oscillations over time of up to, due to variations in both particle trajectories and quantity over time. The particle size distribution was consistent with the manufacturer’s specifications, a good indication of the method’s accuracy, and an error estimation is performed to determine the expected precision of the measurements. A key aspect of this work, and its main contribution, is the development of a workflow capable of tracking individual particles to determine the instantaneous powder mass flowrate, providing a reliable approach to monitor and optimize powder delivery in the LMD process.
  • Miniatura
    Ítem
    Fabrikazio gehigarriaren iraunkortasun-azterketa materiala aurreztea eta kontsumo energetikoa murriztea
    (Universidad del País Vasco = Euskal Herriko Unibertsitatea, Servicio de Publicaciones, 2021-10-19) Arrizubieta, Jon Iñaki ; Ukar Arrien, Olatz ; Ostolaza, Marta; Lamikiz, Aitzol; Ortega, Naiara
    Gizakiaren ekintzen ondoriozko aztarna ekologikoaren eragina murriztearen garrantziaren kontzientzia globala hedatuta dago egungo gizartean, baina oraindik beharrezkoa da aurrerapausoak ematea. Egora horren aurrean, Nazio Batuen Erakundeak 2015ean aurkeztutako Garapen Iraunkorrerako Helburuen artean, industriaren eta berrikuntzaren aldeko apustuaren beharrizana azpimarratu behar da. Ildo horretan, fabrikazio gehigarria materialaren erabilera murriztu eta kontsumo energetiko jasangarriaren alde egiteko aukera ezin hobea da. Beraz, teknologia horrek eskaintzen dituen abantailen azterketa gauzatu da artikulu honetan, baina betiere ikuspuntu jasangarri batetik eta ohiko teknologiekin alderatuz.