Browsing by Author "Mendikoa, I."
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Item Collaborative product design and manufacturing with inventive approaches(2008-05) Mendikoa, I.; Sorli, M.; Barbero, J. I.; Carrillo, A.; Gorostiza, A.; RENOVABLES OFFSHORE; Tecnalia Research & Innovation; PROMETAL; CIRMETAL; Centros PRE-FUSION TECNALIA - (FORMER)Collaborative product design and manufacturing among distributed teams through the Internet is becoming more necessary as enterprises are distributing their activities throughout the world. Currently most of the design and manufacturing management systems of an enterprise do not consider all the involved product/process knowledge from the whole value chain. In addition, traditional failure detection approaches used in the design phase have important deficiencies, since it essentially is a brainstorming exercise initiated by probing the failures which might occur, and limited to absence of an intended or designed function. The approach presented in this paper deals with all these problems, addressing actual collaboration among distribution teams for product design and manufacturing, as well as problem detection with inventive approaches.Item Experimental studies on the hydrodynamic behavior of a semi-submersible offshore wind platform(CRC Press/Balkema, 2015) Nava, V.; Aguirre, G.; Galvan, J.; Sanchez-Lara, M.; Mendikoa, I.; Perez-Moran, G.; Soares, C. Guedes; RENOVABLES OFFSHORE; Tecnalia Research & InnovationIn this paper, the major results of an experimental tank test campaign on the hydrodynamics and dynamics of a floating offshore semisubmersible platform supporting a wind energy turbine are presented. The tests were performed by TECNALIA at the HMRC wave tank in Cork within the framework of the MARINET project. The prototype consisted in a four-column semisubmersible platform with a ring pontoon placed in 60-m-deep water and subject to a wave climate typical of the Basque Country coast; the tests were performed using a small (1:60) physical model following Froude scaling law. The turbine held by the prototype is the NREL 5MW baseline wind turbine. Mainly the investigation dealt with the identification of the characteristics of the platform: the results herein presented include outcomes from decay tests, response amplitude operators (RAOs) by means of tests in regular waves, irregular wave responses and fairlead mooring loads. The purpose of the work is to achieve a comprehensive system identification of the major properties of the platform; further, the experimental results have been used to validate the modeling of the structure and to compare them with the outcomes of numerical simulations obtaining by coupling commercial software and other data available in literature.Item Heat treatment process energy efficient design and optimisation(2013) Mendikoa, I.; Sorli, M.; Armijo, A.; García, L.; Erausquin, L.; Insunza, M.; Bilbao, J.; Friden, H.; Björk, A.; Bergfors, L.; Skema, R.; Alzbutas, R.; Iesmantas, T.; RENOVABLES OFFSHORE; Tecnalia Research & Innovation; DIGITALIZACIÓN Y AUTOMATIZACIÓN DE LA CONSTRUCCIÓN; Centros PRE-FUSION TECNALIA - (FORMER)Energy efficiency optimization ICT (Information and Communication Technology) solutions are currently being developed for energy saving in buildings and, to some ex-tent, also for the manufacturing domain. This paper describes an approach and ICT tool developed for manufacturing process energy efficiency optimization, in particular focused on the heat treatment process of steel casting parts. Traditionally this manufacturing process is designed based on experts experience selecting a predefined temperature-time curve provided customer specifications for the resulting steel parts. However this curve can actually be optimised in terms of energy consumption while keeping required mechanical properties. This improved design is what the tool here described provides, using knowledge based approach for process design and multivariate optimisation and simulation techniques for process optimisation.Item Jupiter’s Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019(2021-04) Sánchez-Lavega, A.; Anguiano-Arteaga, A.; Iñurrigarro, P.; Garcia-Melendo, E.; Legarreta, J.; Hueso, R.; Sanz-Requena, J. F.; Pérez-Hoyos, S.; Mendikoa, I.; Soria, M.; Rojas, J. F.; Andrés-Carcasona, M.; Prat-Gasull, A.; Ordoñez-Extebarria, I.; Rogers, J. H.; Foster, C.; Mizumoto, S.; Casely, A.; Hansen, C. J.; Orton, G. S.; Momary, T.; Eichstädt, G.; RENOVABLES OFFSHOREJupiter’s Great Red Spot (GRS), a giant anticyclone, is the largest and longest-lived of all the vortices observed in planetary atmospheres. During its history, the GRS has shrunk to half its size since 1879, and encountered many smaller anticyclones and other dynamical features that interacted in a complex way. In 2018–2020, while having a historically small size, its structure and even its survival appeared to be threatened when a series of anticyclones moving in from the east tore off large fragments of the red area and distorted its shape. In this work, we report observations of the dynamics of these interactions and show that as a result the GRS increased its internal rotation velocity, maintaining its vorticity but decreasing its visible area, and suffering a transient change in its otherwise steady 90-day oscillation in longitude. From a radiative transfer analysis and numerical simulations of the dynamics we show that the interactions affected the upper cloud tops of the GRS. We argue that the intense vorticity of the GRS, together with its larger size and depth compared to the interacting vortices, guarantees its long lifetime.