Browsing by Author "Sánchez, Javier"

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    AFM study of the early corrosion of a high strength steel in a diluted sodium chloride solution
    (2008-07) Sánchez, Javier; Fullea, José; Andrade, Carmen; Gaitero, Juan J.; Porro, Antonio; Tecnalia Research & Innovation
    The high strength steels employed as reinforcement in pre-stressed concrete structures are drawn wire steels of eutectoid composition with a pearlitic microstructure. This work is focused on the study, by atomic force microscopy, of the early stages of the corrosion of such steels as a consequence of their exposition to a sodium chloride solution. The obtained images show the pearlitic microstructure of the steel, with a preferential attack of the ferrite phase and the cementite acting as a cathode. The corrosion rate was determined by calculating the amount of material lost from a roughness analysis. The obtained results are in good agreement with the predictions of Galvelel's theory, according to which the corrosion rate slows down as the pit depth increases.
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    A "context evaluator" model for a multimodal user interface in driving activity
    (2011) Murgoitio, Jesús; Urquiza, Arkaitz; Larburu, Maider; Sánchez, Javier; CCAM; ROBOTICA_FLEX; POWERTRAIN; Tecnalia Research & Innovation
    Focused on new HMI for vehicles, this paper explains the methodology followed by Tecnalia to provide an evaluation of the context, based on sensors data, in order to achieve the optimum usability and ubiquity levels at any given moment, and finally to optimize the driving task from the safety point of view. The paper is divided into three sections. Firstly, there is an introduction in which the main concepts, multimodality and Ambient intelligence, are explained (section 1), and this is followed by the two projects related to the work shown here (section 2). In section 3 we will go on to describe the methodology used to obtain an evaluation of the context, as is necessary for a car HMI with multimodal capabilities. Finally, a particular "Context evaluator" is displayed in order to illustrate the methodology and report the work carried out.
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    Integrated modeling approach for highly electrified HEV. Virtual design and simulation methodology for advanced powertrain prototyping
    (2009) Valera, Juan José; Iglesias, Iñaki; Peña, Alberto; Martin, Adrian; Sánchez, Javier; INNOV_AIR_MOBIL; Tecnalia Research & Innovation
    Nowadays car development time from concept approval to Job 1 is between 2 and 5 years (with an average of 3 years), but in the coming years is necessary to reduce it in order to achieve the optimal 12-month car. On the other hand the penetration rate of alternative powertrains (electric, hybrid) is growing quickly, increasing the complexity of the vehicle and therefore development time cycle. Presented architecture and methodology in this paper, is based on virtual modelling of system/components, giving the possibility of an integrated vehicle virtual simulation, and also allowing the substitution of system/component models for real hardware (Hardware-ln-the-Loop, HiL), or even using the entire vehicle model in a driving simulator searching for Human-ln-the-Loop (HuiL) approaches. As far as the modelling represent the real system/components with accuracy, the use of these vehicle integrated virtual models will be more useful, allowing reduce the development time and also increasing vehicle overall quality.