Ara es mostren els items 101-120 de 145

    • Nonintrusive parametric NVH study of a vehicle body structure 

      Cavaliere, Fabiola; Zlotnik, Sergio; Sevilla Càrdenas, Ruben; Larráyoz Izcara, Xabier; Díez, Pedro (Taylor & Francis Group, 2022-06-27)
      Article
      Accés obert
      A reduced order model technique is presented to perform the parametric Noise, Vibration and Harshness (NVH) study of a vehicle body-in-white (BIW) structure characterized by material and shape design variables. The ultimate ...
    • Nonintrusive parametric solutions in structural dynamics 

      Cavaliere, Fabiola; Zlotnik, Sergio; Larráyoz Izcara, Xabier; Díez, Pedro (2022-02-01)
      Article
      Accés obert
      A nonintrusive reduced order method able to solve a parametric modal analysis is proposed in this work. The main objective is being able to efficiently identify how a variation of user-defined parameters affects the dynamic ...
    • Nonintrusive reduced order model for parametric solutions of inertia relief problems 

      Cavaliere, Fabiola; Zlotnik, Sergio; Sevilla Cárdenas, Rubén; Larráyoz Izcara, Xabier; Díez, Pedro (John Wiley & sons, 2021-08-30)
      Article
      Accés obert
      The Inertia Relief (IR) technique is widely used by industry and produces equilibrated loads allowing to analyze unconstrained systems without resorting to the more expensive full dynamic analysis. The main goal of this ...
    • Nonintrusive stochastic finite elements for crashworthiness with VPS/Pamcrash 

      Rocas, Marc; García González, Alberto; Larráyoz Izcara, Xabier; Díez, Pedro (2020-01-13)
      Article
      Accés obert
      Crashworthiness analysis remains an important concern for the design of safety structures. In this context, uncertainties play an essential role in the response of a crash problem with non linear behavior. With this statement ...
    • Nonintrusive uncertainty quantification for automotive crash problems with VPS/Pamcrash 

      Rocas Alonso, Marc; García González, Alberto; Zlotnik, Sergio; Larráyoz Izcara, Xabier; Díez, Pedro (2021-10-01)
      Article
      Accés obert
      Uncertainty Quantification (UQ) is a key discipline for computational modeling of complex systems, enhancing reliability of engineering simulations. In crashworthiness, having an accurate assessment of the behavior of the ...
    • Nonlinear dimensionality reduction for parametric problems: a kernel proper orthogonal decomposition 

      Díez, Pedro; Muixí Ballonga, Alba; Zlotnik, Sergio; García González, Alberto (John Wiley & sons, 2021-12-30)
      Article
      Accés obert
      Reduced-order models are essential tools to deal with parametric problems in the context of optimization, uncertainty quantification, or control and inverse problems. The set of parametric solutions lies in a low-dimensional ...
    • Numerical estimation of the bearing capacity of resistance spot welds in martensitic boron steels using a J-integral fracture criterion 

      Dorribo Dorribo, Daniel; Greve, Lars; Díez, Pedro; Arias Vicente, Irene; Larráyoz Izcara, Xabier (2018-08-01)
      Article
      Accés obert
      Predicting the bearing capacity of resistance spot welds (RSW) during vehicle crash tests has become a crucial task for the automotive industry, since the recent introduction of advanced high strength steels (AHSS) such ...
    • Numerical modeling of erosion using an improvement of the extended finite element method 

      Cottereau, Régis; Díez, Pedro (2011)
      Article
      Accés obert
      We present in this paper a numerical model of the erosion of a soil that accounts for both the flow in the open fluid and the flow of fluid through the porous soil. The interface between the open fluid and the soil is ...
    • Numerical modeling of the double punch test for plain concrete 

      Pros Parés, Alba; Díez, Pedro; Molins i Borrell, Climent (2011-04)
      Article
      Accés obert
      Double punch test is used to indirectly assess the tensile strength of plain concrete, ft. For this normalized test, the tensile strength is obtained as a function of the failure load, P, which is expressed as f_t = F(P). ...
    • Numerical modeling of undersea acoustics using a partition of unity method with plane waves enrichment 

      Hospital Bravo, Raúl; Sarrate Ramos, Josep; Díez, Pedro (2016-05)
      Article
      Accés obert
      A new 2D numerical model to predict the underwater acoustic propagation is obtained by exploring the potential of the Partition of Unity Method (PUM) enriched with plane waves. The aim of the work is to obtain sound pressure ...
    • Numerical modelling of multi-phase multi-component reactive transport in the Earth's interior 

      Oliveira, Beñat; Afonso, Juan Carlos; Zlotnik, Sergio; Díez, Pedro (2018-01-01)
      Article
      Accés obert
      We present a conceptual and numerical approach to model processes in the Earth's interior that involve multiple phases that simultaneously interact thermally, mechanically and chemically. The approach is truly multiphase ...
    • Numerical modelling of tectonic plates subduction using X-FEM 

      Zlotnik, Sergio; Díez, Pedro; Fernández, M.; Verges, J. (2007-09)
      Article
      Accés obert
      The numerical modelling of plate subduction requires solving a coupled thermo-mechanical highly-nonlinear transient problem. The mechanical description of the phenomenon results in a multiphase quasi-static Stokes flow, ...
    • Numerical tool for modeling steel fiber reinforced concrete 

      Molins i Borrell, Climent; Pros Parés, Alba; Díez, Pedro (International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Steel Fiber Reinforced Concrete (SFRC) allows overcoming brittleness and weakness in tension, the main drawbacks of plain concrete. The goal of the present presentation is to present an ad-hoc numerical strategy to account ...
    • On the statement and numerical solution of the thermal problem within inversion methods for the study of lithospheric structure 

      Fernández, Mariano Tomás; Zlotnik, Sergio; Díez, Pedro (European Geosciences Union (EGU), 2023)
      Comunicació de congrés
      Accés obert
      One of the goals of geophysicists is mapping and understanding the current structure of the Earth including its variations in composition, temperature and dynamical state. This structure is only accessible via indirect ...
    • Parametric electromagnetic analysis of radar-based Advanced Driver Assistant Systems 

      Vermiglio, Simona; Champaney, Victor; Sancarlos, Abel; Daim, Fatima; Kedzia, Jean Claude; Duval, Jean Louis; Díez, Pedro; Chinesta Soria, Francisco (Multidisciplinary Digital Publishing Institute (MDPI), 2020-10-05)
      Article
      Accés obert
      Efficient and optimal design of radar-based Advanced Driver Assistant Systems (ADAS) needs the evaluation of many different electromagnetic solutions for evaluating the impact of the radome on the electromagnetic wave ...
    • PGD-based “Computational Vademecum” for efficient design, optimization and control 

      Chinesta, Francisco; Leygue, Adrien; Bordeu, F.; Cueto Prendes, Elias; González, David; Alfaro, Icíar; Ammar, Amine; Huerta, Antonio; Díez, Pedro (2013)
      Article
      Accés restringit per política de l'editorial
      D espite the impressive progresses attained by simulation capabilities and techniques, some challenging problems remain today intractable. These prob- lems, that are common to many branches of science and engineering, ...
    • Physics-based manifold learning in scaffolds for tissue engineering: application to inverse problems 

      Muixí Ballonga, Alba; Zlotnik, Sergio; García González, Alberto; Díez, Pedro (2022-10-03)
      Article
      Accés obert
      In the field of bone regeneration, insertion of scaffolds favours bone formation by triggering the differentiation of mesenchymal cells into osteoblasts. The presence of Calcium ions (Ca2+) in the interstitial fluid across ...
    • Preface 

      Chamoin, Ludovic; Díez, Pedro (Springer, 2016)
      Capítol de llibre
      Accés restringit per política de l'editorial
      The error associated with a numerical solution is intimately related with the residual, that is the lack of verification of the equation by the approximated solution. The residual is computable but obtaining the exact ...
    • Preface 

      Wiberg, N E; Díez, Pedro (2006-01)
      Article
      Accés obert
    • Probabilistic analysis of an a posteriori error estimator for finite elements 

      Díez, Pedro; Egozcue Rubí, Juan José (2001-08)
      Article
      Accés obert
      A residual type a posteriori error estimator for finite elements is analyzed using a new technique. In this case, the error estimate is the result of two consecutive projections of the exact error on two finite-dimensional ...