• Rational approximation of P-wave kinematics — Part 2: Orhorhombic media 

  Abedi M.M. (Geophysics, 2020-09)

  Orthorhombic anisotropy is a modern standard for 3D seismic studies in complex geologic settings. Several seismic data processing methods and wave propagation modeling algorithms in orthorhombic media rely on phase-velocity, ...

• A new acoustic assumption for orthorhombic media 

  Abedi M.M.; Stovas A. (Geophysical journal international, 2020-11)

  In exploration seismology, the acquisition, processing and inversion of P-wave data is a routine. However, in orthorhombic anisotropic media, the governing equations that describe the P-wave propagation are coupled with ...

• Equivalence between the DPG method and the Exponential Integrators for linear parabolic problems 

  Muñoz-Matute J.; Pardo D.; Demkowicz L. (Journal of Computational Physics, 2020-11)

  The Discontinuous Petrov-Galerkin (DPG) method and the exponential integrators are two well established numerical methods for solving Partial Di fferential Equations (PDEs) and sti ff systems of Ordinary Di fferential ...

• A DPG-based time-marching scheme for linear hyperbolic problems 

  Muñoz-Matute J.; Pardo D.; Demkowicz L. (Computer Methods in Applied Mechanics and Engineering, 2020-11)

  The Discontinuous Petrov-Galerkin (DPG) method is a widely employed discretization method for Partial Di fferential Equations (PDEs). In a recent work, we applied the DPG method with optimal test functions for the time ...

• Rational approximation of P-wave kinematics — Part 1: Transversely isotropic media 

  Abedi M.M. (Geophysics, 2020-09)

  In seismic data processing and several wave propagation modeling algorithms, the phase velocity, group velocity, and traveltime equations are essential. To have these equations in explicit form, or to reduce algebraic ...

• Sensitivity and Uncertainty Analysis by Discontinuous Galerkin of Lock-in Thermography for Crack Characterization 

  Omella A.J.; Celorrio R.; Pardo D. (Computer Methods in Applied Mechanics and Engineering, 2020-09)

  This work focuses on the characterization of narrow vertical cracks of nite size using optically excited lock-in thermography (OLT). To characterize these cracks, we need to solve an ill-posed inverse problem. As a previous ...

• Definition of tailor made cutting tools for machining of complex surfaces based on final surface shape 

  Gomez G.; De Lucio P.; Gonzalez H.; de Lacalle N.; Calleja A.; Barton M. (Proceedings - 2nd International Conference on Mathematics and Computers in Science and Engineering, MACISE 2020, 2020)

  In this work a design methodology to define the best geometry of cutting tool for complex surfaces is defined, being based on the final part surface geometry. The manufacture of components with tailor made shaped tools, ...

• The Construction of Conforming-to-shape Truss Lattice Structures via 3D Sphere Packing 

  van Sosin B.; Rodin D.; Sliusarenko H.; Barton M.; Elber G. (Computer-Aided Design, 2020-11)

  Truss lattices are common in a wide variety of engineering applications, due to their high ratio of strength versus relative density. They are used both as the interior support for other structures, and as structures on ...

• Manufacturing of screw rotors via 5-axis double-flank CNC machining 

  Bizzarri M.; Barton M. (Computer-Aided Design, 2020-11)

  We investigate a recently introduced methodology for 5-axis flank computer numerically controlled (CNC) machining, called double-flank milling [1]. We show that screw rotors are well suited for this manufacturing approach ...

• Machining of developable ruled surfaces using mathematical algorithms 

  Calleja A.; Gonzalez H.; Polvorosa R.; Amigo F.; Gomez G.; Fernandez P.; Barton M.; Bo P.; de Lacalle N. (DYNA, 2020)

• SPM 2020 Editorial 

  Li X.; Barton M.; Nelaturi S. (Computer-Aided Design, 2020-07)

• Characterizing envelopes of moving rotational cones and applications in CNC machining 

  Skopenkov M.; Bo P.; Barton M.; Pottmann H. (Computer Aided Geometric Design, 2020-10)

  Motivated by applications in CNC machining, we provide a characterization of surfaces which are enveloped by a one-parametric family of congruent rotational cones. As limit cases, we also address ruled surfaces and their ...

• A Painless Automatic hp-Adaptive Strategy for Elliptic Problems 

  Darrigrand V.; Pardo D.; Chaumont-Frelet T.; Gómez-Revuelto I.; Garcia-Castillo E. (Finite Elements in Analysis and Design, 2020-01)

  In this work, we introduce a novel hp-adaptive strategy. The main goal is to minimize the complexity and implementational efforts hence increasing the robustness of the algorithm while keeping close to optimal numerical ...

• Bearing assessment tool for longitudinal bridge performance 

  Garcia-Sanchez D.; Fernandez-Navamuel A.; Zamora D.; Alvear D.; Pardo D. (Journal of Civil Structural Health Monitoring, 2020-09)

  This work provides an unsupervised learning approach based on a single-valued performance indicator to monitor the global behavior of critical components in a viaduct, such as bearings. We propose an outlier detection ...

• Design of Loss Functions for Solving Inverse Problems using Deep Learning 

  Rivera J.A.; Pardo D.; Alberdi E. (Computational Science – ICCS 2020, 2020-05)

  Solving inverse problems is a crucial task in several applications that strongly a ffect our daily lives, including multiple engineering fields, military operations, and/or energy production. There exist different methods ...

• Adaptive Solution of a Singularly-Perturbed Convection-Diffusion Problem Using a Stabilized Mixed Finite Element Method 

  Gonzalez M.; Strugaru M. (Radu F., Kumar K., Berre I., Nordbotten J., Pop I. (eds) Numerical Mathematics and Advanced Applications ENUMATH 2017. ENUMATH 2017. Lecture Notes in Computational Science and Engineering, vol 126. Springer, Cham, 2019-01-05)

  We explore the applicability of a new adaptive stabilized dual-mixedfinite element method to a singularly-perturbed convection-diffusion equation withmixed boundary conditions. We establish the rate of convergence when the ...

• Stabilization and a posteriori error analysis of a mixed FEM for convection–diffusion problems with mixed boundary conditions 

  Gonzalez M.; Strugaru M. (Journal of Computational and Applied Mathematics, 2020-06-02)

  We introduce a new augmented dual-mixed finite element method for the linear convection-diffusion equation with mixed boundary conditions. The approach is based on adding suitable residual type terms to a dual-mixed ...

• Blisk blades manufacturing technologies analysis 

  Calleja A.; Gonzalez H.; Polvorosa R.; Gomez G.; Ayesta I.; Barton M.; de Lacalle N. (Procedia Manufacturing, 2019-06)

  The paper presents blisk blades manufactured by different manufacturing processes. In this sense, different milling trajectories are presented, and, super abrasive machining strategies and EDM technologies are also tested. ...

• A Deep Neural Network as Surrogate Model for Forward Simulation of Borehole Resistivity Measurements 

  Shahriari M.; Pardo D.; Moser B. (Procedia Manufacturing, 2020-01)

  Inverse problems appear in multiple industrial applications. Solving such inverse problems require the repeated solution of the forward problem. This is the most time-consuming stage when employing inversion techniques, ...

• Borehole Resistivity Simulations of Oil-Water Transition Zones with a 1.5D Numerical Solver 

  Shahriari M.; Pardo D. (Computational Geosciences volume, 2020)

  When simulating borehole resistivity measurements in a reservoir, it is common to consider an oilwater contact (OWC) planar interface. However, this consideration can lead to an unrealistic model since in the presence of ...

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