Browsing Simulation of Wave Propagation by Title
Now showing items 1-20 of 233
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1.5D BASED INVERSION OF LOGGING-WHILE-DRILLING RESISTIVITY MEASUREMENTS IN 3D FORMATIONS
Pardo, D.
; Torres-Verdín, C. (2017-06)
This manuscript describes an extension of a computer method developed for the fast inversion of logging-while-drilling (LWD) resistivity measurements Pardo and Torres-Verdín (2015); Bakr et al. (2016). The method enables ... -
1D Painless Multi-level Automatic Goal-Oriented h and p Adaptive Strategies Using a Pseudo-Dual Operator
Caro, F.V.; Darrigrand, V.; Alvarez-Aramberri, J.; Alberdi, E.; Pardo, D. (2022-01-01)
The main idea of our Goal-Oriented Adaptive (GOA) strategy is based on performing global and uniform h- or p-refinements (for h- and p-adaptivity, respectively) followed by a coarsening step, where some basis functions are ... -
2.5-D Deep Learning Inversion of LWD and Deep-Sensing em Measurements Across Formations with Dipping Faults
Noh, Kyubo; Pardo, D.; Torres-Verdin, Carlos (2022-01-01)
Deep learning (DL) inversion of induction logging measurements is used in well geosteering for real-time imaging of the distribution of subsurface electrical conductivity. We develop a DL inversion workflow to solve 2.5-D ... -
3D hp-Adaptive Finite Element Simulations of Bend, Step, and Magic-T Electromagnetic Waveguide Structures
Gomez-Revuelto, I.; Garcia-Castillo, L.E.; Llorente-Romano, S.; Pardo, D. (2014-03)
Metallic rectangular waveguides are often the preferred choice on telecommunication systems and medical equipment working on the upper microwave and millimeter wave frequency bands due to the simplicity of its geometry, ... -
5-axis double-flank CNC machining of spiral bevel gears via custom-shaped milling tools -- Part I: modeling and simulation
Bo, P.; Gonzalez, H.; Calleja, A.; Lopez de Lacalle, N.; Barton, M. (2019-11-20)
A new category of 5-axis flank computer numerically controlled (CNC) machining, called \emph{double-flank}, is presented. Instead of using a predefined set of milling tools, we use the shape of the milling tool as a free ... -
5-axis double-flank CNC machining of spiral bevel gears via custom-shaped tools – Part II: physical validations and experiments
Gomez, G.; Bo, P.; Gonzalez, H.; Calleja, A.; Barton, M.; Lopez de Lacalle, N. (2021-10)
Recently, a new methodology for 5-axis flank computer numerically controlled (CNC) machining, called double-flank machining, has been introduced (see “5-axis double-flank CNC machining of spiral bevel gears via custom-shaped ... -
Accessibility for Line-Cutting in Freeform Surfaces
van Sosin, B.; Barton, M.; Elber, G. (2019-04-26)
Manufacturing techniques such as hot-wire cutting, wire-EDM, wire-saw cutting, and flank CNC machining all belong to a class of processes called line-cutting where the cutting tool moves tangentially along the reference ... -
Adaptive Solution of a Singularly-Perturbed Convection-Diffusion Problem Using a Stabilized Mixed Finite Element Method
Gonzalez, M.; Strugaru, M. (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 ... -
Adjoint-based formulation for computing derivatives with respect to bed boundary positions in resistivity geophysics
Chaumont-Frelet, T.; Shahriari, M.; Pardo, D. (2019-02)
In inverse geophysical resistivity problems, it is common to optimize for specific resistivity values and bed boundary positions, as needed, for example, in geosteering applications. When using gradient-based inversion ... -
An Agent-Oriented Hierarchic Strategy for Solving Inverse Problems
Smolka, M.; Schaefer, R.; Paszynski, M.; Pardo, D.; Alvarez-Aramberri, J. (2015-12-31)
The paper discusses the complex, agent-oriented hierarchic memetic strategy (HMS) dedicated to solving inverse parametric problems. The strategy goes beyond the idea of two-phase global optimization algorithms. The global ... -
Algebraic equations for constant width curves and Zindler curves
Rochera, D. (2022-03)
An explicit method to compute algebraic equations of curves of constant width and Zindler curves generated by a family of middle hedgehogs is given thanks to a property of Chebyshev polynomials. This extends the methodology ... -
An Algorithm based on continuation techniques for minimization problems with highly non linear equality constraints
Alberdi, E.; Antoñana, M.; Makazaga, J.; Murua, A. (2021)
We present an algorithm based on continuation techniques that can be applied to solve numerically minimization problems with equality constraints. We focus on problems with a great number of local minima which are hard to ... -
Analysis of extreme wave events on the southern coast of Brazil
(2014-12-31)Using the wave model SWAN (simulating waves nearshore), high waves on the southwestern Atlantic generated by extra-tropical cyclones are simulated from 2000 to 2010, and their impact on the Rio Grande do Sul (RS) coast is ... -
Approximations for traveltime, slope, curvature, and geometrical spreading of elastic waves in layered transversely isotropic media
Abedi, M.M.; Pardo, D.; Stovas, A. (2021-10)
Each seismic body wave, including quasi compressional, shear, and converted wave modes, carries useful subsurface information. For processing, imaging, amplitude analysis, and forward modeling of each wave mode, we need ... -
Arithmetic method of double-injection-electrode model for resistivity measurement through metal casing
Chen, Q.; Pardo, D.; Li, H.-B.; Wang, F.-R.; Ye, Q.-Z. (2010-12-31)
Through-casing resistivity (TCR) measurement instruments such as Cased Hole Formation Resistivity are extensively used for the dynamic monitoring of oil reservoirs during the production phase in oil wells to evaluate the ... -
Asymptotic Models for the Electric Potential across a Highly Conductive Casing
Erdozain, A.; Péron, V.; Pardo, D. (2018-07)
We analyze a configuration that involves a steel-cased borehole, where the casing that covers the borehole is considered as a highly conductive thin layer. We develop an asymptotic method for deriving reduced problems ... -
Automatic fitting of conical envelopes to free-form surfaces for flank CNC machining
Bo, P.; Barton, M.; Pottmann, H. (2017-10)
We propose a new algorithm to detect patches of free-form surfaces that can be well approximated by envelopes of a rotational cone under a rigid body motion. These conical envelopes are a preferable choice from the ... -
Automatic Red-Channel underwater image restoration
Galdran, A.; Pardo, D.; Picón, A.; Alvarez-Gila, A. (2015-12-31)
Underwater images typically exhibit color distortion and low contrast as a result of the exponential decay that light suffers as it travels. Moreover, colors associated to different wavelengths have different attenuation ... -
Bearing assessment tool for longitudinal bridge performance
Garcia-Sanchez, D.; Fernandez-Navamuel, A.; Zamora, D.; Alvear, D.; Pardo, D. (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 ... -
A blackbox optimization of volumetric heating rate for reducing the wetness of the steam flow through turbine blades
Hoseinzade, D.; Lakzian, E.; Hashemian, A. (2021-01)
This paper proposes to use a blackbox optimization to obtain the optimal volumetric heating required to reduce the wetness at the last stages of steam turbines. For this purpose, a global multiobjective optimization is ...