Готові списки джерел за темами / DEFECT CORRECTION METHODS

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Добірка наукової літератури з теми "DEFECT CORRECTION METHODS"

Автор: Grafiati
Опубліковано: 29 лютого 2024

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Статті в журналах з теми "DEFECT CORRECTION METHODS"

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Skeel, Robert D., K. Bohmer, and H. J. Stetter. "Defect Correction Methods--Theory and Applications." Mathematics of Computation 47, no. 175 (1986): 374. http://dx.doi.org/10.2307/2008106.

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2

Haigang, Yang. "Defect-correction multigrid methods for nonlinear problems." Applied Mathematics and Computation 23, no. 4 (1987): 359–64. http://dx.doi.org/10.1016/0096-3003(87)90061-0.

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3

Frank, R., J. Hertling, and H. Lehner. "B-convergence properties of defect correction methods. I." Numerische Mathematik 49, no. 2-3 (1986): 139–62. http://dx.doi.org/10.1007/bf01389621.

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Frank, R., J. Hertling, and H. Lehner. "B-convergence properties of defect correction methods. II." Numerische Mathematik 49, no. 2-3 (1986): 163–88. http://dx.doi.org/10.1007/bf01389622.

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5

Ervin, V. J., W. J. Layton, and J. M. Maubach. "Adaptive Defect-Correction Methods for Viscous Incompressible Flow Problems." SIAM Journal on Numerical Analysis 37, no. 4 (2000): 1165–85. http://dx.doi.org/10.1137/s0036142997318164.

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Schuster, T. "Error estimates for defect correction methods in Doppler tomography." Journal of Inverse and Ill-posed Problems 14, no. 1 (2006): 83–106. http://dx.doi.org/10.1515/156939406776237465.

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Axelsson, O., and W. Layton. "Defect correction methods for convection dominated convection-diffusion problems." ESAIM: Mathematical Modelling and Numerical Analysis 24, no. 4 (1990): 423–55. http://dx.doi.org/10.1051/m2an/1990240404231.

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Gądek-Moszczak, Aneta, Leszek Wojnar, and Adam Piwowarczyk. "Comparison of Selected Shading Correction Methods." System Safety: Human - Technical Facility - Environment 1, no. 1 (2019): 819–26. http://dx.doi.org/10.2478/czoto-2019-0105.

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Анотація:
AbstractShade effect is a defect of the images very often invisible for human vision perception but may cause difficulties in proper image processing and object detection especially if the aim of the task is to proceed detection and quantitative analysis of the objects. There are several methods in image processing systems or presented in the literature, however some of them introduce unexpected changes in the images, what may interfere the final quantitative analysis. In order to solve this problem, authors proposed a new method for shade correction, which is based on simulation of the image background based on analytical methods which return pixel values representing smooth grey level changes. Comparison of the effects of correction by applying standard methods and the method proposed are presented.
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Kaya, Songul, William Layton, and Béatrice Rivière. "Subgrid Stabilized Defect Correction Methods for the Navier–Stokes Equations." SIAM Journal on Numerical Analysis 44, no. 4 (2006): 1639–54. http://dx.doi.org/10.1137/050623942.

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Cawood, M. E., V. J. Ervin, W. J. Layton, and J. M. Maubach. "Adaptive defect correction methods for convection dominated, convection diffusion problems." Journal of Computational and Applied Mathematics 116, no. 1 (2000): 1–21. http://dx.doi.org/10.1016/s0377-0427(99)00278-2.

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Дисертації з теми "DEFECT CORRECTION METHODS"

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Lai, Liang Simon. "Defect correction methods for computational aeroacoustics." Thesis, University of Greenwich, 2013. http://gala.gre.ac.uk/11452/.

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The idea of Defect Correction Method (DCM) has been around for a long time. It can be used in a number of different ways and can be applied to solve various linear and non-linear problems. Most defect correction related methods were used in conjunction with discretisation methods and two-level multigrid methods. This thesis examines how various iterative methods, both for linear and nonlinear problems, may be built into a unified framework through the use of defect correction. The framework is extended to the area of Computational Aeroacoustics (CAA) where sound waves generated by the pressure fluctuations are typically several orders of magnitude smaller than the pressure variations in the main flow field that accounts for flow acceleration. A decomposition of variables is used to break down the components of a typical flow variable into (1) the mean flow, (2) flow perturbations or aerodynamic sources of sound, and (3) the acoustic perturbation. The framework as discussed in this thesis would incorporate such variable decomposition. The basic principle of DCM can be applied to recover the propagating acoustic perturbation through a coupling technique. This provides an excellent concept in the re-use of existing commercial CFD software based on the framework and in the retrieval of acoustic pressure. Numerical examples demonstrating the defect correction framework for a typical car sun-roof problem was examined with promising numerical results. To this end the complete process of coupling Reynolds average Navier-Stokes and the Helmholtz equation is also presented using the DCM framework. The DCM framework is also extended to handle higher order numerical methods for the numerical solutions of partial differential equations leading to an easy re-use of existing software approximating derivatives with a lower order discretisation. Numerical experiments were performed to demonstrate the capability of the DCM framework. It is also used to a simplified 2-D problems aiming at the understanding of Large Eddy Simulation (LES) and filtering techniques. To this end the framework of DCM leads to an efficient and robust software implementation for many CFD and aeroacoustic computation in a simple nutshell.
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Siahaan, Antony. "Defect correction based domain decomposition methods for some nonlinear problems." Thesis, University of Greenwich, 2011. http://gala.gre.ac.uk/7144/.

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Анотація:
Defect correction schemes as a class of nonoverlapping domain decomposition methods offer several advantages in the ways they split a complex problem into several subdomain problems with less complexity. The schemes need a nonlinear solver to take care of the residual at the interface. The adaptive-∝ solver can converge locally in the ∞-norm, where the sufficient condition requires a relatively small local neighbourhood and the problem must have a strongly diagonal dominant Jacobian matrix with a very small condition number. Yet its advantage can be of high signicance in the computational cost where it simply needs a scalar as the approximation of Jacobian matrix. Other nonlinear solvers employed for the schemes are a Newton-GMRES method, a Newton method with a finite difference Jacobian approximation, and nonlinear conjugate gradient solvers with Fletcher-Reeves and Pollak-Ribiere searching direction formulas. The schemes are applied to three nonlinear problems. The first problem is a heat conduction in a multichip module where there the domain is assembled from many components of different conductivities and physical sizes. Here the implementations of the schemes satisfy the component meshing and gluing concept. A finite difference approximation of the residual of the governing equation turns out to be a better defect equation than the equality of normal derivative. Of all the nonlinear solvers implemented in the defect correction scheme, the nonlinear conjugate gradient method with Fletcher-Reeves searching direction has the best performance. The second problem is a 2D single-phase fluid flow with heat transfer where the PHOENICS CFD code is used to run the subdomain computation. The Newton method with a finite difference Jacobian is a reasonable interface solver in coupling these subdomain computations. The final problem is a multiphase heat and moisture transfer in a porous textile. The PHOENICS code is also used to solve the system of partial differential equations governing the multiphase process in each subdomain while the coupling of the subdomain solutions is taken care of with some FORTRAN codes by the defect correction schemes. A scheme using a modified-∝ method fails to obtain decent solutions in both single and two layers case. On the other hand, the scheme using the above Newton method produces satisfying results for both cases where it can lead an initially distant interface data into a good convergent solution. However, it is found that in general the number of nonlinear iteration of the defect correction schemes increases with the mesh refinement.
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Derlaga, Joseph Michael. "Application of Improved Truncation Error Estimation Techniques to Adjoint Based Error Estimation and Grid Adaptation." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/54592.

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Numerical solutions obtained through the use of Computational Fluid Dynamics (CFD) are subject to discretization error, which is locally generated by truncation error. The discretization error is extremely difficult to properly estimate and this in turn leads to uncertainty over the quality of the numerical solutions obtained via CFD methods and the engineering functionals computed using these solutions. Adjoint error estimation techniques specifically seek to estimate the error in functionals, but are dependent upon accurate truncation error estimates. This work examines the application of new, single-grid, truncation error estimation procedures to the problem of adjoint error estimation for both the quasi-1D and 2D Euler equations. The new truncation error estimation techniques are based on local reconstructions of the computed solutions and comparisons are made for the quasi-1D study in order to determine the most appropriate solution variables to reconstruct as well as the most appropriate reconstruction method. In addition, comparisons are made between the single-grid truncation error estimates and methods based on uniformally refining or coarsening the underlying numerical mesh on which the computed solutions are obtained. A method based on an refined grid error estimate is shown to work well for a non-isentropic flow for the quasi-1D Euler equations, but all truncation error estimations methods ultimately result in over prediction of functional discretization error in the presence of a shock in 2D. Alternatives to adjoint methods, which can only estimate the error in a single functional for each adjoint solution obtained, are examined for the 2D Euler equations. The defection correction method and error transport equations are capable of locally improving the entire computed solution, allowing for error estimates in multiple functionals. It is found that all three functional discretization error estimates perform similarly for the same truncation error estimate, although the defect correction method is the most costly from a computational viewpoint. Comparisons are made between truncation error and adjoint weighted truncation error based adaptive indicators. For the quasi-1D Euler equations it is found that both methods are competitive, however the truncation error based method is cheaper as a separate adjoint solve is avoided. For the 2D Euler equations, the truncation error estimates on the adapted meshes suffer due to a lack of smooth grid transformations which are used in reconstructing the computed solutions. In order to complete this work, a new CFD code incorporating a variety of best practices from the field of Computer Science is developed as well as a new method of performing code verification using the method of manufactured solutions which is significantly easier to implement than traditional manufactured solution techniques.<br>Ph. D.
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Chibi, Ahmed-Salah. "Defect correction and Galerkin's method for second-order elliptic boundary value problems." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47378.

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Cavard, Catherine. "Les deficits en ornithine transcarbamylase : un modele de correction d'un deficit enzymatique par transfert de genes." Paris 7, 1988. http://www.theses.fr/1988PA077026.

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Barbié, Laureline. "Raffinement de maillage multi-grille local en vue de la simulation 3D du combustible nucléaire des Réacteurs à Eau sous Pression." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4742.

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Le but de cette étude est d'améliorer les performances, en termes d'espace mémoire et de temps de calcul, des simulations actuelles de l'Interaction mécanique Pastille-Gaine (IPG), phénomène complexe pouvant avoir lieu lors de fortes montées en puissance dans les réacteurs à eau sous pression. Parmi les méthodes de raffinement de maillage, méthodes permettant de simuler efficacement des singularités locales, une approche multi-grille locale a été choisie car elle présente l'intérêt de pouvoir utiliser le solveur en boîte noire tout en ayant un faible nombre de degrés de liberté à traiter par niveau. La méthode Local Defect Correction (LDC), adaptée à une discrétisation de type éléments finis, a tout d'abord été analysée et vérifiée en élasticité linéaire, sur des configurations issues de l'IPG, car son utilisation en mécanique des solides est peu répandue. Différentes stratégies concernant la mise en oeuvre pratique de l'algorithme multi-niveaux ont également été comparées. La combinaison de la méthode LDC et de l'estimateur d'erreur a posteriori de Zienkiewicz-Zhu, permettant d'automatiser la détection des zones à raffiner, a ensuite été testée. Les performances obtenues sur des cas bidimensionnels et tridimensionnels sont très satisfaisantes, l'algorithme proposé se montrant plus performant que des méthodes de raffinement h-adaptatives. Enfin, l'algorithme a été étendu à des problèmes mécaniques non linéaires. Les questions d'un raffinement espace/temps mais aussi de la transmission des conditions initiales lors du remaillage ont entre autres été abordées. Les premiers résultats obtenus sont encourageants et démontrent l'intérêt de la méthode LDC pour des calculs d'IPG<br>The aim of this study is to improve the performances, in terms of memory space and computational time, of the current modelling of the Pellet-Cladding mechanical Interaction (PCI),complex phenomenon which may occurs during high power rises in pressurised water reactors. Among the mesh refinement methods - methods dedicated to efficiently treat local singularities - a local multi-grid approach was selected because it enables the use of a black-box solver while dealing few degrees of freedom at each level. The Local Defect Correction (LDC) method, well suited to a finite element discretisation, was first analysed and checked in linear elasticity, on configurations resulting from the PCI, since its use in solid mechanics is little widespread. Various strategies concerning the implementation of the multilevel algorithm were also compared. Coupling the LDC method with the Zienkiewicz-Zhu a posteriori error estimator in orderto automatically detect the zones to be refined, was then tested. Performances obtained on two-dimensional and three-dimensional cases are very satisfactory, since the algorithm proposed is more efficient than h-adaptive refinement methods. Lastly, the LDC algorithm was extended to nonlinear mechanics. Space/time refinement as well as transmission of the initial conditions during the remeshing step were looked at. The first results obtained are encouraging and show the interest of using the LDC method for PCI modelling
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Loy, Kak Choon. "Efficient Semi-Implicit Time-Stepping Schemes for Incompressible Flows." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36442.

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The development of numerical methods for the incompressible Navier-Stokes equations received much attention in the past 50 years. Finite element methods emerged given their robustness and reliability. In our work, we choose the P2-P1 finite element for space approximation which gives 2nd-order accuracy for velocity and 1st-order accuracy for pressure. Our research focuses on the development of several high-order semi-implicit time-stepping methods to compute unsteady flows. The methods investigated include backward difference formulae (SBDF) and defect correction strategy (DC). Using the defect correction strategy, we investigate two variants, the first one being based on high-order artificial compressibility and bootstrapping strategy proposed by Guermond and Minev (GM) and the other being a combination of GM methods with sequential regularization method (GM-SRM). Both GM and GM-SRM methods avoid solving saddle point problems as for SBDF and DC methods. This approach reduces the complexity of the linear systems at the expense that many smaller linear systems need to be solved. Next, we proposed several numerical improvements in terms of better approximations of the nonlinear advection term and high-order initialization for all methods. To further minimize the complexity of the resulting linear systems, we developed several new variants of grad-div splitting algorithms besides the one studied by Guermond and Minev. Splitting algorithm allows us to handle larger flow problems. We showed that our new methods are capable of reproducing flow characteristics (e.g., lift and drag parameters and Strouhal numbers) published in the literature for 2D lid-driven cavity and 2D flow around the cylinder. SBDF methods with grad-div stabilization terms are found to be very stable, accurate and efficient when computing flows with high Reynolds numbers. Lastly, we showcased the robustness of our methods to carry 3D computations.
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Fröhner, Anja. "Defektkorrekturverfahren für singulär gestörte Randwertaufgaben." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2002. http://nbn-resolving.de/urn:nbn:de:swb:14-1043050731546-74245.

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Wir untersuchen ein Defektkorrekturverfahren, das ein einfaches Upwind-Differenzenverfahren erster Ordnung mit einem zentralen Differenzenverfahren kombiniert, für ein- und zweidimensionale singulär gestörte Konvektions-Diffusions-Probleme auf einer Klasse von Shishkin-Typ-Gittern. Im eindimensionalen Fall wird nachgewiesen, dass das Verfahren von (fast) zweiter Ordnung, gleichmäßig bezüglich des Diffusionsparameters $\epsilon$ konvergiert. Zur Konvergenzanalyse für das zweidimensionale Modellproblem werden verschiedene Techniken diskutiert. In einem Spezialfall kann auf einem stückweise uniformen Shishkin-Gitter die $\epsilon$-gleichmäßige Konvergenz des Verfahrens von fast zweiter Ordnung gezeigt werden. Ferner sind die bisher bekannten Stabilitätsaussagen und ihre Verwendung zur Konvergenzanalysis der betrachteten Differenzenverfahren sowie Methoden zur Analyse von Defektkorrekturverfahren zusammengestellt. Einige Bemerkungen zu Defektkorrekturverfahren und Finite-Elemente-Methoden schließen die Arbeit ab. Numerische Experimente untermauern die theoretischen Resultate<br>We consider a defect correction method that combines a first-order upwinded difference scheme with a second-order central difference scheme for model singularly perturbed convection-diffusion problems in one and two dimensions on a class of Shishkin-Type meshes. In one dimension, the method is shown to be convergent uniformly in the diffusion parameter $\epsilon$ of second order in the discrete maximum norm. To analyze the two-dimensional case, we discuss several proof techniques for defect correction methods. For a special problem with constant coefficients on a piecewise uniform Shishkin-mesh we can show the second order convergence of the considered scheme, uniformly with respect to the diffusion parameter. Moreover the known stability properties and their impact on the convergence analysis of the considered differnce schemes are compiled. Some remarks on defect correction and finite elements conclude the theses. Numerical experiments support our theoretical results
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CHENG, YU-HSUN, and 鄭又勳. "Design Spectral Image Correction Methods for Optical Defects in Shortwave Infrared Liquid Crystal Tunable Filters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ey28mm.

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碩士<br>國立中正大學<br>資訊工程研究所<br>106<br>Short-wave infrared (SWIR) hyperspectral image (HSI) provides detailed spectral information regardless of target detection applications in military or search and rescue. While most HSI tasks image a static scene by a push-broom scanner, here a liquid crystal tunable filter (LCTF) is mounted in front of a broad-band SWIR camera to take snapshots of dynamic scenes. Due to the optical defects in LCTF, the collected images have pattern of interference fringes (PIF), which causes spatial and spectral distortion and interferes the target recognition tasks. Therefore, the purpose of this study is to develop a correction algorithm to eliminate PIF in the spectral images, and improve the recognition accuracy. We experimentally investigated the cause of PIF, and found the cost of hardware solution is very high. Therefore, we turned to develop algorithmic solutions. By collecting the reference images with PIF only, we examined three correction methods: (1) Template-based elimination, which directly subtracts the reference from the collected image; (2) Two-point correction, which uses two referenced intensities to derive a linear curve to predict the original pixel intensities; (3) Polynomial fitting, which uses multiple reference intensities to derive a nonlinear curve to predict the original pixel intensities. We found the third method is the most effective. Their technical details and corresponding experimental results are documented in the thesis.
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Ferrer, João Pedro Nunes. "A method of identification and correction of industrial robots defects using an inclinometer-based sensor." Master's thesis, 2015. http://hdl.handle.net/10316/29595.

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Tese de Mestrado em Robótica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>This work is integrated in a project of development of a novel measurement device, the BMG-4 sensor, and its application in the calibration of industrial robots. The aim of the work is to define procedures and strategies that enable, through the BMG-4, to identify both geometric and compliance errors that are present in 6-axes serial industrial robots. The importance of accuracy and robot calibration as well as the problem of the suitability of most measurement systems to industrial environments is highlighted. Consequently, the BMG-4 is introduced as a solution that meets the demands of those conditions. A geometrical methodology is defined to determine the direction of a robot’s axis and to assess its accuracy. A protocol that allows to identify the real angular geometric parameters of the robot, as well as the offsets of some axes is presented. Then, a strategy is developed in order to be able to identify the compliances of the last five axes of the robot. All the tests are performed in an ABB IRB 6600 industrial robot. For axes 2 and 3, the maximum values obtained for inaccuracy are 0,062° and 0,229°, respectively. Also, the robot presents several considerable joints’ offsets errors. For axes 4 and 5 those values are −0,99° and 0,83°. The combined offset of axes 2 and 3 is −0,28°. The stiffness of axis 2 is determined, having an estimated value of 2,4 × 106 N.m/rad. Finally, a standard robot convention is proposed in order to correct the identified errors with a generalized compensation algorithm.<br>Este trabalho está integrado num projeto de desenvolvimento de um novo dispositivo de medição, o sensor BMG-4, e da sua aplicação na calibração de robôs industriais. O objetivo do trabalho é a definição de procedimentos e estratégias que permitem, através do BMG-4, identificar erros provenientes tanto da geometria como da flexibilidade das articulações do robô que estão presentes em robôs industriais de 6-eixos. A importância da precisão e da calibração robótica, bem como o problema da adequação da maioria dos sistemas de medição em ambientes industriais são destacados. Consequentemente, o BMG-4 é introduzido como uma solução que satisfaz essas condições. Uma metodologia geométrica é definida para determinar a direção do eixo de um robô e para avaliar a sua precisão. Um protocolo que permite identificar os parâmetros geométricos angulares reais do robô, bem como os offsets de alguns eixos, é apresentado. Em seguida, uma estratégia é desenvolvida de maneira a identificar os valores de rigidez dos últimos cinco eixos do robô. Todos os testes são realizados no robô industrial ABB IRB 6600. Para os eixos 2 e 3, os valores máximos obtidos para a análise da imprecisão são 0,062° e 0,229°, respectivamente. Além disso, o robô apresenta erros de offset consideráveis. Para os eixos 4 e 5 esses valores são −0,99° e 0,83°. O valor combinado dos eixos 2 e 3 é −0,28°. A rigidez do eixo 2 é determinada, tendo um valor estimado de 2,4 × 106 N.m/rad. Finalmente, uma convenção standard de robôs é proposta e cuja finalidade é corrigir os erros previamente identificados através de um algoritmo de compensação global e independente do fabricante do robô considerado.
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Книги з теми "DEFECT CORRECTION METHODS"

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Diskin, Boris. Solving upwind-biased discretizations: Defect-correction iterations. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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2

1952-, Thomas James L., and Institute for Computer Applications in Science and Engineering., eds. Solving upwind-biased discretizations: Defect-correction iterations. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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3

1952-, Thomas James L., and Institute for Computer Applications in Science and Engineering., eds. Solving upwind-biased discretizations: Defect-correction iterations. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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4

Peterson, Peter Jeffrey. Global error estimation using defect correction techniques for explicit Runge-Kutta methods. University of Toronto, Dept. of Computer Science, 1986.

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5

A, Batterman, Sachs E. W, and Institute for Computer Applications in Science and Engineering., eds. Approximation of the Newton step by a defect correction process. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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6

A, Batterman, Sachs E. W, and Institute for Computer Applications in Science and Engineering., eds. Approximation of the Newton step by a defect correction process. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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7

Arian, Eyal. Approximation of the Newton step by a defect correction process. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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8

Obuhova, Galina, and Galina Klimova. Fundamentals of public communication skills: practical recommendations. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1090527.

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Анотація:
The textbook discusses the methodological foundations of the preparation and presentation of public speeches in various fields of activity, including business. The factors influencing the skill of the speaker are considered. Recommendations are given on the technique of conducting various types of public speeches and practical techniques of audience ownership are shown. Special attention is paid to the methods of establishing contact between the speaker and the audience and the psychological influence of the speaker on the audience. Practical recommendations and exercises for improving the speaker's speech technique are presented. Special attention is paid to the ways of correcting speech defects. &#x0D; Meets the requirements of the federal state educational standards of higher education of the latest generation.&#x0D; It is intended for teachers, lecturers of the educational system, students and postgraduates, managers, lawyers, as well as for managers of various levels who are aware of the importance of verbal communication in their professional field. It can also be useful for a wide range of readers.
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Böhmer, K. Defect Correction Methods: Theory and Applications. Springer London, Limited, 2012.

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10

Solving upwind-biased discretizations: Defect-correction iterations. Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1999.

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Частини книг з теми "DEFECT CORRECTION METHODS"

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Auzinger, Winfried. "Defect Correction Methods." In Encyclopedia of Applied and Computational Mathematics. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-540-70529-1_105.

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Hackbusch, Wolfgang. "Extrapolation and Defect Correction Techniques." In Multi-Grid Methods and Applications. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-02427-0_14.

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Heinrichs, Wilhelm. "Defect Correction for Convection Dominated Flow." In Numerical methods for the Navier-Stokes equations. Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-663-14007-8_12.

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4

Koren, Barry. "Multigrid and Defect Correction for the Steady Navier-Stokes Equations." In Robust Multi-Grid Methods. Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-322-86200-6_15.

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5

Koren, Barry. "Low-Diffusion Rotated Upwind Schemes, Multigrid and Defect Correction for Steady, Multi-Dimensional Euler Flows." In Multigrid Methods III. Birkhäuser Basel, 1991. http://dx.doi.org/10.1007/978-3-0348-5712-3_19.

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6

Juncu, Gh. "Preconditioned CG - Like Methods and Defect Correction for Solving Steady Incompressible Navier - Stokes Equations." In Notes on Numerical Fluid Mechanics (NNFM). Vieweg+Teubner Verlag, 1995. http://dx.doi.org/10.1007/978-3-663-14125-9_12.

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7

Schuster, Thomas. "Approaches for defect correction." In The Method of Approximate Inverse: Theory and Applications. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71227-5_9.

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8

Djambazov, Georgi S., Choi-Hong Lai, Koulis A. Pericleous, and Zong-Kang Wang. "A Defect Correction Method for Multi-Scale Problems in Computational Aeroacoustics." In Lecture Notes in Computational Science and Engineering. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56118-4_9.

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9

Spekreijse, S. P. "Second order accurate upwind solutions of the 2D steady Euler equations by the use of a defect correction method." In Lecture Notes in Mathematics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/bfb0072653.

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10

Bibrowicz, Karol, Tomasz Szurmik, Anna Lipowicz, and Andrzej W. Mitas. "Application of Original System to Support Specialist Physiotherapy D4S in Correction of Postural Defects as Compared to Other Methods—A Review." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49666-1_15.

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Тези доповідей конференцій з теми "DEFECT CORRECTION METHODS"

1

Kumar, Rohit, and Majnoo M. Gawture. "Defect Based Fatigue Life Predictions for Aluminum Castings." In Symposium on International Automotive Technology. SAE International, 2024. http://dx.doi.org/10.4271/2024-26-0289.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;Aluminum casting parts generally have inherent internal defects such as porosity which lowers the fatigue strength of such castings. Accounting for such a fatigue strength reduction for Aluminum casted parts is the primary purpose of this paper. Authors have used Murakami et al [&lt;span class="xref"&gt;1&lt;/span&gt;] approach to calculate porosity correction factor for fatigue. The actual material S-N curve is modified using fatigue factors to account for the fatigue strength reduction due to presence of porosity. This approach was then validated on one of the fatigue failure cases on Aluminum casted housing. There was a close match between the test data and proposed approach for fatigue prediction. With this approach, engineers will be able to do fatigue predictions in presence of material defects like porosity with simple porosity correction factor, rather than using complex modeling of porosity in FEA or using detailed fracture mechanics methods. Engineers can also be able to provide acceptable levels of porosity in castings based on the methods suggested in this paper.&lt;/div&gt;&lt;/div&gt;
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Malatesta, Giuliano, Andrea Meleddu, Robert Owen, and Mures Zarea. "Extension of Current Defect Assessment Methods for Gouge and Corrosion Defects in X80 Grade Pipeline." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90613.

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The increasing demand for natural gas affects the type of transportation, both from the strategic and the economic point of view. Long-distance pipelines are a safe and economic way to transport the gas from production sites to end users. Hence, pipes producers need to supply the market executing projects where high strength material is involved, to reduce the steel use. Among high strength steel grade pipes (X80 - X100 - X120), the X80 grade is already in use for a number of gas pipelines in the world since many years. There is a need to evaluate the suitability of extending the current Fitness For Purpose methods to X80 grade steel linepipe, since the existing guidance was developed and validated mainly on test data coming from steel pipes of grade lower than X80. Hence they could not be directly applied to X80 grade pipes, but should be experimentally verified, otherwise their straightforward extrapolation would be questionable. EPRG recognized the need to cover this gap and launched a specific project, aimed at verifying the applicability of the presently available criteria to X80 grade, with particular focus on corrosion and gouge types of defects, longitudinally oriented. The project includes the collection and review of available tests data and FFP criteria, and the identification of the most promising among those collected. Four hydraulic full scale burst tests on X80 representative pipes (helically and longitudinally welded) containing simulated corrosion and gouge defects have been carried out to experimentally verify the applicability of the criteria to the X80 grade pipes. The selected criteria for the corrosion (DNV RP-F101) and for the gouge (Battelle NG-18) defects revealed to be suitable for X80 grade pipes too, as demonstrated by the accuracy in predicting the failure pressure of the experimental tests and of the literature database. The criteria showed to be even more accurate for X80 grade than they were for lower grades. Finally, it is worth mentioning that the selected criteria did not need any correction factor for obtaining the best prediction. Such a result is a demonstration of the sound theory behind the criteria.
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Lee, Jaehoon, Jinseon Kim, Dongguk Han, et al. "A Failure Caused by Extended Cross-Defect in DRAM." In ISTFA 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.istfa2023p0187.

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Abstract As memory devices decrease in dimensions, particles are found to be a major source of defects in unexpected DRAM failures due to their relatively large size. Among many DRAM defects, cross-defects account for the majority of system failures for a long time. Hard cross-defects are frequently observed in the first test step. Most of these defective cells are repaired with row or column redundancy resources. However, after high voltage and temperature stress, some of the cross-defects can additionally spread to adjacent rows or columns with reduced resistance. Recently, a new type of bridge cross-defect accompanied by row failures has emerged. This can be detected electrically through current measurements of 2 wordline (WL) under active mode. But, these defects are not obvious even after both high temperature and voltage stress. The bridge causes intermittent failure in the row-direction during DRAM operation. This soft 2-WL bridge is considered a serious fault source that can cause uncorrectable error (UE) at the system level even though on-die error correction code (ODECC) is introduced. Therefore, it is very important to find, improve, and develop control methods on such defects for future DRAM enhancement. In this paper, 2-WL defects or extended cross-defect were intensively analyzed through electrical failure analysis (eFA) and physical FA (pFA). Results reveal fine particles as the cause.
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Marie, S., та M. Ne´de´lec. "A New Plastic Correction β for Underclad Defect in a Vessel Submitted to a Pressurised Thermal Shock". У ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93680.

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In the frame of the Reactor Pressured Vessel integrity demonstration, a defect assessment has to be performed considering a Pressurized Thermal Shock. Several approaches are proposed in different reference codes and standards. Usually, the analyses are based on analytical methods. An important effort has been made recently by CEA to improve these tools in the frame of R&amp;D activities funded by IRSN. For the assessment of an underclad defect in a vessel submitted to a pressurized thermal shock, the plasticity induced by cladding yielding is considered through the amplification β of the elastic stress intensity factor KI in the ferritic part of the vessel. The current solution in the French RSE-M code has been developed from a fitting of F.E. calculation results. A more physical solution is proposed in this paper. It takes into account two phenomena: the amplification of the elastic KI due to the plasticity in the cladding and a plastic zone correction in the ferritic part. The first amplification is determined assuming that the plasticity in the cladding could be represented as an imposed opening displacement on the crack lips.
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5

Lombard, Jean-Pierre, Je´roˆme Dupeux, Christian Dupont, Francois Garcin, and Ste´phane Baumhauer. "Mistuning Phenomena on Bladed Disk: Industrial Methods and Applications." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90205.

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This paper deals with the methods used at Snecma (SAFRAN Group) to simulate the real mistuned dynamic behavior of bladed disks. Many applications of the method on industrial cases are also presented. The dissymmetry of a real bladed disk, which is mainly generated by small deviations in its geometry, leads to different dynamic impedances of the blades. These variations in impedance cause significant amplification of the forced response of the bladed disk. We propose to focus on industrial methods that can be used to simulate the mistuned dynamic behavior of a bladed disk in the case of small “frequency mistuning” or of greater “large mistuning”. This method, based on the modal synthesis technique (Benfield and Hruda family), can be classified as a “first generation method”. The first originality of this method consists in taking into account major mistuning, such as that induced by an FOD event. A second innovation concerns the use of these methods to assess in probabilistic terms the correction factor to apply to the maximum dynamic level measured during engine certification tests. The first part of the paper relates to the proposed method and its validation for large-scale “shape” mistuning on an academic test case. In the second section, we present a number of industrial applications: • An application of “geometric mistuning” is presented on a bladed disk after an FOD event. The same kind of analysis as previously described is carried out and the numerical results are commented. • The mistuning analyses are carried out on an industrial blisk with a local defect. The sensitivity of the response amplification factor is calculated versus the mistuning rate using a probabilistic approach. • Another application of the mistuning strategy is discussed: it concerns the use of the mistuning method to specify the correction factor of partial dynamic strain gauge measurements in order to assess the maximum level of a bladed disk. • The last application is dedicated to the simulation of intentional mistuning to increase the aeroelastic stability of an industrial test case.
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Pukhova, Ekaterina, and Vladislav Vereshchagin. "Compensation of defects in printing process with histogram methods." In 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p41.

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A method of image preparation for printing reproduction is suggested. This method allows to automatically compensate transformations that occur during reproduction, by analyzing a histogram of test chart image and based on it, creating a compensation pre-correction function. It also takes into consideration the visual perception of images. Pre-correction function is applied to images at the prepress stage after all other corrections. It is aimed to compensate defects, occurring at the printing stage, caused by the process of tone value increase and restriction of tonal range reproduction. It is suggested to use a test chart, which is a gradient with an even increase of lightness in the range from 0 to 255. After printing the test chart its digital image is created by scanning. Then Gaussian filter is applied to the image with parameters according to the visual perception, and lightness distribution histogram is calculated. This histogram will have changes in lightness distribution in comparison with the original digital image. These changes will correspond to the influence of tone value increasing process during printing. The cumulative sum is calculated from the received histogram, and the pre-correction is being formed. And this precorrection applies to an image, prepared for printing in similar conditions as test chart. The algorithm was written on Python and allows to create a pre-correction using a press sheet with the test chart. It is shown that the use of the suggested method gives a positive result and doesn’t require expensive measurement equipment. Having a scanner calibrated for linear transmission of lightness and developed programming module is enough. This method was tested on electrographic printing equipment on three different types of paper. Statistic parameters of a histogram, such as mean, standard deviation and the Skewness, were used for evaluation. It is shown that the suggested method can be used as part of an automatized system based on histogram methods for image preparation before printing.
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7

Neifeld, Mark A. "Computer generated holography for digital storage using sparse data words: capacity and error tolerance." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thx4.

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Fourier transform holography offers potential benefits for the storage of digital data, including high speed retrieval, reduced alignment constraints, and a high degree of media defect tolerance. Computer generated holography (CGH) provides a means through which holographic storage may be realized by using binary media such as conventional optical disks and tape. The encoding cost for such a scheme as measured by the area overhead η A , the ratio of the number of hologram pixels to the number of information bits however, is quite high as compared with other methods of error correction encoding. When encoding a binary data word of length N that contains M ones and N – M zeros, we expect that for a fixed encoding cost, the reconstruction quality will decrease as M approaches N. This intuitive notion is verified in simulation. In this paper we will investigate the use of sparse data words (i.e., M « N) for holographic storage. It is found that encoding with a set of sparse words is preferred, from the perspectives of capacity and error tolerance, to other methods of improving reconstruction quality (e.g., increasing the superpixel size in Lee CGH). Sparse data words will also be investigated for other algorithms, such as direct binary search. Simulation results will be compared with optical reconstructions in order to characterize the effects of system imperfections, and other methods that provide some respite from the large capacity cost of CGH will also be presented.
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8

Weber, Y., J. Goxe, S. Alves, et al. "Advanced Failure Analysis on Silicon Pipeline Defects and Dislocations in Mixed-Mode Devices." In ISTFA 2014. ASM International, 2014. http://dx.doi.org/10.31399/asm.cp.istfa2014p0502.

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Abstract The presence of crystalline defects, including dislocations and pipeline defect, is detrimental to both the processing and the intrinsic quality of semiconductor devices. The electrical parametric or functional failures generated by those defects require accurate identification and proper classification in a continuous improvement mindset. Depending on the failure analyst choice of the investigation technique, the distinction between a dislocation and a pipeline defect can be difficult. In this paper, based on case studies of mixed-mode devices, the various electrical and physical FA investigation techniques are explored and compared. From an electrical investigation standpoint, fault localization techniques will be reviewed (Thermal Laser Stimulation and Photon Emission Microscopy) as well as the direct electrical measurements means (external measurement and nanoprobing AFP). From a physical analysis standpoint, the use of various methods after deprocessing will be considered: top down delineation etch, Atomic Force Microscopy (AFM), Scanning Microwave Microscopy (SMM), and Transmission Electron Microscopy (TEM). The position of the defect as well as its physical signature observed through the various methods will determine its proper classification and will determine the appropriate corrective actions. The paper will be concluded with a discussion on the physical differences between a dislocation and a pipeline defect, as well as insights into the wafer fab manufacturing process.
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9

Roser, Christoph, and David Kazmer. "Flexible Design Methodology." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/dfm-14016.

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Abstract A flexible design methodology is developed to minimize the effect of uncontrolled variation by modeling potential design and manufacturing corrections in the product development process. Using this flexibility methodology, the different defect modes and the likelihood of these defects occurring is evaluated. For every defect mode, all design change options are investigated including the cost and probability of selection. The expected cost of the initial design including design changes is determined, thus allowing development of improved, more flexible designs. The theoretical method is demonstrated using an example. The results indicate that small changes in design variables may reduce the likelihood and cost of future design changes, yet provide opportunity for downstream cost minimization.
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10

Feng, Lv, Zhou Gengyu, and Qian Haiyang. "Margins Assessment of Pressure-Temperature Limit Curves for a RPV." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85145.

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In order to prevent brittle fracture, the pressure and temperature in a reactor pressure vessel (RPV) is controlled by pressure-temperature (P-T) limit curves during the heat-up and cool-down processes. Nuclear power plants should update the P-T limit curves periodically, because of RPV material irradiation embrittlement. Too restricted P-T limit curves may cause difficulty of operating a reactor. The 2007 edition of the RCCM code Annex ZG provides a new method for defining the P-T limit curves. In this paper, two types of the P-T limit curves for a French type RPV are established by different methods, which are the current operation limits based on the 1993 edition of the RCCM code and the new proposed limits according to the 2007 edition of the code. The margins of the current P-T limit curves are evaluated by comparing with the new proposed limit curves. Furthermore, the reasonability of improvements of the new P-T limit curve method is discussed, and their individual effects are investigated, including the conventional defect size, the required material toughness and the stress intensity factor plastic correction. The present results indicate that the current P-T limit curves for the RPV studied are conservative and have about 25∼70 °C margin in the transition temperature range and about 10∼12MPa in the upper shell temperature range, depending on different conditions. The new P-T limit curve method, which not only removes some conservative assumptions in the previous method but also restricts some requirements, is more reasonable and can provide a relaxed operation window. Present results can be a reference for the nuclear power plant owner to release the operation limits and is helpful in enhancing our understanding of the P-T limit curve.
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Звіти організацій з теми "DEFECT CORRECTION METHODS"

1

Vito, L. F. Di, G. Mannucci, G. Demofonti, et al. CGX-00-003 Tenaris Double Joint for Deep Water Applications Subjected to Large Cyclic Plastic Strains. Pipeline Research Council International, Inc. (PRCI), 1994. http://dx.doi.org/10.55274/r0011808.

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The evaluation of the defect tolerance assessment for girth welded joints of seamless pipes for off-shore applications when subjected to large cyclic plastic strains. The reeling laying technique, which is considered to be the most severe from this point of view, has been considered and studied in depth in order to determine how the several plastic strain cycles suffered by the joint during the laying could affect the defect tolerability. Advanced Engineering Critical Assessment methods have been considered in the analysis as the BS 7910 FAD approach implemented with the corrections recommended by more recent studies (such as DNV-OS-F101) about the structures subjected to large plastic deformations. Then the reliability and conservativeness of the setup ECA procedure have been discussed on the basis of a dedicated large scale segment tests program performed on girth weld joints realized in house by Tenaris on X65 grade seamless pipe for deepwater applications. The paper demonstrated the good behavior of the Tenaris Double Joint by both toughness and tensile properties point of view by the light of the more recent and advanced ECA methodologies.
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Semiga and Tiku. PR-214-104505-R02 Improved Methods for Estimating Remaining Fatigue Life of ERW Pipelines. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010204.

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Анотація:
While the general fracture mechanics methodology for calculating fatigue life is well documented and validated, its application in the definition of pipeline system fatigue lives have differed from field experience. The source and magnitude of the conservatism inherent in the calculated fatigue life estimates are a concern when establishing integrity management programs. Of particular interest are the fatigue life estimates used in the integrity management programs for ERW pipeline systems that are primarily concerned with pipe wall anomalies oriented along the pipe axis. This project was initiated to consider several elements of the fatigue life estimation process to identify if there were sources of conservatism that could be better managed to permit integrity management programs to produce life estimates with known levels of conservatism. The project considered: - Ovality and misalignment stress concentration factors; - Fatigue crack growth rate (da/dN) material performance; and - Bulging correction factor. Both experimental and numerical simulation techniques were used to consider the impact of these factors on rate of fatigue crack growth of pipeline axially oriented defects. The project results were compared to existing codified treatments to quantify the level of conservatism inherent in the current state of practice. Recommendations were provided to enhance the precision and manage conservatism in fatigue crack growth rate calculations used in integrity management. This work has a related webinar.
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3

PR-214-104505-R01 Improved Methods for Estimating Remaining Fatigue Life of ERW Pipe. Pipeline Research Council International, Inc. (PRCI), 2011. http://dx.doi.org/10.55274/r0010744.

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Анотація:
While the general fracture mechanics methodology for calculating fatigue life is well documented and validated, its application in the definition of pipeline system fatigue lives have differed from field experience. The source and magnitude of the conservatism inherent in the calculated fatigue life estimates are a concern when establishing integrity management programs. Of particular interest are the fatigue life estimates used in the integrity management programs for ERW pipeline systems that are primarily concerned with pipe wall anomalies oriented along the pipe axis. This project was initiated to consider several elements of the fatigue life estimation process to identify if there were sources of conservatism that could be better managed to permit integrity management programs to produce life estimates with known levels of conservatism. The project considered: - Ovality and misalignment stress concentration factors; - Fatigue crack growth rate (da/dN) material performance; and - Bulging correction factor. Both experimental and numerical simulation techniques were used to consider the impact of these factors on rate of fatigue crack growth of pipeline axially oriented defects. The project results were compared to existing codified treatments to quantify the level of conservatism inherent in the current state of practice. Recommendations were provided to enhance the precision and manage conservatism in fatigue crack growth rate calculations used in integrity management.
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