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Dissertations / Theses on the topic 'Levenberg Marquardt method'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Shan, Shidong. "A Levenberg-Marquardt method for large-scale bound-constrained nonlinear least-squares." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5648.

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The well known Levenberg-Marquardt method is used extensively for solving nonlinear least-squares problems. We describe an extension of the Levenberg- Marquardt method to problems with bound constraints on the variables. Each iteration of our algorithm approximately solves a linear least-squares problem subject to the original bound constraints. Our approach is especially suited to large-scale problems whose functions are expensive to compute; only matrix-vector products with the Jacobian are required. We present the results of numerical experiments that illustrate the effectiveness of the app
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2

Araneda, Evelyn 1974. "A variation of the Levenberg Marquardt method : an attempt to improve efficiency." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28609.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, June 2004.<br>"May 2004."<br>Includes bibliographical references (leaf 36).<br>The Levenberg-Marquardt method is an efficient and popular damped least square technique. This method is a combination between the Gauss and the steepest gradient descent methods, where the amount of damping used in each iteration is central in establishing the behavior of the system. Further, the damping is determined by four parameters, whose optimum values vary from model to model. An inappropriate selection
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3

Pitra, Michal. "Adaptivní regulátory s principy umělé inteligence v prostředí MATLAB - B&R." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217708.

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The diploma thesis is focused on an adaptive control, especially in a self-tuning controller area. The thesis is divided into two main parts. The first part deals with identification methods of the adaptive control. The recursive least squares algorithm and the neural network method are the most popular identification methods. These methods are contrasted and the identification quality evaluation is done. The second part compares various types of the adaptive controllers with a non-adjustable PSD controller. The adaptive controllers are investigated from the various identification method point
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4

Peters, Franciane Conceição. "Estratégia para a solução numérica do problema inverso da identificação de inclusões em domínio condutor." Universidade Federal de Juiz de Fora (UFJF), 2010. https://repositorio.ufjf.br/jspui/handle/ufjf/3481.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-02-23T19:26:50Z No. of bitstreams: 1 francianeconceicaopeters.pdf: 4730497 bytes, checksum: 201c60342a8bf9edc9b308fa50fafa54 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-02-24T12:08:43Z (GMT) No. of bitstreams: 1 francianeconceicaopeters.pdf: 4730497 bytes, checksum: 201c60342a8bf9edc9b308fa50fafa54 (MD5)<br>Made available in DSpace on 2017-02-24T12:08:43Z (GMT). No. of bitstreams: 1 francianeconceicaopeters.pdf: 4730497 bytes, checksum: 201c60342a8bf9edc9b308fa50fafa54 (MD5)
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5

Unnikrishnakurup, Sreedhar. "Etude expérimentale et numérique d'un essai de soudage TIG statique et estimation des paramètres du flux de chaleur." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20013/document.

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Le procédé de soudage à l'arc sous atmosphère inerte (TIG) est souvent employé pour des assemblages nécessitant une grande qualité du joint soudé. Les propriétés du joint soudé dépendent essentiellement du cycle thermique imposé par l'opération de soudage, de la composition chimique du matériau métallique et des mouvements convectifs du métal fondu dans le bain de fusion. L'écoulement du métal liquide dans le bain de fusion modifie la distribution de température en son sein et à proximité, ainsi que la forme géométrique du joint. Afin d'améliorer l'opération de soudage TIG, par exemple pour ac
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6

Abbas, Boushra. "Méthode de Newton régularisée pour les inclusions monotones structurées : étude des dynamiques et algorithmes associés." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS250/document.

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Cette thèse est consacrée à la recherche des zéros d'un opérateur maximal monotone structuré, à l'aide de systèmes dynamiques dissipatifs continus et discrets. Les solutions sont obtenues comme limites des trajectoires lorsque le temps t tend vers l'infini. On s'intéressera principalement aux dynamiques obtenues par régularisation de type Levenberg-Marquardt de la méthode de Newton. On décrira aussi les approches basées sur des dynamiques voisines.Dans un cadre Hilbertien, on s'intéresse à la recherche des zéros de l'opérateur maximal monotone structuré M = A + B, où A est un opérateur maximal
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7

Herrich, Markus. "Local Convergence of Newton-type Methods for Nonsmooth Constrained Equations and Applications." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-159569.

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In this thesis we consider constrained systems of equations. The focus is on local Newton-type methods for the solution of constrained systems which converge locally quadratically under mild assumptions implying neither local uniqueness of solutions nor differentiability of the equation function at solutions. The first aim of this thesis is to improve existing local convergence results of the constrained Levenberg-Marquardt method. To this end, we describe a general Newton-type algorithm. Then we prove local quadratic convergence of this general algorithm under the same four assumptions which
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8

Mrázek, Michal. "Adaptivní optimální regulátory s principy umělé inteligence v prostředí MATLAB - B&R." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217556.

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Master’s thesis describes adaptive optimal controller design which change parameters of algorithm based on the system information regard for optimal criterion. Generally, the optimal controller solves the problem of minimum states vector. Problems of desired value and steady-state error are solved by variation in optimization algorithm.
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9

Samek, Martin. "Adaptivní optimální regulátory s principy umělé inteligence v prostředí MATLAB - B&R." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218211.

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Master’s thesis describes adaptive optimal controller design and it’s settings. Identification with principles of artificial intelligence and recursive least squares identification with exponential and directional forgetting are compared separately and as part of controller. Adaptive optimal controller is tested on physical model and compared with solidly adjusted PSD controller. Possibilities of implementation of adaptive optimal controller into programmable logic controller B&R are show and tested.
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10

Ribeiro, Marcos Henrique Fonseca. "Modelos computacionais para simulações de tomografia por impedância elétrica e sua aplicação no problema de determinação da fração de ejeção cardíaca". Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/4509.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-05-15T14:59:59Z No. of bitstreams: 1 marcoshenriquefonsecaribeiro.pdf: 12873424 bytes, checksum: 2b2b91fd2a9726856a0486afa760fe2c (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-17T16:01:12Z (GMT) No. of bitstreams: 1 marcoshenriquefonsecaribeiro.pdf: 12873424 bytes, checksum: 2b2b91fd2a9726856a0486afa760fe2c (MD5)<br>Made available in DSpace on 2017-05-17T16:01:12Z (GMT). No. of bitstreams: 1 marcoshenriquefonsecaribeiro.pdf: 12873424 bytes, checksum: 2b2b91fd2a9726856a0486afa7
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11

Kaligora, Koffi. "Caractérisation du comportement mécanique des oxydes sous stoechiometriques sous températures et atmosphères controlées." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2062.

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Cette thèse porte sur le développement d’un moyen d’essai mécanique permettant de caractériser l’effet de la pression partielle d’oxygène sur le comportement mécanique des oxydes sous-stoechiométriques de type pérovskite utilisé pour leur propriété de semi-perméation. Pour étudier ces matériaux, un nouveau protocole expérimental a été développé, ainsi qu’une méthode numérique de dépouillement ad hoc. Les essais de compression diamétrale cyclique et fluage par compression diamétrale mis en place sont réalisés dans un four d’essais mécaniques à étanchéité renforcée permettant de maitriser l’atmo
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12

Medeiros, Luiz Antonio da Silva. "Acelerando o metodo de Levenberg-Marquardt para a minimização da soma de quadrados de funções com restrições de caixa." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307125.

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Orientadores: Francisco de Assis Magalhães Gomes Neto, Jose Mario Martinez<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica<br>Made available in DSpace on 2018-08-12T08:17:16Z (GMT). No. of bitstreams: 1 Medeiros_LuizAntoniodaSilva_D.pdf: 2528214 bytes, checksum: 42e1946a32b63c9fc5cd56b10d24d5cb (MD5) Previous issue date: 2008<br>Resumo: Neste trabalho, apresentamos um algoritmo iterativo para a minimização de somas de quadrados de funções suaves, com restrições de caixa. O algoritmo é fortemente inspirado no trabalho de Bi
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13

Matys, Libor. "Prediktivní regulátory s principy umělé inteligence v prostředí MATLAB - B&R." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217557.

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Master’s thesis deals with problems of predictive control especially Model (Based) Predictive Control (MBPC or MPC). Identifications methods are compared in the first part. Recursive least mean squares algorithm is compared with identification methods based on neural networks. Next parts deal with predictive control. There is described creation MPC with summing element and adaptive MPC. There is also compared fixed setting PSD controller with MPC. Responses on disturbance and changes of parameters of controlled plant are compared. Comparing is made on simulation models in MATLAB/Simulink and o
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14

Zapletal, Marek. "Implementace a testování vybraných optimalizačních metod pro úlohy odhadu parametrů simulačních modelů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254426.

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This thesis deals with design of appropriate optimization algorithms for purposes of newly developed tool Mechlab’s parameter estimation, which serves for parameter estimation of simulation models in Matlab/Simulink. Levenberg-Marquardt algorithm had been chosen among other gradient methods. On the other hand, genetic algorithm and simulated annealing had been chosen from category of soft computing techniques to be implemented. Chosen algorithms were tested on artifical problem of mechanical oscilator and also on real datasets from electronic throttle. Proposed simulated annealing worked in bo
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15

Špérová, Alice. "Výpočet oteplení elektrických točivých strojů metodou tepelných sítí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233457.

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Práce se zabývá konstrukcí a využitím tepelných sítí k simulaci oteplení elektrických motorů velkých výkonú. Po úvodu do termiky a teorie proudění je popsána konstrukce tří různých typů sítí pro odlišné ventilační schémata motoru. Dále jsou popsány optimalizační metody a jejich možnosti k tepelné optimalizaci motorů. Je vybrána a vysvělena Marquard-Levenbergova metoda a na konkrétním případě je vysvětleno její použití a výhody pro optimalizaci chlazení elektrického motoru. V závěru se práce zabývá také citlivostí teplotních sití na jednotlivé vstupní parametry, porovnáním simulací s měřenými v
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16

Altoumaimi, Rasha Talal. "Nonlinear Least-Square Curve Fitting of Power-Exponential Functions: Description and comparison of different fitting methods." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-38606.

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This thesis examines how to find the best fit to a series of data points when curve fitting using power-exponential models. We describe the different numerical methods such as the Gauss-Newton and Levenberg-Marquardt methods to compare them for solving non-linear least squares of curve fitting using different power-exponential functions. In addition, we show the results of numerical experiments that illustrate the effectiveness of this approach.Furthermore, we show its application to the practical problems by using different sets of data such as death rates and rocket-triggered lightning retur
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17

Běhounek, Tomáš. "Imaging Reflectometry Measuring Thin Films Optical Properties." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233857.

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V této práci je prezentována inovativní metoda zvaná \textit{Zobrazovací Reflektometrie}, která je založena na principu spektroskopické reflektometrie a je určena pro vyhodnocování optických vlastností tenkých vrstev .\ Spektrum odrazivosti je získáno z map intenzit zaznamenaných CCD kamerou. Každý záznam odpovídá předem nastavené vlnové délce a spektrum odrazivosti může být určeno ve zvoleném bodu nebo ve vybrané oblasti.\ Teoretický model odrazivosti se fituje na naměřená data pomocí Levenberg~-~Marquardtova algoritmu, jehož výsledky jsou optické vlastnosti vrstvy, jejich přesnost, a určení
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18

Liang, Shu-fang, and 梁淑芳. "A Parallel Back-Propagation Algorithm with the Levenberg Marquardt Method." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/18644310071227714685.

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碩士<br>東吳大學<br>資訊科學系<br>94<br>Due to the excellent learning capability of the artificial neural network (ANN), many researches are interesting in using it to solve problems in pattern recognition, cluster analysis, forecasting, etc. The ANN applications have been approved by many specialists and scholars from many fields of science. It's knows by practical application, ANN manipulates different learn rules, it’s disappear speed, variance and learn time, there are obvious differences. Among the supervised networks, the Back Propagation Network (BPN) model is the most popular and it is the basis
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19

Rezvani, Nargol. "Iterative Reconstruction Algorithms for Polyenergetic X-ray Computerized Tomography." Thesis, 2012. http://hdl.handle.net/1807/34865.

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A reconstruction algorithm in computerized tomography is a procedure for reconstructing the attenuation coefficientscient, a real-valued function associated with the object of interest, from the measured projection data. Generally speaking, reconstruction algorithms in CT fall into two categories: direct, e.g., filtered back-projection (FBP), or iterative. In this thesis, we discuss a new fast matrix-free iterative reconstruction method based on a polyenergetic model. While most modern x-ray CT scanners rely on the well-known filtered back-projection algorithm, the corresponding reconstructio
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20

Herrich, Markus. "Local Convergence of Newton-type Methods for Nonsmooth Constrained Equations and Applications." Doctoral thesis, 2014. https://tud.qucosa.de/id/qucosa%3A28495.

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In this thesis we consider constrained systems of equations. The focus is on local Newton-type methods for the solution of constrained systems which converge locally quadratically under mild assumptions implying neither local uniqueness of solutions nor differentiability of the equation function at solutions. The first aim of this thesis is to improve existing local convergence results of the constrained Levenberg-Marquardt method. To this end, we describe a general Newton-type algorithm. Then we prove local quadratic convergence of this general algorithm under the same four assumptions which
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21

Muniganti, Harikiran. "Inverse Problems in 3D Full-wave Electromagnetics." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5807.

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An inverse problem in Electromagnetics (EM) refers to the process of reconstructing the physical system by processing the measured data of its electromagnetic properties. Inverse problems are typically ill-posed, and this makes them far more challenging than the typically well-posed forward problem. The solution of such inverse problems finds applications in nondestructive testing and evaluation, biomedical imaging, geophysical exploration etc. This thesis addresses some inverse problems specific to the area of electromagnetics, arising in three different scenarios. The first problem is 3-D q
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