Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 124 for “"Newton-Raphson"”.
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Control of Agentic Systems Using the Newton-Raphson Controller
The Newton-Raphson Controller is a tracking controller for dynamical systems. Existing results have shown the effectiveness of the controller for a number of nonlinear systems, for example, inverted pendulums, autonomous vehicles and quadrotors. Although this controller has reached a performance …
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Analysis of pipe networks based on the Newton-Raphson method.
Massachusetts Institute of Technology, Dept. of Civil Engineering, Thesis. 1965. M.S.
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Dynamic modelling and simulation of electric power systems using the Newton-Raphson method
… of a dynamic power flow computer algorithm using Newton's method. It addresses both the development of a positive sequence dynamic power flow algorithm for the dynamic study of balanced power systems and a fully-fledged three-phase dynamic power flow algorithm for the dynamic study of power …
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Finite element algorithms for the static and dynamic analysis of time-dependent and time-independent plastic bodies
… the form of convex mathematical programming and Newton-Raphson schemes. This latter scheme is shown to be linked to the former in the sense that it expresses the conditions under which the convex non-linear function can be minimised. A Taylor series expansion in time and space is extensively …
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Parallel multilevel procedures for elastoplasticity computations in solid mechanics
… element method. Specifically, an incremental Newton-Raphson procedure is used to linearize the nonlinear equilibrium equations. The multigrid method is then used to solve the linear matrix equations at each Newton-Raphson iteration step. This algorithm uses a relaxation method to quickly …
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A new REML (PX)EM algorithm for linear mixed models and factor analytic mixed models
… and factor analytic mixed models implement a Newton-Raphson type algorithm such as the expected information algorithm or the average information algorithm. There are two problems with these algorithms. Firstly, successive iterations of these algorithms are not guaranteed to increase the …
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A new REML (PX)EM algorithm for linear mixed models and factor analytic mixed models
… and factor analytic mixed models implement a Newton-Raphson type algorithm such as the expected information algorithm or the average information algorithm. There are two problems with these algorithms. Firstly, successive iterations of these algorithms are not guaranteed to increase the …
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Formulações e métodos de solução na análise não-linear de treliças espaciais
… carried out by several incremental procedures: Newton iteration type (Newton-Raphson and modified Newton-Raphson), conventional incremental, improved incremental, first-order self-correcting incremental, and some numerical integration techniques (fourth-order Runge-Kutta and Hamming's …
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Métodos iterativos de análise hidráulica e dimensionamento ótimo por programação linear de redes de distribuição de água
… distribution networks according to Hardy Cross, Newton-Raphson and Linear Analysis methods, is introduced firstly. The best computational performance method, in case, the Newton-Raphson with a nodal formulation is used into an economical optimization of water distribution networks, which is only …
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The development of a modular finite element program for analysis of soil-structure interaction
… the development of the program are discussed. Newton-Raphson iteration, and its application to finite element analysis is described. Methods for improving the convergence behavior of Newton-Raphson iteration are discussed. The methods include two global convergence algorithms: the line search …
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Formulations for incremental elastic-plastic analysis and the consolidation of porous media
… for the solution of the problem, mostly based on Newton-Raphson methods using an explicit scheme for the integration of the constitutive relations. The procedures in current use can be criticised in that they are essentially heuristic, and they are not fully linked to the governing mechanical …
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The direct determination of nonlinear displacements of arbitrarily supported shallow shells using mathematical programming techniques
… the variable metric method and the generalized Newton-Raphson procedure. A combination of the conjugate gradient method and the generalized Newton-Raphson procedure is found most suitable. Results of the present investigation are compared with published data for the buckling of a uniformly …
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Numerical solution of nonlinear algebraic systems in building energy modeling
When solving a system of nonlinear equations by Newton-Raphson's method, a common means of avoiding divergence requires each step to reduce some vector norm of the residual errors, usually the convenient and tractable sum of squares. Unfortunately, the descent requirement subjects the solver to …
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Rate of convergence in nonlinear programming
… used for nonlinear programming problems. The Newton-Raphson procedure and a higher order procedure used for the solution of nonlinear equations is studied. Both the convergence and the rate of convergence for the multivariate Newton-Raphson procedure is presented in the simple format of the …
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Computer-aided optimal design for laminar and turbulent fluid-thermal systems
The finite-element method and the Newton-Raphson method are combined to investigate the momentum-, mass-, and energy-conservation equations for strongly coupled flow problems. Then the design sensitivities of the system response are computed and used in a numerical optimization algorithm to …
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Finite element analysis of 3D electric machine problems
… we model the nonlinear problem using the Newton-Raphson method. We utilize cubic splines and relaxation factors to improve the convergence of the Newton-Raphson iteration.
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Signal and image processing for electrical resistance tomography
… versatile reconstruction algorithm based on the Newton-Raphson algorithm. The knowledge gained by implementing the algorithm is documented in this thesis. The literature covers the basic aspects of two-dimensional and three-dimensional ERT. It is hoped that this thesis will create a greater …
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Stabilized Finite Element Formulations for Flow Problems
… show for a number of example problems that the Newton-Raphson technique converges quadratically. For transient problems, we show that consistent Newton-Raphson approach does not converge in the vicinity of bifurcations such as the onset of unsteady vortex shedding. We also present a Schur's …
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Next-Generation Flash Memories Using Two-Dimensional Materials
… the numerical algorithm is based on the Newton-Raphson (NR) method. A comparative study is done on two different Floating Gate Transistor (FGT) based on the proposed model. Silicon dioxide (SiO₂) and Hafnium dioxide (HfO₂) are the two oxides explored as the top control oxide of the device.
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Geometrically nonlinear finite element analysis of space frames
… and limitations. An iterative approach, either Newton-Raphson iteration or modified Riks/Wempner iteration, is employed to trace the nonlinear equilibrium path. The latter can be used to perform postbuckling analysis.
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