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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 43 for “"Newton-Raphson method"”.
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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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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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Aplicação do M.E.F. na análise do colapso de tubulações submarinas para águas profundas
… on their analysis and design. The Finite Element Method (F.E.M.) is considered in these developments, where the pipeline is discretized using nonlinear isoparametric shell elements, which accounts for geometric and material nonlinearities. Plastification across the thickness is represented by …
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Digital load flow analysis using general matrix storage and non-zero element storage
… techniques. The basic solution used was the Newton Raphson method. The two methods used to solve for the corrections to the bus voltages are general matrix storage and nonzero element storage. In the general matrix all matrices are used with every element represented. In the non-zero routine, …
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Nonlinear analysis of cable structures
… for the displacement-based finite element method are derived in both the Total Lagrangian and Updated Lagrangian form. The Updated Lagrangian equations are then specialized for the analysis of three-dimensional cable structures. Two node and three node isoparametric finite elements are …
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The effects of earthquake excitations on reticulated domes
… The nonlinear solution technique is the Newton-Raphson method while the direct integration technique is the Newmark- Beta method. The joint displacements for the static and the dynamic analyses were compared for both domes along with the axial stresses in all members. The percentage …
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Comparison of Power Flow Algorithms for inclusion in On-line Power Systems Operation Tools
… that "automatically alternates" numerical methods including Newton-Raphson method, Gauss-Seidel method and Gauss method for a load flow run to achieve less run time. Unlike the proposed method, the traditional load flow analysis uses only one numerical method at a time. This adaptive …
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Towards efficient nonlinear option pricing
… and a multi-asset case. The chosen research methodology is the numerical PDE approach which essentially is to solve the nonlinear Black-Scholes equations with the relevant nonlinear volatility functions. The emphasis is on obtaining the numerical solution with reasonable accuracy and using …
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Método de decomposição de domínios de múltiplos passos de tempo de Dirichlet-Neumann aplicado à injeção de polímeros em meios porosos
… mechanical retention kinetics, and non-Newtonian pseudoplastic behavior. For the computational model, we propose a space-time domain decomposition method based on a predictor-corrector strategy. The resulting system of equations is discretized by the finite element method and linearized …
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Simulation of Batch Thickening Phenomenon for Young Sediments
… run of MATLAB program. The study also proposes a method to calculate the batch curve by considering the variation of solids concentration in the suspension region. Instead of the graphical approach available in the literature, the program uses numerical approach (Newton-Raphson method) to …
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Stress analysis of rocket motors with viscoelastic propellant by a mixed finite element model
… that can be approximated independently. The method of static condensation is used to keep some stresses across interfaces of a solid of revolution discontinuous. The stiffness matrix is transformed from semi-positive definite to positive definite. A rocket motor is composed of (1) case (2) …
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STATISTICAL MODELS UTILIZING DEPENDENCE BETWEEN VARIABLES
… was established based on the profile likelihood method, but they were not able to find the right conditions to guarantee the convergence of the algorithm. Divergence was not encountered in the real data analysis and simulation study. The logistic regression model is one of the popular statistical …
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Interação solo-estaca de plataformas offshore
… to undrained shear strength ratio. The Winkler method usually works out well, for a close Winkler spring distribution. However a deep water Offshore Fixed Platform-foundation analysis by the Winkler solution, excessively increases the number of degrees of freedom. Applying Galerkin Techniques a …
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Structural Optimization Using Geometric Programming and the Integrated Formulation
… programming problem. In contrast to current methods of optimization where analysis and design are separated into two distinct phases, the integrated approach does not distinguish between the two activities. Because of the large size of the resulting problem, solution by the currently …
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An incremental total Lagrangian formulation for general anisotropic shell-type structures
… An iterative solution procedure, either Newton-Raphson method or modified Riks/Wempner method, is employed to trace the nonlinear equilibrium path. The latter is also used to perform post-buckling analysis. A variety of numerical examples are presented to demonstrate the validity and …
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Modelling of the binary alloy solidification process
… point of an element. A fully consistent Newton-Raphson method is used to solve the global coupled equations and an Euler backward difference scheme is used for the temporal discretization. The solution of the enthalpy-temperature relationship is carried out at the integration points using …
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Application of the time-domain finite-element method to analysis of 3D electric machine problems
… work is to apply the time-domain finite-element method (TDFEM) to the simulation of 3D electric machine problems. The features of the problems might include low-frequency excitation, high inhomogeneity in the material parameters, complex geometries and nonlinearity in the materials. The proposed …
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Robust estimation, regression and ranking with applications in portfolio optimization
Classical methods of maximum likelihood and least squares rely a great deal on the correctness of the model assumptions. Since these assumptions are only approximations of reality, many robust statistical methods have been developed to produce estimators that are robust against the deviation from …
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Non-linear finite element analysis of reinforced concrete panels and infilled frames under monotonic and cyclic loading. Structures under plane stress loading are analysed up to and beyond the peak load. Non-linear material properties including cracking, crushing and the non-linear behaviour at the interface of members are considered.
… techniques use the standard and modified Newton-Raphson method or the secant Newton method. An automatic load incrementation scheme, line searches, and restart facilities are included. The capabilities of the program have been examined and demonstrated by analysing five reinforced concrete …
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