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 97 for “"matrix method"”.
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Computer aided analyses of symmetrically loaded thin cylindrical shell using transfer matrix method
… thin cylindrical shell structures using transfer matrix method. A shell is a body bounded by a double curved surface, the thickness of the shell generally being smaller than its radius. A shell is classified thin if the ratio of the thickness to radius is less than twenty. The analyses of the …
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Numerical Treatment of Schrödinger’s Equation for One-Particle and Two-Particle Systems Using Matrix Method
… developed and tested here using linear algebraic matrix methods to enable precise solutions.</p> <p>The finite-difference technique is used to cast the Time-Independent Schrödinger equation (TISE) in the form of a matrix eigenvalue problem. The numerical singularity in the Coulomb potential term …
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Interpretation of shear wave birefringence in P to S converted waves data using the propagator matrix method
We present an original method for estimating local shear wave birefringence properties for 3D surface P to S converted waves. To accomplish this we approach the problem using reverse VSP (RVSP). The method works in the pre-stack domain and uses the P waves converted to S as shear wave sources. We …
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Integrating matrix method for determining the natural vibrations of a rotating, unsymmetrical beam with application to twisted propeller blades
A numerical method is presented for determining the natural vibration frequencies, and the corresponding mode shapes, of a rotating cantilever beam which has a nonuniform, unsymmetrical cross section. Two coupled fourth-order differential equations of motion with variable coefficients are derived …
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Concurrent process mapping, organizations, project and knowledge management in large-scale product development projects using the Design Structure Matrix method
… performed all at once using the Design Structure Matrix (DSM) Method, enabling large and relatively easy improvements of the design activity's efficiency. The state-of-the-art in each of the four mentioned fields is first reviewed. The methodology used throughout this thesis, the Design Structure …
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Calculation of Electron Collision Cross Sections in Fluorinated Nitrile (C4F7N) and its Dissociation Fragments
… sections, this report concerns the use of the R-matrix method solver Quantemol-EC. This software uses the sophisticated UKRmol+ codes to solve the electron-molecule scattering problem at low to moderate energies (0.01 - 20 eV) and produce elastic, vibrational, electronic excitation, and …
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Development of a [i.e. an] engineering design procedure for a complex revolute joint
… developed that combine both the finite element method and the transfer matrix method in design. These procedures were drawn up as a result of the analysis of a large continuous mining machine to be produced by Fairchild International. Combining the methods allowed the analysis to be split into …
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Vibration suppression in finite length marine cable systems
… vibration absorber is studied. The transfer matrix method is used to build various numerical models of vibration absorbers in marine cable systems. The models determine cable system natural frequencies, mode shapes and modal damping ratios. The introduction of absorber damping is shown to …
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Analysis and design of control systems by means of time domain matrices
The aim of this dissertation is to present a new method of engineering analysis and design for complex control systems. This method is the time domain infinite matrix method. The formulation of the infinite matrix follows from the convolution summation of sampled data systems The mathematical basis …
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Structural modification utilizing beam elements
… combines the Dual Modal Space Modification Method (DMSM) and the Transfer-Matrix Method to institute general beam modifications. The DMSM method is employed to implement the beamtype modification, while the transfer-matrix method is used to formulate the modification element. The use of …
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Influence of active magnetic bearing sensor location on the calculated critical speeds of turbomachinery
… design has created the need for a more accurate method for predicting the system's undamped critical speeds. This thesis documents the development of a method which improves the accuracy of critical speed calculation by properly accounting for the influence of AMB sensor location on the undamped …
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COMPARISON ON DIFFERENT DISCRETE FRACTIONAL FOURIER TRANSFORM (DFRFT) APPROACHES
… signals in the Fourier transform domain, several methods of extraction and parameter estimation for chirp signals are proposed, and a comparative study has been done on chirp signal estimation. Computation of the discrete fractional Fourier transform (DFRFT) and its chirp concentration properties …
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Crashworthiness optimization of ultralight metal structures
… the use of the dynamic stiffness and transfer matrix methods in marine riser vibration. Marine risers possess a predominant chain topology. The transfer matrix method is appropriate for the analysis of such structures. Wave transmission and reflection matrices are formulated in terms of …
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Design variables for steel and aluminium in high-rise rooftops
… solutions using novel aerospace materials and methods • Prediction of future performance through factorial and matrix method approaches. Outcomes: • It is hoped that the text provides a documentary basis for future guidance of designers and engineers working in areas related to the subject of …
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Análise estática de placas pelo método combinado elementos finitos - matriz de transferência
… deals with the combined finite element-transfer matrix method. The main advantage of this method is to reduce the size of matrices envolved in the analysis which is useful in microcomputers with little RAM memory. Herein this method is used for static analysis of isotropic retangular plates with …
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Extraction of eigen-pairs from beam structures using an exact element based on a continuum formulation and the finite element method
Studies of numerical methods to decouple structure and fluid interaction have reported the need for more precise approximations of higher structure eigenvalues and eigenvectors than are currently available from standard finite elements. The purpose of this study is to investigate hybrid finite …
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Spinabhängige Asymmetriefunktionen in der elastischen und inelastischen Elektron-Cäsium-Streuung bei mittleren Energien
… which use either the relativistic R matrix method, or the convergent close-coupling method.
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Searching For New Physics In The B-Quark’s And Higgs’ Sectors Via Kinematic And Angular Distributions
… in the Higgs’ couplings. The density matrix method and helicity formalism technique are employed for deriving these distributions.
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Radiative properties of silicon related materials
… FLIR camera and a Laser Grip -Model 1022. A matrix method based approach is implemented to simulate the optical properties.
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