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 “"transfer matrix"”.
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Dynamic stiffness and transfer matrix analysis of marine riser vibration
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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Transfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling system
This research develops transfer matrix model for the longitudinal vibratory component of a rotary-vibratory drilling (RVD) system driven with an electrohydraulic inertial mass exciter. The RVD system is a hybrid drilling system consisting of a conventional rotary drilling system assisted by forced …
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Modelling the sound insulation of corrugated roof structures : an extended transfer matrix approach
Over the course of this work, the transfer matrix method (TMM) was implemented and studied for its potential in predicting the sound insulation characteristics of corrugated dual leaf roof structures. A model of periodically connected plates, using Fourier expansions, was derived independently and …
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Computer aided analyses of symmetrically loaded thin cylindrical shell using transfer matrix method
… loaded 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 …
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Corner Transfer Matrix approach to the Yang-Lee Singularity in the 2D Ising Model
… the main numerical technique used: the Corner Transfer Matrix Renormalisation Group (CTMRG) method. The Ising susceptibility data obtained in \cite{orrick2001susceptibility,chan2011ising} plays a critical role in providing numerical evidence for the extended logarithmic operators proposed in …
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Corner Transfer Matrix approach to the Yang-Lee Singularity in the 2D Ising Model
… the main numerical technique used: the Corner Transfer Matrix Renormalisation Group (CTMRG) method. The Ising susceptibility data obtained in \cite{orrick2001susceptibility,chan2011ising} plays a critical role in providing numerical evidence for the extended logarithmic operators proposed in …
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Entropy functions and rare events in disordered systems by transfer matrix calculations and Monte Carlo sampling
This thesis treats problems from bioinformatics with Monte Carlo methods from statistical physics. Methods to compare molecular sequences (sequence alignment) make use of statistical tests to assess the significance of observed similarities. Distributions of optimal alignment scores over random …
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A Transfer Matrix Approach to Studying the Entanglement Complexity of Self-Avoiding Polygons in Lattice Tubes
… tubular sublattice of the simple cubic lattice. Transfer matrix methods are applied to examine the entanglement complexity of SAPs in lattice tubes. Transfer matrices are generated for small tube sizes, and exact enumeration of knotting distributions are obtained for small SAP sizes. Also, a …
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The development of a dynamically coupled axial-torsional-lateral point transfer matrix for a whirling eccentric mass
A point transfer matrix for a whirling eccentric mass was developed. Two right handed cartesian coordinate systems, a fixed and a rotating, were used in the derivation. The state variables and the elliptical whirl orbit were described relative to the fixed coordinate system. The rotating coordinate …
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Crashworthiness optimization of ultralight metal structures
… extends 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 …
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Vibration suppression in finite length marine cable systems
… marine cable 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 …
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An analytical study and computer analysis of three-dimensional, steady-state vibration of multishaft geared-rotor systems
A unique multifrequencied transfer matrix method performs three-dimensional harmonic, steady-state response calculations on geared-rotor systems. The full six degrees-of-freedom method includes physical branching to accommodate multiple shafting and frequency branching to simultaneously accommodate …
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Structural modification utilizing beam elements
… 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 transfer-matrix methods …
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Development of a [i.e. an] engineering design procedure for a complex revolute joint
… 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 smaller jobs. …
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Study of the effect of sensor position on the forced response characteristics of rotors with active magnetic bearings
… research presents a modification of existing transfer matrix methods for rotor analysis, to predict the response of rotor systems with active magnetic bearings. The position of the magnetic bearing sensors is taken into account and the effect of changing sensor position on the vibrational …
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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
… formulation is based on a converted continuum transfer matrix and is incorporated into a typical finite element program for eigenvalue/vector problems. Hybrid models using the exact-beam element generate transcendental, nonlinear eigenvalue problems. An eigenvalue extraction technique for this …
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Computer-Aided Design Software for Torsional Analysis
… Torsion 1, has been created. This torsional transfer matrix program provides the user with the ability to easily model multi-rotor systems using a simple user-interface. The program is capable of modeling such components or system characteristics as continuously distributed mass, viscous and …
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Influence of active magnetic bearing sensor location on the calculated critical speeds of turbomachinery
… rotor system. A more accurate solution using a transfer matrix method modified to account for AMB sensor locations is presented. The results from the transfer matrix method for an example compressor are presented showing the influence of the sensor placement on a standard undamped critical speed …
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The effect of physical molecular features on complex coacervation phase separation
… My work has led to the development of a transfer matrix theory that captures how molecular features affect complex coacervation in the high charge density limit. This theoretical approach maps the 3-dimensional system to a 1-dimensional adsorption model, and solves this 1-dimensional …
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Infinite Sets of Conserved Charges and Duality in Quantum Field Theory
… chapter II I discuss the connection given by the transfer matrix formulation between a classical statistical mechanical system and an associated quantum Hamiltonian, using as an example the familiar two- 4 dimensional Ising model. Next, in chapter III, I show how this applies to Baxter's 8-vertex …
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