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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

On the stabilization and related problems of beams

Liu, Chao, 劉超 January 2005 (has links)
published_or_final_version / Mathematics / Doctoral / Doctor of Philosophy
2

Free vibrations of curved box girders.

Tabba, Mohammad Myassar. January 1972 (has links)
No description available.
3

Free vibration of a beam subjected to a large static deflection

Cornil, Marie-Blanche 12 1900 (has links)
No description available.
4

Thermal vibrations of beams and plates with temperature-dependent properties

Wahyono, Agus Hari. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1984. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 106-108).
5

Nonlinear vibration of a cantilever beam /

Delgado-Velázquez, Iván. January 2007 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 2007. / Typescript. Includes bibliographical references (leaves 67-68).
6

Free vibrations of curved box girders.

Tabba, Mohammad Myassar. January 1972 (has links)
No description available.
7

Comparison of approximate and exact methods for determining the frequencies of vibrating beams

Stirling, Yates III 16 February 2010 (has links)
The classical method, required for its solution, the application of boundary conditions to the solution of the beam equation. Except for the case cf the beam with one concentrated load at the center, it was not considered a practical solution. The transcendental equation obtained in the solution of the unsymmetrical case, considered in part B, was found too cumbersome to handle. It was not attempted in parts C and D. The Rayleigh Method proved to be a simple, accurate and reasonably rapid method for all cases considered. The Dunkerley Equation gave very satisfactory results for parts A, B, and C. It was rapid to use, accurate and in most cases the data could be found in prepared tabulations. Results were inaccurate for the two span beam, indicating the necessity for caution in its application to multi-span beams. The Ritz Method, which is a refinement of the Rayleigh Method, proved to be exceedingly accurate when applied to the beam with the single concentrated load. However, it was found, that as the number of terms in the assumed deflection equation increased, the work became more time consuming. It was used only in parts A and B. The Influence Coefficient Method and the application of D'Alembert's Principle, which methods are quite similar, proved to be simple, accurate, and rapid. However, as the number of degrees of freedom increased, the degree of the algebraic equation increased, which complicated the solution. The Iteration Method is probably the method to be used if the number of degrees of freedom exceeds three. As the number of modes increases the number of iterations would increase, but the individual operations in themselves would remain simple. This method proved simple and accurate to use. For the cases considered, it was more time consuming to use than either the Influence Coefficient Method or the application of D'Alembert's Principle. However, for higher degree situations, it should prove to be a more practical method. / Master of Science
8

Active control of flexural power flow in elastic thin beams

Gonidou, Luc-Olivier 05 September 2009 (has links)
Active control of flexural power flow in infinite, semi-infinite and finite beams by point force inputs has been analytically and experimentally studied. The systems were analyzed by assuming wave solution and then applying various terminating boundary conditions. Optimal control solutions were then obtained using a quadratic Wiener solution. The influence of system parameters such as discontinuity impedance and effects such as near fields, number and location of control actuators and error sensors is investigated and discussed. The mechanisms by which control is achieved are considered. It is demonstrated that the boundary conditions and the system configuration strongly influence the choice of optimal controller format. The experimental work is compared with the theoretical developments and found to be in good agreement. Control was achieved by a LMS Filtered-x algorithm implemented in assembler language on a TMS32020 digital signal processing chip. In general it is demonstrated that the flexural power flow in the beam types considered can be attenuated with a low number of active actuators. / Master of Science
9

The influence of secondary effects on beams on elastic foundations and vibrating beams

Blottner, Frederick Gwynn 01 August 2012 (has links)
The purpose of this thesis has been to investigate the influence of secondary effects for beams resting on elastic foundations and vibrating beams. Two problems have been presented for beams on elastic foundations and a general comparison has been made for an infinite vibrating beam. / Master of Science
10

Free vibrations of a vierendeel girder

Cunniff, Patrick Francis 01 August 2012 (has links)
As a suggestion for further work in deriving the equations by the Principle of Virtual Displacements, it might be advisable to write the equations based on the vertical displacements of the points of inflection of each column. The concentrated mass of each panel would be located at the center of the respective columns. This appears to be a better approximation than concentrating each mass at the lower joint. / Master of Science

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