No description available.

The vortex-induced oscillation of a circular cylinder is modelled by a non-linear system with two degrees of freedom. The periodic lift acting on the cylinder due to the vortex-street wake is represented by a self-excited oscillator, which is coupled to the cylinder motion. Approximate solutions and stability criteria are presented which are valid over restricted intervals. Changes to the form of the coupled-oscillator model and its approximate solution are examined in order to improve the comparison between predicted model and experimental results. The changes are motivated by the study of experimental evidence, and by comparison with the known properties of similar systems of non-linear equations. Significant improvement in the coupled-oscillator model performance is obtained through the inclusion of an effective structural damping term which is dependent on wind speed and cylinder displacement. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

No description available.

Honors project (B.S.) -- Carson-Newman College, 2009. / Project advisor: Dr. Sean Cordry. Includes bibliographical references (p. 27).

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2006. / Title from title screen (site viewed on August 11, 2006). PDF text of dissertation: xiii, 168 p. : ill. ; 3.46Mb. UNI publication number: AAT 3208091. Includes bibliographical references. Also available in microfilm, microfiche and paper format.

The general expressions for finding the network functions, e.g., the immittance and the scattering parameters, of a general, uniformly coupled n-line structure in an inhomogeneous medium are derived in terms of the normal mode parameters of the system. These are used to compute or to derive the explicit expressions for the elements of the immittance matrix in terms of normal mode parameters. The scattering parameters of a general non-symmetrical directional coupler with arbitrary terminations are derived in terms of the known scattering parameters with a specified set of terminations such as characteristic non-mode converting terminations. The formulation is quite general and can be applied to various coupled guided wave systems, including coupled microstrip lines, slot lines, comb lines, dielectric waveguides and various other uniformly coupled transmission systems. The results obtained are used to present the procedure to determine the optimum terminations for directional couplers and sensitivity of various multiports, including couplers, to changes in terminations. It is shown that the coupler performance can be optimized in terms of the terminating impedances. The analysis and design procedure for both symmetrical and nonsymmetrical four-port coupled structures consisting of the symmetrical three lines in an inhomogeneous medium such as microstrips are presented. Tables and charts for the design of three-line structure are based on the closed form expressions for the immittance parameters. The analysis and design procedure for open-circuited interdigital multiple coupled microstrip line structures for applications as wideband DC blocks and filters are also presented. As in the case of the other microstrip structures, the initial design is based on the TEM assumption and the final geometry is then determined by the exact computation of the frequency response of the two ports. For larger numbers of lines, the design is based on the equivalent even- and odd-mode parameters of the n-line system. For this case, the TEM design equations, derived in terms of even- and odd-mode impedances of a pair of lines, can be translated into a physical configuration by using published results on coupled lines. / Graduation date: 1983

No description available.

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering. / Microfiche copy available in Archives and Engineering. / Bibliography: leaves 135-137. / by Jacques F. Risser. / M.S.

Allan J. Lichtenberg. / "October, 6, 1954." "This report is based on a thesis submitted to the Department of Electrical Engineering, M.I.T., ... for the degree of Master of Science." / Bibliography: p. 27. / Army Signal Corps Contract DA36-039 sc-42607 Project 132B Dept. of the Army Project 3-99-12-022

Using Long-Period Fiber Gratings as component of Gain-Flattening filter ofOptical Amplifier, and discuss spectrum of different struture of Long-Period Fiber Gratings. To investigate the spectra characteristics of Long-Period fiber Gratings for designing reference resources. Aiming at different Gain-Flattening filter uses different struture of fiber grating, and the decision of parameter of fiber grating using Genetic Algorithm. Finally delcaring the dataflow of designing filter using Long-Period Fiber Grating and conclusion.In this paper , gain flatttening Cr:YAG optical amplifier spectrum and Erbium-doped optical amplifier spectrum,one achieve 300nm bandwidth and another achieve 40nm.