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 1180 for “"vibrations"”.
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Research into building vibrations
… for vehicle or railway traffic can create vibrations that travel to nearby buildings. These vibrations can cause structural damage or human discomfort. Displacement time histories collected from buildings abutting the central surface artery were used to drive mathematical models so that …
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Structural vibrations in acoustic fields
Theoretical studies are described on the response of certain structures to acoustic waves. The most general problem treated is the response of a long cylindrical shell periodically stiffened both longitudinally and circumferentially when excited by obliquely incident plane sound waves. Numerical …
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Vibrations for improving multiphase contact
Present work demonstrates the use of vibrations to enhance performance of two multi-phase contacting systems: a bubble column for gas-liquid contacting (physical absorption) and a Piston Oscillating Monolith Reactor (POMR) for gas-liquid-solid contacting (catalytic reactions). In a bubble column …
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Vibrations in elemental amorphous semiconductors
In this thesis calculations of the vibrational spectra appropriate to structural models of the elemental amorphous semiconductors a-Ge, a-As and a-Se are presented. Simple dynamical models, involving restoring forces for bond length and angle variations only, provide information on the …
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Free vibrations of inflatable dams
… work deals with the linear two-dimensional free vibrations of an inflated cylindrical membrane. An air-inflated membrane is considered first. Vibration frequencies and modes are determined for various cases. The lowest mode shape is anti-symmetric. In the rest of the work, the membrane is …
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Techniques for Controlling Structural Vibrations
… tackle the problem of suppressing high-amplitude vibrations of cantilever beams when subjected to either primary external or principal parametric resonances. Guided by results of previous investigations into the nonlinear dynamics of single- and multi-degree-of-freedom structures, we design …
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Nonlinear Control of Plate Vibrations
… active vibration absorber to control the vibrations of plates is investigated. The absorber is based on the saturation phenomenon associated with dynamical systems with quadratic nonlinearities and a two-to-one internal resonance. The technique is implemented by coupling a second-order …
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Frictional vibrations in structural polymers
This study investigated the dry sliding of Acrylonitrile Butadiene Styrene (ABS) in a polymer-on-polymer configuration. The effect of several material and system parameters were investigated to determine their influence on the frictional behavior of the ABS materials. These parameters included: the …
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Active control of floor vibrations
The active control of structures is a diverse field of study, with new applications being developed continually. One structural system, which is often not considered a dynamic system, is the floor of a building. In many cases the dynamics of a floor system are neglected in the design phase of a …
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Structural damage detection using ambient vibrations
The objective of this research is to use structure ambient random vibration response to detect damage level and location. The use of ambient vibration is advantageous because excitation is caused by service conditions such as normal vehicle traffic on a highway bridge, train passage on a railroad …
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Nonlinear vibrations of long slender beams
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1983.
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Destruction of bacteria by ultrasonic vibrations
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering, 1951.
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Harvesting energy from non-ideal vibrations
… and household environments where low-level vibrations are commonly found. While significant progress has been made in making vibration harvesters more efficient, most designs are still based on a single constant vibration frequency. However, most vibration sources do not have a constant …
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Control of human induced floor vibrations
… is focused on the control of human induced floor vibrations. In order to provide the reader with practical insight on the subject, a case study of an existing steel framed office building that experienced excessive and annoying floor vibrations will be discussed and analyzed.
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Natural vibrations of beam-like trusses
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985.
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