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Effect Of Air On Vibration Of Structures, Tong Xia

Civil Engineering ETDs

This research primarily studies the effect of air on vibration of structures. Theoretical solutions based on various physics are derived and compared with experimental results to determine how air modifies the vibrational behavior of structures. This work may help in determining the characteristics of structural vibrations — from acoustic behavior to earthquake response - in practical buildings. The work consists of several primary components: derivation of theories that predict the effect of air on structural vibrations and vice-versa, design of experiments, and determination of the importance of air in structural vibrations and the applicability of different physics under various vibrational …

Some Design Criteria For Open-Ended Microwave Cavities, Richard O. Gilmer

Electrical and Computer Engineering ETDs

Primarily this paper describes the electromagnetic problems involved in determining a proper waveguide size for the ^TE11N cavity and its terminations. Also, one chapter is devoted to construction techniques used in the construction of open-ended sampling cavities. The approach one may use for aerodynamic improvements of the cavities is discussed, but no conclusions can be drawn about the design's validity since no experimental tests were taken.

This paper will describe the design, construction, and testing of a microwave cavity, the end plates which are replaced by terminations which allow up to 93% of the cross-sectional area of the terminations …

A Shock Tube For Transonic And Supersonic Aerodynamic Research, John Hopkins Atkinson

Mechanical Engineering ETDs

The purpose of building a shock tube was to give the University another research tool and demonstration instrument for aerodynamic studies since the present wind tunnel is not suitable for high velocity research. It was hoped that the shock tube might, when calibrated against theoretical flow data, prove suitable as a test facility. Te determine its usefulness as such a facility it was necessary to devise a method for measuring local velocities, investigate size effects of models in the flow and provide a check against standard wind tunnel data. The shock tube was to be built as simply and cheaply …