Engineering Commons^™

Determination Of Q Factors And Operating Characteristics For Microwave Cavities And Oscillations, W.P. Stearns

Electrical and Computer Engineering ETDs

This paper has as its objective the presentation of the theory involved and method used with respect to the resonant cavity parameters; loaded Q, unloaded Q, external Q, pulling figure, and circuit efficiency for the resonant cavity investigated. Experimental data on a particular cavity are discussed and the previously mentioned cavity parameters determined with the use of such data and the particular method presented. A Rieke diagram for the particular cavity investigated is also presented and discussed.

Construction Of A Heavy Duty Military Airfield On Permafrost., Owen N. O'Leary

Civil Engineering ETDs

An examination of the map of the northern hemisphere will show that the two great population areas of opposing ideologies are located across the arctic regions from each other. This fact has been recognized by the U.S. military authorities since the early 1940’s, and an effort has been made to locate military forces in these regions to act as a possible deterrent to any aggressive action. The nature and geography of this region generally preclude any military forces except combat airfield. The most outstanding and possible only example of a major military airfield located entirely on permafrost material in these …

An Investigation Of Compressive Testing Of Concrete, Gilbert R. Williamson

Civil Engineering ETDs

The strength of most materials is affected by the rate of application of the load and concrete is no exception. However, the effect of a varying rate of loading on the compressive strength of concrete has not been too fully investigated. This effect is one of the problems covered in this paper. The first investigation along these lines was done in 1917 by Duff Abrams of the Structural Materials Research Laboratory, Lewis Institute, Chicago. In 1936, Paul G. Jones and F. E. Richart, working at the University of Illinois Engineering Experiment Station, reported the result of their experiments of the …

An Investigation Of The Response Of A Velocity Sensing Resonant Oscillator In An Inertially Operated Distance Meter, Howard F. Devaney

Electrical and Computer Engineering ETDs

It was the purpose of this study to investigate the response characteristics of a resonant mechanical oscillator utilized as a governor in conjunction with an inertial distance meter to sense velocity of a carrier. In order to initiate any desired event at a predetermined velocity of a vehicle (for example: fuel cut-off in a conventional liquid fuel rocket motor) it is often desirable to utilize a component requiring no external power for its operation. Such a component would be activated by inertial force and, by some means, integrate the force (or acceleration) with one respect to time and provide a …

A New Design Key Locked Insert And Automatic Key Installation Tool, Holt J. Gay

Mechanical Engineering ETDs

There has been an increasing need for a better steel insert or bushing between aluminum and steel bolts in the last few years with the rapid growth of the aircraft and missile industries. The steel insert or bushing threaded internally and externally, by increasing the area of contact with the aluminum raises the strength of the bolt fastening combination approximately 300 per cent or causes a 125,000 PSI bolt to fail rather than 40,000 PSI aluminum to fail. In addition, galling and seizing are practically eliminated. A bolt installed and removed just a few times in aluminum is likely to …

The Effect Of Dynamic Loading On The Stress-Strain Curve Of Foam Plastics, Carroll D. Beaman

Civil Engineering ETDs

No abstract provided.

The Rating Of A Power Type Transistor, Richard Lee Mann

Electrical and Computer Engineering ETDs

The purpose of this paper is to describe the test performed and present the results obtained in an attempt to establish the maximum permissible direct current and pulse ratings for the type of CTP-1003 (Clevite Transistor Products) power transistors under typical operating conditions. The manufacturer's specifications for the type of CTP-1003 power transistor are located in Appendix A.

The Dc Design Of Reliable Multistable Circuits, Richard H. Williams

Electrical and Computer Engineering ETDs

The reliability of a piece of equipment is a measure of its ability to function as intended. Equipment may malfunction in two different ways. It may fail catastrophically as a vacuum tube does when its heater opens; it may fail gradually as a vacuum tube does when its transconductance slowly falls to an unacceptable level over a period of time. It is not the intent of this paper to study catastrophic component failures, but rather to illustrate a technique whereby gradual failure of circuits can be minimized.

A Binary-To-Decimal Converter, Samuel D. Stearns

Electrical and Computer Engineering ETDs

This paper describes a device which electronically converts a binary number into its decimal equivalent. Such a device might be of use in digital computers, many of which use the binary number system, and also in similar machines, such as pulse code modulated data collectors.

The binary-to-decimal converter described here was designed specifically for use in Sandia Corporation's High-Speed Digital Recording and Data Handling System, which actually uses the Gray code rather than the binary number system. However, conversion from Gray to binary (see Appendix B) is simple, and a binary-to-decimal converter seems much simpler than a Gray-to-decimal converter.

The Design, Construction, And Testing Of A Centrifugal Compressor Installation, James V. Neely

Mechanical Engineering ETDs

The purpose of this investigation was to design and build the equipment necessary to couple a Dodge automobile engine to an Allison aircraft engine supercharger; to assemble and instrument this instillation in such a manner that performance characteristics of the single stage centrifugal compressor could be determined; and to present and evaluate the data obtained in terms of appropriate dimensionless parameters.

A Study Of The Variation Of The Fluoride Content Of Certain Waters In The Vicinity Of Albuquerque, E. Metz Beahm

Chemical and Biological Engineering ETDs

In the first part of 1935, the City of Albuquerque was investigating the possibility of obtaining an additional water supply from the Jemez Mountains, which are about fifty miles to the north of the City. Black and Veatch, consulting engineers for the City, were asked to make a complete study of the problem. The question of fluorides in the water came up because it was known that the fluorides would cause mottled enamel in human teeth when the water was used during childhood, if the content was above 0.9 parts per million by accepted fluorine analysis methods. The question arose …

Transistors Applied To An Fm-Fm Airborne Radio Telemetery System, R. H. Gablehouse

Electrical and Computer Engineering ETDs

The two semiconductor elements commonly used in transistor production, silicon and germanium, were discovered by two European chemists. A Swedish chemist, Jons Jakob Berzelius, separated and identified silicon in 1823. Germanium was discovered and named by a German chemist, Clemens Alexander Winkler in 1886.

A Technique For Obtaining Submicrosecond Exposure Times At Large Aperture In High-Speed Photography, Joseph A. Hull

Electrical and Computer Engineering ETDs

The purpose of the investigation described in this report was to attempt to improve one of the existing techniques, namely, the Kerr cell type electrooptical shutter, to make it more applicable to the study of high-explosive physics. To provide a background for the reader, a brief discussion of the other techniques will be described. Some of the advantages and limitations of these systems will be discussed.

The Variations Of Stress Induced In An Eccentrically Located Bolt Securing A Flanged Joint, Verne E. Blake Jr.

Mechanical Engineering ETDs

It is common practice in design work to use bolts as a means of attaching load carrying members. In many instances it is not possible to locate the bolt so the line of action of the external load will pass through the bolt axis. As a result, there are secondary loads, resulting from the eccentricity of the load paths, which the bolt must resist in addition to the primary loads.

Determination Of The Residual Vswr [Voltage Standing Wave Ratio] Of A Slotted Line., Michael C. Robel

Electrical and Computer Engineering ETDs

Idealistically, a slotted line should be designed so that, when it is terminated in its characteristic impedance, the VSWR as determined by a movable probe in the slotted line will be 1.0. However, in practice this is not possible, particularly in the case of coaxial slotted lines where matching elements, adapters and connectors are utilized. The devices mentioned above have physical discontinuities which give rise to reflections, which cause a standing wave to be produced even though the line is terminated I its characteristic impedance.

High Stability Lc Oscillator For Use With A Capacitive Pressure Sensing Element, Arthur J. Eldridge

Electrical and Computer Engineering ETDs

In the course of work at the Sandia Corporation, a definite need arose for the measurement of barometric pressures to an accuracy beyond that attainable with commercially available equipment. The standard instrument for measuring these pressures is the mercurial barometer. While a visual method of reading the instrument produced good results to within a 0.1 millimeter of mercury, it was dependent upon the operator using as a reference a target of sighting on the top of the meniscus formed in the barometer tube by the mercury.

Corona Threshold Of Single And Multiple Conductor Lines, David S. Carrick

Electrical and Computer Engineering ETDs

Corona is a self sustaining, often luminous discharge due to ionization adjacent to charged conductors, characterized by the electrodes having a small radius of curvature compared with the interelectrode gap. The display on a power transmission line is accompanied by a current between the conductors which to an engineer mean a power loss that should be minimized if unavoidable.

The Response Of Vibration Mounts Subjected To Biharmonic Vibration, Paul H. Adams

Mechanical Engineering ETDs

Existing specifications used in vibration testing are based on envelopes of many points of fixed frequency and vibration amplitude measured at specific points in aircraft. In addition these specifications are to some extent written to be compatible with the two common types of vibration test machines, the reaction or constant-displacement type and the electromagnetic or constant-acceleration type. Thus the "envelope" of the measured vibration amplitudes is drawn in such a manner as to have a constant displacement from 3 to 60 cycles per second, the range of the reaction type of vibration test machine, and a constant acceleration from 60 …

A Proposal For Two Computers Dealing With The Convolution Integral, Charles S. Williams Jr.

Electrical and Computer Engineering ETDs

The integral f(x) = g(x-y)h(Y)dy is known as a convolution integral. The first computer described herein will determine the function f when the functions g and h are known. The second computer will determine the function h when f and g are known; in using the second computer to find h, then the first computer is used for auxiliary computations.

A Study Of Servomechanism Damping Methods, Arthur J. Clark Jr.

Electrical and Computer Engineering ETDs

The purpose of this study is first to present a review of the general effects of damping, both Coulomb and Viscous, and feedback devices resulting in error rate damping: second to present detailed mathematical analyses of a number of special damping devices that may be used to advantage in servomechanism design.

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 …

A Study Of The Brittle Model Method Of Stress Analysis As Applied To Solid Circular Grooved Shafts Tested In Torsion, George V. Lemmon

Mechanical Engineering ETDs

It is the purpose of this study to (1) determine the applicability of the brittle model method of stress analysis to samples subjected to various stress raisers when tested in torsion and (2) to investigate the effects of grooved stress raisers in solid cylindrical members in tested torsion.

Crossover Networks For Loudspeakers, Edward A. Brown

Electrical and Computer Engineering ETDs

No abstract provided.

A Variational Approach To The Calculation Of Electron Trajectories, Edmund G. Franzak

Electrical and Computer Engineering ETDs

It is the object of the present work to derive, develop, and illustrate a method for the calculation of electron trajectories based on variational techniques and employing scalar and vector potential functions instead of the customary intensity functions. The methods of the calculus of variations furnish an extremely basic approach to the problem while lending an undeniable air of rigor and mathematical elegance.

Solution of the problem will be accomplished by first setting forth a mathematical structure upon which the work will be based, next outlining the physical principles governing the problem and finally applying the mathematical theory and physical …

An Analysis Of A Shunt-Peaked Video Amplifier And Feedback Pair Having The Same Edge Response, Bernard J. Regenauer

Electrical and Computer Engineering ETDs

Statement of the problem. It is the purpose of this study (1) to investigate the feasibility of employing a feedback pair instead of a shunt-peaked video amplifier in a typical circuit application; (2) to determine the steady-state gain ratio between a feedback pair and a single shunt-peaked video amplifier having the same edge response (rise time and overshoot) and to analyze the effect of varying either the rise time or overshoot of both circuits upon this ratio; (3) to make a limited study of the steady state gain ratio of a feedback pair and a cascade of two shunt-peaked video …

Prestressed Concrete Design For The Alameda Bridge, Louis Gonzaga Archuleta

Civil Engineering ETDs

No abstract provided.

A Mathematical And Experimental Investigation Of The Application Of Air Spring To Shock Testing Machines, Eric E. Ungar

Mechanical Engineering ETDs

The applications of many modern devices require them to be able to perform their functions satisfactorily after having been subjected to transient accelerations of considerable magnitude. Some Devices are required to operate even during the period of acceleration.

Since failure of components or sub-assemblies during the actual operation of the entire assembly would in general be extremely undesirable and costly (for example, failure of instrumentation in a high-speed aircraft or guided missile might lead to loss of the entire vehicle), it is necessary to test the components and sub-assemblies in order to determine whether they may be exposed to accelerations …

An Experimental And Theoretical Investigation Of The Characteristics Of A Magnetic Amplifier, Merle H. Wittmeyer

Electrical and Computer Engineering ETDs

Many excellent analyses of magnetic amplifiers have been published. As in every investigation, however, there are many details not explained. The purpose of this investigation was to explain some of the details of magnetic amplifier characteristics.

The Transient Response Of A Distributed Amplifier, Thomas D. Lusk

Electrical and Computer Engineering ETDs

The purpose of this paper is to describe the transient behavior of a simple constant-K distributed amplifier stage. The derivation of the transfer function is carried out using the Laplace Transform for the case where losses in the lines are considered to be zero. The various characteristics of the amplifier response to a unit step function are discussed and the effects of losses and other modifying factors upon the idealized response are evaluated. Finally design procedures are derived which allow the circuit designer to determine the circuit parameters necessary for good transient responses. These procedures are applied to the design …

Servo-Stabilization Of Drift In Wide-Band D-C Amplifiers., Joel M. Simmons Jr.

Electrical and Computer Engineering ETDs

It was the purpose of this study to determine the suitability of a comparator and negative feedback circuit (servo-type) as a general utility method of reducing the end effect (zero-drift) of changing static characteristics of the vacuum tubes and other associated components in wide-band direct-coupled amplifiers. A brief description of the drift servo-stabilization system and its drift reducing characteristics are as follows.