Electrical and Computer Engineering Commons^™

Determination Of Required Component Reliability From System Reliability Requirements, Arthur M. Breipohl

Electrical and Computer Engineering ETDs

No abstract provided.

Automatic Tuning Of A.C. Compensating Networks, Giles C. Sinkewiz

Masters Theses

"The purpose of this thesis is to illustrate the practicality of using an auxiliary servo system to shift parameters in damping networks of the main servo system.

Since amplification is most easily achieved with A.C. amplifiers and since A.C. servo motors are superior in operation to D.C. servo motors, because no brushes or commutators are needed, the A.C. servo system is widely used. However, one major problem is confronted when designing an A.C. servo system. This is the problem of designing damping circuits and compensating circuits which are insensitive to carrier frequency fluctuations. Notch filters provide the desired transfer functions, …

Analysis And Simulation Of A Cross-Correlation Communication System, Dennis Jay Gooding

Masters Theses

"Statement of the problem. The purpose of this study was (1) to calculate the probability of error as a function of receiver input signal-to-noise ratio for a typical communication system employing cross-correlation detection; (2) to design and construct an experimental model of such a communication system for the purposes of demonstrating the operation of the system and verifying the theoretical calculations"--Introduction, page 1.

A Method For The Prediction Of Detection Ranges For Pulsed Doppler Radar, Phillip Orlan Brown

Masters Theses

"Modern radar systems must provide greater detection ranges both against high and low altitude targets because of the significant advances in weapon speed and range. Extended range indicates that the power transmitted by the radar must be increased. It follows, that ground return becomes a problem even at high altitudes.

There are at present three basic types of radars which are (1) pulsed, (2) continuous wave, and (3) pulsed doppler radar. The conventional pulsed radar now closely approaches the theoretical optimum performance; however, it does not have the inherent ability to distinguish between ground return and moving targets. The continuous …

An Experimental Investigation Of Receiver System Sensitivity, James Henry Johnson

Masters Theses

"A method of determining the minimum detectable power density incident at the receiving antenna of a UHF receiver is proposed. The minimum detectable power density is the power density required to produce a signal-to-noise ratio of unity in the output of the receiver. The proposed method includes the receiving antenna impedance, the necessary connecting transmission lines, and the receiver impedance.

It is shown that an error in the antenna directivity will produce a significant error in the overall sensitivity of a receiving system. Since the directivity is the most difficult system variable to determine experimentally, it is probably the limiting …

Analysis And Synthesis Of A Current Regulator System, William P. Aiello

Electrical and Computer Engineering ETDs

This report describes a practical current regulator system used to accurately control the current delivered by a 500 kilowatt motor-generator unit. The generator supplies its current of 2000 amperes at 250 volts to a large water-cooled air-core solenoid used by LASL Group P-7 for experiments in connection with the Sherwood program.

After a general discussion of the system specifications and the basic regulator loop, each of the components in the basic regulator loop is described in considerable detail. The description, in most cases, is mathematical in nature although many circuit diagrams are included with brief descriptions when necessary for proper …

The Equalization And Optimization Of A Third-Order Type-1 Position Control System, Viswanatha Seshadri

Masters Theses

"While the practice of feedback control dates back to the day when the earliest living organisms began to react to their environmental conditions and the changes therein, it has been only during the past two decades that this technique came to be subjected to a scientific examination. Yet, an astoundingly rapid advancement has resulted in the field of servo-mechanisms, contributing substantially to the development of modern civilized existence and activity to its present standards, and promising to contribute, to an ever-increasing extent, to the accelerated progress of scientific and industrial enterprise in this space age.

The principal concerns of the …

Design Of An Intermediate Frequency Amplifier And Variable Frequency Oscillator, Robert Charles Mcintyre

Masters Theses

"Since the advent of the transistor in 1948 many technological barriers have been overcome in the field of semiconductors. Unfortunately, however, there is a considerable period of time between the discovery of a scientific phenomena and its widespread use and understanding by practicing engineers. The motivating factor which prompted this investigation was primarily the lack of knowledge which the author possessed concerning transistors. The selection of the amplifier and oscillator design confined the study primarily to the transistor. Considerable time, however, had to be spent in the study of basic transistor theory before any phase of the design could be …

A Theoretical And Experimental Analysis Of A Hall Generator, David L. Endsley

Electrical and Computer Engineering ETDs

This is a study of the behavior of a "Hall Effect" device by theoretical and experimental methods to determine if its operation may be predicated for various magnetic fields, output resistances, operating temperatures, input resistances, input control currents, and device construction.

This information should prove useful in the design of a circuit where the use of a "Hall Effect" device is contemplated.

A Reactor Transfer Function Analyzer, Earl O. Swickard Jr

Electrical and Computer Engineering ETDs

This thesis describes the design of a device for determining the transfer function of a nuclear reactor. A number of different methods have been successfully employed for this purpose but were, in some cases, tedious or required the use of delicately balanced components. The equipment described computes values which are simply related to the values of the transfer function and is operable over a frequency range of about 1000:1. The time required to obtain data for one frequency point is two minutes or less. No precise adjustment is necessary during operation.

Transient Response Of A Mass Mounted On A Nonlinear, Strain-Rate Sensitive Element, Wiley T. Holmes

Electrical and Computer Engineering ETDs

The object of the present transient movement study was not that of investigation of response of a nonlinear system alone, but was projected to include the effect of a strain-rate sensitive, nonlinear restoring element.

Transistor Distributed Amplifier, Bill J. Harper

Electrical and Computer Engineering ETDs

For the purpose of this report, it is assumed that the behavior of the transistor can be predicted from the study of a suitable circuit model or equivalent circuit of the transistor. It is further assumed that, except for the intrinsic short-circuit current gain, the circuit parameters of he transistor are independent of frequency and temperature. The primary interest in the study of transistor distributed amplifier here is the amplitude of the voltage gain in the amplification of video frequencies. Somewhat less detailed studies are made of the distributed amplifier in band-pass applications.

An Experimental Investigation Of A Small Volume Sandwich Antenna In The 400 Megacycle Frequency Range, James Gilbert Smith

Masters Theses

"Scope of the Investigation: The small volume sandwich antenna was patterned after that of F. D. Clapp's which appears in an unpublished report written for the United States Navy. Clapp's antenna is shown in Figure 2. The antenna described in this report was investigated at approximately one-thousandth of the volume of the original Clapp antenna. Clapp's antenna was designed for the 225-400 megacycle range; while the author's model was designed for operation at 400 megacycles.

The objective of this investigation was to build a small volume sandwich antenna which could be adapted to satisfy the characteristics listed on page 1. …

Design And Construction Of An Automatic Antenna Pattern Plotter And Design Of A Microwave Absorbent Material, Norval D. Wallace

Masters Theses

"The following study consisted of two problems. One was the design and construction of an automatic antenna pattern plotter, and the other was the design of a microwave absorbing material for use in a darkroom"--Introduction, page 1.

An Amplitude-Stable, Fixed-Frequency Transistorized Power Supply, Bobby O. Allen

Electrical and Computer Engineering ETDs

The subject of this paper is the design of an ultrastable, fixed- frequency power supply capable of maintaining a high degree of amplitude stability over a wide range of resistive load values. The requirement for such a power supply originally arose in connection with the design of a particular piece of test equipment required by Sandia Corporation. No attempt will be made in this paper to justify or explain the necessity for the specified design criteria outlined in the following paragraphs other than to adequately define the design criteria.

Frequency Response Of Rotating Servo Components, Yehuda Rachovitsky

Masters Theses

"The frequency response approach to the design of automatic controls is the dominant one today. This approach in a strict sense may be said to have started with a paper in 1932 by Dr. H. Nyquist, a physicist at the Bell Telephone Laboratories. In this paper Dr. Nyquist was concerned with the stability of feedback amplifiers. This work can be said to have made possible the transcontinental telephone as well as modern radio and television. Dr. Hendrick Bode, mathematician at the Bell Laboratory, extended the results of Dr. Nyquist and obtained some simple design criteria that enabled even technicians without …

Safe Thermal Operation Of Power Transistors Under Pulsed Excitation, George R. Swain

Electrical and Computer Engineering ETDs

One desires to find the relationship between thermal stability and such factors as temperature within the transistor, power dissipation in the transistor junctions, collector saturation current, and thermal resistance. In the approach set forth in this paper, the theory of solid state heat flow is applied to a simplified thermal model of a power transistor.

The Design, Construction And Testing Of An Electrical, Transient Heat Flow Analyser, Bruce Wilcox

Electrical and Computer Engineering ETDs

The purpose of this investigation was (a) to design and build an analog which would produce the solution to a simplified yet typical transient aerodynamic heating problem, (b) to obtain the solution using the analog and to check the accuracy of the solution by mathematical computation, and (c) to code a more involved aerodynamic analog.

Comparison Of Observed And Calculated Near-Vertical Radar Ground Return Intensities And Fading Spectra, James Arlin Cooper

Electrical and Computer Engineering ETDs

The study of ground-to-air terrain return is necessary in order to understand the functioning of radar altimeters.

Radar return at vertical incidence can be considered to be composed of two components. One, whic his returned by a mirror-like action, is called the specular component. The other, termed scatter, is due to diffuse rerediation from individual scatterers on the ground.

In recent work on return from angles near vertical, more attention has been given to the scatter component than many had previously assumed necessary.

Procedure for Gathering Data:

Two pulse radar units were used, one having a frequency of 3.8 KMC, …

Design Of An Experiment To Separate Specular And Scattered Radar Returns, Robert B. Glascock

Electrical and Computer Engineering ETDs

This paper describes the design of a radar experiment that will be conducted by the U.S. Naval Research Laboratory at Washington, D.C. The proposed experiment and the background of the problem are discussed, as well as the theoretical background, experimental background, and other design considerations are discussed in later sections.

A Study Of The Reset Cycle Of A Half-Wave Self-Saturable Magnetic Amplifier, William W. Lee

Electrical and Computer Engineering ETDs

It was the purpose of this study (1) to investigate the reset cycle of a half-wave self-saturable magnetic amplifier by graphical analysis of the irregular voltage functions appearing across the gate winding during reset; and (2) to determine if possible from this analysis a more satisfactory design method than those now available. Conditions of constant current reset were employed and the core material used had a nearly rectangular hysteresis loop. Resistive loads only are considered.

Utilization Of The Relationship Between The Complex Immittance And The Indicial Immittance Functions For The Synthesis Of Two Terminal Networks, Julian T. Lefler

Electrical and Computer Engineering ETDs

It was the purpose of this study (1) to develop a new method of network synthesis from a specified complex immittance function; and (2) to demonstrate the application of the method by means of its use in the solution of representative synthesis problems. This work deals only with the synthesis of two terminal networks containing linear, passive, lumped-constant elements, from given rational immittance functions of the complex frequency variable.

Not considered part of this work are (1) the development of the immittance function from frequency-response specifications (the approximation problem); or (2) the treatment of active, non-linear, or time varying network …

A Study Of A Complementary Symmetrical Power Switching Circuit, Glenn S. Mills

Electrical and Computer Engineering ETDs

This paper contains an analysis of a symmetrical, complementary, power switching circuit employing complementary power transistors. A DC analysis is made for the bistable states. Also described is a voltage regulation and bias circuit which improves stability and contributes to the protection of the transistors. The problem of switching transients is investigated and empirical results presented to support theoretical considerations. A new triggered method is proposed to utilize the bilateral characteristics of a transistor. Applications of the circuit are suggested for controlled-frequency and self-triggering modes of operation. A method and analysis for self-triggering is presented. The advantages of this power …

The Use Of Electrical Resistance Strain Elements In Three-Dimensional Stress Analysis, Robert I. Brasier

Electrical and Computer Engineering ETDs

The purpose of this thesis is to present a new method of experimental stress analysis and to give the solution to a problem which has been handled by this method.

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.

Transients And Saturation In Synchronous Machines, Sabi J. Asseo

Masters Theses

"The synchronous machine can be regarded as the most important electrical device in today's industry and civilization. Although many improvements in the development of powerful electronic devices have been made, in recent years, the importance of the electrical power engineering field can never be overlooked in any way.

Most of electrical power engineering problems have been studied in the first quarter of the present century, and the results applied to industry for the betterment of electrical power production. As distribution and transmission systems used become extensively large, new problems such as the stability of interconnected power systems, have been introduced. …

The Status Of Applied Electricity In Selected Colleges And Secondary Schools In Kansas, Karl E. Cunningham

Electronic Theses & Dissertations

This study was developed on the premise that applied electricity was a current and future need of such dimensions that it demanded more attention by educators. An attempt was made to determine the present status of teaching applied electricity in selected colleges and secondary schools in Kansas with a view to developing and/or improving programs in the area. Objective data were obtained by surveys of secondary school administrators, industrial arts supervisors, and instructors who taught applied electricity as a separate course or as a unit in a composite general shop. Additional information and statistics were derived from books, periodicals, published …

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 …

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.