Engineering Commons^™

Compensator Design For Unity Feedback Systems On The Digital Computer., Ping Liang

Masters Theses

"In control systems engineering it is frequently necessary to compensate a fixed plant whose transfer function cannot be changed. Usually the characteristics of the resulting system are established in terms of steady state and transient performance specifications. Generally it is necessary to insert a compensator which permits the system to satisfy the specifications as well as to provide an absolutely stable system.

In this thesis a method is developed to determine the transfer function of the compensator. Each system performance specification can be expressed in a differentiable inequality form composed of the system closed-loop gain, zeros, and poles. First, the …

Linear System Transfer Function Identification, Tuh-Kai Koo

Masters Theses

“An approach using a high speed special purpose digital computer to identify the transfer function of a linear system is presented in this thesis. The data for computation are obtained by measuring the system response and its derivatives periodically with a periodic test signal (impulse) input.

The order of the system is first determined by evaluating the rank of a Hankel matrix. Then, the transfer function is determined by solving two sets of system equations.

Theoretical analysis is emphasized in the study. Two examples are given for the purpose of illustrating the theory

Small Signal Gain Analysis For A Seven Cavity Klystron Amplifier., William E. Hord

Masters Theses

"The problem was to find a suitable method of using the digital computer to calculate the small signal gain characteristics of a seven cavity klystron amplifier. Background material relevant to the problem was reviewed. The differential equations for small signal conditions in a gridless gap klystron were developed. These equations were then solved and put in a matrix form suitable for digital computer analysis. Suggestions for additional development were proposed"--Abstract p. ii

Convective Heat Transfer In Small Enclosed Air Spaces., Joseph Charles Kroutil

Masters Theses

No abstract provided.

Pattern Calculations On A Loaded Spiral Antenna., Jose Briceno

Masters Theses

"The purpose of this thesis is to calculate and p lot the radiation patterns o f a ferrotron-loaded spiral antenna made of semicircles. In particular, this work is confined to a balanced spiral free to radiate in all directions.

The current distribution used in the evaluation of the vector potential is taken from a synthesized current obtained from experimental information on a ferrotron-loaded spiral antenna at a frequency of operation of 200 MC.

The calculated patterns of the spiral antenna are in general single lobed in a direction perpendicular to the plane of the antenna. The beamwidth varies from 62° …

Infrared Modulation Using The Field-Effect Properties Of Germanium., Lloyd E. Brunkhorst

Masters Theses

"The absorption of infrared radiation, by free carriers in germanium, has been used to amplitude modulate infrared radiation. In the experiment, a space charge layer consisting of free carriers is established at the inner surface of a germanium sample by using the field-effect technique. Infrared radiation of a wavelength to which the germanium is transparent is then Internally reflected from this surface. The infrared radiation passes twice through the space charge layer for each internal reflection. With each pass through the space charge layer, the amplitude of the transmitted infrared is decreased. Amplitude modulation of the transmitted infrared is accomplished …

Some Effects Of Impact Of Low Magnitude On The Deformation Of Prestressed Gypsum Cylinders., Arthur Joe Bush

Masters Theses

"A review of the literature pertaining to the subject is presented. Many series or impacts were made on specimens of gypsum which were already under a static load. A special. repetitive impact machine was used to allow a variety or weights to fall from predetermined heights. Tests were conducted inside a roan constructed especially for these tests. Heat gained or lost through the ceiling and walls was kept at a minilI1um by a lining or aluminum-covered, fiber glass insulation. Temperature and humidity conditions were kept nearly constant by a combination air-conditioner and dehumidifier.

Repetitive loading of the prestressed specimen was …

The Justification For And Design Of A Lunar Radio Observatory., Thomas Van Doren

Masters Theses

"The purpose of a radio telescope is to record information concerning the strength, spectrum, polarization, and direction of arrival of extraterrestrial electromagnetic radiation at radio frequencies. Earthly based radio observatories are hampered in their attempt to achieve this purpose by atmospheric absorption and reflection of the radiation. A lunar based system would not have this problem because the Moon possesses practically no atmosphere. However, other environmental conditions, such as micrometeorites, high frequency radiation, and extreme temperature variations, must be overcome. This thesis justifies the need for a lunar radio observatory and also describes a particular radio telescope system which should …

Effects Of Gamma Radiation On Ion Exchange Membranes., John R. C. Roop

Masters Theses

No abstract provided.

Composite Beams In Building Constructions., Mahendrasinhji M. Jhala

Masters Theses

"The use of composite beams is very common in bridge and. in building construction due to the fact that a savings in material is effected.

The study herein shows a simplified procedure for design of composite beams. A number of design charts for rapid selection of a wide-flange section and the necessary cover plates are presented herein. These charts are based on economic sections of steel beams when used in a simple span, if one knows the approximate depth of the beam, slab thickness, allowable stresses in the steel and concrete and live load moment, it is very easy to …

Application Of Photoelasticity To The Stability Of Slopes In Open-Pit Mines., Aly Hemedah Gomah

Masters Theses

"A study of the stability of wall slopes in open pit mines was performed by preparing photoelastic epoxy-resin models representing open pit mines with various slope angles. The models were loaded centrifugally, using the 'locked-in' stress technique. Due to the relatively large sizes of the models, stress distributions could not be recorded with the photographic equipment available. Therefore, fringes and isoclinics were plotted directly on the models themselves. The fringes were used to calculate the shear stress concentrations at arbitrary points in the model from known stresses at control points in the models. The type of slope failure that was …

Digital Computer Design Of Compensation For Linear Control Systems, Larry C. Amsler

Masters Theses

"If a control system is to be synthesized, it is inferred that a plant or process is present which must be controlled, and the problem of how to design the control system then arises. The first step is to decide on performance specifications to which the complete system must conform. These specifications may involve such things as the system steady state response, transient response, or frequency response. Any of several synthesis methods may then be applied to complete the system design.

In this study a synthesis method is developed for single-loop linear feedback systems. First, the number of compensating poles …

The Electrochemical Degradation Of Alkyl Benzene Sulfonate., Melvin David Rickard

Masters Theses

"The ever increasing use of nonbiodegradable synthetic detergents, mainly the alkyl benzene sulfonates, has created difficulties in water and wastewater treatment, and in stream pollution. Although considerable attention has been given to this problem, no solution has been developed which can be effectively employed in the abatement of detergent pollution.

The purpose of this investigation was to determine the feasibility of the use of direct current electrochemical degradation in the removal of alkyl benzene sulfonates (ABS) from water. The rate and degree of completion of the electrochemical reactions were determined, and the nature of the end products formed was investigated. …

An Electrolytic Polishing And Recrystallization Study Of Zinc And Zinc Alloys., Roy Ashley Smith

Masters Theses

"A Unitron hot stage and polarized light were used to enable direct observation of recrystallization in high purity (99.99 per cent) zinc and high zinc content alloys. Electrolytic polishing was investigated in an attempt to prepare unetched surfaces which would show good structural contrast under polarized light and thus permit structural changes occurring during recrystallization to be observed.

Kinetic data obtained from a sequence of photographs during each recrystallization trial showed typical sigmoidal isothermal reaction curves characteristic of a nucleation and growth process. It was determined that rates of nucleation and grain growth are a maximum over the same time …

Permeability Of Organic Protective Coatings And Relation To Film Thickness, Bipin N. Doshi

Masters Theses

“Special types of coating systems are used to protect industrial products and structures against corrosion. Many millions of dollars are spent each year for these coatings. The ability of protective coatings to reduce or inhibit corrosion depends on a variety of factors such as dry film thickness, resistance to permeation of ions and vapors, temperature, pressure, structure of binder, nature of pigment, electrolytic resistance, and many others.

The initial work done by Larry Inglis on the permeability of coatings and it's relation to thickness of coating films showed that the permeability, as determined by under film corrosion, was independent of …

A Study Of The Relative Electric Resistance Of Commercial Steels And Pure Iron, William Eugene Wistehuff

Masters Theses

"The change in relative electric resistance of five commercial steels, Armco Ingot Iron and Pure Iron were studied over the temperature range of 800°C to 1100°C in an attempt to correlate the phenomena of hot or red shortness with a change in the Electric resistance .

The results from the above resistance measurements were compared with mechanical tests of the same steels to show that at the point at which the iron sulfide liquid forms there is a definite change in the slope of the electric resistance vs temperature curve.

Also studied was a discontinuity in the electric resistance vs …

A Study Of The Haeffner Effect In Mercury, James Nicholson Baysden

Masters Theses

"In 1953, E, Haeffner reported that when he passed a direct electric current through a capillary tube filled with mercury, he obtained a separation in the isotopes of mercury with the heavier isotopes being enriched at the negative terminal and the lighter isotopes at the positive terminal. This effect has since been referred to as the Haeffner Effect, Since the original experiment with mercury, other investigators have observed this effect in many other liquid metal systems.

This investigation of the Haeffner Effect in mercury involves the use of a radioactive isotope of mercury (Hg 203) as a tracer to follow …

Parameters In Ablation Heat Sheilds, Franklin Chang Liang Lin

Masters Theses

"The desired result of this paper is a method of determining temperature distribution and burn off rate in a semi-infinite rod or shield subjected to a large heat flux. The possible methods of determination were investigated, and it was felt that an analytical approach turned out to be the most feasible.

The analytical analysis employed involves the use of the Fourier's general equation for one dimensional heat flow. Transformations from stationary to moving coordinates reduces the problem from unsteady state to steady state boundary conditions. The resulting equations can be applicable to the extent for the heat flow problems involving …

Determining Design Freedom Of Linear Feedback Control Systems, Harley D. Brixey

Masters Theses

“The problem confronted in this thesis is to develop a method or procedure to be used in determining the amount of design freedom that is available in any given linear feedback control system by working with the signal flow-graph representation of the system.

Literature was reviewed that deals with basic signal flow-graph theory and degrees of design freedom. Signal- flow-graph theory that forms a foundation for the development is presented.

The development consists of starting with an essential signal-flow graph of order one. The sensitivity and transmittance functions are written for this essential graph in terms of graph symbols; then …

Impulsive Loading Of Metals And Alloys, William Barnes Mclane

Masters Theses

“This thesis deals with the construction of an explosive deformation apparatus. Using the apparatus an investigation was made of the deformation changes in the structure of a 10% uranium-aluminum alloy and a hot rolled high carbon Manganese steel. Also a study of deformation through different thickness of Stainless Steel, Type-304, plates was carried out.

All of the deformations were obtained using a constant explosive charge consisting of a #6 commercial blasting cap coupled with a commercial chemical booster"--Abstract, page ii.

Thermocouple Shape Influence On Response In A Dynamic Compressible Fluid Atmosphere, Philip J. Steger

Masters Theses

"This investigation was performed to determine whether the geometrical shape of a thermocouple used to measure the temperature of a dynamic fluid atmosphere had any affect on its recovery factor and time response.

A converging nozzle was used to establish a dynamic fluid stream in which shaped silver solder junctions of copper-constantan thermocouples were tested. The velocity of the working fluid, air, was about 1000 ft/sec at the test point.

The investigation was successful, within experimental limits, in determining that the recovery factor of a bare thermocouple junction is not influenced by geometrical shape The results agreed substantially with available …

Interaction Curve For A Beam Column., Mahendra Khushalchand Sanghavi

Masters Theses

"The theoretical interaction curve for a circular section is established. Experimentally the interaction curve f or a beam-column with a varying circular cross section, is established. The effect of stress history is discussed, and the comparisons of different interaction curves are made"--Abstract p.i

The Design, Construction, And Calibration Of An Apparatus To Determine The Thermal Conductivity Of Solids, Alan Edward Stephenson

Masters Theses

"Many pieces of equipment have been designed to determine the thermal conductivity of solids. They all, however, depend on the application of Fourier's equation of heat conduction in solids to determine the thermal conductivity. The apparatus used in this investigation is a modification of the guarded hot plate method used by the American Society for Testing Materials. Operation of the device is given in a step by step procedure both as a guide for others and also to show how it was operated during calibration of the apparatus. Data obtained in the calibration is given in tabular and graphical form …

Derivation Of A Method To Determine Reactions And Deflection Of A Continous Beam On An Elastic Foundation, Louis Richard Fuka

Masters Theses

“The purpose of this thesis is to develop a method for determining the reactions and deflection curve of continuous beams partially supported by an elastic foundation. The method involves representation of an arbitrary loading and the intermediate redundant reactions as Fourier Series. Redundant intermediate reactions are determined by the solution of an equal number of linear equations. The remaining reactions are determined by the application of statics.

This same method can be used for simply supported beams on an elastic foundation and for continuous beams without an elastic foundation”--Abstract, page ii.

Preliminary Investigation Of Acid Treatment For The Stabilization Of Doloma, Deward Pan

Masters Theses

"The work presented in this thesis is the result of an investigation to develop an economical and successful means for producing a stable, hydration resistant compound on the surface of doloma particles by an acid treatment, which does not significantly alter the refractoriness of the material. Granite, a commercial doloma, from Valley Dolomite Corporation, was treated with different concentrations of inorganic acid-water solutions and organic acid-alcohol solutions for varying time at atmospheric pressure and temperature. The treated doloma was examined by (l) X-ray diffraction and (2) the hydration test.

It was found that the organic acid acted as a coating …

The Applicability Of Longwall Mining To American Coal Seams, Mehmet Turgut Tezcanli

Masters Theses

"The objective of this thesis is to show that mechanized longwall mining can be applied to thinner American coal seams with greater advantage than the conventional mechanized room-and-pillar methods now being used, provided that the proper equipment is employed in an effective manner."--Objective, page 1.

An Engineering Evaluation Of Surficial Soils Of Dent County, Missouri, William L. Durham

Masters Theses

“This study is the report of an investigation to: Determine the engineering characteristics of Dent County, Missouri soils using a pedologic soil association map for areal extrapolation of soil test data; and, Evaluate the feasibility of determining the engineering characteristics of all Ozark Region soils by the same method.

During the course of the study, the geology and pedology of the county was investigated and a sampling and testing program formulated. Pedologic soil types in each soil association area were sampled, tested in the laboratory, and the results interpreted.

The results obtained showed that the engineering characteristics of the soil …

The Separation Of Strontium-90 From Cesium-137 And Fractionation Of Rare Earth Elements By Liquid-Liquid Extraction., Surendra D. Khanna

Masters Theses

No abstract provided.

A Study Of Rotational Critical Speed For A Multi-Mass System, Richard K. Brockmann

Masters Theses

"The object of this thesis is to demonstrate, by use of an IBM-1620 digital computer, a fast efficient method for locating natural frequencies of multi-mass rotational systems. Stress and deflection characteristics are examined at these frequencies also.

The shafts considered in this thesis are simply supported and symmetrically loaded with five concentrated masses. These five masses are placed at increments of 10 inches on a 60 inch shaft. The variable to be examined is shaft diameter, which is varied from 0.2 inch to 1 inch by increments of 0.2 inch. The effect of shaft weight, which is a function of …

Experimental Stress Analysis Of Bolts In A Flange Coupling, Bansidhar Shah

Masters Theses

"This thesis deals with the strength of a bolted joint which is subjected to tensile and bending loads. The purpose of this investigation was to derive expressions for the stresses developed in the bolts and the load producing separation of the joint.

A laboratory study of a flange coupling was made and the behaviour of flange bolts under different clamping forces was studied in tension and bending tests. The strain in the bolt was measured by mounting the strain gages on the shank of the bolt. From this, a graph of applied load versus strain in the bolt was plotted. …