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Articles 1681 - 1698 of 1698
Full-Text Articles in Engineering
Torque-Stress Relations In Bolts With National Fine Threads, Eugene Casper Chase
Torque-Stress Relations In Bolts With National Fine Threads, Eugene Casper Chase
Masters Theses
"Stresses, in bolts, caused by initial tightening have long been a problem to machine designers. To take care of these unknown stresses, produced by initial tightening, designers have used empirical formulas. These formulas originally used for National Coarse Threads, have been carried over into the field of National Fine Threaded bolts. No known tests have been conducted to determine whether or not these formulas hold in the initial tightening of Fine Threaded bolts. Initial tightening stresses may be caused by one of two ways. First, consider two flat ground plates to be held together by bolts to form a steam …
Temperature Fluctuations Within A Solid Of Finite Thickness, William Sanford Hogan
Temperature Fluctuations Within A Solid Of Finite Thickness, William Sanford Hogan
Masters Theses
"The object of this thesis is to determine by analytical methods the temperatures within a homogeneous plate of finite thickness subjected to a constant temperature on one side and a periodically fluctuating temperature on the opposite side. The heat flow in the other two directions is considered negligible in this problem. Periodic changes of temperature are frequent in nature and in engineering. The surface of the earth is heated periodically by the sun in its daily and annual cycle and the periodic temperature changes below the surface and the question to which depth these changes are appreciable were dealt with …
The Effect Of The Convection Coefficient On The Temperature Amplitude In Periodic Heat Flow, Gordon L. Scofield
The Effect Of The Convection Coefficient On The Temperature Amplitude In Periodic Heat Flow, Gordon L. Scofield
Masters Theses
"The problem to be investigated in this thesis is that of periodic heat flow in a semi-infinite solid. Periodic flow means that heat flow is a continuous function of time and repeats itself at regular intervals. A semi-infinite solid is one which is bounded by one and only one plane. This subject has received considerable attention in the field of soil temperatures, both at the surface of the earth and at various depths. The surface of the earth is subjected to temperature changes which are nearly periodic. These temperature changes take place both daily and annually. A knowledge of these …
Analytical Investigation Of Thin And Moderately Thick-Walled Tubing Under Peripheral And Biaxial Loading, Frank Joseph Cizek
Analytical Investigation Of Thin And Moderately Thick-Walled Tubing Under Peripheral And Biaxial Loading, Frank Joseph Cizek
Masters Theses
"The problem then, resolves itself into a study of the behavior of thin-walled and moderately thick-walled cylinders under the effects of an external fluid pressure acting alone, or the effects of an external fluid pressure acting simultaneously with an axial loading. In this thesis a theoretical or analytical approach will be used. Some application and reference will be made to oil-well casings in particular, but the solutions will not be restricted to oil-well casing alone. it must be recognized that the tubing problem involves the problem of unstability before the proportional limit of the metal is exceeded and a similar …
Torque Characteristics Of High Speed Steel Twist Drills, Tien Chi Lee
Torque Characteristics Of High Speed Steel Twist Drills, Tien Chi Lee
Masters Theses
"The drill is the most efficient tool used by machinists, for in no other tool is the cutting surface as large in proportion to the cross sectional area of the body or part that is its real support. Drills have shared evolutionary developments from carbon steels to high speed steels and from flat to twist drills. Many investigations have been made on the twist drills, but due to the majority of their work being based on the size of drills from 1/2 to 1-1/2 inches or larger, there is a dearth of published data on the general problem of drills …
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Gases Through Porous Media, Ralph Davis
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Gases Through Porous Media, Ralph Davis
Masters Theses
"The purpose of this investigation is to determine the feasibility of applying the relaxation method of mathematical analysis to the solution of problems involving the flow of gases through porous media. The relaxation method was first applied to two-dimensional problems by Christopherson and Southwell, who applied it to problems in stress analysis. It was later applied to steady-state heat conduction problems by H. W. Emmons and to steady-state flow of incompressible liquids by A. A. Zwierschowski. The solutions of problems involving the flow of gases through porous media is difficult for all but the simplest boundary conditions, and impractical for …
Water Injection In The Modern Automotive Spark Ignition Engine, Leonard Carl Nelson
Water Injection In The Modern Automotive Spark Ignition Engine, Leonard Carl Nelson
Masters Theses
"The injection of water in the spark ignition engine is not new. The effect of humidity in the air on the performance of the spark ignition engine probably initiated the early investigations. The water vapor in the inlet air decreases the speed of the flame front and necessitates spark advance to assure maximum power and maximum efficiency. Water particles in the air evaporate during the compression and combustion of the inducted charge and decrease the tendency of the engine to detonate. These effects are very evident when operating the spark ignition engine in a moist atmosphere. Water is not a …
Automatic Wheel Balancer For Automobile Wheel, Frederick Eugene Nevin
Automatic Wheel Balancer For Automobile Wheel, Frederick Eugene Nevin
Masters Theses
"Automobiles of today have been so constructed that greater speeds under safer conditions now exist. One of the improvements has been the low pressure tire. These tires carrying less pressure necessitates a casing of greater volume. This has created a tire of greater thickness in the axial direction but at the same time has decreased the diameter. Because of these innovations in present-day tires the author believes the wheel assembly (tire, tube, wheel, and brake drum) should be considered as a rotating cylinder not as a rotating disk. This being the case, the condition of dynamic unbalance is more critical. …
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Fluids Through Porous Media, Alexander Antoine Zwierzchowski
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Fluids Through Porous Media, Alexander Antoine Zwierzchowski
Masters Theses
"The purpose of this investigation is to determine the feasibility of applying the relaxation method of mathematical analysis to the solution of problems in rheology. The relaxation method was first introduced by R. V. Southwell who applied it to the problem of electrical conductivity. It was later used by M. W. Emmons to solve two-dimensional heat conduction problems. The steady-state flow of fluids through porous media can be difficult or impossible by the usual analytical methods even with rather simple boundary conditions. The relaxation method promises to provide an easier method of solution and to provide a means of solving …
Investigation Of The Stress-Strain Of American Standard Or National Course Bolts, Clare Jackson Thorpe
Investigation Of The Stress-Strain Of American Standard Or National Course Bolts, Clare Jackson Thorpe
Masters Theses
"The purpose of this investigation is to determine, if possible, a formula for the initial tensile load that will consider the Nominal Diameter of the bolt and the yield point of the material from which the bolt is manufactured; to determine, if possible, a torque stress relation, when tightening the bolt"--Preface, page iii.
Air Cooled Engine Cooling Fins Redesigned By Use Of The Membrane Analogy For Heat Conduction, Eberhard Hammel Miller
Air Cooled Engine Cooling Fins Redesigned By Use Of The Membrane Analogy For Heat Conduction, Eberhard Hammel Miller
Masters Theses
"The purpose of this investigation is to determine the feasibility of applying the two-dimensional heat conduction membrane analogy to the redesign of cooling fins of air-cooled engines"--Preface, page ii.
The Application Of The Membrane Analogy To The Solution Of Heat Conduction Problems, Lloyd Hines Wilson
The Application Of The Membrane Analogy To The Solution Of Heat Conduction Problems, Lloyd Hines Wilson
Masters Theses
"The purpose of this investigation is to determine the feasibility of applying the membrane analogy to the solution of two-dimensional heat conduction problems. This investigation will deal only with heat conduction in the steady state through homogeneous media"--Preface, page iii.
Subsurface Pressure Regulation Of High Pressure Condensate Wells, John Oscar Farmer
Subsurface Pressure Regulation Of High Pressure Condensate Wells, John Oscar Farmer
Professional Degree Theses
"The discovery of deeper production and higher pressures has resulted in the need for control equipment for preserving and protecting these great reservoirs of energy; and, in the case of high pressure condensate wells, has resulted in the need for means for preventing freezing or hydrate solidification caused by throttling the production. Development of a successful removable subsurface regulator has enabled operators to reduce dangerously high surface flowing pressures to safe workable limits; and, by moving the point of principal pressure reduction from the surface to warmer subsurface levels, has resulted in complete elimination of freezing conditions in flow lines. …
Applicability Of Hydraulic Drives To Oil-Well Pumping, James Francis Mcdonald
Applicability Of Hydraulic Drives To Oil-Well Pumping, James Francis Mcdonald
Professional Degree Theses
"To date, to the author's knowledge, there has been no successful application of the hydraulic drive to oil-well pumping. It is understood, however, that there is, at the present time, an installation in the Oklahoma City oil field, near Oklahoma City, Oklahoma, wherein a manufacturer of hydraulic couplings and an oil-producing company have cooperated in experimental work with the fluid drive applied to a pumping well. No technical data or information regarding the success of the application have, as yet, been released and, consequently, this work is presented primarily for the purpose of creating interest in the application of "Fluid …
The Application Of Fluid Level Measurements To Oil Wells In Kansas, Charles Calvert Rodd
The Application Of Fluid Level Measurements To Oil Wells In Kansas, Charles Calvert Rodd
Professional Degree Theses
"The mechanics of determining fluid levels and a knowledge of the depth-to-fluid in a well are matters of general interest. To the oil-producer, however, such information is of value only as it may affect the operation of a well or reservoir"--Uses of Fluid-Level Measurements, page 9.
Cupola Practice In Modern Gray Iron Foundry, George E. Mellow
Cupola Practice In Modern Gray Iron Foundry, George E. Mellow
Professional Degree Theses
"Cupola practice, as described in this paper, will include only the practical operation of a cupola and the details of the work necessary in daily routine, and very little of the theory of combustion, or history of cupola development, is presented. A brief description of the cupola will give an idea of its construction, and the names of the parts may be found on the sketch herewith"--page 1.
Boiler Feed Water Purification At The Gorge Power Plant, Akron, Ohio, Bernerd William Adams
Boiler Feed Water Purification At The Gorge Power Plant, Akron, Ohio, Bernerd William Adams
Professional Degree Theses
"The conditions of operation at the Gorge Power Plant were such that raw water was used in all the boilers. The boilers were operated at an average of about one-hundred and seventy-five percent rating and considerable scale formed in the tubes of the boilers. It was evident that this caused a large loss in fuel and increased the expense of maintenance. It was necessary to employ a number of men to remove the scale. An investigation was made to determine as nearly as possible the loss caused by the use of impure water. After the investigation, an attempt was made …
Measurement Of Air Under High Pressure By Orifice Method, George E. Mellow
Measurement Of Air Under High Pressure By Orifice Method, George E. Mellow
Bachelors Theses
"The measuring of compressed air, under high pressures, by means of observing the drop in pressure on passing thru an orifice, is in a new field of endeavor. The necessity of measuring compressed air, in order to handle it economically, is obvious. Hence, the importance of a simple device by which this may be done. A device, which may be duplicated at any time, at any place, with very little expense, and ordinary materials"--Introduction, page iii.