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Articles 1621 - 1650 of 1711
Full-Text Articles in Mechanical Engineering
An Improved Fission Product Pressure Model For Use In The Venus-Ii Disassembly Code, Ray Leland Jensen
An Improved Fission Product Pressure Model For Use In The Venus-Ii Disassembly Code, Ray Leland Jensen
Theses and Dissertations
The world's growing need for safe, reliable, and long-term energy sources has intensified the research being conducted in the development of nuclear power. The operation of power reactors is contingent upon the continued availability of the fissile material required to maintain a critic a l reactor. The only naturally occuring fissile material is an isotope of uranium, U-235, which only accounts for 0.76 percent of the uranium that is mined. Due to the relative scarcity of this important fissile material it is estimated the United States' sources of economically recoverable fissile material will be delinquished with in about twenty-five years.^1
Steady-State Fluidics: Computer-Aided Analysis Of Analog Fluidic Circuits By Use Of Experimentally Determined Characteristic Curves, Raymond P. Martin Jr.
Steady-State Fluidics: Computer-Aided Analysis Of Analog Fluidic Circuits By Use Of Experimentally Determined Characteristic Curves, Raymond P. Martin Jr.
Theses and Dissertations
One of the fundamental tasks confronting engineers is the transmission and control of energy. The engineer, faced with this requirement and influenced by details of a specific, situation, his education and experience, and the customer's desires, will probably select a mechanical, electrical, or electro-mechanical system. Often a better choice exists—the use of a fluid power system. Fluid power systems employ pressurized fluids, liquids and/or gases, to transmit and control energy. Hydraulic systems use liquids, usually special oils or treated water. Pneumatic. systems use air or other gases. Both types are versatile and find a wide range of application.
Steady State Fluidics: The Static Matching Of Fluidic Amplifiers And Loads, Frank J. Redd
Steady State Fluidics: The Static Matching Of Fluidic Amplifiers And Loads, Frank J. Redd
Theses and Dissertations
"Fluidics" is the title applied to a relatively new technology which is concerned with the control of fluid power and the processing of information through the use of the fluid mechanical properties of the fluid medium itself. The absence of moving parts and the relatively low sensitivity to enviromental conditions suggest the probability that fluidic systems will prove to be faster and more reliable than the mechanically controlled (valves, diaphragms, springs, etc.) fluid systems which they are designed to replace.
Alcohol Assisted Hydrocarbon Fuels: A Comparison Of Exhaust Emissions, Power Output And Fuel Consumption Using Static And Dynamic Engine Test Facilities, Dwight J. Bushnell
Alcohol Assisted Hydrocarbon Fuels: A Comparison Of Exhaust Emissions, Power Output And Fuel Consumption Using Static And Dynamic Engine Test Facilities, Dwight J. Bushnell
Theses and Dissertations
America’s energy crunch— something new for a country that has been used to great affluence. America’s smog— an eye stinging, lung burning situation which the Environmental Protection Agency has "promised" to rectify. These are two outstanding problems that face the engineer and scientist of today. The end of the era of cheap gasoline has brought the beginnings of a quiet revolution to Detroit: an improvement in the efficiency, economy and emission level of the American automobile. Word has penetrated to the automotive engineers that the emissions level, fuel economy and automobile safety are the prime design considerations for the automobile …
Determination Of The Most Economically Feasible Method For High Volume Machining Of A Discharge Port In A Powder-Metal Compressor Cylinder, Perry W. Carter
Determination Of The Most Economically Feasible Method For High Volume Machining Of A Discharge Port In A Powder-Metal Compressor Cylinder, Perry W. Carter
Theses and Dissertations
The purpose of this study was to ascertain the most economically feasible method for high volume machining of a discharge hole in a power metal compressor cylinder.
Measurement And Analysis Of Data In Turbulent And Transition Regions Of Two-Phase Flow, Akula Venkatram
Measurement And Analysis Of Data In Turbulent And Transition Regions Of Two-Phase Flow, Akula Venkatram
Theses and Dissertations
The main aim of the project was to examine the possibility of using the hot wire anemometer to detect particles in a fluid. It was hoped that the presence of the particles would affect the autocorrelation plot and the energy spectrum of the velocities measured in the fluid.
Transient Convective Heat Transfer In Closed Containers During And After Gas Injection, Jennings Donell Means
Transient Convective Heat Transfer In Closed Containers During And After Gas Injection, Jennings Donell Means
Theses and Dissertations
This dissertation presents experimental data correlations for the spatially - averaged convective heat transfer coefficient for thin walled closed containers during and after gas injection. The different modes of heat transfer were identified, and correlations were made for each. Correlations are presented for the injection period, post-top injection, post-bottom injection, post- tangential, post-radial injection, and post-ejection heat transfer for various tank geometries. Of special significance are the very high heat transfer rates that were shown to be present in some cases immediately after injection. Heat transfer rates were shown to be, for a short period, up to almost two orders …
Analysis Of Heat Generation And Temperature In High Speed, High Temperature Bearing Balls, Hans R. Ringger
Analysis Of Heat Generation And Temperature In High Speed, High Temperature Bearing Balls, Hans R. Ringger
Theses and Dissertations
This thesis reports an investigation of the generation of heat on, and the prediction of temperature of high-speed, dry-film lubricated, stainless steel bearing balls.
The Design And Analysis Of An Electro-Pneumatic Signal Converter, Richard K. Thornton
The Design And Analysis Of An Electro-Pneumatic Signal Converter, Richard K. Thornton
Theses and Dissertations
In the field of process control it is desirable to study dynamic characteristics such as frequency response and distortion when determining just how equipment is to be controlled. Pneumatic controllers, transmitters, control valves, etc., all have dynamic behaviors which can be expressed mathematically as transfer functions. Each component plays an important role in determining the entire system behavior. Frequency response is one technique used in developing a component’s transfer function. By driving a device with a sinusoidal signal of fixed amplitude and frequency the output amplitude and phase shift are measured and compared with that of the input. Varying the …
Finite Conductance Element Method Of Conduction Heat Transfer, E. Clark Lemmon
Finite Conductance Element Method Of Conduction Heat Transfer, E. Clark Lemmon
Theses and Dissertations
One of the basic goals in engineering is to formulate models which will provide a means for analytically predicting observed phenomenon. For some time, the partial differential equations describing the steady state and transient conduction of heat within a solid have been available. However, the straight forward use of these equations is often restricted due to the surface geometry of the solid. If the surface geometry is at all irregular, exact solutions will in general not exist. In that case, a solution is sought by some approximate numerical technique. The two techniques most often used are the finite difference method …
An Aerodynamic Investigation Of The Causes Of Overhead Electrical Transmission Line Gallop, Eric Nathan Skousen
An Aerodynamic Investigation Of The Causes Of Overhead Electrical Transmission Line Gallop, Eric Nathan Skousen
Theses and Dissertations
Overhead electrical transmission lines vibrate due to the action of a prevailing wind. These cable vibrations can be classified into two categories— high-frequency and low-frequency. The high-frequency vibrations, "aeolian" vibrations or "singing wires," is a low-amplitude phenomenon. It has been largely controlled with the use of various mechanical dampers [l, 2],
Peak Temperature Distribution In Steel Plates During Arc-Welding, Bhanuprakash M. Patel
Peak Temperature Distribution In Steel Plates During Arc-Welding, Bhanuprakash M. Patel
Theses and Dissertations
The welding of steel plays an important role as a major fabricating process in industry. In the field of welding metallurgy, much attention is given to the effects which a welding arc or flame will have on the structure and properties of the metals being joined. The engineer is interested in the intensify and extent of physical changes brought about by the unavoidable heat treatment which accompanies the execution of a weld. In order to gain some quantitative appreciation of the way in which the metallurgical effects of welding depend on welding variables, geometry, and physical properties, considerable attention has …
An Experimental Investigation Of The Relation Between The Cooling Rate And Welding Variables In Fusion Welding, Sujit Biswas
An Experimental Investigation Of The Relation Between The Cooling Rate And Welding Variables In Fusion Welding, Sujit Biswas
Theses and Dissertations
In the field of welding metallurgy, much attention is given to the effects which the welding arc or flame will have on the structure and properties of the metals being joined. The engineer is interested in the intensity and extent of physical changes brought about by the unavoidable "heat treatment" which accompanies the execution of a weld.
Application Of The Finite Element Method Using The Method Of Weighted Residuals To Two Dimensional Newtonian Steady Flow With Constant Fluid Properties, Mien Ray Chi
Theses and Dissertations
In this thesis we will be concerned with the two-dimensional steady laminar Newtonian fluid flow with constant fluid properties in Cartesian coordinate system. More precisely, we will consider a flow for which the interesting dependent variables, for example, velocity, vorticity, stream function, etc., are expressible as functions of two independent Cartesian coordinates.
Rotary Engine Designs Based On A Particular Off-Set Cavity/Rotor System, M. Dean Black
Rotary Engine Designs Based On A Particular Off-Set Cavity/Rotor System, M. Dean Black
Theses and Dissertations
The subject of this thesis is a family of rotary engines, each consisting of a two-tipped rotor turning about an off-center axis within a nearly round cavity.
The Optimum Design Of A Shock Absorber To Minimize The Force Transmitted To The Supporting Base Of A Vibrating Equipment, J. P. Singh
Theses and Dissertations
The present study involved two types of analyses as a part of the investigation leading to the design of a shock absorber providing optimal vibration control and minimum transmissibility. Those two types of analyses were the following.
Determination Of Drag And Lift Coefficients For A Spinning Baseball, M. B. Parekh
Determination Of Drag And Lift Coefficients For A Spinning Baseball, M. B. Parekh
Theses and Dissertations
Few experiments have been carried out in the past to deter mine the effect of the lift and the drag forces on the trajectory of a ball used in any game. In a baseball game, it was reported that sometimes the ball took a sharp turn aburptly in the region of 15 to 20 feet from the home plate. This indicated a sudden change of the forces acting on the ball. The principal forces acting w ere as fol lows: 1. Weight of the ball. 2. Drag force acting in the direction parallel to the relative wind. 3. Lift force …
The Dynamic Characteristics Of A Beam Whose Material Is Represented By A Three-Parameter Viscoelastic Solid, Vishnurao K. Devkar
The Dynamic Characteristics Of A Beam Whose Material Is Represented By A Three-Parameter Viscoelastic Solid, Vishnurao K. Devkar
Theses and Dissertations
Man observes many phenomena occurring in nature which he can use to his benefit. He observes how physical quantities vary as a function of their environment in order to predict how these variations will affect a system he wishes to design. For this purpose, he must establish a model that is representative of the relation between those physical quantities and certain environments to which they are subjected.
Application Of The Maximum Deformation Theory Of Failure To The Torsional Failure Due To Fracture Of 4140 Steel, C. V. Krishna Kumar
Application Of The Maximum Deformation Theory Of Failure To The Torsional Failure Due To Fracture Of 4140 Steel, C. V. Krishna Kumar
Theses and Dissertations
Forming is the fastest way of changing the shape of a piece of metal. It is the most economical process to use for high-volume mass production when the shape of a part is such that it can be made by one of the forming operations
A Study In The Design And Development Of A Baseball Pitching Machine, Neal M. Lundwall
A Study In The Design And Development Of A Baseball Pitching Machine, Neal M. Lundwall
Theses and Dissertations
Throughout history man has had the need of services which require great skill or tremendous strength or delicate consistency on the part of those who perform. Much of the time he has turned to the machine to accomplish these requirements.
Transition From Laminar To Turbulent Flow For A Two-Phase Mixture, Mohammed Sharief Qureshi
Transition From Laminar To Turbulent Flow For A Two-Phase Mixture, Mohammed Sharief Qureshi
Theses and Dissertations
A phase is simply one of the states of matter. Multiphase flow is the simultaneous flow of several phases. Two-phase flow is the simplest case of multiphase flow.
A Computer Simulation Of A Partial Venous System Of A Human Lower Extremity, David C. Smith
A Computer Simulation Of A Partial Venous System Of A Human Lower Extremity, David C. Smith
Theses and Dissertations
The human body is truly a fascinating and complex creation of our Maker. Because of the complexity and variability, many of its workings were little known until recent years. Some of the more amazing facts of the circulatory system follow. If the individual blood vessels of a single adult, i.e., artery, arteriole capillary, venule and vein, were laid end to end, they would extend more than 60,000 miles. For the average adult, the heart beats 70 times per minute; for the well-conditioned athlete, 50-60 beats per minute; and for the extraordinary athlete, as few as 37 times per minute. The …
Transient Convective Heat Transfer Coefficient For Injection Into Rigid Vessel, James Edward Steiger
Transient Convective Heat Transfer Coefficient For Injection Into Rigid Vessel, James Edward Steiger
Theses and Dissertations
The purpose of this study was to develop and demonstrate a method for experimentally determining the convective heat transfer in a rigid vessel while air was being injected. The heat transfer took place between the air in the pressurized vessel and the surrounding walls which were maintained at a temperature of 32 F. with a circulating ice water bath. The study considers the effects of injection geometry and injection flow rate on the heat transfer process. The problem of heat transfer after injection has been considered by Means (1), and was responsible for establishing this study. The experimental technique used …
Conduction Error In Thermocouples Embedded In Low Conductivity Material, Tumkur G. Nagaraju
Conduction Error In Thermocouples Embedded In Low Conductivity Material, Tumkur G. Nagaraju
Theses and Dissertations
Thermocouples are generally used as devices to determine the internal temperature of any material. The purpose of the temperature measuring device is to measure the temperature which would exist at some known location if the device were not present. The thermocouples are embedded in the material in order to study the temperature-time history of the point of location. The presence of the thermocouple induces error in the temperature measured. This error becomes significant if heat is conducted into or away from the point of measurement by the sensor itself, or if the sensor insulates the point. This would result from …
The Design Of A Laser Doppler Velocimeter, Marlo R. Anderson
The Design Of A Laser Doppler Velocimeter, Marlo R. Anderson
Theses and Dissertations
A relatively new method of measuring local velocity in a fluid stream has been devised which eliminates some of the inherent problems of the traditional methods. This method senses the Doppler shift of light scattered from a laser beam incident on particles suspended in the fluid. The Doppler shift is proportional to the particles (or fluid) velocity. This new technique has several distinct advantages over the more traditional methods of velocity measurement.
A Study Of The Effects Of Some Parameters Of The Galloping Of Electric Transmission Lines, Leland J. Coleman
A Study Of The Effects Of Some Parameters Of The Galloping Of Electric Transmission Lines, Leland J. Coleman
Theses and Dissertations
Freezing rainstorms coupled with moderate winds have often been observed to cause telephone lines and power transmission cables to begin bouncing up and down. This slow frequency high amplitude oscillation, or galloping as it is sometimes called, can build up to large amplitudes before the oscillation either damps out or persists at some constant amplitude. It has been reported by Edwards and Livingston [1] that the amplitude of galloping on transmission lines has been as large as forty feet. Galloping oscillations occur at relatively low frequencies; from .1 to 1 Hz. [1] near the natural frequency of the suspended cable.
A Dynamic Model Of A Small Manufacturing Company, Abraham John
A Dynamic Model Of A Small Manufacturing Company, Abraham John
Theses and Dissertations
A manufacturing company typically has the objective of maximizing the long-term value of its common stock while satisfying its customers. To achieve this, the company might increase the quantity and improve the quality of production. Since the company is operating in a dynamic environment, its policies should be dynamic also, to achieve its objective.
A Data Reduction Technique For Drag-Coefficient Data For Spheres, Stephen Thomas Merrell
A Data Reduction Technique For Drag-Coefficient Data For Spheres, Stephen Thomas Merrell
Theses and Dissertations
The object of this investigation was to obtain a reliable technique for finding the drag coefficient for a sphere falling at a non-constant velocity through air. And then to apply this technique to the data collected by R. G. Lunnon in 1925^(4)*.
An Optimization Technique Applied To The Determination Of Modal Damping Coefficients, Craig C. Smith
An Optimization Technique Applied To The Determination Of Modal Damping Coefficients, Craig C. Smith
Theses and Dissertations
Although analytical techniques are generally available for the simulation of dynamic systems, often these techniques require a great deal of computer time and storage. This difficulty was vividly pointed out by a previous thesis undertaken in this Department by R. L. Webster (1). Mr. Webster undertook the determination of orthotropic material properties using dynamic response test data from plates. A major difficulty which was encountered was the enormous amount of computer time required for the simulation. This thesis is an investigation of a method which when fully developed, may provide the ability to simulate such systems much more efficiently.
Temperature Protection For Fruit Trees By Air-Supported Plastic Structures, Ram T. Gadhavi
Temperature Protection For Fruit Trees By Air-Supported Plastic Structures, Ram T. Gadhavi
Theses and Dissertations
The greatest weather enemy in all fruit destruction is the late spring frost which moves across the country under the high pressure areas that are occasionally seen on the weather maps, and kills the fruit buds.