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Articles 1  15 of 15
FullText Articles in Engineering
Experimental Analysis Of VBelt Tensile Loads, John Mark Wiesehan
Experimental Analysis Of VBelt Tensile Loads, John Mark Wiesehan
Masters Theses
"An experimental investigation was conducted to determine the magnitude of vbelt stresses in automotive drive situations. A constant tension belt test apparatus was designed and fabricated using a variable speed cradled D.C. motor for power and two automotive alternators for absorption.
Free span stresses on the dynamic torque loaded belt drive were determined from the equations governing a pivoted drive system. Centrifugal stress was determined by a theoretical analysis of belt motion. Bending stresses were obtained from a static test employing strain gages mounted on the top of belts with exposed cord layers. The variation in load stress around ...
On The Complex Index Of Refraction Of Bulk Materials, Carol Jeanne Warren
On The Complex Index Of Refraction Of Bulk Materials, Carol Jeanne Warren
Masters Theses
"As a part of the investigation of classical reflectance, it is determined that the hemispherical reflectance for a material with a particular pair of optical constants can be approximated by computing the angular reflectance at sixty degrees, using Fresnel's generalized reflectance formulas.
Reflection methods for the purpose of determining the optical constants of a variety of materials are discussed. The unpolarized reflectance versus angle of incidence technique is used for determination of the optical constants of bulk solids. Restrictions on the simultaneous solution of the Fresnel equations are determined and a computer program is developed to compute values necessary ...
Transmission Measurements Through Liquids In A White Cell, David Earl Hurley
Transmission Measurements Through Liquids In A White Cell, David Earl Hurley
Masters Theses
"The suitability of using the White cell for determining the extinction coefficient of liquids was examined by measuring the attenuation of electromagnetic radiation, in the visible part of the spectrum, through distilled water. The analysis of the transmittance measurements through liquids in a White cell does not provide a sufficient number of independent equations to solve directly for the extinction coefficient. Reasonable estimates however can be made by employing a correction which accounts for changes in the mirror reflectance due to a liquidmirror interface.
The reduction in the transmittance of distilled water due to an oil film was studied for ...
Nucleate Pool Boiling Of RefrigerantOil Mixtures From Tubes, R. L. Dougherty
Nucleate Pool Boiling Of RefrigerantOil Mixtures From Tubes, R. L. Dougherty
Masters Theses
"This experimental investigation was conducted to provide design heat transfer data for applications involving the nucleate pool boiling of Refrigerants 11 and 113 from the external surfaces of tubes. Tests were conducted with 0.625in. o.d. and 1.125in. o.d. commercial copper tubing; at 1 and 2 atmospheres pressure; and with refrigerantoil compositions from 0 to 10 percent oil by weight. Results show that each of these parameters can affect the heat transfer coefficient"Abstract, page ii.
Interior Noise In Military Helicopters, Charles E. Perez Jr.
Interior Noise In Military Helicopters, Charles E. Perez Jr.
Masters Theses
"The Temporary Threshold Shift (TTS) or temporary hearing loss caused by excessive interior noise in military helicopters results in a critical degradation of the acoustically unprotected infantryman's ability to detect the existence or the approach of the enemy by hearing under combat conditions. The overall problem of noise reduction in helicopters consists of: (1) identifying the various noise sources, and (2) employing appropriate noise control techniques. Identification of the source is accomplished by the frequency correlation of 1/10octave band analysis of the interior sound levels measured within the helicopter cabin with nearfield sound generated by the sound sources ...
Hydrostatic Extrusion Of Waste Glass And Plastic, Subhash Govind Kelkar
Hydrostatic Extrusion Of Waste Glass And Plastic, Subhash Govind Kelkar
Doctoral Dissertations
"Waste glass and waste plastic combine to form a major portion of nonbiodegradable, solid waste. These waste products aggravate the already too serious problem of environmental pollution. Hence, a means is sought of utilizing this waste in the construction industry, thus solving two problems simultaneously  that of beautifying the environment, and of procuring inexpensive building materials.
Extrusion is not an uncommon process as far as the manufacture of original products is concerned. Hydrostatic extrusion is a modification of the process wherein a billet or slug of some material is forced to flow through a die under the influence of a ...
Methods For Predicting The Influence Of Intense Sound, Steady Flow, And Elevated Temperature On The Acoustic Performance Of Automotive Exhaust System Components, Richard Chuka Oboka
Methods For Predicting The Influence Of Intense Sound, Steady Flow, And Elevated Temperature On The Acoustic Performance Of Automotive Exhaust System Components, Richard Chuka Oboka
Doctoral Dissertations
"The principal objective of this investigation was to study the feasibility of developing laboratory techniques for automobileexhaust muffler design in order to reduce the amount of onvehicle trialanderror testing currently required. The investigation included (1) improving the capability of existing laboratory equipment to simulate the conditions in automobile exhaust (i.e., highamplitude pressure waves, steady flow, and elevated temperature), and (2) theoretical and experimental studies of typical acoustic elements (sidebranch resonators, expansion chambers, louvered tubes) used in muffler design. The sound fields used for these studies included pure tones, single pulses (tone bursts), random noise, and simulated automobile exhaust noise ...
Linear Stability Of NonParallel Flow In The Entrance Region Of Ducts, Francis ChungTi Shen
Linear Stability Of NonParallel Flow In The Entrance Region Of Ducts, Francis ChungTi Shen
Doctoral Dissertations
"An investigation is made of the linear stability of the developing flow of an incompressible fluid in the entrance region of annular ducts, circular tubes, and parallelplate channels. Small axisymmetric disturbances for annular duct and tube flows and small twodimensional disturbances for channel flow are considered in the analysis. In formulating the stability problems, account is taken of the transverse velocity component of the mainflow. This results in the modified OrrSommerfeld equations, one for annular duct and tube flows and the other for channel flow. The mainflow velocity fields utilized in the stability analysis are those from the solutions of ...
Rock Fragmentation By Subsurface Thermal Inclusions  A Finite Element Study, Mahendrakumar Ramkrishna Patel
Rock Fragmentation By Subsurface Thermal Inclusions  A Finite Element Study, Mahendrakumar Ramkrishna Patel
Doctoral Dissertations
"Although rock tunneling machines are being used extensively with performance and cost advantages over traditional drill and blast methods, their usefulness for hard rock excavation is far from being practical due mainly to the inability of present day mechanical cutters to penetrate these rocks economically. Among various novel techniques that are being investigated, internal heating methods seem to be the most promising. This investigation is concerned with a feasibility study of thermal rock fragmentation using heat to create indepth thermal inclusions.
The threedimensional problem of in situ rock fragmentation involves parallel rows of equidistant holes drilled to a constant depth ...
The Effects Of High Pressure And Temperature Environments On The Properties Of 6061T651 Aluminum, Patrick George Davidson
The Effects Of High Pressure And Temperature Environments On The Properties Of 6061T651 Aluminum, Patrick George Davidson
Doctoral Dissertations
"During this experimental testing program the effects of the simultaneous application of high pressure and temperature environments on the mechanical properties of 6061T651 aluminum were analyzed. From the data obtained at the yield and ultimate points a yield and ultimate model was developed based upon the parameters effective stress, effective strain, and the hydrostatic component of stress. This model was obtained solely from the data acquired from uniaxial tensile specimen tested at various pressures and temperatures. Two other loading pathsbiaxial tension and torsionwere then used to verify the accuracy of the model. From the testing program, data were also obtained ...
Numerical Simulation Of Heat, Mass, And Momentum Transfer In An Atmospheric Boundary Layer, Darrell W. Pepper
Numerical Simulation Of Heat, Mass, And Momentum Transfer In An Atmospheric Boundary Layer, Darrell W. Pepper
Doctoral Dissertations
"Considerable interest has developed in recent years to understand transport phenomena in thermally stratified boundary layers. More complete knowledge in this field is needed to improve the prediction of the diffusion of air pollutants in the lower atmosphere as well as in forecasting airwater circulation for weather conditions.
The atmospheric boundary layer is modeled using the equations of continuity, momentum, energy, and concentration. Closure of this set of partial differential equations is hindered by the turbulence terms. Using turbulence kinetic energy, the system of equations is closed by internally determining the exchange coefficients of heat, mass, and momentum along with ...
A Study Of The Dynamic Loading Of Hydrodynamically Lubricated Journal Bearings, Nader Khorzad
A Study Of The Dynamic Loading Of Hydrodynamically Lubricated Journal Bearings, Nader Khorzad
Doctoral Dissertations
"The analytical and experimental investigation presented here examined the response of a full journal bearing to a unidirectional dynamic load. Frequency response of the bearing at different eccentricity ratios was investigated. It was concluded that the response of the bearing varies with eccentricity. The experimental data obtained was compared to an analytical model which considered inertial, damping, and elastic characteristics of the lubricant film. An investigation of film pressure revealed that the pressure due to journal center acceleration is smaller than the hydrodynamic and squeezefilm pressures"Abstract, page 1.
Transient State Analysis Of Separated Flow Around A Sphere, ChingLiang Lin
Transient State Analysis Of Separated Flow Around A Sphere, ChingLiang Lin
Doctoral Dissertations
"Transient state solution of the Navier Stokes equation was obtained for incompressible flow around a sphere accelerating from zero initial velocity to its terminal free falling velocity. By assuming rotational symmetry around the axis in the falling direction, the Navier Stokes equation and the continuity equation were simplified in terms of vorticity and stream function. The instantaneous acceleration of the falling sphere was calculated by considering the difference between the gravitational force and the drag force in a transient state. The governing partial differential equations were nondimensionalized. A set of implicit finite difference equations was developed. In order to obtain ...
Stability Of The Developing Laminar Flow In A Circular Tube, LungMau Huang
Stability Of The Developing Laminar Flow In A Circular Tube, LungMau Huang
Doctoral Dissertations
"An investigation is made of the linear stability of the developing laminar flow of an incompressible fluid in the entrance region of a circular tube. Both axisymmetric and nonaxisymmetric small disturbances are considered in the analysis. The stability characteristics of the fully developed flow are also reexamined. The main flow velocity distribution used in the stability analysis is that from the solution of the linearized momentum equation. The governing equations for the disturbances and the boundary conditions constitute an eigenvalue problem which is solved by a direct numerical integration scheme along with an iteration technique. The solution starts with a ...
An Investigation Of Combined Thermal Weakening And Mechanical Disintegration Of Hard Rock, George Bromley Clark, T. F. Lehnhoff, Vernon Dale Allen, Mahendrakumar Ramkrishna Patel
An Investigation Of Combined Thermal Weakening And Mechanical Disintegration Of Hard Rock, George Bromley Clark, T. F. Lehnhoff, Vernon Dale Allen, Mahendrakumar Ramkrishna Patel
Mining Engineering Faculty Research & Creative Works
"The research under modified Contract No. H0220068 has been devoted to experimental thermalmechanical fragmentation of Missouri red granite in place, and to supporting theoretical analyses. The results of the previous year's experimental work showed that thermal stresses are several times more effective in fragmenting hard rock when they are created within the rock rather than upon the surface. Also, large blocks {4foot cubes) are not adequate to simulate the response of in situ rock.
Based upon laboratory tests an experimental round was designed analogous to an explosive blasting round with coiled wire heating elements placed in drill holes. Three ...