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Methods For Creating A Multi-Axis Polarizer For Visible Light Attenuation By Linear Translation, Peter L. Donatelli
Methods For Creating A Multi-Axis Polarizer For Visible Light Attenuation By Linear Translation, Peter L. Donatelli
Graduate Theses, Dissertations, and Problem Reports
A few solutions exist that describe how a Linear Translation Multi-Axis (LTMA) polarizer can be made. It is the purpose here to describe some of these solutions and determine if these solutions are plausible. A positive result will be the creation of a LTMA polarizer in a continuous sheet.;As there are various ways to make a LTMA polarizer, there are also many materials used to make polarizers. Some of the types of polarizers that will be discussed consist of: a crystalline based dichroic polarizer, a molecular iodine polarizer, birefringent polarizers, metallic polarizers and light reactive dye polarizers.;What has resulted from …
Influence Of A Thermal Denuder On Diesel Exhaust Particle Size Distributions, Bobby John
Influence Of A Thermal Denuder On Diesel Exhaust Particle Size Distributions, Bobby John
Graduate Theses, Dissertations, and Problem Reports
Particle size distributions in diesel exhaust were studied using a thermal desorption technique to determine the volatile and non-volatile fractions. A thermal denuder was designed and characterized for optimal operating parameters and its influence on the exhaust chemistries studied using diesel engine exhaust. The study was conducted on a 1992 DDC Series 60 engine mounted on a heavy-duty direct current dynamometer and exercised over steady state and transient cycles. The particle size distributions were recorded upstream and downstream of the denuder maintained at different temperatures to determine the behavior of the volatile fraction. The volatilization technique was also applied to …
The Design Of A Rotor Blade Test Facility, Jason W. Gill
The Design Of A Rotor Blade Test Facility, Jason W. Gill
Graduate Theses, Dissertations, and Problem Reports
The Mechanical and Aerospace Engineering Department has developed a need for test facilities related to rotorcraft, specifically facilities capable of testing scaled rotorcraft models and experimental propellers and rotors. A design was completed to fill these needs.;The design included several factors; aerodynamic conditions during operation, flexibility of application, ease and cost of construction, and safety. The aerodynamic conditions involved in the testing of rotors or propellers in static conditions were investigated. Other testing involving downwash impingement on wings was considered and incorporated into the design.;In addition, the design of the power transmission components was completed. This included the power requirements …
Design, Construction And Initial Testing Of Experimental Test Package For Convective Spray Cooling In Terrestrial Gravity Conditions, Charles Andy Hunnell
Design, Construction And Initial Testing Of Experimental Test Package For Convective Spray Cooling In Terrestrial Gravity Conditions, Charles Andy Hunnell
Graduate Theses, Dissertations, and Problem Reports
The design and construction of an apparatus for spray cooling tests was completed to better understand the effects of spray cooling with different geometries at varied flow rates and different spray orientations. Three different geometries were studied at four different spray volumetric flow rates varying from 9.3 GPH to 4.6 GPH. At each spray flow rate the heat flux of the small heated pedestal located in the spray chamber was increased from 5 W/cm2 to 32.24 W/cm2. During these tests the spray orientation was changed from a vertical downward spray to a horizontal spray. The convective heat transfer coefficient and …
Electromagnetic Nondestructive Inspection Of Aircraft Structures By Using A Magnetic Flux Leakage Method, Iyad Mahmood Ali Muslih
Electromagnetic Nondestructive Inspection Of Aircraft Structures By Using A Magnetic Flux Leakage Method, Iyad Mahmood Ali Muslih
Graduate Theses, Dissertations, and Problem Reports
Aging of aircraft structures is mostly associated with fatigue cracking, de-bonding and corrosion. Detection and characterization of the structural defects at the initiation stages makes it a great challenge for any inspection technology. This study proposes a new solution for the nondestructive evaluation problem by using a magnetic flux method for non-ferromagnetic materials and provides a new neural network tool that predicts crack profiles in three dimensions by solving the inverse problem, where available neural networks can solve it in two dimensions only.;The discontinuity resulting from a crack produces disturbance to the distribution of electrical current density in the structure …
Investigation Of Relative Humidity And Induced-Vortex Effects On Aircraft Icing, Egemen O. Ogretim
Investigation Of Relative Humidity And Induced-Vortex Effects On Aircraft Icing, Egemen O. Ogretim
Graduate Theses, Dissertations, and Problem Reports
Aircraft icing is an area of research that has drawn attention since the early times of powered flight at high altitudes. Since World War II, aircraft icing research has gained a great deal of momentum, and several branches of research have developed as a result. These branches include the experimental, analytical and computational methods. With the advent of high-speed computers, the computational methods are becoming the leading icing research area due to their low cost requirements. However, a significant hindrance is the lack of a complete understanding of the icing phenomena, which leads to discrepancies between the predictions and the …
Comparison Of Numerical Simulation To Existing Experimental Data Involving Downwash Wake Reduction For The V-22 Osprey, Brian O'Hara
Comparison Of Numerical Simulation To Existing Experimental Data Involving Downwash Wake Reduction For The V-22 Osprey, Brian O'Hara
Graduate Theses, Dissertations, and Problem Reports
It is of interest to develop numerical techniques to simulate the implementation of blowing slots on a V-22 Osprey airfoil in order to alleviate downwash. In order to develop these techniques, two separate experiments were simulated and the numerical results were compared with the experimental data. The first experiment used in comparison was performed by Fort F. Felker at the NASA's AMES Research Center in 1990. The second experiment was done by Chad Riba and Gerald M. Angle at West Virginia University in 2003.;The commercially available RNG k-e turbulence model with enhanced wall treatment found in Fluent 6.1 was used …
The Effect Of Adding Multiple Triangular Vortex Generators On The Leading Edge Of A Wing, Francisco Adolfo Pino Romainville
The Effect Of Adding Multiple Triangular Vortex Generators On The Leading Edge Of A Wing, Francisco Adolfo Pino Romainville
Graduate Theses, Dissertations, and Problem Reports
The goal of this research was to investigate preliminary test data obtained by Professor Robert E. Bond at the University of Tennessee in the year 2001. Dr. Bond added triangular horizontal flat plates (vortex generators) to the leading edge of a wing, to delay flow separation at high angles of attack. The present approach was both experimental and computational. The experimental method was used to determine, with the aid of smoke, the angle of attack at which the wing stalled. For this qualitative method a wing (airfoil NACA 0015) was used. It had a 32 inch span and attached to …