Global Skin Friction Diagnostics: The Glof Technique And Measurements Of Complex Separated Flows,
2013
Western Michigan University
Global Skin Friction Diagnostics: The Glof Technique And Measurements Of Complex Separated Flows, Sudesh A. Woodiga
Dissertations
This work describes the application of the global luminescent oil film skin friction meter to quantitative global skin friction diagnostics of complex separated flows. The development of this technique is based on the relationship between the oil film thickness and luminescent intensity of a luminescent oil film. The projected thin oil film equation is given to relate the normalized luminescent intensity with skin friction. The variational formulation with a smoothness constraint on skin friction is proposed to obtain a snap shot solution from two consecutive images for a relative skin friction field. A complete skin friction field is reconstructed through …
Design And Analysis Of Reusable Nozzles For Cal Poly’S Hybrid Rocket Lab,
2013
California Polytechnic State University, San Luis Obispo
Design And Analysis Of Reusable Nozzles For Cal Poly’S Hybrid Rocket Lab, Cheyne Austin, Jose Vargas
Aerospace Engineering
Two nozzles were designed and constructed for testing in the Cal Poly propulsion laboratory to explore which nozzle was the most capable in producing the most thrust. A 15 degree and 30 degree converging-diverging nozzles were machined and tested. Theory suggest that a bell nozzle would be the most efficient since all of the gasses generated in the combustion chamber are directed and accelerated by the throat leave the nozzle traveling along the thrust axis. All of the momentum of the gasses are directed axially thus resulting in maximum thrust. Thrust should also be produced by the converging-diverging nozzle and …
Low-Cost Imu Implementation Via Sensor Fusion Algorithms In The Arduino Environment,
2013
California Polytechnic State University, San Luis Obispo
Low-Cost Imu Implementation Via Sensor Fusion Algorithms In The Arduino Environment, Brandon Mccarron
Aerospace Engineering
A multi-phase experiment was conducted at Cal Poly in San Luis Obispo, CA, to design a low-cost inertial measurement unit composed of a 3-axis accelerometer and 3-axis gyroscope. Utilizing the growing microprocessor software environment, a 3-axis accelerometer and 3-axis gyroscope simulated 6 degrees of freedom orientation sensing through sensor fusion. By analyzing a simple complimentary filter and a more complex Kalman filter, the outputs of each sensor were combined and took advantage of the benefits of both sensors to improved results. Gyroscopic drift was removed in the pitch and roll axes using the Kalman filter for both static and dynamic …
Micrometeoroid Fluence Variation In Critical Orbits Due To Asteroid Disruption,
2013
California Polytechnic State University, San Luis Obispo
Micrometeoroid Fluence Variation In Critical Orbits Due To Asteroid Disruption, Eliot Dan Aretskin-Hariton
Master's Theses
Micrometeoroids and orbital debris (MMOD) is a growing issue with international importance. Micrometeoroids are naturally occurring fragments of rock and dusk that exist throughout the solar system. Orbital debris is human made material like rocket bodies, paint flakes, and the effluent of spacecraft collisions. Even small MMOD particles on the order of 1 cm in diameter have the potential to destroy critical spacecraft systems. Because of this, MMOD is a threat to all spacecraft in orbit. Even governments that most sternly oppose US international policy have a stake when it comes to minimizing MMOD flux. Space-based assets are essential to …
Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform,
2013
California Polytechnic State University, San Luis Obispo
Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform, Jeffrey J. Maniglia Jr.
Master's Theses
This paper describes the changes made from Cal Poly’s initial railgun system, the Mk. 1 railgun, to the Mk. 1.1 system, as well as the design, fabrication, and testing of a newer and larger Mk. 2 railgun system. The Mk. 1.1 system is developed as a more efficient alteration of the original Mk. 1 system, but is found to be defective due to hardware deficiencies and failure, as well as unforeseen efficiency losses. A Mk. 2 system is developed and built around donated hardware from the Naval Postgraduate School. The Mk. 2 system strove to implement an efficient, augmented, electromagnetic …
Improvement Of Electromagnetic Railgun Barrel Performance And Lifetime By Method Of Interfaces And Augmented Projectiles,
2013
California Polytechnic State University, San Luis Obispo
Improvement Of Electromagnetic Railgun Barrel Performance And Lifetime By Method Of Interfaces And Augmented Projectiles, Aleksey D. Pavlov
Master's Theses
Several methods of increasing railgun barrel performance and lifetime are investigated. These include two different barrel-projectile interface coatings: a solid graphite coating and a liquid eutectic indium-gallium alloy coating. These coatings are characterized and their usability in a railgun application is evaluated. A new type of projectile, in which the electrical conductivity varies as a function of position in order to condition current flow, is proposed and simulated with FEA software. The graphite coating was found to measurably reduce the forces of friction inside the bore but was so thin that it did not improve contact. The added contact resistance …
Characterization Of The Effects Of A Sun-Synchronous Orbit Slot Architecture On The Earth's Orbital Debris Environment,
2013
California Polytechnic State University, San Luis Obispo
Characterization Of The Effects Of A Sun-Synchronous Orbit Slot Architecture On The Earth's Orbital Debris Environment, Connor David Noyes
Master's Theses
Low Earth orbit represents a valuable limited natural resource. Of particular interest are sun-synchronous orbits; it is estimated that approximately 44% of low Earth satellites are sun-synchronous. A previously developed sun-synchronous orbit slot architecture is considered. An in-depth analysis of the relative motion between satellites and their corresponding slots is performed. The long-term evolution of Earth's orbital environment is modeled by a set of coupled ordinary differential equations. A metric for quantifying the benefit, if any, of implementing a sun-synchronous architecture is developed. The results indicate that the proposed slot architecture would reduce the frequency of collisions between satellites in …
Uav Formation Flight Utilizing A Low Cost, Open Source Configuration,
2013
California Polytechnic State University, San Luis Obispo
Uav Formation Flight Utilizing A Low Cost, Open Source Configuration, Christian W. Lopez
Master's Theses
The control of multiple unmanned aerial vehicles (UAVs) in a swarm or cooperative team scenario has been a topic of great interest for well over a decade, growing steadily with the advancements in UAV technologies. In the academic community, a majority of the studies conducted rely on simulation to test developed control strategies, with only a few institutions known to have nurtured the infrastructure required to propel multiple UAV control studies beyond simulation and into experimental testing. With the Cal Poly UAV FLOC Project, such an infrastructure was created, paving the way for future experimentation with multiple UAV control systems. …
Fatigue Testing And Data Analysis Of Welded Steel Cruciform Joints,
2013
LSU New Orleans
Fatigue Testing And Data Analysis Of Welded Steel Cruciform Joints, Alina Shrestha
LSU New Orleans Theses and Dissertations
In this study, ABS Publication 115, “Guidance on Fatigue Assessment of Offshore Structures” is briefly reviewed. Emphasis is on the S-N curves based fatigue assessment approach of non-tubular joints, and both size and environment effects are also considered. Further, fatigue tests are performed to study the fatigue strength of load-carrying and non-load-carrying steel cruciform joints that represent typical joint types in marine structures. The experimental results are then compared against ABS fatigue assessment methods, based on nominal stress approach, which demonstrates a need for better fatigue evaluation parameter. A good fatigue parameter by definition should be consistent and should correlate …
Smaller Spacecraft For Education And Space Research,
2013
Morehead State University
Smaller Spacecraft For Education And Space Research, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Smaller spacecraft for education and space research" from May 14, 2013.
Middle Atmosphere Temperature Results From A New, High-Powered, Large-Aperture Rayleigh Lidar,
2013
Utah State University
Middle Atmosphere Temperature Results From A New, High-Powered, Large-Aperture Rayleigh Lidar, Leda Sox, Vincent B. Wickwar, Joshua P. Herron
Utah Space Grant Consortium
In June–July 2012, observations were carried out using the recently upgraded, large-aperture, Rayleigh-scatter lidar system located at the Atmospheric Lidar Observatory (ALO) on the campus of Utah State University, in Logan, UT (41.7 N, 111.8 W). This time period was significant because it enabled us to observe the annual temperature minimum in the upper mesosphere-lower thermosphere region. The data collected during the campaign were analyzed for temperatures between ~70–109 km. The results above ~95 km are the first obtained with a Rayleigh-scatter lidar, extending the technique well into the lower thermosphere. A great deal of variability from night-to-night is evident …
Monte Carlo Uncertainty Analysis For Photothermal Radiometry Measurements Using A Curve Fit Process,
2013
Utah State University - Faculty Advisor
Monte Carlo Uncertainty Analysis For Photothermal Radiometry Measurements Using A Curve Fit Process, Kyle Horne, Austin Fleming, Heng Ban
Utah Space Grant Consortium
Photothermal Radiometry (PTR) has become a popular method to measure thermal properties of layered materials. Much research has been done to determine the capabilities of PTR, but with little uncertainty analysis. This study performs a Monte Carlo uncertainty analysis to quantify uncertainty of film diffusivity and effusivity measurements, presents a sensitivity study for each input parameter, compares linear and logarithmic spacing of data points on frequency scans, and investigates the validity of a 1-D heat transfer assumption.
Establishing Mission Requirements Based On Consideration Of Aircraft Operations,
2013
California Polytechnic State University, San Luis Obispo
Establishing Mission Requirements Based On Consideration Of Aircraft Operations, Robert A. Mcdonald
Aerospace Engineering
The design requirements for a next-generation commercial aircraft can do much to secure its fate as a success or failure. New aircraft are often designed to meet or surpass the capabilities of an existing aircraft they are intended to replace. However, in the case of unconventional aircraft, this could lead to significant overdesign resulting in nonviable concepts. Instead, a method of analyzing observed aircraft use is presented with the intent of establishing a set of requirements based on replacing aircraft utility instead of capability. Two aircraft in the commercial fleet are used as example cases, and launch customers for each …
Section Abstracts: Aeronautical And Aerospace Sciences,
2013
Old Dominion University
Section Abstracts: Aeronautical And Aerospace Sciences
Virginia Journal of Science
Abstracts of the Aeronautical and Aerospace Sciences Section for the 91st Annual Virginia Journal of Science Meeting, May 2013
Analysis And Mitigation Of The Cubesat Dynamic Environment,
2013
California Polytechnic State University, San Luis Obispo
Analysis And Mitigation Of The Cubesat Dynamic Environment, Steve M. Furger
Master's Theses
A vibration model was developed for CubeSats inside the Poly-Picosatellite Orbital Deployer (P-POD). CubeSats are fixed in the Z axis of deployers, and therefore resonate with deployer peaks. CubeSats generally start fixed in the X and Y axes, and then settle into an isolated position. CubeSats do not resonate with deployers after settling into an isolated position. Experimental data shows that the P-POD amplifies vibration loads when CubeSats are fixed in the deployer, and vibration loads are reduced when the CubeSats settle into an isolated position. A concept for a future deployer was proposed that isolates CubeSats from the deployer …
Supersonic Turbine Cascade Studies Using Computational Fluid Dynamics And Water Table Experiments,
2013
University of Nevada, Las Vegas
Supersonic Turbine Cascade Studies Using Computational Fluid Dynamics And Water Table Experiments, Shelby E. Nelson
Honors College Theses
Design engineers use a variety of tools to perform calculations and to aid in the design process. For example, engineers designing gas turbines, specifically the aerodynamicists, use a combination of hand calculations, experimental data, and complex numerical codes to simulate air flow around each blade. Aerodynamicists designing gas turbines must predict the locations of the shocks to locate inefficiencies in the flow. In this thesis, three methods of calculating the shock angles are compared: analytical, experimental, and computational. Three different airfoil shapes are tested: a rectangular flat plate, a supersonic diamond, and a turbine airfoil. Cascade tests of the airfoil …
End-Of-Life Management Of Crystalline Silicon Photovoltaic Module,
2013
University of Dayton
End-Of-Life Management Of Crystalline Silicon Photovoltaic Module, Jun-Ki Choi
Mechanical and Aerospace Engineering Faculty Publications
PV manufacturing has been growing over the past 10 years and further annual growth of 15% is expected until 2020. A study on positioning a grand plan for solar power shows how vast PV arrays and other renewable energies can provide significant amount of electricity and total energy needs by 2050. Various new PV technologies have been introduced in the market and existing technologies have undergone further development. How all these developments will affect the fate of the end-of-life PV modules is uncertain. In addition, the market price of some rare earth materials utilized in the manufacturing of the various …
Application Of Archimedes In Three Dimensions And To Solid Mechanics,
2013
Syracuse University
Application Of Archimedes In Three Dimensions And To Solid Mechanics, Jonathan David Aziz
Renée Crown University Honors Thesis Projects - All
ARCHIMEDES is a computerized learning system that has helped Syracuse University students overcome the challenges of Engineering Statics since 2009. Its success has motivated application of ARCHIMEDES to three dimensional problems and to problems in Solid Mechanics. Other learning software was investigated before seven Solid Mechanics problems were written for ARCHIMEDES. A 3D graphical interface was developed and evaluated by a field test of student volunteers. Student preferences for various features in 3D learning software were obtained. It is clear from student responses that having a 3D scene to manipulate improves visualization of the problem, mitigating the ambiguity of a …
Deutsche Luftshiffahrts-Aktiengesellschaft: Rediscovering The World’S First Airline,
2013
Bridgewater State University
Deutsche Luftshiffahrts-Aktiengesellschaft: Rediscovering The World’S First Airline, Michael Sloan
Bridgewater Review
No abstract provided.
Application Of Non-Local Approaches For Predicting The Response Of V-Notch Under Thermomechanical Fatigue Loading,
2013
University of Central Florida
Application Of Non-Local Approaches For Predicting The Response Of V-Notch Under Thermomechanical Fatigue Loading, Trung Nguyen
HIM 1990-2015
The topic of this thesis is the construction of a formula to approximate stress-strain responses at notches under thermomechanical fatigue (TMF) loading. The understanding of material behavior of the V-notched component which experiences TMF is important to the mechanical industries where V-notched structures are often utilized. In such applications, it is crucial that the designers be able to predict the material behavior; therefore, the purpose of this research is to examine and to model the precise effects a stress concentration will have on a specimen made of a generic Ni-base superalloy. The effects of non-isothermal loading will be studied, and …
