Aerospace Engineering Commons^™

Improving The Impingement Cold Plate Thermal Design Using Numerical And Analytical Approach, Reuben Joshua Madhuker

Mechanical and Aerospace Engineering Theses - Archive

Conventional cooling methods for an IC chip uses heat spreader to transfer heat from the chip end of the spreader to the opposite end of the spreader which then uses air or water to remove heat and thereby maintaining the overall temperature. Unfortunately, the heat spreader itself has constraints such as conduction resistance which adds the heat spreader inefficiency. But if we increase the area exposed to the cooling end then this can be improved. This is done by introducing channels at that end. These channels act as fins which give a better shot at cooling the system temperature. These …

Plasma Aerodynamics: Experimental Quantification Of The Lift Force Generated On An Airfoil Using Plasma Actuation To Estimate Power Requirements In Small Uav Applications, Getachew Ashenafi

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research addressed the amount of electric power required to induce specific changes in lift force using a NACA 2127 airfoil with a chord length of ~28 mm, connected to a micro load cell, in a wind tunnel of 103 square centimeter cross-section. A DBD plasma actuator supplied by a ZVS driven high voltage pulsed DC circuit, operating at a frequency of 17.4 kHz, was utilized for voltages of up to 5000 V. Two configurations of electrode gapping were compared to determine the efficient use of power. The configuration with a gap of ~1 mm between the upstream and downstream …

Air Traffic Controllers’ Occupational Stress And Performance In The Future Air Traffic Management, Hui Wang

Doctoral Dissertations and Master's Theses

As demand for unmanned aerial vehicle (UAV) operations increases, it is vital to understand its effects on air traffic controllers and the safety of the national airspace system. This study’s primary purpose is to determine how UAVs that operate in controlled airspace would influence air traffic controllers’ occupational stress and performance. In a within-subject experimental research design, 24 participants sampled from a university’s undergraduate Air Traffic Management (ATM) program completed three different air traffic control (ATC) scenarios on an en route ATC simulation system. The degree of UAV automation and control were varied in each scenario. The participants’ stress levels, …

Computational Investigation Of Perforated Plate Film Cooling Utilizing Conjugate Heat Transfer, Jonathan Sippel

Doctoral Dissertations and Master's Theses

The accuracy of modern state-of-practice computational fluid dynamics approaches in predicting the cooling effectiveness of a perforated plate film-cooling arrangement is evaluated in ANSYS Fluent. A numerical investigation is performed using the Reynolds Averaged Navier Stokes equations and compared to NASA Glenn’s available Turbulent Heat Flux 4 experimental measurements collected as a part of the Transformational Tools and Technologies Project. A multiphysics approach to model heat conduction through the solid geometry is shown to offer significant improvements in wall temperature and film effectiveness prediction accuracy over the standard adiabatic wall approach. Additionally, localized gradient-based grid adaption is analyzed using the …

Adaptive Control For Nonlinear, Time Varying Systems, John Zelina

Doctoral Dissertations and Master's Theses

It is common for aerospace systems to exhibit nonlinear, time varying dynamics. This thesis investigates the development of adaptive control laws to stabilize and control a class of nonlinear, time varying systems. Direct adaptive control architectures are implemented in order to compensate for time varying dynamics that could, for example, be caused by varying inertia resulting from fuel slosh or settling in a tank. The direct adaptive controller can also respond to external disturbances and unmodeled or nonlinear dynamics. Simulation results are presented for a prototype system that consists of two rotating tanks with time varying inertia due to the …

Analysis Of Ship Airwakes Using Modal Decomposition, Nicholas Zhu

Doctoral Dissertations and Master's Theses

The three-dimensional, unsteady, and turbulent airwake produced by a scaled model of a generic Navy ship (Simple Frigate Shape No. 2) was investigated in a low-speed wind tunnel. Stereoscopic, time-resolved particle image velocimetry (TR-PIV) measurements were made at six different crosswise planes over the flight deck region of the ship model, with and without the effect of a simulated atmospheric boundary layer (ABL).

Spatiotemporal analyses of the TR-PIV measurements were performed using modal decomposition, and the modes were decomposed further based on the frequency contents of their time dynamics. This approach allowed an inspection of the individual scales of the …

Data-Driven Architecture To Increase Resilience In Multi-Agent Coordinated Missions, D. F.

Doctoral Dissertations and Master's Theses

The rise in the use of Multi-Agent Systems (MASs) in unpredictable and changing environments has created the need for intelligent algorithms to increase their autonomy, safety and performance in the event of disturbances and threats. MASs are attractive for their flexibility, which also makes them prone to threats that may result from hardware failures (actuators, sensors, onboard computer, power source) and operational abnormal conditions (weather, GPS denied location, cyber-attacks). This dissertation presents research on a bio-inspired approach for resilience augmentation in MASs in the presence of disturbances and threats such as communication link and stealthy zero-dynamics attacks. An adaptive bio-inspired …

On The Computational Efficiency Of Les And Hybrid Rans-Les Models In Building Aerodynamics, Faiaz Khaled, Aly Mousaad Aly

Faculty Publications

No abstract provided.

Characterizing High Entropy Alloys For Hypersonic Applications, Katherine Pettus

Mechanical Engineering Undergraduate Honors Theses

In this paper, the properties of a new and broad class of materials, high entropy alloys (HEAs), were investigated and evaluated for hypersonic applications. The plan was to identify candidate hypersonic HEAs and model the high-temperature strength using new advanced material models that account for asymmetry and anisotropy characterized with available test data. After accessing a local database of HEAs and their material properties in collaboration with Dr. Gorsse et al., it was realized the knowledge of HEAs is currently very broad but lacks depth. While hundreds of HEAs have been created and tested, none so far have both sufficient …

Improving The Performance Of An Ead Aircraft By Use Of A Retractable Electrode System, Michael Alexander Fredricks

Mechanical Engineering Undergraduate Honors Theses

Electroaerodynamic (EAD) propulsion is a growing area of research for small, low powered aircraft. Recent tests of EAD aircraft have demonstrated low performance in unpowered, gliding flight. The purpose of this paper is to investigate the effect of a retractable electrode system on the flight performance of an EAD aircraft. An analysis of electrode drag contribution on the MIT ionic wind plane’s performance predicts a maximum lift to drag ratio of 22, with the addition of a retractable electrode system, for a similarly sized and modeled EAD aircraft. An experiment is developed using a prototype aircraft, launcher, and retraction system …

Foundations For The Coupled Inflow And Structural Dynamics Of Multi-Rotor Helicopters, Ethan Genter

McKelvey School of Engineering Graduate Student Theses & Dissertations

In this work, the Peters-Seidel finite-state model is expanded to calculate the coupled inflow and rotor dynamics of tandem rotor configurations. This establishes the foundation for a more complete multi-rotor, dynamic inflow model with finite-state methods. The derivation presented in this work is for the general case of two rotors in the same plane, overlapping and separated to varying degrees. It is the purpose of this work to study the unique and interesting dynamics and characteristics of various tandem systems heretofore not studied in a dynamic system. Moreover, it is the goal of this work to investigate how these systems …

Analytical Airflow Solution Of A Helicopter Engine Bay And Novel Bay Cooling Cowling Design, Daniel Evan Yastishock

Theses and Dissertations

The objective of this thesis is to develop an analytical-numerical solution for the engine bay cooling airflow in a representative helicopter based on the Augusta-Westland 101, and evaluate the performance of a novel rotating scoop cowling on the airflow. The methodology was created in PythonTM. Results obtained via the analytical method were compared against a CFD model constructed with Ansys® at a hover, 50 fps forward flight, and 250 feet per second forward flight using a k−ε turbulence model. Performance of the rotating scoop was compared to that of a conventional inlet orifice and fixed scoop in a similar airspeed …

Stability And Control Flight Testing Of The Dassault Falcon 10/100, Andres Mauricio Alarcon Vega

Theses and Dissertations

The Falcon 10/100 is a transport category aircraft developed by Dassault Aviation in 1971. Production of the aircraft ceased in 1989, but it remains available on the secondhand market. Certification for these types of aircraft follow FAR Part 25 of the code of federal regulations. Aircraft stability and control flying qualities are dependent on the mission profile and intended use case of the aircraft. External factors, such as turbulence, are relevant for transport category aircraft because poor stability could affect the flying characteristics and result in an unpleasant ride. On the other hand, in a trimmed condition, an aircraft with …

Development And Testing Of Nanostructured Materials For Extreme Environment Applications, Nanthakishore Makeswaran

Open Access Theses & Dissertations

Nanostructured materials have many potential applications in the fields of power generation and transportation technologies, particularly in the areas of gas sensing technology, industrial gas turbines and protective coatings. In the former case β-Ga2O3 represents a promising candidate due to its high degree of stability and functionality for oxygen sensing at higher temperatures (>700oC). In the latter case, the application of Y-Si-Fe compounds acting as environmental barrier coatings for gas turbine and aerospace engine applications to protect from corrosion effects has been demonstrated in recent years. In both cases, however, there is room for improvement whether it is in …

Scaling Laws For Fixed-Wing Single-Engine Electric Propulsion Systems, Fnu Hem Lata

Theses and Dissertations

The rise of new aircraft propulsion methods (e.g., powered by batteries, fuel cells, or hybrid electric systems), the increased use of automated and integrated flight control systems, and the envisioned use of personal Vertical Take-off and Landing (VTOL) vehicles in urban environments (urban aerial mobility) lead to novel technical and regulatory challenges for aircraft manufacturers, certification authorities and operators. Of primary concern are operational safety and closely connected pilot situation awareness and workload. The Trajectory Energy Management task involves manipulating flight and propulsion controls to achieve a planned flight profile. The key areas to focus on in Trajectory Energy Management …

Analysis On Fuel Options For Scramjet Engines With The Study To Lower The Starting Mach Number, Sumantra Luitel, Gagan Dangi

Honors Theses

The main objectives of this report were to perform analysis of an ideal scramjet engine, to assess the influence of fuel on endurance factor, and the possibility of lowering the starting Mach Number of the scramjet. In the first part, an ideal cycle parametric analysis was conducted on three different fuels i.e. Liquid Hydrogen (LH2), Jet Propellant 7 (JP-7), and Rocket Propellant (RP-1), taking into account their availability, physical properties, current uses, and potential uses. The detailed analysis is done largely relying on a 9 step Parametric Cycle Analysis technique to study how fuel properties influence the variation of seven …

2021 Spring Graduate Recognition Program, Propulsion Research Center, Robert Frederick

PRC Graduate Recognition

This program includes the graduate recognition program for spring 2021. Includes photographs, upcoming events, recent publications, and student profiles.

Computational Fluid Dynamics Benchmark Validation Experiment Of Plenum-To-Plenum Flow Through Vertical Heated Parallel Channels, Austin W. Parker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The next generation of nuclear power plants will have higher efficiency and improved safety, among other benefits; one attractive option is the high temperature gas reactor. An ability to predict the physics that occur within the reactor under normal conditions and accident scenarios is necessary before it receives regulatory licensing for use. The flow through a high temperature gas reactor involves complex interactions of heat transfer, fluids, and solids.

One method for simulating complex fluid dynamics is called Computational Fluid Dynamics. These simulations have already been used to predict the complex fluid flows found in high temperature gas reactors. Predicting …

Sensitivity And Estimation Of Aerodynamic, Propulsion, And Inertial Parameters For Rudderless Aircraft Using Simulation, Jaden W. Thurgood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A technique known as system identification is often used in aircraft design and testing to understand and validate the mathematical parameters that describe the aircrafts stability and handling characteristics. System identification can be thought of as the inverse of simulation. In the world of system identification, we have a physical system that we seek to understand in more detail by monitoring the system with an array of sensors. In short, we conduct tests of an aircraft while recording the inputs and response outputs. Then we take the input and output data and run it through an algorithm that seeks to …

Air Navigation And Covid-19: Atm Efficiency In Pandemic Crisis, Fabio Lourenco Carneiro Barbosa

Graduate Student Works

The coronavirus crisis effects on aviation in 2020 are currently well-documented. Nonetheless, the widely registered low traffic due to the crisis does not necessarily lead to increased air navigation efficiency. Thus, the present work, developed to fulfill the program outcomes for the Master of Science in Aeronautics, Air Traffic Management (ATM) specialization, aimed to investigate what was the impact of the COVID-19 crisis on air navigation efficiency in Brazil. This research question was addressed through a quantitative, nonexperimental, observational approach with two parallel branches, designed to answer two sub-questions. For the first, regarding what was the impact of the crisis …

Performance Profile Testing Of The Dassault Falcon 10/100, Thomas Henry Bolek Roman

Theses and Dissertations

The objective of the performance profile and flight testing comparison is to practice flight test theory on a turbofan-powered aircraft, compare results to Dassault published parameters, and give insight on how this may become a module for the flight test engineering program at Florida Tech. The performance experiments conducted were takeoff performance, level acceleration, level flight performance, stall speed, and roll performance. Takeoff distance was observed using the data from the Stratus ADSB receiver, which gave GPS coordinates; additionally, takeoff distance was measured via Google Earth from the start and the takeoff location observed by the co-pilot. The takeoff field …

Hydrogen/Diesel Co-Combustion In Compression Ignition Engines Through Hydrogen Ingestion And Direct Hydrogen Injection, Helge Hening Von Helldorff-Garn

Theses and Dissertations

This dissertation develops, implements, and validates the computational tools necessary for the computational simulation of hydrogen-enhanced Diesel combustion for premixed hydrogen charges ingested into the intake air and for direct injected hydrogen pilot charges into the cylinder. This includes a dual-fuel mechanism, a Lagrangian gaseous injection scheme, an improved spray particle breakup model, an advanced chemical kinetic reaction solver, as well as a complex n-heptane chemical kinetic reaction mechanism consisting of 35 species and 119 reversible reactions capable of describing both premixed and mixing controlled hydrogen/Diesel co-combustion at various fuel concentrations. The results showed that low levels of either hydrogen …

Sonic Boom Loudness Reduction Through Localized Supersonic Aircraft Equivalent-Area Changes, Troy A. Abraham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The NASA University Leadership Initiative (ULI) titled “Adaptive Aerostructures for Revolutionary Civil Supersonic Transportation” looks to study the feasibility of distributed structural adaptivity on a supersonic aircraft for maintaining acceptable en-route sonic boom loudness during overland flight. The ULI includes a team of industry and university partners that are working together to develop and implement the systems necessary to accomplish this goal.

The Utah State University Aerolab is a member of this ULI team and has been tasked with developing and using low-fidelity supersonic aerodynamic and sonic boom predictions tools to rapidly study the effects of localized geometry changes on …

Investigation Of Bio-Inspired Pin Geometries For Heat Transfer Applications, Anish Prasad

Doctoral Dissertations and Master's Theses

Array of circular cylindrical pins or tubes are one of the most widely used type of convection cooling systems, profoundly used in the internal cooling of gas turbine blades. They promote heat transfer due to flow acceleration, secondary flows and wake shedding, at the expense of large pressure loss and unsteadiness in the flow. The need to reduce pressure loss and maintain the heat transfer rates are a much needed requirement for a variety of industries to improve the cooling efficiency. One such prominent line of research is conducted on optimizing the design of the circular cylindrical pins to increase …

Nitinol Robotic Arm, Brandon Cousino, Connor Sweatt

Thinking Matters Symposium

The goal of our project is to create a remotely controlled robotic arm using a nickel-titanium alloy (Nitinol) that exhibits “shape memory” tendencies and a 9-lumen tube. The arm must be able to move in all for directions (forward, left, right, backwards) with the control of a joystick and return to an upright position upon halting user input (thus requiring a two-way shape memory ability). The final product must operate without any unwanted twisting of the arm, crosstalk between the different nitinol wires due to heating, and be easily manufacturable. Easy replacement of the arm from the main mechanism is …

Supplying Space: 3d Printing For Interplanetary Logistics, Jeffrey W. Rogers

Space Studies Student Publications

This case study examines 3-D printing as an effective solution to ensure just in time logistics capability for supporting a crewed colony on Mars. It explores the cost to weight benefits of an advanced shipment sent prior to the crewed mission to ensure on-planet production capacity on arrival and landing for sustained operations with limited resupply from Earth. In order to project a realistic and financially reasonable solution, a quantitative descriptive analysis method is utilized. Data was collected through text research and research tools provided from the United States Government (NASA) and private industry via internet sources. From correlated data, …

Low-Fidelity Method For Rapid Aerostructural Optimisation And Design-Space Exploration Of Planar Wings, Jeffrey D. Taylor, Doug F. Hunsaker

Mechanical and Aerospace Engineering Student Publications and Presentations

During early phases of wing design, analytic and low-fidelity methods are often used to identify promising design concepts. In many cases, solutions obtained using these methods provide intuition about the design space that is not easily obtained using higher-fidelity methods. This is especially true for aerostructural design. However, many analytic and low-fidelity aerostructural solutions are limited in application to wings with specific planforms and weight distributions. Here, a numerical method for minimising induced drag with structural constraints is presented that uses approximations that apply to unswept planar wings with arbitrary planforms and weight distributions. The method is applied to the …

Fear To Cooperation: A Brief History Of The Space Race, Dylan Clay

Undergraduate Research Conference at Missouri S&T

In 1957, the United States and the Soviet Union engaged in a space race that, ironically, resulted in joint United States-Soviet Union missions with the 1975 Apollo-Soyuz program. Starting in the 1950s, the Cold War between the two nations led to a feeling of unease from the world populace, especially with uncertainty surrounding the superpowers' capabilities. In the late 1950s, the United States feared that they would lose the race to space because of Sputnik's success, but American efforts led to far greater success with American Astronauts landing on the moon, effectively ending the race to space. With both nations …

White Paper Report: Needs In Space Education For The 21st Century—Research, Higher Education, Training And Public Policy, Randall Johnson, Joseph Pelton, Henry Hertzfeld, Don Flournoy, Hussein J. Hussein

Online Journal of Space Communication

May 2, 2003

A Forum Seeking Innovative Answers

• New Approaches to Higher Education and Training
• Distance Learning, Tele-education and the Internet
• Shared Research Facilities and New Approaches to Research
• Joint University Projects
• Multidisciplinary Needs and International Perspectives and Languages
• Space and Security Issues Related to Education
• How to Attract More Students to Higher Education in the Space Field
• How to Prepare Incoming Students More Effectively for College
• Wide Spread Survey on Space Education to Find Concerns and New Solutions

From The Industry: Yasunori Matogawa, Ph.D., Professor Of Space Communications At The Institute Of Space And Astronautical Science, Yasunori Matogawa

Online Journal of Space Communication

Dr. Yasunori Matogawa is Professor at the Institute of Space and Astronautical Science directly reporting to the Ministry of Education, Science, Culture, Sports and Technology. He is also in charge of supervising Kagoshima Space Center in Kyushu as Director General. Widely considered to be the man of space education in Japan, Dr. Matogawa is the President for the Japan Society for Aeronautical and Space Sciences. Internationally, he is well-known as the Chairman of the International Astronautical Federation. The interview was conducted at Sophia University, Japan with the assistance of Dr. Tsutomu Kanayama (Email: [email protected]).