Measuring Pilot Control Force In General Aviation: Strain Gauges And Load Cell,
2020
Florida Institute of Technology
Measuring Pilot Control Force In General Aviation: Strain Gauges And Load Cell, Benjamin David Wyma
Theses and Dissertations
Flight test requires a variety of sensors and data systems to accurately read variables on an aircraft during testing. One of these important variables is the pilots control force. Control force is used in many tests in flight test to ensure the aircraft being tested meets the required FAA standards. One essential test is stick free longitudinal stability where control force is needed to calculate the stick free neutral points of the aircraft [1]. The objective of the project was to explore two methods of electronically measuring control force and determining which method is best suited for Florida Institute of …
Existence Of Ballistic Capture Transfer Trajectories From Trans-Lunar Injection To Lunar Polar Orbit For All Lunar Phases At Time Of Departure,
2020
Florida Institute of Technology
Existence Of Ballistic Capture Transfer Trajectories From Trans-Lunar Injection To Lunar Polar Orbit For All Lunar Phases At Time Of Departure, Anthony Lawrence Genova
Theses and Dissertations
This dissertation reveals several families of trajectories that can reduce the change in velocity(ΔV) required to transfer from trans-lunar injection (TLI) to a lunar polar circular orbit with 100 km altitude by up to 26.5% compared to conventional transfers. The primary hypothesis states that such trajectories, termed lunar polar ballistic capture (LPBC) transfers, exist for all lunar phases at the time of lunar departure (i.e., initial lunar flyby).The existence of LPBC transfers for all lunar phases can enable missions with ride-share restrictions (CubeSat), limited propellant capability (small spacecraft), and/or payloads that are not time sensitive (cargo).Evidence to support the primary …
Assessing Observer Stations For Cislunar Space Domain Awareness,
2020
Air Force Institute of Technology
Assessing Observer Stations For Cislunar Space Domain Awareness, Michael S. Rosenof
Theses and Dissertations
With renewed worldwide interest in cislunar space, the need for reliable domain awareness in that extended region of space is clear. This investigation quantifies the suitability of several possible stations for observer satellites in cislunar space by calculating the specific irradiance each would observe as they track satellites in various realistic lunar free-return trajectories across a decade, using reflected sunlight. This investigation includes one class of free return trajectories for target satellites, eleven distinct observer stations, and three different metrics for comparing the effectiveness of each observer station or combination of observer stations for sensing targets using reflected sunlight. The …
Experimental And Computational Analysis Of Progressive Failure In Bolted Hybrid Composite Joints,
2020
Air Force Institute of Technology
Experimental And Computational Analysis Of Progressive Failure In Bolted Hybrid Composite Joints, John S. Brewer
Theses and Dissertations
Composite materials are strong, lightweight, and stiff making them desirable in aerospace applications. However, a practical issue arises with composites in that they behave unpredictably in bolted joints, where damage and cracks are often initiated. This research investigated a solution to correcting the problem with composite bolted joints. A novel hybrid composite material was developed, where thin stainless steel foils were placed between and in place of preimpregnated composite plies during the cure cycle to reinforce stress concentrations in bolted joints. This novel composite was compared to control samples experimentally in quasi-static monotonic loading in double shear configuration in 9-ply …
Electro-Optic Satellite Constellation Design Using Multi-Objective Genetic Algorithm,
2020
Air Force Institute of Technology
Electro-Optic Satellite Constellation Design Using Multi-Objective Genetic Algorithm, Yasin Tamer
Theses and Dissertations
Satellite constellation design is a complex, highly constrained, and multidisciplinary problem. Unless optimization tools are used, tradeoffs must be conducted at the subsystem level resulting in feasible, but not necessarily optimal, system designs. As satellite technology advances, new methods to optimize the system objectives are developed. This study is based on the development of a representative regional remote sensing constellation design. This thesis analyses the design process of an electrooptic satellite constellation with regional coverage considerations using system-level optimization tools. A multi objective genetic algorithm method is used to optimize the constellation design by utilizing MATLAB and STK integration. Cost, …
Test And Evaluation Of An Artec Leo 3d Scanner,
2020
Florida Institute of Technology
Test And Evaluation Of An Artec Leo 3d Scanner, Chelsea Alexis Reichard
Theses and Dissertations
With new and innovative technologies, companies have begun utilizing 3-Dimensional Scanners to reverse engineer objects of virtually any size or complexity. These scanners increase efficiency, allowing companies to import physical items into the computer without the hassle of modeling it themselves in Computer Aided Design (CAD) software. Although these highly advanced devices can be very fast and effective, we will be studying the surfaces that are incompatible to these scanners. The study performed in this research will test the limitations of a new, highly advanced, wireless 3D Scanner; The Artec Leo. For many scanners, including the one used in this …
Specifying Space Defense Operator Interfaces Through The Application Of Cognitive Systems Engineering And Prototyping,
2020
Air Force Institute of Technology
Specifying Space Defense Operator Interfaces Through The Application Of Cognitive Systems Engineering And Prototyping, Justin E. Oryschak
Theses and Dissertations
The Department of Defense needs better tools to support its operators as they strive to defend its space assets. The growing sophistication of anti-satellite weapons increasingly challenges the nation’s orbital communications and surveillance infrastructure. Operators face difficulties gathering useful information and dealing with the complexity of potential enemy actions. This research applied cognitive systems engineering and ecological interface design (EID) methodologies to create a prototype space mission management tool that enhances operator situation awareness and decision-making ability. Applied cognitive task analysis interviews were used to document space operator decision-making in their domain. Model-based systems engineering was applied to integrate work …
Hexakis Icosahedron Frame-Skin Vacuum Lighter Than Air Vehicle,
2020
Air Force Institute of Technology
Hexakis Icosahedron Frame-Skin Vacuum Lighter Than Air Vehicle, Brian Cranston, Anthony N. Palazotto
AFIT Patents
A vacuum lighter than air vehicle (VLTAV) includes a rigid frame of rods connected together to form a hexakis icosahedron. A membrane skin covers the rigid frame and defines therewith a vessel configured to hold an internal vacuum that allows the vessel to float in the air. The plurality of rods and membrane skin have weights and dimensions that result in a neutral and/or positive buoyancy for the vessel while preventing geometric instability.
Advanced Concepts For Multiengine Airplane Flying,
2020
Minnesota State University, Mankato
Advanced Concepts For Multiengine Airplane Flying, Nihad E. Daidzic
Aviation Department Publications
FAA Safety Webinar (GL15102159) held online at 9:00 CST on Saturday, November 21, 2020.
An Investigative Study Of Combustion And Emissions With Noise And Vibrations Of Synthetic Fuels Within An Aero-Gas Turbine,
2020
Georgia Southern University
An Investigative Study Of Combustion And Emissions With Noise And Vibrations Of Synthetic Fuels Within An Aero-Gas Turbine, Camille J. Phillips
Honors College Theses
The pollution from the aerospace transportation is rapidly becoming the largest source of greenhouse gas (GHG) emissions. The FAA expects aviation emissions to almost triple by 2050, making the aerospace industry responsible for the release of approximately 25% of the global carbon dioxide budget. These aviation emissions, including CO2 and NOx, as well as other GHGs, contribute to the destruction of ozone layer. Carbon dioxide emissions have a particularly negative effect on humans, leading to airway diseases especially in children and elderly. To combat the addition of further GHG emissions into the atmosphere, it is necessary to minimize the usage …
A Ranking Method To Prioritize Vfr Airports To Be Provided With Instrument Approach Procedures,
2020
Embry-Riddle Aeronautical University
A Ranking Method To Prioritize Vfr Airports To Be Provided With Instrument Approach Procedures, Marcelo Soares Leao, Gustavo A.M. Ortegal Leal, Fabio Rodrigues Paukoski Fernandes
Graduate Student Works
The primary purpose of this work is to investigate the necessity of a more comprehensive and systematic method to prioritize airports to be provided with instrument approach and landing procedures in the Brazilian air transportation landscape. An overview of the main contributors to risks associated with the approach and landing phases is provided, covering the most important aspects of unstable approaches and CFIT events. Considering the emergence of Terrain Awareness and Alerting Systems (TAWS), the role of its contribution to safety is discussed, as well as the certification context related to the design, installation, and operation of those systems. A …
Efficient Yield Estimation Of Multiband Patch Antennas By Polynomial Chaos-Based Kriging,
2020
Missouri University of Science and Technology
Efficient Yield Estimation Of Multiband Patch Antennas By Polynomial Chaos-Based Kriging, Leifur Leifsson, Xiaosong Du, Slawomir Koziel
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Yield estimation of antenna systems is important to check their robustness with respect to the uncertain sources. Since direct Monte Carlo sampling of accurate physics-based models can be computationally intensive, this work proposes the use of the polynomial chaos–Kriging (PC-Kriging) metamodeling method for fast yield estimation of multiband patch antennas. PC-Kriging integrates the polynomial chaos expansion (PCE) as the trend function of Kriging metamodel since the PCE is good at capturing the function tendency and Kriging is good at matching the observations at training points. The PC-Kriging method is demonstrated on two analytical cases and two multiband patch antenna cases …
Model Based Systems Engineering For A Venture Class Launch Facility,
2020
Old Dominion University
Model Based Systems Engineering For A Venture Class Launch Facility, Walter Mcgee Taraila
Mechanical & Aerospace Engineering Theses & Dissertations
A study of Model-Based Systems Engineering (MBSE) applied to a small-lift launch facility is presented. The research uses Systems Modeling Language (SysML) products and functional diagrams to document the structure, controls, electrical power, hydraulic, safety mechanisms, software, and fluid ground systems on a launch pad. The research is motivated by the need to design complex systems with an unambiguous understanding that improves communication, quality, productivity, and reduces risk. A model is developed following the ISO/IEC-15288 technical process framework. The stakeholder requirements are defined and analyzed to provide traceability to individual systems and subsystems. An architectural design is realized and implemented …
Effect Of Cold Work Expansion On The Fatigue Life Of Pre-Cracked Al 2024-T3,
2020
Embry-Riddle Aeronautical University
Effect Of Cold Work Expansion On The Fatigue Life Of Pre-Cracked Al 2024-T3, Christopher Leirer
Doctoral Dissertations and Master's Theses
No abstract provided.
Geomagnetic Aided Dead-Reckoning Navigation,
2020
Embry-Riddle Aeronautical University
Geomagnetic Aided Dead-Reckoning Navigation, Andrei Cuenca
Doctoral Dissertations and Master's Theses
The dependence of modern navigation methods on global positioning systems has led to developing alternative algorithms for localization, capable of providing reliable and robust estimations. Global position system is commonly used in a vast majority of the world’s devices, and it can supply real time position and velocity information. However, its accuracy can be compromised by external operational effects such as signal availability, cyber-attacks or weather conditions. This thesis investigates an alternative approach to enhance navigation in GPS-denied environments. Particularly, it develops an integrated navigation architecture based on geomagnetic referencing models capable of dead reckoning at GPS denied intervals. A …
Study Of Control Schemes For Series Hybrid-Electric Powertrain For Unmanned Aerial Systems,
2020
Louisiana State University at Baton Rouge
Study Of Control Schemes For Series Hybrid-Electric Powertrain For Unmanned Aerial Systems, Darren A. Dehesa Jr
LSU Master's Theses
Hybrid-Electric aircraft powertrain modeling for Unmanned Aerial Systems (UAS) is a useful tool for predicting powertrain performance of the UAS aircraft. However, for small UAS, potential gains in range and endurance can depend significantly on the aircraft flight profile and powertrain control logic in addition to the subsequent impact on the performance of powertrain components. Small UAS aircraft utilize small-displacement engines with poor thermal efficiency and, therefore, could benefit from a hybridized powertrain by reducing fuel consumption. This study uses a dynamic simulation of a UAS, representative flight profiles, and powertrain control logic approaches to evaluate the performance of a …
Enhancement Of Fracture Toughness In Secondary Bonded Cfrp Using Hybrid Thermoplastic/Thermoset Bondline Architecture,
2020
Missouri University of Science and Technlogy
Enhancement Of Fracture Toughness In Secondary Bonded Cfrp Using Hybrid Thermoplastic/Thermoset Bondline Architecture, A. Yudhanto, M. Almulhim, F. Kamal, R. Tao, L. Fatta, M. Alfano, G. Lubineau
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Structures made of carbon fiber-reinforced polymer (CFRP) can be assembled using adhesive bonding. However, such bonding is prone to brittle delamination, and a method to improve delamination resistance is desirable. Here, we propose a technique to introduce crack-arrest features that increase the R-curve response by engineering the adhesive bond line/interface. We specifically designed a wavy net-like thermoplastic insert that was embedded into the thermoset adhesive bond line where the new mechanisms of energy dissipation were generated. We demonstrate that the technique is effective at improving mode I fracture toughness of secondary bonded carbon/epoxy by more than 400%. The hybrid thermoset/thermoplastic …
Finite-Time State Estimation For An Inverted Pendulum Under Input-Multiplicative Uncertainty,
2020
Embry-Riddle Aeronautical University
Finite-Time State Estimation For An Inverted Pendulum Under Input-Multiplicative Uncertainty, Sergey V. Drakunov, William Mackunis, Anu Kossery Jayaprakash, Krishna Bhavithavya Kidambi, Mahmut Reyhanoglu
Publications
A sliding mode observer is presented, which is rigorously proven to achieve finite-time state estimation of a dual-parallel underactuated (i.e., single-input multi-output) cart inverted pendulum system in the presence of parametric uncertainty. A salient feature of the proposed sliding mode observer design is that a rigorous analysis is provided, which proves finite-time estimation of the complete system state in the presence of input-multiplicative parametric uncertainty. The performance of the proposed observer design is demonstrated through numerical case studies using both sliding mode control (SMC)- and linear quadratic regulator (LQR)-based closed-loop control systems. The main contribution presented here is the rigorous …
Finite-Time State Estimation For An Inverted Pendulum Under Input-Multiplicative Uncertainty,
2020
Embry-Riddle Aeronautical University
Finite-Time State Estimation For An Inverted Pendulum Under Input-Multiplicative Uncertainty, William Mackunis, Sergey V. Drakunov, Anu Kossery Jayaprakash, Krishna Bhavithavya Kidambi, Mahmut Reyhanoglu
Publications
A sliding mode observer is presented, which is rigorously proven to achieve finite-time state estimation of a dual-parallel underactuated (i.e., single-input multi-output) cart inverted pendulum system in the presence of parametric uncertainty. A salient feature of the proposed sliding mode observer design is that a rigorous analysis is provided, which proves finite-time estimation of the complete system state in the presence of input-multiplicative parametric uncertainty. The performance of the proposed observer design is demonstrated through numerical case studies using both sliding mode control (SMC)- and linear quadratic regulator (LQR)-based closed-loop control systems. The main contribution presented here is the rigorous …
Maximum Evaporating Flux Of Molecular Fluids From A Planar Liquid Surface,
2020
Missouri University of Science and Technology
Maximum Evaporating Flux Of Molecular Fluids From A Planar Liquid Surface, Eric Bird, Zhi Liang
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In This Work, We Use the Kinetic Theory of Gases (KTG) to Develop a Theoretical Model to Understand the Role of Internal Motions of Molecules on the Maximum Evaporation Flux from a Planar Liquid Surface. the Kinetic Theory is Applied to Study the Evaporation of Molecular Fluids into a Vacuum and Predict the Dimensionless Maximum Evaporation Flux (JR,max, I.e., the Ratio of the Maximum Evaporation Flux to the Molar Flux Emitted from a Liquid Surface). the Key Assumptions Regarding the Velocity Distribution Function (VDF) of Polyatomic Molecules in the Highly Nonequilibrium Vapor Near the Evaporating Surface Are Validated by the …
