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Articles 301 - 330 of 412
Full-Text Articles in Aviation
Turkish Air Mobility Modeling, Huseyin Topcuoglu
Turkish Air Mobility Modeling, Huseyin Topcuoglu
Theses and Dissertations
The aim of this research is to provide a tactical mobility model which is user friendly and flexible so the user is able to change the inputs, and evaluate the situation with the projected data for an operational plan. Thus, the users can analyze their system by using the model to see whether or not mobility requirements can be met within a definite time frame, and how long it takes to satisfy the requirements. Generalized Air Mobility Model (GAMM) was chosen to model TAMC's airlift system and has been found suitable for application to TUAF mobility problems. The software enables …
C-17/Paratrooper Risk Assessment Analysis, Jose C. Belano
C-17/Paratrooper Risk Assessment Analysis, Jose C. Belano
Theses and Dissertations
The C-17 test and evaluation community has been testing different aircraft formation geometries in search of a configuration which minimizes paratrooper encounter with the wake vortices of upstream aircraft. This thesis develops a simulation tool that the C-17 test and evaluation community can utilize as an advanced risk assessment model to use on proposed formation geometries prior to live testing. The model is developed under the architecture of object-oriented simulation using MODSIM III and parallels similar efforts by the Aerodynamic Decelerator Technology community in creating object-oriented counterparts to already developed trajectory models of various degrees of freedom. This thesis develops …
The Effects Of Elevator Rate Limiting And Stick Dynamics On Longitudinal Pilot-Induced Oscillations, Patrick J. Peters
The Effects Of Elevator Rate Limiting And Stick Dynamics On Longitudinal Pilot-Induced Oscillations, Patrick J. Peters
Theses and Dissertations
This report presents the results of an investigation into the effects of elevator rate limiting and stick dynamics on longitudinal pilot-induced oscillations (PIO). A simulation study was conducted to prepare for the flight test, but also to gain insight into the effects of rate limiting and stick dynamics. Due to the non-numerical nature of the simulation results, a flexible three-phase flight test plan was developed, first varying the rate limits, then varying the stick dynamics, and finally flying a matrix determined in the first two phases. There were three major conclusions. First, the offset landing task flown was insufficient to …
Determining The Economic Plausibility Of Dual Manifesting Reusable Launch Vehicles And Reusable Orbital Transfer Vehicles For The Replenishment Of Military Satellites, Crystal L. Evans
Theses and Dissertations
Currently, the Air Force launches military satellites on expendable launch vehicles to low earth orbit (LEO), and with the use of a chemical upper stage or an apogee kick motor, moves the satellite to a higher orbit. This launch procedure is extremely costly because it requires additional launch preparations, technology considerations, equipment, and fuel. Also, the additional mass of the chemical upper stage causes a larger, and thus more expensive, launch vehicle to be required. An economical alternative is to utilize reusable launch vehicles (RLVs) and reusable orbital launch vehicles (ROTVs). This concept could possibly achieve even greater savings if …
Analysis Of Aircraft Sortie Generation With Concurrent Maintenance And General Service Times, Daniel V. Hackman
Analysis Of Aircraft Sortie Generation With Concurrent Maintenance And General Service Times, Daniel V. Hackman
Theses and Dissertations
The primary objective of this study was to develop an analytical methodology for evaluating an aircraft sortie generation process. The process is modeled as a closed network of general service queues with a fork join node to model concurrent servicing. The model uses the Mean Value Analysis (MVA) algorithm and general queueing network analysis by decomposition to approximate network performance measures including resource utilization and the overall sortie generation rate. The results of the study show that the analytical approximation's accuracy decreases as server utilization increases. However, when server utilization is kept in realistic ranges, the approximation is very accurate. …
Requirements, Design, And Development Of A Rapidly Reconfigurable, Photo-Realistic, Virtual Cockpit Prototype, Terry A. Adams
Requirements, Design, And Development Of A Rapidly Reconfigurable, Photo-Realistic, Virtual Cockpit Prototype, Terry A. Adams
Theses and Dissertations
The United States Air Force uses aircraft flight simulators for pilot training and mission rehearsal. They use a variety of simulators for this task ranging with prices ranging from $400,000 to $30,000,000. These simulators have specialized hardware that restricts reuse of their components and increases maintenance costs. Air Education and Training Command wants to reduce simulators cost and improve availability to the operational commands by supporting research in virtual reality flight simulators. This thesis looks at the development of a reconfigurable virtual cockpit in a distributed virtual environment that can be used for different aircraft as well as training scenarios. …
Assessing User Requirements For An Automated System To Support Programmed Depot Maintenance Through Use Of A Rapid Prototype In A Group Support System Environment, Floyd A. Gwartney
Assessing User Requirements For An Automated System To Support Programmed Depot Maintenance Through Use Of A Rapid Prototype In A Group Support System Environment, Floyd A. Gwartney
Theses and Dissertations
The purpose of this thesis was to assess user requirements for an automated information system to support programmed depot maintenance (PDM). To accomplish this, the Integrated Technical Information for the Air Logistics Centers (ITI-ALC) program's rapid prototype was evaluated. The evaluation focused on users' perception of how well the prototype met system and human computer interface requirements for PDM technicians and managers. A group support system (GSS) was used as an analysis tool to evaluate the prototype and collect evaluation data. Using the prototype as a requirements baseline for the ITI-ALC system, this thesis had three objectives: to perform an …
Identifying Situational Constraints To Focus Quality Improvement In An Air Force Aerial Port, Timothy J. Pettit
Identifying Situational Constraints To Focus Quality Improvement In An Air Force Aerial Port, Timothy J. Pettit
Theses and Dissertations
This research analyzes the effects of situational constraints on individual performance within an Air Force Aerial Port squadron. Situational constraint research originated with laboratory studies by Peters and O'Connor in 1980 and was investigated in an Air Force field environment in 1984; mixed results were obtained. Laboratory studies identified direct performance inhibitors (Peters et al., 1980); however, field studies found little correlations with job performance (Kane, 1981; O'Connor et al., 1984a). Data collected in June 1995 (Dougherty, 1995) and March 1996, in this study, were used to accomplish a longitudinal analysis. Correlations between constraints and performance were also low in …
Prioritization Schemes Of The Air Force Logistics Reparable Pipeline, Brigham K. Briggs
Prioritization Schemes Of The Air Force Logistics Reparable Pipeline, Brigham K. Briggs
Theses and Dissertations
This study describes the prioritization schemes utilized in the Air Force logistics reparable pipeline. The reparable pipeline is defined and illustrated with flowcharts. A literature review examines previous research conducted on the reparable pipeline, including analytic and conceptual pipeline models, and pipeline management studies. In addition, the topic of prioritization as defined in the production/operations management academic discipline is reviewed. Prioritization schemes of the reparable pipeline are reported in tabular format in addition to descriptions of the various prioritization schemes. Recommendations for pipeline improvement and further research form a basis from which pipeline operation may be improved. p9
Development And Analysis Of A Dual-Role Fighter Deployment Footprint Logistics Planning Equation, Stanley E. Griffis, Joseph D. Martin
Development And Analysis Of A Dual-Role Fighter Deployment Footprint Logistics Planning Equation, Stanley E. Griffis, Joseph D. Martin
Theses and Dissertations
This research investigated the deployment footprint of a developing dual-role fighter, the Joint Strike Fighter (JSF). This thesis documents the creation of a point estimate linear equation and a spreadsheet model for deployment footprint analysis and provides three example applications of the spreadsheet model for the JSF. The development of the model focused towards direct application in the JSF acquisition process, however, this research also serves as a proof of concept for modeling any future weapon system's deployment footprint. The developed spreadsheet model allows the model manipulator to select a baseline weapon system then alter the various components which make …
Integration Of The Distribution And Repair In Variable Environments (Drive) Model Into Micap Policy, Bradley E. Anderson
Integration Of The Distribution And Repair In Variable Environments (Drive) Model Into Micap Policy, Bradley E. Anderson
Theses and Dissertations
The United States Air Force has implemented the Distribution and Repair In Variable Environments (DRIVE) Model to a limited degree for a limited range of items, and policy makers seem unsure as to the proper level of DRIVE utilization. New asset release sequences and policies have been proposed without evidence to support those decisions. The purpose of this study is to explore different levels of DRIVE implementation relating to proposed asset release policies in order to provide some evidence on which policy could best support Air Force weapon systems. A second purpose of this study is to show how the …
Crisis Airlift Management: Effective Scheduling, David C. Penny
Crisis Airlift Management: Effective Scheduling, David C. Penny
Theses and Dissertations
This is a report on the basis, data, findings, and models developed for US Transportation Command and Headquarters Air Mobility Command. Focusing on the dynamic scheduling problem that arises during management of airlift assets into space-constrained airfields during a crisis, this research explains the conditions surrounding this event, discusses several areas of potential cross-functional applications, presents analysis of current performance, and provides several modeling possibilities for schedule efficiency. Past research in the Flow Management Problem (an airline flow control issue) is extensive, but specific applications in crisis airlift are long in coming, primarily due to the complexity of the environment. …
An Analysis Of Air Mobility Express Requirements Operating Within A Lean Logistics Wartime Environment, Jennifer A. Bollinger, Kellie L. Davila-Martinez
An Analysis Of Air Mobility Express Requirements Operating Within A Lean Logistics Wartime Environment, Jennifer A. Bollinger, Kellie L. Davila-Martinez
Theses and Dissertations
Lean Logistics was developed in response to budget cuts, force reductions, and a new political world order. The primary objective of Lean Logistics is to minimize the total system wide costs of the Air Force organization. Currently, the Air Force is seeking to cut costs by reducing inventories, improving repair processes, and employing faster transportation where possible. The purpose of this thesis is to determine if the Air Mobility Express (AMX) current sizing plan is capable of supporting the retrograde assets generated during the sustainment portion of a war. The Dyna-METRIC version 6.4 simulation program is employed to analyze the …
An Evaluation Of U.S. Air Force Aviation Fuel Consumption Factors To Accurately Predict Aviation Fuel Costs By Aircraft Mission, Design, And Series, Jodi A. Clayton
An Evaluation Of U.S. Air Force Aviation Fuel Consumption Factors To Accurately Predict Aviation Fuel Costs By Aircraft Mission, Design, And Series, Jodi A. Clayton
Theses and Dissertations
The purpose of this thesis was to undertake a systematic, scientific study of the accuracy of Air Force published fuel factors to estimate fuel costs at MAJCOM level by mission, design, and series (MDS) since the implementation of the Fuels Automated Management System (FAMS) under the current environment of decentralized aviation fuel (AVFUEL) funding. The research found that, at MAJCOM level, the use of USAF published AVFUEL factors in estimating out-year costs would have overstated costs in both fiscal year (FY) 1994 and FY 1995 by $2.5 M (FY 1994), by $.25 M (FY 1995), and may potentially understate costs …
Information Requirements Analysis: A Qualitative Characterization Of The Flightline Expediter For The Integrated Maintenance Information System, John C. Gorla Jr.
Information Requirements Analysis: A Qualitative Characterization Of The Flightline Expediter For The Integrated Maintenance Information System, John C. Gorla Jr.
Theses and Dissertations
The Integrated Maintenance Information System (IMIS) concept design includes the addition of management tools to access IMIS databases and provide communication capabilities between flightline technicians and supervisors. Armstrong Laboratory has developed a portable maintenance aid for technicians, and sponsored this research to investigate the requirements for a computer based tool for the expediter, The basic hardware and software requirements document for IMIS, the System/Segment Specification (SSS), contains task information that closely corresponds to the expediter job description as defined in Air Combat Command Instruction 21-166. This research compiled a list of information requirements for the expediter from the IMIS SSS …
The Value Of The Civil Reserve Air Fleet: How Much Could The Dod Spend On Incentives?, Pamela S. Donovan
The Value Of The Civil Reserve Air Fleet: How Much Could The Dod Spend On Incentives?, Pamela S. Donovan
Theses and Dissertations
This study evaluated the value of the Civil Reserve Air Fleet (CRAF) program to the DoD and explored the amount that could be spent to remove potential obstacles to participation with aviation insurance and lost market share. In comparing the value of the CRAF and the cost of current incentives, it was determined that up to $1.4 million could be spent on additional incentives, annually. For multiple aircraft losses and liability claims, the Air Force would need to tap into the Defense Business Operating Fund. Therefore, a sensitivity analysis was conducted and found that for low valued aircraft, such as …
Airlift System Sensitivity To Perturbed Time-Phased Force Deployment Data, Glenn G. Rousseau
Airlift System Sensitivity To Perturbed Time-Phased Force Deployment Data, Glenn G. Rousseau
Theses and Dissertations
This research evaluated the effects of perturbations in time phased force deployment data (TPFDD) on airlift system performance. Four characteristics of two TPFDD files were perturbed according to a 2(4-1) fractional factorial experimental design and then fed into the Airlift Flow Module (AFM) simulation. Specifically, small, constrained perturbations were made to the specified locations, the timeline, the amounts of cargo and passengers, and the proportion of outsize and oversize cargo categories. The effects these perturbations had on AFM output were interpreted using factor analysis. The computed factor scores, when plotted against one another, provided sensitivity plots, graphically depicting the sensitivity …
Modeling Diminishing Marginal Returns: An Application To The Aircraft Availability Model, Wayne L. Zorn
Modeling Diminishing Marginal Returns: An Application To The Aircraft Availability Model, Wayne L. Zorn
Theses and Dissertations
The Aircraft Availability Model (AAM) provides the Air Force with a worldwide peacetime requirement for reparable spare parts. This research models AAM methodology as it relates to the concept of diminishing marginal returns in resource application. Three separate modeling techniques are investigated with the goal of reformulating the AAM as a mathematical programming model that provides a comparable solution and a capable tool for the conduct of sensitivity analysis. The general formulations presented here are continuous non-linear, continuous linear, and piecewise linear discrete/continuous models. Two formulations of the piecewise linear discrete/continuous model are presented. The piecewise linear model based on …
Requirement For C-130 Aircraft In The Intratheater Korean Scenario, Philip B. Oglesby
Requirement For C-130 Aircraft In The Intratheater Korean Scenario, Philip B. Oglesby
Theses and Dissertations
In an effort to provide a timely and reasonably accurate methodology for determining C-130 intratheater airlift requirements, this research concentrated on a rough-cut capacity approach using a straight forward linear programming spreadsheet model. To provide more detailed analysis, a more sophisticated linear program was investigated. Specifically, the spreadsheet model calculated the minimum number of C-130s required to carry required cargo, passenger, and aeromedical loads based on user-defined daily requirements. For a given scenario, inputs include the daily requirements and the expected capacity for C-130 aircraft, trucks, and 22-car trains. Included in the capacity inputs are the number of daily cycles …
A Doctoral Degree In Aviation Science: The Need, Curriculum Content, And Other Considerations As Perceived By Aviation Educators Holding Doctoral Degrees, Barry Robert Beck
A Doctoral Degree In Aviation Science: The Need, Curriculum Content, And Other Considerations As Perceived By Aviation Educators Holding Doctoral Degrees, Barry Robert Beck
Theses and Dissertations
The primary purpose of this study was to determine if there is a need for a doctorate in aviation, what content areas should be included in the doctoral program, and what type of degree should an aviation doctoral program establish, as perceived by doctorally-prepared aviation educators. A two-round Delphi method was used to obtain a consensus from a group of doctorally-prepared experts on the content areas for doctoral programs in nonengineering aviation science. The panel of 100 experts were all doctorally-prepared and were members of the University Aviation Association, or if not members of the UAA, were working in collegiate …
A Case Study Of The Environmental Impacts Of The Beddown Of The C-17 Globemaster Iii At Charleston Afb, Richard H. Houghton Jr.
A Case Study Of The Environmental Impacts Of The Beddown Of The C-17 Globemaster Iii At Charleston Afb, Richard H. Houghton Jr.
Theses and Dissertations
Unites States Air Force acquisition environmental planning has changed significantly since the passage of the National Environmental Policy Act in 1969. This research examined the role of environmental planning in weapon system acquisition. It focused on environmental planning performed for the C-17 Globemaster III prior to its beddown at Charleston Air Force Base. The case study of the C- 17 beddown included interviews, archival record reviews, and direct observations at the base. Evidence was collected to determine what environmental impacts occurred during the beddown. An environmental postaudit compared actual impacts with those predicted in environmental planning documentation. Impacts were analyzed …
An Investigation Into Aircraft Availability, Michael S. Kapitzke
An Investigation Into Aircraft Availability, Michael S. Kapitzke
Theses and Dissertations
The Air Force currently uses an expected value model in the Aircraft Availability Model (AAM) to calculate aircraft availability. However, even with the application of Lean Logistics, the failure-demand rate and the depot repair time are not fixed and the mean value is still used in the model. This research looks at the effect of the magnitude of the variance of the distributions of failure-demand rate and depot repair time. Also, this research evaluates the effect of variable mean failure-demand rates on the variability of aircraft availability. A simulation model was developed which applied the variable failure-demand rates and depot …
A Performance Analysis Of The Air Force War Time Lean Logistics Pipeline, Craig S. Gaddis, David A. Haase
A Performance Analysis Of The Air Force War Time Lean Logistics Pipeline, Craig S. Gaddis, David A. Haase
Theses and Dissertations
Lean Logistics is an innovative proposal designed to reduce the costs associated with reparable inventory management. The purpose of this thesis is to determine whether a wartime lean logistics pipeline can maintain acceptable aircraft availability rates in response to induced variations of order and ship time (OST) and flying hours for deployed forces. The Dyna-MEIRIC Version 6.4 simulation program was used to evaluate nine different factor-level combinations. The factors, OST and flying hours were varied at three different levels, low, medium, and high. Analysis of the results was accomplished using a two-factor ANOVA. The authors discovered that while increasing OST …
A Review Of Fighter Aircraft Capability For Smart Bombs, David R. King
A Review Of Fighter Aircraft Capability For Smart Bombs, David R. King
Theses and Dissertations
This study examined potential alternatives and decision criteria for inclusion in a Cost and Operational Effectiveness Analysis to recommend an alternative for addressing existing DOD multi-role fighter capability to employ inertially guided smart bombs. A survey of literature and interviews with expens were used to collect required information. An Analytical Hierarchy Process (MIP) decision model was developed for two feasible alternatives and four relevant decision criteriL The two feasible alternatives included either developing the BRU-53 smart bomb rack, or modifying F-15E conformal fuel tanks with additional smart interface wiring. Data on quantitative and qualitative decision criteria were collected to evaluate …
Aligning Demand For Spare Parts With Their Underlying Failure Mode, Steven D. Kephart, Richard C. Roberts
Aligning Demand For Spare Parts With Their Underlying Failure Mode, Steven D. Kephart, Richard C. Roberts
Theses and Dissertations
Current Air Force demand forecasting systems, DO41 and REALM, assume reparable demand is solely flying hour driven. The purpose of this study is to evaluate the relationship between demands, flying hours, and number of sorties at the work unit code level and improve reparable demand forecasting. A three phase methodology is used to analyze the demand, flying hour, and sortie relationship. The first phase uses multiple regression to determine a relationship at various work unit code levels. Multiple regression provides limited correlation between demands, flying hours, and sorties. The second phase uses Poisson regression to evaluate the integer, count nature …
The Effect Of Consolidating Two-Level Reparable Inventories On Aggregate Inventory Requirements And Mission Capability, Glenn R. Barney
The Effect Of Consolidating Two-Level Reparable Inventories On Aggregate Inventory Requirements And Mission Capability, Glenn R. Barney
Theses and Dissertations
One of the proposals of Lean Logistics is the relocation of many inventory assets to Intermediate Supply Points (ISPs). This research investigates the effect of consolidating Two Level Maintenance designated reparable asset inventories. The effects of interest are the potential reduction in aggregate inventory requirement and resulting savings and the effect of delayed issue of the assets on mission capability. The metric selected to measure the effect on mission capability for this study is the Not Mission Capable-Supply (NMCS) rate. A spreadsheet analysis of world-wide Two-Level Maintenance designated reparable asset demands over the study period is used to determine the …
A Study Of The Structural Limitation Affecting Implementation Of The Government Performance And Results Act In Air Force Materiel Command Logistics, Darwina M. Liguori
A Study Of The Structural Limitation Affecting Implementation Of The Government Performance And Results Act In Air Force Materiel Command Logistics, Darwina M. Liguori
Theses and Dissertations
This thesis provides an in-depth discussion of the Government Performance and Results Act (GPRA) of 1993. The GPRA is a new law that mandates strategic management be conducted in all federal government agencies. Soon all federal government agencies will be directed to comply with the requirements of the law and implement strategic management within their organizations. This study selected Air Force Materiel Command Headquarters (AFMC) logistics organizations and subordinate units as the test organization. Interviews were conducted with headquarters AFMC logistics and strategic planning personnel, as well as 88th Logistics Group personnel to evaluate several issues within their organization: (1) …
Applications Of Statistical Process Control In Monitoring Aircrew Bombing Proficiency, Kirk G. Horton
Applications Of Statistical Process Control In Monitoring Aircrew Bombing Proficiency, Kirk G. Horton
Theses and Dissertations
The current tools used by squadron supervisors to monitor the bombing performance of aircrews flying F-111E aircraft are monthly reports that have little predictive capability. No real-time methodology exists for monitoring and predicting aircrew bombing performance and preventing bombing problems that might cause an individual to become unqualified. It has been suggested that Statistical process Control (SPC) can be applied to the bombing process to develop tools for managing the process, correcting problems, and improve the bombing performance of a squadron. This study investigates the application of SPC to the bombing process. It examines data taken from an F-111E Fighter …
Patient-Aircraft Forecasting For The Strategic Aeromedical Evacuation "Lift-Bed Process", Donald F. Kimminau
Patient-Aircraft Forecasting For The Strategic Aeromedical Evacuation "Lift-Bed Process", Donald F. Kimminau
Theses and Dissertations
The goal of this research is to develop a tool for the Global Patient Movement Requirements Center (GPMRC) to efficiently forecast Aeromedical Evacuation (AE) aircraft and schedule patients in the lift-bed process. During a contingency, GPMRC is responsible for requesting required airlift, and providing lift-bed candidates to the Theater Patient Movement Requirements Center. The objective is to evacuate all waiting patients while minimizing the number of C-141 aircraft which must be dedicated to the AE mission. In the solution process, a short-term forecast of patient movement requirements is input, including number of patients, bed and aircraft availability, and hub preferences. …
Analysis And Modeling Of An Airport Departure Process, Joseph E. Hebert
Analysis And Modeling Of An Airport Departure Process, Joseph E. Hebert
Theses and Dissertations
This study analyzes departure delays at a major airport using probability models to represent this non-homogeneous process. The models developed in this study expand on the Markovian models presently used by employing the method of stages to represent some of the model processes. This technique improves the user's ability to achieve a close fit for the service time probability distribution while maintaining the advantages of the Markovian model. The three types of models developed and compared all assume a Markovian system entry process. The first model uses an exponential distribution to model the service process. The second uses an Erlang …