Engineering Commons^™

Acoustic Emission For Periodic Inspection Of Composite Pressure Vessels, Bao Rasebolai Mosinyi

Master's Theses - Daytona Beach

Cost savings can be achieved in a wide range of applications by replacing the current procedure for hydrostatic recertification of high-pressure composite gas cylinders with acoustic emission (AE) nondestructive testing. Advantages of AE recertification over the current hydrostatic method include: (1) no water contamination, since pressurization of the cylinders is done with air as opposed to water; (2) the risk of damage is decreased since the test pressure is reduced from 166% of design pressure to 110% of operating pressure; (3) the ability of acoustic emission to detect and locate flaws increases safety; and (4) the in-situ method will reduce …

Low Proof Load Prediction Of Ultimate Strengths Of Fiberglass/Epoxy I-Beams Using Acoustic Emission, Edward C. Fatzinger Jr.

Master's Theses - Daytona Beach

Acoustic emission (AE) nondestructive testing was used to monitor fiberglass/epoxy I-beams. The experiment consisted of loading the I-beams in cantilever fashion with a hydraulic ram. While testing, AE waveforms were collected from the onset of loading to failure. After acquisition, the AE data from each test were filtered to include only data collected up to 50% of the theoretical ultimate load for further analysis.

A Kohonen self-organizing map was utilized to separate each individual data point (hit) into failure mechanism clusters. Then a multiple linear regression analysis was performed using the percentage of hits associated with each failure mechanism along …

Design And Construction Of A 1/3-Scale, 1986 Cessna 172p Flight-Test Aircraft, Michael J. Hinton

Master's Theses - Daytona Beach

The incredible cost of prototype flight testing can be a very limiting factor in the optimization of new designs as they proceed from the drawing board to the flight line. The use of low-cost scaled models to predict full-scale prototype performance is the focus of this project. It will be shown that by strictly following geometric and dynamic scaling criteria, the scaled aircraft's flight performance can be predictably related to the full-scale aircraft's performance. Many companies have performed scaled flight-testing of Remotely Piloted Vehicles (RPV's) and there is much speculation as to the results of these tests, but non-proprietary information …

The Effect Of Cockpit Noise On Aircraft Pilot Psychomotor Performance, Kelechi (Kc) Nwabeke

Master's Theses - Daytona Beach

The purpose of this study was to evaluate the effect of cockpit noise on aircraft pilot psychomotor performance on a simulated tracking task. The performance of thirty-two participants was measured on a vertical and horizontal tracking task. In the control group, eight participants were used in a quiet condition. In the experimental group, eight participants were exposed to low intensity cockpit noise (50 dBA), eight participants were exposed to medium intensity cockpit noise (60 dBA) and eight participants were expose to high intensity cockpit noise (70 dBA). The performance of the control and experimental groups was measured in an advanced …

Human Technology And Terrorism: Implications For Aviation Security, Ibpp Editor

International Bulletin of Political Psychology

This article describes common human vulnerabilities when using technology to minimize aviation security threat.

Simulation Of Engineering Systems Described By High-Index Dae And Discontinuous Ode Using Single Step Methods, Marc Compere

Publications

This dissertation presents numerical methods for solving two classes of or-dinary diferential equations (ODE) based on single-step integration meth-ods. The first class of equations addressed describes the mechanical dynamics of constrained multibody systems. These equations are ordinary differential equations (ODE) subject to algebraic constraints. Accordinly they are called differential-algebraic equations (DAE).

Specific contributions made in this area include an explicit transforma-tion between the Hessenberg index-3 form for constrained mechanical systems to a canonical state-space form used in the nonlinear control communities. A hybrid solution method was developed that incorporates both sliding-mode control (SMC) from the controls literature and post-stabilization from …

Human Factors Survey Of Aviation Technical Manuals, Phase 1: Manual Development Procedures, Alex Chaparro, Loren S. Groff

Publications

This report contains the results from Phase 1 of a three-phase research effort. Phase 1 examines aviation industry procedures for developing maintenance technical data. Phase 2 will document user problems with maintenance technical data. Phase 3 will identify maintenance technical data development improvements by applying human factors principles. Five aircraft manufacturers were surveyed regarding company policy, communication, data tracking, user feedback, and error reduction efforts. The five industry participants represent both regional and large commercial transport manufacturers. Phase 1 survey results revealed three significant maintenance technical data issues: inconsistent development process guidelines, reactive rather than proactive response to user feedback, …

The Effect Of Target Position And Tactual Recognition Field Size On Touch Bias And Accuracy, Elizabeth L. Brix

Master's Theses - Daytona Beach

Past studies have shown that touchscreen display angles other than those that perpendicularly bisect the operator's line of sight cause the operator to touch slightly below the target. The amount of touch bias created from this misjudgment fluctuates according to the target's position on the screen. Additionally, the percentage of touches that activate a specific target varies according to the size of the tactual recognition field. Out of three square tactual recognition field sizes, this study sought to match these fields with the amount of touch bias occurring in each location (i.e., small amount of touch bias requires only a …

Transitory Forecasting Methodology: Passenger/Revenue Share And Capacity Share (The S-Curve), Marlene Marie Dugan

Master's Theses - Daytona Beach

The purpose of this descriptive study was to explore the relationship between a carrier's service/capacity share and passenger share to determine the presence of the s-curve. The author is unaware of a current, accepted analysis for understanding the s-curve with any degree of reliability. Regression analysis was used to correlate service/capacity share against passenger share for domestic, United States air carriers. Carrier ranking was then added as a predicting variable to gain further insight into the correlation between service share and passenger share. It is anticipated that this study will be beneficial to airline network planners in their analysis of …

The Effects Of Sound Cue Characteristics On Overcoming Front/Back Localization Errors In A 3-D Auditory Display, Robert J. Ehmann

Master's Theses - Daytona Beach

The purpose of this study was to investigate the performance effects of adding an additional sound cue characteristic to a 3-D auditory display sound stimulus to increase localization accuracy. Previous literature has provided evidence that localization accuracy for direct front and direct back regions is significantly worse than that of locations in the periphery for virtual 3-D auditory stimuli. In the study conducted, a highpass filter addition or a lowpass filter addition was compared to a "normal" condition for both the front and back locations. Results of the study showed that the best localization performance for the front location occurred …

Effects Of Handedness On Completion Time During Performance Of Multiple Tasks Using “Proper” And “Improper” Tools, Lisnnette M. Nieves Suarez

Master's Theses - Daytona Beach

Handedness is a very critical factor involving single or multiple tasks that are designed for a specific hand. The purpose of this research was to investigate the effect of proper tool design. This research identified the dominant hand and measured task completion time between each of two tasks, 1) the use of left and right-handed scissors using the right hand, and 2) Mouse Manipulation Task using the calculator provided by the computer with a left and right-handed mouse using the right hand. Annett’s (1995) 12-item questionnaire was used to identify the preferred hand. This questionnaire consisted of having the participants …

Effect Of Tactile Feedback On Performance, Darren Paul Wilson

Master's Theses - Daytona Beach

Humans interact with their environment by obtaining information from various modalities of sensing. These various modalities of sensing combine to facilitate manipulation and interaction with objects and the environment. The way humans interact with computers mirrors this environmental interaction with the absence of feedback from the tactile channel. The majority of computer operation is completed visually because currently, the primary feedback humans receive from computers is through the eyes. This strong dependence on the visual modality can cause visual fatigue and fixation on displays, resulting in errors and a decrease in performance. Distributing tasks and information across sensory modalities could …

Trends. The Ghost In The Machine: Is Bill Clinton Running Us Policy On China, Ibpp Editor

International Bulletin of Political Psychology

This article discusses aviation safety and the continuity of use/misuse of words by U.S. administrations, regardless of political affiliation.

Optimization Of Flow Quality In The Test Section Of The 30-Inch X 40- Inch Subsonic Tunnel, Ahmed F. Elnenaey

Master's Theses - Daytona Beach

The purpose of this study is to optimize the flow quality inside the 30-inch x 40-inch subsonic wind tunnel. The tunnel is an open circuit with its inlet positioned adjacent to the side door of the lab; forcing the air to make a ninety degrees turn entering the tunnel. The flow suffered from two main deficiencies, high level of turbulence and slightly unsteady flow with a non-uniform velocity distribution across the test section. By utilizing a hot-film anemometer system and a total pressure rake, turbulence and velocity distribution data were obtained. Rounded corners and a turning vane were installed in …

Solving Nonlinear Aeronautical Problems Using The Carleman Linearization Method, Brian William Gaude

Master's Theses - Daytona Beach

Many problems in aeronautics can be described in terms of nonlinear systems of equations. Carleman developed a technique to linearize such equations that could lead to analytical solutions of nonlinear problems. Nonlinear problems are difficult to solve in closed form and therefore the construction of such solutions is usually nontrivial. This thesis will apply the Carleman linearization technique to three model problems: a two-degree of-freedom (2DOF) ballistic trajectory, Blasius' boundary layer, and Van der Pol's equation and evaluate how well the technique can adequately approximate the solutions of these ordinary differential equations.

Air Cargo As A Different Business Unit, Juan M. Gomez

Master's Theses - Daytona Beach

By combining cargo and passenger operations under the same business, airlines are facing an operational conflict with respect to the cargo operation, which has always been perceived as a by-product and not as an essential revenue generating activity; This fact leads to poor product quality, weak revenues, and value deterioration. By dedicating time and resources to the cargo operation in a different business unit with a defined strategy, carriers may increase cargo profitability and achieve superior operational results.

The purpose of this study is to identify and explain the benefits for passenger airlines to invest in air-cargo operations by defining …

The Role Of Eeg Biofeedback Training Preceding An Automated Monitoring Task, Matthew Bernd Hilscher

Master's Theses - Daytona Beach

Discussions are taking place in aviation circles to revamp and revolutionize air traffic management under the term "free-flight". The plans for a new system would incorporate, to a high degree, automation technologies that may have important human factors implications. One such concern speaks to quality of mental involvement as authority roles change. This modification of cerebral involvement may have an effect on performance during critical system failures. The purpose of this research has been to investigate whether specialized EEG biofeedback training might have an ameliorating effect on reducing the vigilance decrement. Partial support was found that evidences utility to this …

Bridge Programs: A Strategic Partnership, Tim Brady

Publications

The results of a study commissioned by the National Business Aviation Association discussing factors related to alleviating airline pilot shortages. By utilizing universities with existing pilot training programs, universities are able to train new pilots in company-specific procedures. This bridge program allows the company to interface with the university and influence curriculum design.

The Other Information Warfare: A Mind Full Of Macedonia, Ibpp Editor

International Bulletin of Political Psychology

This article highlights ongoing aspects of psychological warfare in Macedonia between government and rebel forces.

Cyberpsychology And Virtual Reality: Is An Update Necessary, Ibpp Editor

International Bulletin of Political Psychology

This article explores the notion that something called "human nature" may be changing in an era of significant information technology developments.

A Human Error Analysis Of Commercial Aviation Accidents Using The Human Factors Analysis And Classification System (Hfacs), Douglas A. Wiegmann, Scott A. Shappell

Publications

The Human Factors Analysis and Classification System (HFACS) is a general human error framework originally developed and tested within the U.S. military as a tool for investigating and analyzing the human causes of aviation accidents. Based upon Reason’s (1990) model of latent and active failures, HFACS addresses human error at all levels of the system, including the condition of aircrew and organizational factors. The purpose of the present study was to assess the utility of the HFACS framework as an error analysis and classification tool outside the military. Specifically, HFACS was applied to commercial aviation accident records maintained by the …

Book Review: Space Shuttle: The History Of The National Space Transportation System: The First 100 Missions, T. D. Oswalt

Publications

This document is Dr. Oswalt’s review of Space Shuttle : the History of the National Space Transportation System: the First 100 Missions by Dennis R. Jenkins. Voyageur Press, 2001 513p, 0-9633974-5-1 $39.95.