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Full-Text Articles in Engineering
An Analysis Of Current Interruption Upon The Behavior Of Light Bulb Filament During Initial Aircraft Impact In Support Of Aircraft Accident Investigations, Daniel J. Larow
Master's Theses - Daytona Beach
The purpose of analyzing annunciator panels, warning, and indicator lamps is to determine the state ("on" or "off") of each light bulb immediately before the impact. Determination of the state of lamps may help investigators determine the probable cause of the accident. The information gained from the lamp's filaments may be used to infer the aircraft's operational parameters prior to impact and to a qualitative appreciation of the severity of the accident. It is generally agreed that upon impact the filament of an unlit bulb will fracture without deformation and the filament of a lit bulb will display plastic deformation …
Utilizing A Product Rejuvenation Framework To Investigate University Aviation Association Members' Perceptions Of The Cessna 172 As A Single Engine Trainer, George A. Wrigley Iii
Utilizing A Product Rejuvenation Framework To Investigate University Aviation Association Members' Perceptions Of The Cessna 172 As A Single Engine Trainer, George A. Wrigley Iii
Master's Theses - Daytona Beach
The purpose of this research was to utilize a product rejuvenation framework to investigate if sufficient market demand exists for Cessna in relaunching the 172 in the collegiate trainer market. The Collegiate Aviation Guide, a publication of the University Aviation Association listing UAA members and their respective aviation offerings, was used to establish the initial population for the research. The UAA members located within the 50 United States which 1) had a flight training program, and 2) owned and operated their own fleet of aircraft, represented the survey population. A total of 64 schools met the established criteria, with 55 …
Application Of Active Noise Control To Reduce Cabin Noise In Single Engine General Aviation Aircraft, Jeroen Hendrik Dolmans
Application Of Active Noise Control To Reduce Cabin Noise In Single Engine General Aviation Aircraft, Jeroen Hendrik Dolmans
Master's Theses - Daytona Beach
The application of active noise control to reduce cabin noise in single engine, general aviation aircraft is investigated through the use of the 'filtered x' least mean square algorithm and a simple acoustic feedforward method to generate a reference signal is tested. The system is designed to utilize one reference signal and up to two feedback signals and two audio speakers. The feedforward system consists of a microphone placed in close proximity to the front windshield and isolated from the cabin noise. Cabin noise and reference signals are recorded during flight in a Cessna 172 Skyhawk, a Piper Cherokee 140 …
Structural Design Of A Crashworthy Energy Absorbing Passenger Seat For A Large Transport Aircraft Using Large Displacement, Nonlinear Material Finite Element Analysis, Javier Fuentes
Master's Theses - Daytona Beach
Federal Aviation Regulations certification criteria for transport aircraft seats require performing dynamic tests using anthropomorphic test dummies. Floor decelerations of the tests are 16g forward with the seat tracks misaligned by up to 10 degrees and 14g downward at a pitch angle of 30 degrees. In this project the dynamic response of the passenger/seat/restraint system is modeled using nonlinear finite element analysis. The interference between a dummy model and the seat is modeled using a contact interaction algorithm. This algorithm did not converge and multiple-point constraints were used to transfer the dummy's inertia load. This approach was validated with the …
An Optimization Technique Of Airlines' Seat Inventory Management, Husam Abdallah Mahmoud Fanasheh
An Optimization Technique Of Airlines' Seat Inventory Management, Husam Abdallah Mahmoud Fanasheh
Master's Theses - Daytona Beach
This study consisted of a simulation to maximize an airline's Origin- Destination revenues. It has been hypothesized that Linear Programming is capable of maximizing airlines' networks revenues. Simulation was performed with Linear Interactive Discrete Optimizer (LINDO). This project was designed to consider different fares and its classes along with multi flight connections. The seats' allocation process came out with the maximum possible revenues, and enough flexibility in terms of changing such allocation to work around competition and trends. Results came supportive to the hypothesis. Sensitivity analysis provided our model with a tool to modify and change different variables, like fares, …
Cooperative Power-Limited Optimal Rendezvous Between Many Spacecraft, Virginie Guerre
Cooperative Power-Limited Optimal Rendezvous Between Many Spacecraft, Virginie Guerre
Master's Theses - Daytona Beach
The minimum fuel rendezvous problem between several power-limited low-thrust spacecraft neighboring either a circular or an elliptic orbit is investigated. Both cooperative and non cooperative maneuvers are studied. The maximum principle of Pontryagin is applied to the optimal control rendezvous problem of several spacecraft. The gravitational field models investigated are the Clohessy-Wiltshire field and the inverse-square gravity field. Numerical solutions using a shooting method and the finite difference method are used in order to determine the trajectories of the spacecraft. Unlike previous investigations, this work is not restricted to a rendezvous of two spacecraft around a circular orbit, but a …
Passenger Knowledge Of Airline Safety Icons: A Cultural Study, Bridget L. Mattingly
Passenger Knowledge Of Airline Safety Icons: A Cultural Study, Bridget L. Mattingly
Master's Theses - Daytona Beach
The purpose of this study was to examine the relationship between Japanese, Korean, and American cultures in their ability to comprehend icons used in airline passenger safety information. The 116 subjects were outbound international airline passengers traveling from San Francisco International Airport to either Japan or Korea. The instrument used contained thirteen icons similar to those on current passenger safety briefing cards. Subjects were asked to identify the icons as accurately as possible. Answers were graded on a three point ordinal scale, and frequency data were obtained. To test for significant differences between cultures, the data were analyzed through use …
Development And Initial Evaluation Of An Acoustic Apparatus Used For Testing Of Farfield Noise Emitted By A Propeller In A Short Duct, R. Duane Oleson
Development And Initial Evaluation Of An Acoustic Apparatus Used For Testing Of Farfield Noise Emitted By A Propeller In A Short Duct, R. Duane Oleson
Master's Theses - Daytona Beach
The purpose of this thesis was to design, construct and evaluate an apparatus which was used for testing of acoustic emissions by a propeller in a short duct. An apparatus was designed based on a combination of acoustic principles and a desire to be able apply the knowledge gained to a practical application such as an ultralight aircraft in an effort to reduce the overall noise levels emitted. The apparatus consisted of a 35 horsepower ultralight engine, a four bladed ultralight propeller, and a duct constructed of a foam core covered with fiberglass. Initial evaluations compared noise levels from the …
The Design And Experimental Optimization Of A Wingtip Vortex Turbine For General Aviation Use, Andrew Roberts
The Design And Experimental Optimization Of A Wingtip Vortex Turbine For General Aviation Use, Andrew Roberts
Master's Theses - Daytona Beach
A wingtip vortex turbine (WVT) is an induced drag reduction device that straightens the vortex flow (reducing induced drag and wake turbulence) and also produces a thrust force component. The WVT also has the advantage of extracting the rotational energy of the vortex to turn a generator, which could be used to power onboard applications during normal or emergency flight operations. A 1/4-scale model of a thrust-producing WVT has been designed and tested in a wind tunnel for optimal drag reduction and power generation for general aviation aircraft — specifically, a Piper Cherokee — in both a stationary and a …
An Investigation Of The Hydrodynamic Effects Of Enteromorpha Clathrata Fouling On Hydrofoils, Brian J. Collino
An Investigation Of The Hydrodynamic Effects Of Enteromorpha Clathrata Fouling On Hydrofoils, Brian J. Collino
Master's Theses - Daytona Beach
The purpose of this investigation was to determine the effects of biological fouling on hydrofoils. NACA 4412 and 4415 hydrofoil models with 6 inch chord and 8 inch span were used in this study. A water tunnel facility was designed and constructed to perform the tests, and the results were verified using computational fluid dynamic modeling. The CFD software package Fluent was used to create a two dimensional model of the water tunnel test section and hydrofoil. The model was meshed using a Laplacian grid smoothing technique that forced the structured grid lines to follow the same approximate contour as …