Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 18 of 18
Full-Text Articles in Engineering
Free Response And Trim Force Requirements For Aircraft Configuration Changes, Marvin Toepfer
Free Response And Trim Force Requirements For Aircraft Configuration Changes, Marvin Toepfer
Theses and Dissertations
As an FAA Commercial Pilot and Flight Instructor, one comes in contact with many different types of experiences and abnormal situations. A widely known cause of fatal accidents in the general aviation industry, and also currently listed on the National Transportation Safety Board Most Wanted List, is the loss of control in the traffic pattern [1]. For many years now, different departments of the FAA and Department of Transportation, such as the FAA Small Airplane Directorate, have been trying to mitigate the risks and causes associated with the loss of control in the traffic pattern. Due to technological advancements and …
Aerodynamic Model Of The Piper Warrior Ii Based On Flight Test Data, Nicholas Casciola
Aerodynamic Model Of The Piper Warrior Ii Based On Flight Test Data, Nicholas Casciola
Theses and Dissertations
Aerodynamic modeling is an important part of aircraft design and of aircraft testing. Generally, this is done through CFD models and Wind Tunnel tests prior to the aircrafts first flight but building the models using flight test data is also very important. It is used to verify theoretical models generated from the computer and wind tunnel tests. They are also useful for building simulators, particularly those in modeling and analyzing airport traffic patterns. These tests used a Piper Pa-28-161 Warrior II owned by the Florida Tech Flight Test Engineering program. It has a 160hp Lycoming engine. The test pilot was …
Effect Of Film Cooling Hole Size On A Turbine Rotor Blade, Klint Martis
Effect Of Film Cooling Hole Size On A Turbine Rotor Blade, Klint Martis
Theses and Dissertations
The objective of this study was to evaluate the effect of the cooling hole size on the adiabatic film cooling effectiveness over a rotating turbine blade section. The study was conducted using ANSYS FLUENT to determine the adiabatic wall temperature over the blade surface. The geometry was created to be a single section of a turbine rotating at 4000 rpm, and the blade increases in camber from tip to hub. Cylindrical cooling holes were created and the diameters were varied from 0.5 mm to 1.5 mm. The pitch-to-diameter ratio and the length-to-diameter ratio were kept constant at a value of …
Cubesat Docking And Resource Sharing Mechanism, Shingo Kunito
Cubesat Docking And Resource Sharing Mechanism, Shingo Kunito
Theses and Dissertations
This thesis addresses the design concept of a CubeSat docking and resource sharing mechanism that allows to transfer propellant that is pressurized gas, data, and power. In docking and capture design, the interface is equipped with two air cylinders that are rated up to 20.68 MPa internal pressure generating the ideal force of 1218.4 N each. With the designed air cylinder and mounted configuration, the maximum capture distance between the target and the chaser CubeSat is 40.30 mm. Since air cylinder and body frame are designed specifically for this interface, structural analysis was conducted in ANSYS where results show a …
Quantitative Measurement Techniques For Vibration And Buffet, Edward Thomas Meyer
Quantitative Measurement Techniques For Vibration And Buffet, Edward Thomas Meyer
Theses and Dissertations
This paper outlines a proposed parameter for measurement of vibration and buffet in vehicles. It is intended to be used where applicable in lieu of raw accelerometer data or qualitative comments to measure ride quality, quantify vibration levels, and aid in certification matters. In flight vehicle applications which employ fly-by wire flight control systems with closed loop and variable gain control laws, the phenomenon of buffet in its various forms is becoming somewhat specious as an aircrew cue in relation to the stability and control of flight vehicles. In these applications, stability and control throughout the operating envelope is designed …
Development Of Adaptable Human-Machine Interface For Teleoperation Over Time Delay, May Nyein Chan
Development Of Adaptable Human-Machine Interface For Teleoperation Over Time Delay, May Nyein Chan
Theses and Dissertations
The Adaptable Human-Machine Interface (AHMI) was developed for the Orbital Robotic Interaction, On-orbit servicing, and Navigation (ORION) Laboratory of the Florida Institute of Technology. The primary project objective was to develop and test a predictive display for mitigating the effects of time delay in teleoperation of space robots and Unmanned Aerial Vehicles (UAV) using quadcopters as a test case. Regardless of the increasing popularity of various autonomous systems, research and development of teleoperating system should not be neglected since it is often utilized as a back-up in most autonomous systems especially in systems for human spaceflight and UAV operations in …
Control Development For Autonomous Landing Of Quadcopter On Moving Platform, Rakhayai Mangsatabam
Control Development For Autonomous Landing Of Quadcopter On Moving Platform, Rakhayai Mangsatabam
Theses and Dissertations
This thesis focuses on the control development for autonomous landing of a quadcopter on a moving platform. The object tracking and path following is performed through on-board vision-based systems. The goal of the thesis is to develop a controller for autonomous landing of a quadcopter and test its fidelity with simulations and experiments. The thesis is carried out in two sections, simulation and experiment. The simulation was carried out based on the system modeled and a PD (Proportional Derivative) controller was used to simulate the quadcopter landing. The simulation was split into three parts, with each part attempting to become …
Comparing Specific Excess Power Of General Aviation Aircraft, Yohan Forbes Auguste
Comparing Specific Excess Power Of General Aviation Aircraft, Yohan Forbes Auguste
Theses and Dissertations
The high number of Loss of Control and Controlled Flight into Terrain Accidents in General Aviation (GA) suggests that there is a lack of understanding and recognition of low energy states by pilots of GA aircraft. As a result there is a desire to implement an energy management system in GA aircraft to alert the pilot of low energy conditions and to give the required corrective action to get to a desired energy state. This requires an understanding of the performance capabilities of GA aircraft in terms of their ability to change their energy state. The ability to change the …
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Theses and Dissertations
Deposits of insoluble protein fibrils in human tissue are associated with amyloidosis and neurodegenerative diseases. Different proteins are involved in each disease; all are soluble in their native conformation in vivo, but by molecular self-assembly, they all form insoluble protein fibril deposits with a similar cross -sheet structure. The study of molecular self-assembly is also of interest to origin of life. The development of cellular activity was dependent upon the creation of large complex molecular structures in the chemical and environmental conditions present when life originated. Although life probably arose in a planetary environment, microgravity is known to effect cellular …
Control Laws For Autonomous Landing On Pitching Decks, Kendrick Buchala
Control Laws For Autonomous Landing On Pitching Decks, Kendrick Buchala
Theses and Dissertations
This thesis addresses the problem of landing a quadcopter onto the pitching deck of a ship, as a partial simulation of a shipboard landing during high seas. The deck is modeled to pitch with a sinusoidal motion. While shipboard landing consists of many stages, only the final landing is simulated in this research. Other ship motions, such as roll and heave, are likewise not considered. The goal is to land the quadcopter in the center of the deck with minimal position and pitch error, where position error measures how far fore or aft of the center of the landing pad …
Dynamics Of Spacecraft Orbital Refueling, Casey Clark
Dynamics Of Spacecraft Orbital Refueling, Casey Clark
Theses and Dissertations
A quantitative collation of relevant parameters for successfully completed experimental on-orbit fluid transfers and anticipated orbital refueling future missions is performed. The dynamics of connected satellites sustaining fuel transfer are derived by treating the connected spacecraft as a rigid body and including an internal mass flow rate. An orbital refueling results in a time-varying local center of mass related to the connected spacecraft. This is accounted for by incorporating a constant mass flow rate in the inertia tensor. Simulations of the equations of motion are performed using the values of the parameters of authentic missions in an endeavor to provide …
Direct Numerical Simulations Of Incompressible Flow Through Porous Packs Over A Wide Range Of Reynolds Numbers, Antoine Michael Diego Jost
Direct Numerical Simulations Of Incompressible Flow Through Porous Packs Over A Wide Range Of Reynolds Numbers, Antoine Michael Diego Jost
Theses and Dissertations
Direct numerical simulations of incompressible flow through periodic square/rectangular (two-dimensional; 2-D) and cubic (three-dimensional; 3-D) arrays of particles and periodic random packs of polydisperse spheres over a wide range of Reynolds numbers and at various porosities are performed. The unsteady Navier- Stokes equations are solved with either a 3-D parallel finite-difference (FD) inhouse research code on a collocated Cartesian grid and with an immersed boundary method (IBM) to treat the internal boundaries, or with the finite-volume (FV) solver OpenFOAM R⃝ on an unstructured grid and with an explicit treatment of the boundaries. The FD explicit solver is used for 2-D …
Modeling And Control Of A 6-Dof Multi-Rotorcraft: Air-Ball, Jerry Ja Wang
Modeling And Control Of A 6-Dof Multi-Rotorcraft: Air-Ball, Jerry Ja Wang
Theses and Dissertations
The Air-Ball project seeks to develop an omnidirectional, unmanned aerial vehicle with six degrees of freedom. The Air-Ball vehicle uses six propellers powered by six independent electric motors for propulsion and control. Each motor is attached to a hollow shaft that can rotate ±360° actuated by electric servos. Four of these propulsion shafts are configured in an orientation resembling a quad-copter, where the shafts are 90° apart. The other two propulsion shafts extrude perpendicular from each side of the plane of the quadcopter configuration. Under this unique configuration, Air-Ball is capable of decoupling the motion in the translational and rotational …
Development Of A Static Aeroelastic Database Using Nastran Sol 144 For Aircraft Flight Loads Analysis From Conceptual Design Through Flight Test, Ryan M. Haughey
Development Of A Static Aeroelastic Database Using Nastran Sol 144 For Aircraft Flight Loads Analysis From Conceptual Design Through Flight Test, Ryan M. Haughey
Theses and Dissertations
This paper describes a method for predicting aircraft aerodynamic and inertial loading on a structural finite element model, (FEM) based on static aeroelastic coefficients. These coefficients are computed via interpolated spline methods within NASTRAN Solution 144 (static aeroelastic solution) and the “TRIM” module to connect the doublet-lattice model (DLM) and the structural finite element model for a coupled solution. The database is created by selecting key breakpoints where linear interpolation techniques can be utilized to develop and predict static aeroelastic coefficients for the prediction of any aircraft state for a given transient solution. This method is applicable from conceptual design …
Numerical Analysis Of A Compact Helical Counterflow Heat Exchanger, Manikandan Chidambaram
Numerical Analysis Of A Compact Helical Counterflow Heat Exchanger, Manikandan Chidambaram
Theses and Dissertations
The performance of compact counter flow heat exchangers with helically shaped passages is examined using a 1-D analytical model and compared with a high-fidelity 3-D numerical simulation. The 1-D model is capable of assessing the general trends associated with the heat transfer performance and fluid pressure losses, whereas the high fidelity 3-D numerical model is needed to provide more accuracy. For water flow rates of 0.01 kg/s -1 kg/s, the models are used to predict the overall heat transfer coefficient ratio for a straight and counter helix heat exchanger. The maximum difference between the 3-D numerical and 1-D analytical model …
Evaluation Of Augmented Reality Glasses For Use In Flight Test Courses, Leonardo Macena Silveira
Evaluation Of Augmented Reality Glasses For Use In Flight Test Courses, Leonardo Macena Silveira
Theses and Dissertations
The objective of this thesis research was to analyze the implementation of new technologies into the flight test engineering major courses at Florida Institute of Technology. The focus was to use current augmented reality technology available in the market and create ways the students would be able to use it while performing experiments. Augmented reality is not the same as virtual reality. It is a technology that generates computer images of effect into an existing reality. In easier words, augmented reality projects images into the real-life surroundings the user locates. It allows the user to interact with the computer while …
Numerical And Analytical Modelling For Droplet Evaporation Resulting In Convective Flow Cooling Verified By Experimentation, Adwaith Ravichandran
Numerical And Analytical Modelling For Droplet Evaporation Resulting In Convective Flow Cooling Verified By Experimentation, Adwaith Ravichandran
Theses and Dissertations
The temperature of a gaseous convective stream can be reduced by injecting a colder liquid into the stream. The extent to which this gas temperature can be reduced depends on the amount of liquid being injected into the gas flow domain, rate of energy transfer (heat) from the gas phase to the liquid resulting in evaporation and the length of the domain itself referred to in this study as a “mixer”. This study proposes the use of a non-dimensional Damkohler number that relates the liquid residence time and the liquid life time which could serve as a yardstick to determine …
Evaluating Augmented Reality For Space Telerobotics Training, John Karasinski
Evaluating Augmented Reality For Space Telerobotics Training, John Karasinski
Link Foundation Modeling, Simulation and Training Fellowship Reports
Despite the extensive previous research into manual tracking, to the author’s knowledge there exists no study in the literature addressing human performance or workload changes in manual tracking tasks between traditional computer monitors and mobile, augmented reality headsets. The aim of this study was to investigate the effect of several factors on human performance and workload in a three-axis manual tracking task. Recent advances in computing hardware have enabled a new generation of augmented reality stereoscopic devices, such as the Microsoft HoloLens, which have yet to be evaluated in the literature. The Microsoft HoloLens provides depth cues to the user …