Open Access. Powered by Scholars. Published by Universities.®

Aerospace Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

6,065 Full-Text Articles 7,797 Authors 2,171,447 Downloads 126 Institutions

All Articles in Aerospace Engineering

Faceted Search

6,065 full-text articles. Page 3 of 198.

Space And Defense – Volume Seven – Number One – Winter 2014, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Seven – Number One – Winter 2014, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Six – Number One – Fall 2012, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Six – Number One – Fall 2012, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Five – Number One – Summer 2011, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Five – Number One – Summer 2011, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Four – Number Two – Summer 2010, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Four – Number Two – Summer 2010, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Four – Number One – Winter 2010, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Four – Number One – Winter 2010, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Three – Number Two – Fall 2009, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Three – Number Two – Fall 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Three – Number One – Summer 2009, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Three – Number One – Summer 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number Three – Winter 2009, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Two – Number Three – Winter 2009, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number Two – Winter 2008, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Two – Number Two – Winter 2008, Space And Defense Journal

Space and Defense

No abstract provided.


Space And Defense – Volume Two – Number One – Winter 2008, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume Two – Number One – Winter 2008, Space And Defense Journal

Space and Defense

No abstract provided.


Signal Quality Monitoring Of Gnss Signals Using A Chip Shape Deformation Metric, Nicholas C. Echeverry 2020 Air Force Institute of Technology

Signal Quality Monitoring Of Gnss Signals Using A Chip Shape Deformation Metric, Nicholas C. Echeverry

Theses and Dissertations

The Global Navigation Satellite System continues to become deeply em-bedded within modern civilization, and is depended on for confident, accurate navigation information. High precision position and timing accuracy is typically achieved using differential processing, however these systems provide limited compensation for distortions caused by multi-path or faulty satellite hardware. Signal Quality Monitoring (SQM) aims to provide confidence in a receivers Position, Navigation, and Timing solution and to offer timely warnings in the event that signal conditions degrade to unsafe levels. The methods presented in this document focus on implementing effective SQM using low-cost Commercial Off-the-Shelf equipment, a Software Defined Radio ...


Investigation Of Ultem 9085 For Use In Printed Orbital Structures, William R. Gallagher 2020 Air Force Institute of Technology

Investigation Of Ultem 9085 For Use In Printed Orbital Structures, William R. Gallagher

Theses and Dissertations

Additive manufacturing is revolutionizing industries ranging from medicine to space. However, the structural characteristics of plastic parts created by these methods are not as well understood as their more established counterparts. This research explored two relevant areas: how the structural characteristics of ULTEM 9085 plastic behaved after exposure to orbital conditions and the design of the cross-sectional area of a beam to be 3-D printed in microgravity based on the expected loads from the printer. To study orbital effects, ULTEM 9085 was printed into 1/4th scale ASTM D638- 14 dogbones using a Stratasys 450mc printer. These dogbones were placed ...


Timely Near-Optimal Path Generation For An Unmanned Aerial System In A Highly Constrained Environment, Kyle J. Matissek 2020 Air Force Institute of Technology

Timely Near-Optimal Path Generation For An Unmanned Aerial System In A Highly Constrained Environment, Kyle J. Matissek

Theses and Dissertations

A current challenge in path planning is the ability to efficiently calculate a near-optimum path solution through a highly-constrained environment in near-real time. In addition, computing performance on a small unmanned aerial vehicle is typically limited due to size and weight restrictions. The proposed method determines a solution quickly by first mapping a highly constrained three-dimensional environment to a two-dimensional weighted node surface in which the weighting accounts for both the terrain gradient and the vehicle's performance. The 2D surface is then discretized into triangles which are sized based upon the vehicle maneuverability and terrain gradient. The shortest feasible ...


Relational Database Design And Multi-Objective Database Queries For Position Navigation And Timing Data, Sean A. Mochocki 2020 Air Force Institute of Technology

Relational Database Design And Multi-Objective Database Queries For Position Navigation And Timing Data, Sean A. Mochocki

Theses and Dissertations

Performing flight tests is a natural part of researching cutting edge sensors and filters for sensor integration. Unfortunately, tests are expensive, and typically take many months of planning. A sensible goal would be to make previously collected data readily available to researchers for future development. The Air Force Institute of Technology (AFIT) has hundreds of data logs potentially available to aid in facilitating further research in the area of navigation. A database would provide a common location where older and newer data sets are available. Such a database must be able to store the sensor data, metadata about the sensors ...


Flight Characteristic Verification Of The Variable Camber Compliant Wing, Sharee B. Acosta 2020 Air Force Institute of Technology

Flight Characteristic Verification Of The Variable Camber Compliant Wing, Sharee B. Acosta

Theses and Dissertations

Morphing wing technology gives aircraft the ability to change wing shape to control the aircraft and flight performance characteristics. AFIT, AFRL and USU Aero Lab have collaborated to design and test a variable camber compliant wing (VCCW) on a small unmanned aerial vehicle (UAV). Flight tests demonstrated the wing performance and provided data to refine a VCCW flight simulator. Work was completed with the USU AeroLab-generated MachUp and the actual flight data to improve the simulator to provide results close to those of the actual flight test. The research provides a tool to reduce time and cost for future flight ...


Object Detection With Deep Learning To Accelerate Pose Estimation For Automated Aerial Refueling, Andrew T. Lee 2020 Air Force Institute of Technology

Object Detection With Deep Learning To Accelerate Pose Estimation For Automated Aerial Refueling, Andrew T. Lee

Theses and Dissertations

Remotely piloted aircraft (RPAs) cannot currently refuel during flight because the latency between the pilot and the aircraft is too great to safely perform aerial refueling maneuvers. However, an AAR system removes this limitation by allowing the tanker to directly control the RP A. The tanker quickly finding the relative position and orientation (pose) of the approaching aircraft is the first step to create an AAR system. Previous work at AFIT demonstrates that stereo camera systems provide robust pose estimation capability. This thesis first extends that work by examining the effects of the cameras' resolution on the quality of pose ...


Alternate Materials For High-Speed Projectile Casing, Andrew W. Beard 2020 Air Force Institute of Technology

Alternate Materials For High-Speed Projectile Casing, Andrew W. Beard

Theses and Dissertations

A high-speed projectile impact is a highly complex dynamic problem that can be simplified with the use of finite element analysis solvers. Abaqus/Explicit was used to evaluate the impact of various projectiles using a plane strain setup. Using a baseline stainless steel projectile, the proposed sandwich construction design was analyzed and compared to the baseline projectile. The overall goal was to see if a new composite casing could perform similarly to the simple baseline projectile. The sandwich construction used stainless steel, tungsten, and silicon-carbide reinforce aluminum as outer and inner shell materials. The core material was created using additive ...


Space And Defense – Volume One – Number One – Fall 2006, Space and Defense Journal 2020 University of Nebraska at Omaha

Space And Defense – Volume One – Number One – Fall 2006, Space And Defense Journal

Space and Defense

No abstract provided.


Proper Orthogonal Decomposition And Recurrence Map For The Identification Of Spatial–Temporal Patterns In A Low-Re Wake Downstream Of Two Cylinders, Meihua Zhang, Zhongquan Charlie Zheng, Huixuan Wu 2020 University of Kansas

Proper Orthogonal Decomposition And Recurrence Map For The Identification Of Spatial–Temporal Patterns In A Low-Re Wake Downstream Of Two Cylinders, Meihua Zhang, Zhongquan Charlie Zheng, Huixuan Wu

Mechanical and Aerospace Engineering Faculty Publications

Flow decomposition methods provide systematic ways to extract the flow modes, which can be regarded as the spatial distribution of a coherent structure. They have been successfully used in the study of wake, boundary layer, and mixing. However, real flow structures also possess complex temporal patterns that can hardly be captured using the spatial modes obtained in the decomposition. In order to analyze the temporal variation of coherent structures in a complex flow field, this paper studies the recurrence in phase space to identify the pattern and classify the evolution of the flow modes. The recurrence pattern depends on the ...


Development And Testing Of Novel Antimicrobial Materials For Additive Manufacturing With Application In Space, Michael Thompson, Jorge Zuniga, Christopher Copeland, Roberto Saavedra, Claudia Cortes Reyes, Andres Acuña Velásquez, Daniel Martínez Pereira, Claudio Soto 2020 University of Nebraska at Omaha

Development And Testing Of Novel Antimicrobial Materials For Additive Manufacturing With Application In Space, Michael Thompson, Jorge Zuniga, Christopher Copeland, Roberto Saavedra, Claudia Cortes Reyes, Andres Acuña Velásquez, Daniel Martínez Pereira, Claudio Soto

Student Research and Creative Activity Fair

PURPOSE: The purpose of the study was twofold: (i) develop and test the antimicrobial properties of a polylactic acid- and a polyurethane-based filament, and (ii) use these filaments to manufacture a socket-based prosthesis to verify printability and longevity of the antimicrobial properties. It was hypothesized that the formulation of a novel biocidal copper-based nanocomposite with a biocompatible 3D printing polymer/copolymer can be used for the development of antimicrobial medical devices to mitigate microbial risks during long space flight missions [1, 2, 3].

METHODS: Polylactic Acid-based Filament Development-The development of a polylactic acid-based filament involved several processes, such as ...


Digital Commons powered by bepress