Engineering Commons^™

High Precision Solder Droplet Printing Technology: Principle And Applications, Qingbin Liu, M. Orme, Ming-Chuan Leu

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Solder droplet printing technology, which is low-cost, noncontact, flexible, data-driven, and environmentally friendly, has emerged as an enabling technology for precisely placing fine solder deposits on a variety of small substrates. It is suitable for a variety of applications including direct chip attach site preparation, 3D substrates, fine line interconnect, substrate via fill, optoelectronics and many others. It enables manufacturing techniques that are impossible or unfeasible with current technology, such as localized replacement of solder on board, depositing solder in different thicknesses on the same board, or using more than one type of solder on the same board. This makes …

Gulfstream Aerospace Aircraft Static Position Utility, Mark Eugene Ray

College of Graduate Studies: Theses & Dissertations (1964–2006)

My research project implements a Java based utility developed for commercial application by Gulfstream Aerospace employees and customers to determine static position data of Gulfstream aircraft. The static position data includes aircraft attitude, nose and main landing gear loads and aircraft ground clearance data.

The previous methods used to obtain this data were a family of spreadsheets. The spreadsheet solution has proven to be awkward and inaccessible for providing the required data. Therefore, Gulfstream Aerospace Management approved the design and implementation of a new aircraft static position utility.

The new utility is identified as the Gulfstream Aircraft Static Position (GASP) …

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.

A New Opportunity For Low-Cost Space Experimentation: Leland High School, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "A new Opportunity for Low-Cost Space Experimentation: Leland High School" from December 8, 2000.

Combined Loading Of Composite Box-Beams With Linearized Differential Equations Of Motion, Michael Alan Dupuis

Master's Theses - Daytona Beach

The purpose of the following analysis is to develop a method for determining vertical, horizontal, and torsional displacements of arbitrarily laminated, cantilevered composite box-beam under static, transverse loading. Small deflections are assumed and the differential equations of motion have been linearized for ease of calculation. The Smith and Chopra stiffness matrix is used in the equations of motion, and software was written to solve for the stiffness matrix elements. Comparisons are made with bending slope solutions from previously published results, and the presented analysis is compared to empirical results of a composite box-beam under tip loading. Finally, an example solution …

Examples Of Low-Cost Space Experimentation: University Space Systems Symposium, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Examples of Low-Cost Space Experimentation: University Space Systems Symposium" from November 11, 2000.

Subsystems & Components Review, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Subsystems & Components Review" from November 10, 2000.

Nanosat One Critical Design Review, Jonathan How, Christopher Kitts, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Jonathan How, Bob Twiggs, and Robert Twiggs titled "Nanosat One Critical Design Review" from November 8, 2000.

A New Opportunity For Low-Cost Space Experimentation: E201 Seminar, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "A new Opportunity for Low-Cost Space Experimentation: E201 Seminar" from November 6, 2000.

Nanosat One Critical Design Review: The Complete Review, Robert J. Twiggs, Christopher Kitts, Jonathan How

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Jonathan How, Bob Twiggs, and Christopher Kitts titled "Nanosat One Critical Design Review: The Complete Review" from November of 2000.

A New Challenge For Low-Cost Space Experimentation, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "A new Challenge for Low-Cost Space Experimentation" from October 23, 2000.

Formulation, Realization, And Demonstration Of A Process To Generate Aerodynamic Metamodels For Hypersonic Cruise Vehicle Design, Robert Mcdonald, D.N. Mavris

Aerospace Engineering

The desire to facilitate the conceptual and preliminary design of hypersonic cruise vehicles has created the need for simple, fast, versatile, and trusted aerodynamic analysis tools. Metamodels representing physics-based engineering codes provide instantaneous access to calibrated tools. Nonlinear transformations extend the capability of metamodels to accurately represent a large design space. Independence, superposition, and scaling properties of the hypersonic engineering method afford an expansive design space without traditional compounding penalties. This one-time investment results in aerodynamic and volumetric metamodels of superior quality and versatility which may be used in many forms throughout early design. As a module, they can be …

An Ameliorated Prediction Of The Empennage In-Flight Gust Loads For A General Aviation Aircraft, Philippe Marchand

Master's Theses - Daytona Beach

Airplanes often operate beyond their original design load profiles. Aviation opens so many new possibilities and wide variety of possible activities that it is hard for designers to foresee all loading spectra that the airplane structure will experience throughout its life. Nevertheless, the aircraft structures are required to be designed to failsafe or safe-life criteria to be certified by the FAA. AFS-120 provides a database of normal accelerations that can be used to derive airplane wing loads. ACE-100 describes an acceptable method for determining the fatigue life of an empennage based on the same normal acceleration data provided in AFS-120. …

Design And Rule Base Reduction Of A Fuzzy Filter For The Estimation Of Motor Currents, Daniel J. Simon

Electrical and Computer Engineering Faculty Publications

Fuzzy systems have been used extensively and successfully in control systems over the past few decades, but have been applied much less often to filtering problems. This is somewhat surprising in view of the dual relationship between control and estimation. This paper discusses and demonstrates the application of fuzzy filtering to motor winding current estimation in permanent magnet synchronous motors. Motor winding current estimation is an important problem because in order to implement effective closed-loop control, a good estimation of the current is needed. Motor winding currents are notoriously noisy because of electrical noise in the motor drive. We use …

A New Challenge For Low-Cost Space Experimentation: Naval Research Laboratory, Robert J. Twiggs, Jay Smith, Ivan Galysh

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs, Jay Smith, and Ivan Galysh titled "A new Challenge for Low-Cost Space Experimentation: Naval Research Laboratory" from September 21, 2000.

A New Challenge For Education With Low-Cost Space Experimentation, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "A new Challenge for Education with Low-Cost Space Experimentation" from September 8, 2000.

Cubesat: A New Generation Of Picosatellite For Education And Industry Low-Cost Space Experimentation, Robert J. Twiggs, Jordi Puig-Suari, Augustus S. Moore, Shinichi Nakasuka

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professors Bob Twiggs, Jordi Puig-Suari, Augustus S. Moore, and Shinichi Nakasuka titled "CubeSat: A new Generation of Picosatellite for Education and Industry Low-Cost Space Experimentation" given at the 14th Annual AIAA/USU Small Satellite Conference on Augaust 21, 2000.

Simulation And Analysis Of Wing Rock Physics For A Generic Fighter Model With Three Degrees-Of-Freedom, Ahmed Saad

Theses and Dissertations

Modern fighter designs have been associated with lateral self-excited oscillations own as "Wing Rock". Simulations of wing rock by flow visualization utilities have been encouraged to develop a complete understanding of the fluid mechanism that drives the motion as well as for prediction purposes. Previous wind/water tunnel simulations have been limited to a single degree-of freedom (DoF) in roll. In this study, for the first time, wing rock is computationally simulated in three DoF: roll, sideslip, and vertical motion to study the effect of adding file sideslip and vertical motion. The results are for a generic fighter model consisting of …

Space Systems Development Laboratory: Sharp Project, Robert J. Twiggs, Christopher Kitts, Pascal Stang, Pradeep Sen

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs, Chris Kitts, Pascal Stang, and Pradeep Sen titled "Space Systems Development Laboratory: SHARP Project" from August 3, 2000.

Nonlinear Analysis Of Unsymmetric Laminates Under Cylindrical Bending, Eun Seon Park

Master's Theses - Daytona Beach

Nonlinear analysis of unsymmetric composite long, narrow laminates under cylindrical bending is studied. The nonlinear governing equations are obtained to analyze the cylindrical bending of arbitrary laminates. The von-Karman type geometrical nonlinearity is incorporated in the governing equation. The shear effect between lamina is further considered in the governing equation. The solution is obtained for different boundary conditions. The results of arbitrary angle-plies are discussed. Unidirectional prepreg graphite-epoxy is considered for numerical results.

Spie Conference, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "SPIE Conference" from July 30, 2000.

Sharp-S1 Overview/Status, Paul Kolodziej

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Paul Kolodziej titled "SHARP-S1 Overview/Status" from July 20, 2000.

Three-Dimensional Dynamic Stress Analysis Of Sandwich Panels, Victor Y. Perel

Theses and Dissertations

A layerwise geometrically nonlinear theory for a thick sandwich plate was developed by introducing assumptions on a variation of transverse strains in the thickness direction of the faces and the core of the plate. An effect of transverse extensibility or compressibility of the core and the face sheets is taken into account, and the terms associated with transverse shear strain of the face sheets and the core are included into the expression for the strain energy. Displacements, obtained by integration of the strain-displacement relations, depend nonlinearly on a coordinate in the thickness direction, and are continuous at the boundaries between …

Lidar Observations Of Elevated Temperatures In Bright Chemiluminescent Meteor Trails During The 1998 Leonid Shower, Xinzhao Chu, Alan Z. Liu, George Papen, Chester S. Gardner

Physical Sciences - Daytona Beach

Seven persistent trails associated with bright fireballs were probed with a steerable Na wind/temperature lidar at Starfire Optical Range, NM during the 17/18 Nov peak of the 1998 Leonid meteor shower. These chemiluminescence trails were especially rich in Na. The average Na abundance within the trails was 52% of the background Na layer abundance, which suggests that the corresponding masses of the meteors were from 1 g up to 1 kg. CCD images show that the chemiluminescent emissions (including Na and OH) are confined to the walls of a tube, which expands with time by molecular diffusion. Lidar profiles within …

The Fundamental Use And Extension Of Mode Stirred Chambers, Stephen A. Scearce

Electrical & Computer Engineering Theses & Dissertations

Mode stirred chambers are used to perform radiated susceptibility tests on equipment that is expected to operate normally when exposed to electromagnetic (EM) fields. These tests are useful in identifying failure events in airborne equipment and other electronic equipment that are exposed to EM fields. This thesis is focused on further defining the operating environment of mode stirred chambers and relating the electromagnetic environment in the chamber to the electromagnetic environment of an actual aircraft. The majority of mode stirred chamber tests are implemented by using mechanical mode stirring. Mechanical mode stirring is the process of varying boundary conditions in …

The Emerald Nanosatellites:Two Student-Built Satellites As A Testbed For Distributed Space System Technologies, Julie Anne Townsend

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Julie Anne Townsend titled "The Emerald Nanosatellites:Two Student-Built Satellites as a testbed for Distributed Space System Technologies" from June of 2000.

The Static Thrust Characterization Of The Quatra Aerrow Q100xl Engine For Flight Performance Prediction Of The 1/3-Scaled Cessna 172p Model, Joon Fui Ho

Master's Theses - Daytona Beach

The purpose of this research is to predict the thrust as a function of forward flight velocity required for the one-third-scaled Cessna 172P. This model was designed to verify scaling laws. Therefore, it is important that it be aerodynamically scaled and that it have similar thrust characteristic as that of the full scale Cessna 172P. Several propellers and two Quatra Aerrow Q100XL two-cycle engines were acquired for this research project. Three propellers were selected to undergo a series of static thrust testing. The measured static thrust was then used to predict the flight performance of each tested propellers with the …

Curvilinear Interface Methodology For Finite-Element Applications, Ollie James Rose

Mechanical & Aerospace Engineering Theses & Dissertations

Recent trends in design and manufacturing suggest a tendency toward multiple centers of specialty which results in a need for improved integration methodology for dissimilar finite element or CFD meshes. Since a typical finite element or CFD analysis requires about 50% of an engineers effort to be devoted to modeling and input, there is a need to advance the state-of-the-art in modeling, methodology. These two trends indicate a need to for the capability to combine independently-modeled configurations in an automated and robust way without the need for global remodeling. One approach to addressing this need is the development of interfacing …

The Airline Quality Rating 2000, Brent D. Bowen, Dean Headley, Uno Aviation Institute

Faculty Books and Monographs

UNOAI Report 2000-2

The Airline Quality Rating (AQR) was developed and first announced in early 1991 as an objective method of comparing airline performance on combined multiple criteria. This current report, Airline Quality Rating 2000, reflects monthly Airline Quality Rating scores for 1999. AQR scores for the calendar year 1999 are based on 14 elements that focus on airline performance areas important to air travel consumers.

The Airline Quality Rating 2000 is a summary of month-by-month quality ratings for the ten major domestic U.S. airlines operating during 1998. Using the Airline Quality Rating system of weighted averages and monthly performance …

Unmanned Research Vehicle (Urv): Development, Implementation, & Flight Test Of A Mimo Digital Flight Control System Designed Using Quantitative Feedback Theory, Constantine H. Houpis, Steven J. Rasmussen

Faculty Publications

The Quantitative Feedback Theory (QFT) design technique, which has the ability to bridge the gap between theory and the real-world control design problem, is utilized in the design of a MIMO digital flight control system for an unmanned research vehicle (URV) that is presented in this paper. The design illustrates how the real-world knowledge of the plant to be controlled and the desired performance specifications can be utilized in trying to achieve a successful robust design for a nonlinear control problem. This paper presents some of the issues involved in developing, implementing, and flight testing a flight control system (FCS) …