Engineering Commons^™

Experience Black Rock, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs titled "Experience Black Rock" from November 26, 2006.

Arliss 2006: Soka University Rover Team Rocks, Soka University Rover Team

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Soka University Rover Team titled "ARLISS 2006: Soka University Rover Team ROCKS" from November 26, 2006.

Robust Control Techniques Enabling Duty Cycle Experiments Utilizing A 6-Dof Crewstation Motion Base, A Full Scale Combat Hybrid Electric Power System, And Long Distance Internet Communications, Marc Compere, Jarrett Goodell, Miguel Simon, Wilford Smith, Mark Brudnak

Publications

The RemoteLink effort supports the U.S. Army's objective for developing and fielding next generation hybrid-electric combat vehicles. It is a distributed soldierin- the-Ioop and hardware-in-the-Ioop environment with a 6-DOF motion base for operator realism, a full-scale combat hybrid electric power system, and an operational context provided by OneSAF. The driver/gunner crewstations rest on one of two 6-DOF motion bases at the U.S. Army TARDEC Simulation Laboratory (TSL). The hybrid power system is located 2,450 miles away at the TARDEC Power and Energy System Integration Laboratory (P&E SIL). The primary technical challenge in the RemoteLink is to operate both laboratories together …

Thermal Enhancement Of Stacked Dies Using Thermal Vias, Baekyoung Sung

Mechanical and Aerospace Engineering Theses - Archive

Following Moore's law, the number of transistors on a die continues to rise and has recently exceeded a billion on high end processors. In light of the convergence of technology, power requirements is becoming a serious concern even on low density interconnect systems such as cellular phones and personal digital assistants. Also, in order to minimize foot prints, the recent trend in packaging is stacking. The stacking, however, creates challenges in cooling and especially if one is to include logic in the stack. The primary heat flow path for stacking is through the substrate and as the number of stacks …

Integrated Guidance And Control Of Missiles With Θ-D Method, Ming Xin, S. N. Balakrishnan, Ernest J. Ohlmeyer

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A new suboptimal control method is proposed in this study to effectively design an integrated guidance and control system for missiles. Optimal formulations allow designers to bring together concerns about guidance law performance and autopilot responses under one unified framework. They lead to a natural integration of these different functions. by modifying the appropriate cost functions, different responses, control saturations (autopilot related), miss distance (guidance related), etc., which are of primary concern to a missile system designer, can be easily studied. A new suboptimal control method, called the θ-D method, is employed to obtain an approximate closed-form solution to this …

Capillary-Driven Flows Along Rounded Interior Corners, Yongkang Chen, Mark M. Weislogel, Cory L. Nardin

Mechanical and Materials Engineering Faculty Publications and Presentations

The problem of low-gravity isothermal capillary flow along interior corners that are rounded is revisited analytically in this work. By careful selection of geometric length scales and through the introduction of a new geometric scaling parameter Tc, the Navier–Stokes equation is reduced to a convenient∼O(1) form for both analytic and numeric solutions for all values of corner half-angle α and corner roundedness ratio λ for perfectly wetting fluids. The scaling and analysis of the problem captures much of the intricate geometric dependence of the viscous resistance and significantly reduces the reliance on numerical data compared with several previous solution methods …

Rideshare Conference, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "RideShare Conference" from October 11, 2006.

A New Approach To Satellite Power Systems, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "A New Approach To Satellite Power Systems" from October 8, 2006.

Suitsat-2, Lou Mcfadin, Frank Bauer

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Lou McFadin and Frank Bauer titled "SuitSat-2" from October 8, 2006.

Stanford University’S Small Satellite Program: Amsat Space Symposium, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford University’s Small Satellite Program: AMSAT Space Symposium" from October 7, 2006.

Optimization Of Active Rendezvous Trajectories By Genetic Algorithms, Marie Emmanuelle Ricour

Master's Theses - Daytona Beach

Trajectory optimization is and will remain a hot topic in the engineering field. Because analytical or exact solutions are often difficult and sometimes impossible to compute, there is a need for alternative and efficient methods. UnderWater Vehicles (UWV) trajectories and rendezvous trajectories of continuous low-thrust spacecraft are examined. One of the methods to solve such problems is the Genetic Algorithm (GA) method. In this work, a GA has been developed using Matlab®. It treats possible solutions to the studied problems as individuals and eventually converges to an optimal or near optimal solution. Genetic Algorithms have been used previously to solve …

Evaluation Of Probabilistic Methodology For Predicting Satellite Tracking Resources, Matthew Lynn Stubbe

Master's Theses - Daytona Beach

This research evaluates a probabilistic methodology for estimating the ability of satellite tracking networks to provide tracking and data acquisition services to large constellations of satellites. This approach, developed by Hagar is evaluated using Monte Carlo simulations of optimal satellite contact scheduling on a tracking network for a certain class of satellites. The actual results of the scheduled Monte Carlo simulations were then compared to the predicted values computed with Hagar's methodology for a range constellation and network sizes. Comparison methods include percent difference, a Wilcoxon signed ranks test and a Mann-Whitney U test.

The Monte Carlo simulations were run …

Flow Control Of Airfoil At Post-Stall Conditions By Multiple Frequency Applied Saado Jets, A. Şamil Demirsöz

Mechanical & Aerospace Engineering Theses & Dissertations

Flow separation over lifting aerodynamic components, such as airfoils and wings, occurs during stall conditions which are caused by adverse changes (i.e.; high angle of attack, inflow conditions, etc.) in the operating conditions of aerodynamic components. During stall conditions, the flow over airfoil loses its momentum, creating high pressure zones on the upper surface of the airfoil and even a small increase in pressure causes the fluid particles to stop and separate to a low pressure zone. In order to eliminate the flow separation, the low momentum flow should be removed in order to maintain the high momentum and low …

Come-Back Competition: 2006 Summary, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs titled "Come-Back Competition: 2006 Summary" from September 23, 2006.

Arliss 2006 Cansat: Da Vinci, Matsunaga Lab, Tokyo Institute Of Technology

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Matsunaga Lab of Tokyo Institute of Technology titled "ARLISS 2006 CanSat: Da Vinci" from September 23, 2006.

Arliss 2006 Report, Tohoku University Sekiguteam

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Tohoku University Sekiguteam  titled "ARLISS 2006 Report" from September 23, 2006.

Arliss 2006: University Of Tokyo & Seoul National University, Team Snut

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created Team SNUT titled "ARLISS 2006: University of Tokyo & Seoul National University" from September 23, 2006.

Samurai, University Of Tokyo Rover Team

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the University of Tokyo Rover Team titled "Samurai" from September 23, 2006.

Cbc-03: Nihon University, Yuta Chiba, Yuta Kujira

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Yuta Chiba and Yuta Kujira titled "CBC-03: Nihon University" from September 23, 2006.

Airsat Project: Design And Construction Of An Autonomous Atmospheric Probe, Jornados De Jovenes Cientificos

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Jornadas de Jóvenes Científicos titled "AIRSat Project: Design and construction of an autonomous atmospheric probe" from September 23, 2006.

T. I. Tech Arliss Team: Spopovic, Tokyo Insititute Of Technology Arliss Team

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Tokyo Insititute of Technology ARLISS Team titled "T. I. Tech ARLISS Team: Spopovic" from September 23, 2006.

Arliss 2006: Comeback Competition Report, Tohoku University Yashago Team

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Tohoku University Yashago Team titled "ARLISS 2006: Comeback Competition Report" from September 22, 2006.

Result Of Arliss "Coolrunning Ver. 3", Osamu Kitagawara, Yusuke Saisoh

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Osamu Kitagawara and Yusuke Saison titled "Result of ARLISS CoolRunning Ver. 3" from September 22, 2006.

Aoyama Gakuin University: I Can Fly, Kuninori Togai, Satoshi Adachi, Naoki Kitabayashi

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by the Aoyama Gakuin University Space Club on September 22, 2006.

Mavericks & 2007 International Civilian Space Competition, Thomas M. Atchison

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Thomas M. Atchison titled "Mavericks & 2007 International Civilian Space Competition" from September 22, 2006.

Error Allocation In Complex Systems Design, Robert A. Mcdonald

Aerospace Engineering

A fidelity trade environment was conceived, formulated, developed, and demonstrated. This development relied on the advancement of enabling techniques including error propagation, metamodeling, and information management. These techniques were integrated with an existing commercial systems design framework and an intuitive graphical interface to create a fidelity trade environment. A sensitivity approach to the propagation of error through complex systems was developed. This approach relied on the system sensitivity matrix to model the behavior of a complex system as a whole. In verification tests, the sensitivity approach provided approximate results substantially similar to a Monte Carlo approach that was many orders …

Lightweight In-Plane Actuated Deformable Mirrors For Space Telescopes, Michael J. Shepherd

Theses and Dissertations

This research focused on lightweight, in-plane actuated, deformable mirrors, with the ultimate goal of developing a 20- meter light gathering aperture for space telescopes. The 0.127 meter diameter deformable mirror small scale testbed was modelled infinite elements using MSC.Nastran software and then used as a basis for a quasi-static controller. Experimental tracking of Zernike tip, tilt, and defocus modes was accomplished. The analytical solutions to plate-membrane and beam-string ordinary differential equations were developed. A simplified approach to modelling the axisymmetric cases was also presented. A novel static control strategy, the Modal Transformation Method, was developed to form Zernike surfaces within …

Dynamics And Control Of Tethered Satellite Formations For The Purpose Of Space-Based Remote Sensing, Kurt A. Vogel

Theses and Dissertations

This dissertation assesses the utility of tethered satellite formations for the space-based remote sensing mission. Energy dissipation is found to have an adverse effect on foundational rigid body (Likins-Pringle) equilibria. It is shown that a continuously earth-facing equilibrium condition for a fixed-length tethered system does not exist since the spin rate required for the proper precession would not be high enough to maintain tether tension. The range of required spin rates for steady-spin motion is numerically defined here, but none of these conditions can meet the continuously earth-facing criteria. Of particular note is the discovery that applying certain rigid body …

Development Of A Low-Latency, High Data Rate, Differential Gps Relative Positioning System For Uav Formation Flight Control, Stephen J. Comstock

Theses and Dissertations

In order for Unmanned Aerial Vehicles (UAVs) to be able to fly missions currently performed by manned aircraft, they must be able to conduct in-flight refueling. Additionally, significant fuel savings can be realized if multiple UAV's are able to fly in precise formation and align wingtip vortices. In either case, the precise relative position between the aircraft must be known to an accuracy of only a few centimeters. Previous research at the Air Force Institute of Technology culminated in the development of a relative positioning system for manned aircraft. This thesis presents the development of the next-generation system designed for …

Navigation Using Signals Of Opportunity In The Am Transmission Band, Jonathan A. Mcellroy

Theses and Dissertations

Maintaining a precision navigation solution both in a GPS hostile jamming environment and also in a GPS non-compatible terrain area is of great importance. To that end, this thesis evaluates the ability to navigate using signals from the AM band of the electromagnetic spectrum (520 to 1710 kHz). Navigation position estimates are done using multi-lateration techniques similar to GPS. However, pseudoranges are created using Time Difference of Arrival (TDOA) distances between a reference receiver and a mobile receiver, allowing the mobile receiver to obtain absolute position estimates over time. Four methods were developed for estimating the cross-correlation peak within a …