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Articles 1531 - 1560 of 1867
Full-Text Articles in Aerospace Engineering
Katysat: Kids Aren’T Too Young For Satellites, Robert J. Twiggs, Ben Yuan
Katysat: Kids Aren’T Too Young For Satellites, Robert J. Twiggs, Ben Yuan
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs and Bob Yuan titled "Katysat: Kids Aren’t Too Young for Satellites" from February 8, 2005.
An Existing Global Heptane Mechanism Augmented With Diffusive Transport, Michael R. Foster, Howard Pearlman
An Existing Global Heptane Mechanism Augmented With Diffusive Transport, Michael R. Foster, Howard Pearlman
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
The couplings between diffusive transport and the temperature and species concentration distributions associated with low and intermediate temperature heptane oxidation are explored using an existing four-step heptane mechanism, tuned for elevated pressures. The energy and species concentration equations are augmented with diffusive fluxes for heat and species and solved numerically in a one-dimensional domain. The ignition delay times are also tabulated and compared with the zero-dimensional data reported in the literature.
Control System Design And Simulation Of Spacecraft Formations, Daniel Dyer
Control System Design And Simulation Of Spacecraft Formations, Daniel Dyer
Master's Theses - Daytona Beach
The objective of this thesis is to analyze an effective control scheme for a formation of spacecraft, implement that control, and provide a 3-D simulation. The thesis first summarizes the progress made in formation flight control schemes and then provides a theoretical framework for the control system design. Using established control design techniques, feedback laws are constructed to control both rotational and translational motion of a group of spacecraft. Computer simulations are carried out using Matlab to generate the ephemeris and attitude data, which are exported to Satellite Tool Kit (STK) to create animations. The process by which Matlab is …
The Katysat Project: Kids Aren’T Too Young (For Satellites), Benjamin Yuan
The Katysat Project: Kids Aren’T Too Young (For Satellites), Benjamin Yuan
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Benjamin Yuan titled "The KatySat Project: Kids Aren’t Too Young (for satellites)" from April 14, 2005.
Real Space Projects For University Student Education, Robert J. Twiggs
Real Space Projects For University Student Education, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Real Space Projects for University Student Education" from November 17, 2004.
Stanford University Antarctic Development Programs, Robert J. Twiggs
Stanford University Antarctic Development Programs, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford University Antarctic Development Programs" from October 27, 2004.
Multi Application Survivable Tether: Mast, Eric P. Lee
Multi Application Survivable Tether: Mast, Eric P. Lee
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Eric P. Lee titled "Multi Application Survivable Tether MAST" from October 19, 2004.
Systems Engineering Education Via Real Life – Hands On Projects, Robert J. Twiggs
Systems Engineering Education Via Real Life – Hands On Projects, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Systems Engineering Education Via Real Life – Hands on Projects" from October 14, 2004.
2005 Cansat Competition Guide, Robert J. Twiggs
2005 Cansat Competition Guide, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A guide titled "2005 CanSat Competition Guide" for the ARLISS Project from October 11, 2004.
Stanford To The Moon, Robert J. Twiggs
Stanford To The Moon, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford to the Moon" on October 2, 2004.
2005 Cansat Competition Guide, Robert J. Twiggs
2005 Cansat Competition Guide, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A guide created by Professor Bob Twiggs titled "2005 CanSat Competition Guide" from September 7, 2004.
Analytical Solution For Low-Thrust Minimum Time Control Of A Satellite Formation, John Sang-Pil Seo
Analytical Solution For Low-Thrust Minimum Time Control Of A Satellite Formation, John Sang-Pil Seo
Theses and Dissertations
Satellite formations or distributed satellite systems provide advantages not feasible with single satellites. Efficient operation of this platform requires the use of optimal control of the entire satellite formation. While the optimal control theory is well established, only a very simple dynamical system affords an analytical solution. Any practical optimal control problem solves the resulting two-point boundary value (TPBV) problem numerically. The relative satellite dynamics using Hill's coordinate system and approximations made by Clohessy and Wiltshire, combined with body-fixed thruster control, result in a linearized dynamic system. This dissertation provides the analysis for the minimum time satellite formation control by …
Modeling Launch Vehicle Success Using Artificial Neural Networks, Jennifer A. Schuck
Modeling Launch Vehicle Success Using Artificial Neural Networks, Jennifer A. Schuck
Master's Theses - Daytona Beach
Expendable launch vehicles in the United States currently have a reliability of 92%. The failures that do occur cost millions of dollars in spacecraft replacement, lost revenue, and other expenses. These costs are passed on in higher insurance rates and launch vehicle price. If the launch outcome of the launch vehicles could be better predicted, the overall cost of launching payloads into space would decrease. This study used artificial neural networks to model the overall launch outcome of a launch vehicle so that the results of a launch could be predicted. Two neural network architectures--MLP and fuzzy ARTMAP--were trained on …
United States Antartic Program: Aws-Amrc-Amps Annual Joint Meeting, Kathie Hill
United States Antartic Program: Aws-Amrc-Amps Annual Joint Meeting, Kathie Hill
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Kathie Hill titled "United States Antartic Program: AWS-AMRC-AMPS Annual Joint Meeting" from June 4, 2004.
Status Report On The Antarctic Meteorological Research Centermay 2003 To May 2004, Matthew A. Lazzara, Charles R. Stearns, Linda M. Keller, Jessica A. Staude
Status Report On The Antarctic Meteorological Research Centermay 2003 To May 2004, Matthew A. Lazzara, Charles R. Stearns, Linda M. Keller, Jessica A. Staude
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Matthew A. Lazzara, Shelley L. Knuth, Charles R. Stearns, Linda M. Keller, and Jessica A. Staude titled "Status Report on the Antarctic Meteorological Research CenterMay 2003 to May 2004" from June 8, 2004.
Mcmurdo Station Fog Climatology: 1973-1998, Matthew A. Lazzara
Mcmurdo Station Fog Climatology: 1973-1998, Matthew A. Lazzara
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "McMurdo Station Fog Climatology:1973-1998" from June 8, 2004.
Meteorological Satellite Status Report: A Sample Of Key Developments, Matthew A. Lazzara
Meteorological Satellite Status Report: A Sample Of Key Developments, Matthew A. Lazzara
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Matthew A. Lazzara titled "Meteorological Satellite Status Report: A Sample of Key Developments" June 8, 2004.
Antarctic Automatic Weather Station (Aaws), Antarctic Mesoscale Prediction System (Amps), And Antarctic Meteorological Research Center (Amrc): Joint Annual Meeting, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Antarctic Automatic Weather Station (AAWS), Antarctic Mesoscale Prediction System (AMPS), and Antarctic Meteorological Research Center (AMRC) Joint Annual Meeting" from June 8, 2004.
Plans For 2004/2005 Mcmurdo Based Operations, John Cassano, Thomas R. Parish
Plans For 2004/2005 Mcmurdo Based Operations, John Cassano, Thomas R. Parish
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Joh Cassano and Thomas R. Parish titled "Plans for 2004/2005 Mcmurdo Based Operations" from June 7, 2004.
Unr Student Cansat Projects In Aerospace, J. C. Lacombe
Unr Student Cansat Projects In Aerospace, J. C. Lacombe
Robert "Bob" Twiggs STEM Education Collection
An article written by J. C. LaCombe titled "UNR Student CanSat Projects in Aerospace" from April 1, 2004.
Quakesat: Low Cost University/Commercial Nanosatellite Collaboration, Robert J. Twiggs, James Cutler, Eric Tapio, Allen Lorenz, Tom Bleier
Quakesat: Low Cost University/Commercial Nanosatellite Collaboration, Robert J. Twiggs, James Cutler, Eric Tapio, Allen Lorenz, Tom Bleier
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Tom Bleier, James Cutler, Eric Tapio, Allen Lorenz, and Bob Twiggs titled "QuakeSat:Low CostUniversity/Commercial Nanosatellite Collaboration" from March 10, 2004.
Data Sorting And Orbit Determination Of Tethered Satellite Systems, Mark J. Faulstich
Data Sorting And Orbit Determination Of Tethered Satellite Systems, Mark J. Faulstich
Theses and Dissertations
Tethered satellite system end masses do not obey the normal laws of motion developed for determining their orbits. In addition, tethered satellite systems cause unique problems for satellite tracking because there are potentially two or more objects which may be tracked. This thesis provides insight into these issues by developing a method of sorting out observation data of tethered satellite systems into their appropriate end mass and providing an estimate on the center of mass orbit of the tethered satellite system. The method used to accomplish both of these tasks is optimization of an estimated simulated orbit. This orbit estimate …
Overview Of The Stanford Satellite Program, Robert J. Twiggs
Overview Of The Stanford Satellite Program, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Overview of the Stanford Satellite Program" from March 4, 2004.
Characterization And Ground Test Of An Inflatable Rigidizable Space Experiment, Steven N. Lindemuth
Characterization And Ground Test Of An Inflatable Rigidizable Space Experiment, Steven N. Lindemuth
Theses and Dissertations
As greater capability is demanded of space-based assets, their size and complexity are growing. Inflatable, rigidizable structures offer significant improvements in the areas of weight, size, and complexity over traditional mechanically deployed systems. These structures are not well understood and little testing of them has been done in the space environment. Widespread acceptance of these technologies will not be achieved without significant reduction in the risk of using inflatable, rigidizable structures in space. The goal of this experiment is to verify and validate ground testing of small tubular truss structures for use in space. This experiment builds on previous research …
Geometric Approach To Orbital Formation Mission Design, Matthew J. Press
Geometric Approach To Orbital Formation Mission Design, Matthew J. Press
Theses and Dissertations
For distributed remote sensing architectures to be useful for collecting data, it is essential to have a methodology for relating orbital formation parameters to remote sensing requirements. Utilizing the characteristics of formation parameters, an orbital design approach is developed that establishes a satellite formation from a desired instantaneous spatial distribution as viewed from a target ground site. To maintain a conceptually basic representation, a geometric approach is used to develop the correlating algorithm. This tool will enable mission planning for orbital formations as well as future concept exploration.
Infrared Methods For Daylight Acquisition Of Leo Satellites, Joel E. Nelson
Infrared Methods For Daylight Acquisition Of Leo Satellites, Joel E. Nelson
Theses and Dissertations
Raven is an award-winning optical system design paradigm that couples commercially available hardware and software along with custom data analysis and control software to produce low-cost, autonomous, and very capable space surveillance systems. The first product of the Raven program was a family of telescopes capable of generating world-class optical observation data of deep-space satellites. The key to this system was the use of astrometric techniques for position and brightness data. Astrometry compares a satellite to the star background within the sensor field of view; since the position and brightness of the star-field is well known in star catalogs, accurate …
Performance Study Of Two-Stage-To-Orbit Reusable Launch Vehicle Propulsion Alternatives, Marc A. Brock
Performance Study Of Two-Stage-To-Orbit Reusable Launch Vehicle Propulsion Alternatives, Marc A. Brock
Theses and Dissertations
This study investigated the performance of five Two-Stage-To-Orbit reusable launch vehicles (RLV), with stages propelled by rocket engines, turbojet engines and Rocket Based Combined Cycle (RBCC) engines. Horizontal versus vertical takeoff launch and direct versus lifting ascent trajectories were also studied. A method was conceived using a 3 degree of freedom optimization program, stage inert mass fractions, and a fixed gross takeoff weight (GTOW) of 1,000,000 lbf to determine each RLVs performance based on payload weight delivered to orbit and total vehicle inert weight. RLV trajectory constraints, mass fractions, engine performance, and aerodynamics were assumed from literature of similar RLVs …
Hands-On Fun & Games In Space Also, On Land, Robert J. Twiggs
Hands-On Fun & Games In Space Also, On Land, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Hands-On Fun & Games in Space Also, on Land" from January 12, 2004.
Space Adventures By Stanford Students & Mentors, Robert J. Twiggs
Space Adventures By Stanford Students & Mentors, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Space Adventures by Stanford Students & Mentors" from December 10, 2003.
A History Of Space Security, Ibpp Editor
A History Of Space Security, Ibpp Editor
International Bulletin of Political Psychology
This article provides a conceptual infrastructure for thinking about the history of space security.