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Articles 1351 - 1380 of 1867
Full-Text Articles in Aerospace Engineering
Isc Kosmotras Dnepr Cluster Launches: Large-Scale Opportunities For Small Satellites, Isc Kosmotras
Isc Kosmotras Dnepr Cluster Launches: Large-Scale Opportunities For Small Satellites, Isc Kosmotras
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by the ISC Kosmotras titled "ISC Kosmotras DNEPR Cluster Launches: Large-Scale Opportunities for Small Satellites" from September 9, 2009.
Using Small Satellites For Low Cost Space Education & Science Missions, Robert J. Twiggs
Using Small Satellites For Low Cost Space Education & Science Missions, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Using Small Satellites for Low Cost Space Education & Science Missions" from September 8, 2009.
Itu Radio Regulations Related To N-Gso Satellites, International Telecommunication Union
Itu Radio Regulations Related To N-Gso Satellites, International Telecommunication Union
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by the International Telecommunication Union titled "ITU Radio Regulations related to N-GSO satellites" from September 8, 2009.
Indian Launch Vehicle Programme: An Overview, Indian Space Research Organization
Indian Launch Vehicle Programme: An Overview, Indian Space Research Organization
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Indian Space Research Organization titled "Indian Launch Vehicle Programme: An Overview" from September 6, 2009.
Spacecraft Attitude Control (Mission Design), Norhizam Hamzah
Spacecraft Attitude Control (Mission Design), Norhizam Hamzah
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Norhizam Hamzah titled "Spacecraft Attitude Control (Mission Design)" from September 10, 2009.
Turkish Satellite Technology Applications For Sustainable Development And Capacity Building, Burcu Dikmen
Turkish Satellite Technology Applications For Sustainable Development And Capacity Building, Burcu Dikmen
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Burcu Dikmen titled "Turkish Satellite Technology Applications for Sustainable Development and Capacity Building" from September 8, 2009.
The Role Of Education In Small Satellite Programmes, Olaleye Salu
The Role Of Education In Small Satellite Programmes, Olaleye Salu
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Olaleye Salu titled "The Role of Education in Small Satellite Programmes" from September 9, 2009.
On-Board Orbit Determination And 3-Axis Attitude Determination For Picosatellite Applications, John Arthur Bowen
On-Board Orbit Determination And 3-Axis Attitude Determination For Picosatellite Applications, John Arthur Bowen
Master's Theses
This thesis outlines an orbit determination and 3-axis attitude determination system for use on orbit as applicable to 1U CubeSats and other picosatellites. The constraints imposed by the CubeSat form factor led to the need for a simple configuration and relaxed accuracy requirements. To design a system within the tight mass, volume, and power constraints inherent to CubeSats, a balance between hardware complexity, software complexity and accuracy is sought. The proposed solution consists of a simple orbit propagator, magnetometers with a magnetic field look-up table, Sun sensors with an analytic Sun direction model, and the TRIAD method to combine vector …
A Microfabricated Segmented-Involute-Foil Regenerator For Enhancing Reliability And Performance Of Stirling Engines: Phase Iii Final Report For The Radioisotope Power Conversion Technology Nra Contract Nas3-03124, Mounir B. Ibrahim, David Gedeon, Gary Wood, Jeffrey Mclean
A Microfabricated Segmented-Involute-Foil Regenerator For Enhancing Reliability And Performance Of Stirling Engines: Phase Iii Final Report For The Radioisotope Power Conversion Technology Nra Contract Nas3-03124, Mounir B. Ibrahim, David Gedeon, Gary Wood, Jeffrey Mclean
Mechanical Engineering Faculty Publications
Under Phase III of NASA Research Announcement contract NAS3-03124, a prototype nickel segmented-involute-foil regenerator was microfabricated and tested in a Sunpower Frequency-Test-Bed (FTB) Stirling convertor. The team for this effort consisted of Cleveland State University, Gedeon Associates, Sunpower Inc. and International Mezzo Technologies. Testing in the FTB convertor produced about the same efficiency as testing with the original random-fiber regenerator. But the high thermal conductivity of the prototype nickel regenerator was responsible for a significant performance degradation. An efficiency improvement (by a 1.04 factor, according to computer predictions) could have been achieved if the regenerator was made from a low-conductivity …
Store And Forward Routing For Sparse Pico-Satellite Sensor Networks With Data-Mules, Trevor Joseph Koritza
Store And Forward Routing For Sparse Pico-Satellite Sensor Networks With Data-Mules, Trevor Joseph Koritza
Master's Theses
Satellites are playing an increasingly important role in collecting scientific information, providing communication services, and revolutionizing navigation. Until recently satellites were large and very expensive, creating a high barrier to entry that only large corporations and government agencies could overcome. In the past few years the CubeSat project at California Polytechnic University in San Luis Obispo (Cal Poly) has worked to refine the design and launching of small, lightweight, and less expensive satellites called pico-satellites, opening space up to a wider audience. Now that Cal Poly has the launch logistics and hardware under control, a new problem has arisen. These …
Cubesats Present Capabilities, Robert J. Twiggs
Cubesats Present Capabilities, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "CubeSats Present Capabilities" from May 20, 2009.
Robotics - One Of The Steps To Space Exploration, Robert J. Twiggs
Robotics - One Of The Steps To Space Exploration, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Robotics - one of the steps to space exploration" from May 9, 2009.
Robotics - One Of The Steps To Space Exploration, Robert J. Twiggs
Robotics - One Of The Steps To Space Exploration, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Robotics - one of the steps to space exploration" from May 9, 2009.
Smallsats, Robert J. Twiggs
Smallsats, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "SmallSats" from April 30 2009.
Satellite Earth Observation And Surveillance Payloads, Rainer Sandau
Satellite Earth Observation And Surveillance Payloads, Rainer Sandau
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Rainer Sandau titled "Satellite Earth observation and surveillance payloads" from April 9, 2009.
Distributed Satellite Systems For Earth Observation And Surveillance, Robert J. Twiggs
Distributed Satellite Systems For Earth Observation And Surveillance, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Rainer Sandau titled "Distributed satellite systems for Earth observation and surveillance" from April 7, 2009.
Miniaturization Techniques To Realize Very Small Satellites, Robert J. Twiggs
Miniaturization Techniques To Realize Very Small Satellites, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Miniaturization Techniques to Realize Very Small Satellites" from April 6, 2009.
Subsystem Realization Actuators And Sensors For Satellite Attitude Control For Very Small Satellites, Robert J. Twiggs
Subsystem Realization Actuators And Sensors For Satellite Attitude Control For Very Small Satellites, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Subsystem Realization Actuators and Sensors for Satellite Attitude Control for very Small Satellites" from April 1, 2009.
(U) Cubesat Experiments (Qb X), Patrick Bournes, Dave Williamson
(U) Cubesat Experiments (Qb X), Patrick Bournes, Dave Williamson
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Patrick Bournes and Dave Williamson titled "(U) CubeSat Experiments (Qb X)" from April of 2009.
Low-Cost Missions At The Space Flight Laboratory, Robert E. Zee
Low-Cost Missions At The Space Flight Laboratory, Robert E. Zee
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Robert E. Zee titled "Low-Cost Missions at the Space Flight Laboratory" from March 24, 2009.
Reusable Launch Vehicle Design Implications For Regeneration Time, Carlos Alberto Molina
Reusable Launch Vehicle Design Implications For Regeneration Time, Carlos Alberto Molina
Theses and Dissertations
In last few years, the Air Force Research Laboratory sponsored several research projects on a Reusable Launch Vehicles (RLV) whose design, operation, and logistics requirements are intended to be much simpler than for the Space Shuttle. As a part of these efforts, previous researchers developed a model that simulated the post-landing, ground maintenance and prelaunch operations of a RLV in order to evaluate how its design parameters affect the logistics operations. The next logical step is to investigate the effects and interactions of all factors used in the existing simulation model in a single experiment that considers the huge number …
An Engineering Trade Space Analysis For A Space-Based Hyperspectral Chromotomographic Scanner, Phillip Sheirich
An Engineering Trade Space Analysis For A Space-Based Hyperspectral Chromotomographic Scanner, Phillip Sheirich
Theses and Dissertations
Hyperspectroscopy for fast transient events such as battlefield explosions is an undeveloped area of spectral imaging. This thesis is a discussion of issues involved with taking a laboratory design for a rotating prism hyperspectral chromotomographic (CT) instrument and producing a first approximation satellite payload design, operating scheme and trade space analysis to support demonstration of this technology in low-earth orbit. This instrument promises the capability of adding a time dimension to the normal spatial and spectral data produced by most hyperspectral imagers. The ultimate goal is to conduct experiments demonstrating the ultimate viability of spectral definition of transient combustion events …
Near Real-Time Closed-Loop Optimal Control Feedback For Spacecraft Attitude Maneuvers, C. Douglas Mcfarland
Near Real-Time Closed-Loop Optimal Control Feedback For Spacecraft Attitude Maneuvers, C. Douglas Mcfarland
Theses and Dissertations
Optimization of spacecraft attitude maneuvers can significantly reduce attitude control system size and mass, and extend satellite end-of-life. Optimal control theory has been applied to solve a variety of open-loop optimal control problems for terrestrial, air, and space applications. However, general application of real-time optimal controllers on spacecraft for large slew maneuvers has been limited because open-loop control systems are inherently vulnerable to error and the computation necessary to solve for an optimized control solution is resource intensive. This research effort is focused on developing a near real-time optimal control (RTOC) system for spacecraft attitude maneuvers on the Air Force …
Finite Element Model Optimization Of The Falconsat-5 Structural Engineering Model, Cole C. Doupe
Finite Element Model Optimization Of The Falconsat-5 Structural Engineering Model, Cole C. Doupe
Theses and Dissertations
Space launch vehicles produce tremendously harsh environments for their payloads. One of the worst contributors to this harsh environment is vibration. Launch vehicle contractors require accurate dynamic models in order to perform coupled loads analyses with each payload to mitigate risks. Accurate predictions of the dynamic response of the payload are not achieved easily. The Finite Element (FE) method has proven to be the best approach in creating accurate dynamic models of complex structures. To improve the agreement between an FE model and the structure it represents, a common practice is to `tune' or adjust parameters of the FE model …
Characterizing The Exhaust Plume Of The Three-Electrode Micro Pulsed Plasma Thrusters, Myeongkyo Seo
Characterizing The Exhaust Plume Of The Three-Electrode Micro Pulsed Plasma Thrusters, Myeongkyo Seo
Theses and Dissertations
Three-electrode micro-PPTs are a new version of two electrode micro-PPTs devices. Performance predictions and contamination expectations are essential characteristics needed by satellite designers. In order to focus on thruster specific impulse, thrust and efficiency, measuring the exhaust velocity or impulse bit and propellant consumption rate is essential. While this is not always possible to measure directly, focusing on the ejected mass from the PPT provides significant information allowing determination of these performance statistics. Specifically, focusing on exhaust angle distribution and velocity of the exhaust particles is the emphasis of this work. The results show that the three-electrode micro-PPT is more …
Cubesats, Any Applications?, Robert J. Twiggs
Cubesats, Any Applications?, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "CubeSats, Any Applications?" from March 3, 2009.
Miniaturization Techniques To Realize Very Small Satellites, Robert J. Twiggs
Miniaturization Techniques To Realize Very Small Satellites, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Miniaturization techniques to realize very small satellites" from April 1, 2009.
Fun & Games With Space Projects, Robert J. Twiggs
Fun & Games With Space Projects, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Fun & Games with Space Projects" from February 27, 2009.
Space In Education, Robert J. Twiggs
Space In Education, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Space in Education" from February 20, 2009.
Space Program For Kentucky, Robert J. Twiggs
Space Program For Kentucky, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Space Program for Kentucky" from February 15, 2009.