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Articles 1 - 30 of 53
Full-Text Articles in Space Vehicles
Optimal Attitude Control Of Agile Spacecraft Using Combined Reaction Wheel And Control Moment Gyroscope Arrays, Cole C. Doupe
Optimal Attitude Control Of Agile Spacecraft Using Combined Reaction Wheel And Control Moment Gyroscope Arrays, Cole C. Doupe
Theses and Dissertations
This dissertation explores the benefits of combined control moment gyroscope (CMG) and reaction wheel array (RWA) actuation for agile spacecraft. Agile spacecraft are capable of slewing to multiple targets in minimum time. CMGs provide the largest torque capability of current momentum exchange actuation devices but also introduce singularity events in operation. RWAs produce less torque capability than CMGs but can achieve greater pointing accuracy. In this research, a combined RWA and CMG (RWCMG) system is evaluated using analytical simulations and hardware experiments. A closed-loop control scheme is developed which takes advantage of the strengths of each actuator set.The CMGs perform …
Lightweight Deployment Mechanism Of Solar Arrays For Use In Cubesats, John Wood Ellis
Lightweight Deployment Mechanism Of Solar Arrays For Use In Cubesats, John Wood Ellis
Undergraduate Honors Capstone Projects
Cube satellites, also referred to as CubeSats, were developed in the late twentieth century, and have since served as a cost-effective method of gathering out-of-this-world data. The development of these small-scale satellites have helped universities and small companies worldwide to perform important experiments, as well as gather critical data in order to provide for further space exploration. Cube satellites are designed to be self-sustaining, by using solar cells to capture impinging thermal energy and convert it to power to be consumed by the electronics housed within the satellite itself. In order to function properly, these cells are extended in an …
Sub-Orbital Spaceflight – An Addition To Our Multi-Modal Transportation System, Scott Haeffelin
Sub-Orbital Spaceflight – An Addition To Our Multi-Modal Transportation System, Scott Haeffelin
Space Traffic Management Conference
The number of commercial spaceflights will be increasing by orders of magnitude over the next several decades. The current volume of space traffic can be managed on a case-by-case basis and there is little impact to the National Airspace System (NAS). This will change as more spaceports become operational, commercial sub-orbital flight companies begin serving their customers and as the cost of these flights begin to decrease. Current regulatory paths seek to allow the flexibility in the regulations for this industry to flourish while also maintaining a high standard of safety. There are, however, many nearsighted and old fashioned assumptions …
Lunar Icecube: Nextstep Lunar Cubesat Mission And Instrument Concept, Robert J. Twiggs
Lunar Icecube: Nextstep Lunar Cubesat Mission And Instrument Concept, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs associates titled "Lunar IceCube: NEXTSTEP Lunar Cubesat Mission and Instrument Concept" from November 12, 2015.
Estimating Terrace Agriculture: Implications Towards Archaeology And Ancient Civilizations, Zachary Burkhardt, Kel Markert
Estimating Terrace Agriculture: Implications Towards Archaeology And Ancient Civilizations, Zachary Burkhardt, Kel Markert
Von Braun Symposium Student Posters
No abstract provided.
Design And Development Of A Sensor Payload For Low-Altitude Rocket Deployment, Alex Christley
Design And Development Of A Sensor Payload For Low-Altitude Rocket Deployment, Alex Christley
Von Braun Symposium Student Posters
No abstract provided.
Design And Fabrication Of A Boosted Dart Rocket System, Davis Hunter, Bradley Henderson
Design And Fabrication Of A Boosted Dart Rocket System, Davis Hunter, Bradley Henderson
Von Braun Symposium Student Posters
No abstract provided.
Small Packages Can Get Big Results, Robert J. Twiggs
Small Packages Can Get Big Results, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint presentation created by Professor Bob Twiggs titled "Small Packages can get Big Results" from October 16, 2015.
Modular Heat Dissipation Technique For A Cubesat, Melih Eken
Modular Heat Dissipation Technique For A Cubesat, Melih Eken
Theses and Dissertations
In recent years, due to their many advantages, interest in larger scale CubeSats, such as 3U and 6U, has been increased. Correspondingly, dissipating the heat from the heat generating components in the CubeSat has become a challenge for thermal control. In this research, a modular approach was developed to dissipate heat from the overheating components in a CubeSat. To accomplish this, both experimental and computational methodologies were used. A 6U CubeSat was computationally modeled and the model correlated by experimental test results. Subsequently, validated CubeSat thermal model was used to design a modular heat dissipater. Validation and performance experiments of …
A Nonequilibrium Finite-Rate Carbon Ablation Model For Radiating Earth Re-Entry Flows, Christopher R. Alba
A Nonequilibrium Finite-Rate Carbon Ablation Model For Radiating Earth Re-Entry Flows, Christopher R. Alba
Theses and Dissertations
Vehicles entering planetary atmospheres at high speed require an ablative heat shield in order to withstand the high thermal energy flux to the body. The interaction between the ablative products and the flow field is not well characterized. Numerical simulations were conducted to investigate the influence of carbon ablation on shock layer radiation. Data collected from experiments performed in the X-2 expansion tunnel at the University of Queensland was used to compare to the simulations. The model was a short half-cylinder made of isomolded graphite and was tested in 8.6 km/s Earth entry flow. The model surface was heated within …
Brief Look At The Environment Of Space, Robert J. Twiggs
Brief Look At The Environment Of Space, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Brief Look at the Environment of Space" from September 10, 2015.
A Brief History Of Space - Sse 120 Session 1, Robert J. Twiggs
A Brief History Of Space - Sse 120 Session 1, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Session 01" from August 30, 2015.
A Brief History Of Space - Sse 120 Questions 01, Robert J. Twiggs
A Brief History Of Space - Sse 120 Questions 01, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 01" from August 26, 2015.
A Brief History Of Space - Sse 120 Questions 02, Robert J. Twiggs
A Brief History Of Space - Sse 120 Questions 02, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 02" from August 25, 2015.
A Brief History Of Space - Sse 120 Questions 04, Robert J. Twiggs
A Brief History Of Space - Sse 120 Questions 04, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 04" from August 25, 2015.
A Brief History Of Space - Sse 120 Questions 03, Robert J. Twiggs
A Brief History Of Space - Sse 120 Questions 03, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space - Questions 03" from August 25, 2015.
What Is Orbital Debris?, Robert J. Twiggs
What Is Orbital Debris?, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "What is Orbital Debris?" from August 24, 2015.
Brief Look At The Environment Of Space, Robert J. Twiggs
Brief Look At The Environment Of Space, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Brief Look at the Environment of Space" from August 24, 2015.
Orbital Debris Mitigation Policy And Unique Challenges For Small Satellites, J. C. Liou, David Jarkey
Orbital Debris Mitigation Policy And Unique Challenges For Small Satellites, J. C. Liou, David Jarkey
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by J. C. Liou and David Jarkey titled "Orbital Debris Mitigation Policy and Unique Challenges for Small Satellites" at the Small Satellite Conference on August 10, 2015.
Overview Of The Orbital Debris Problem, J. C. Liou
Overview Of The Orbital Debris Problem, J. C. Liou
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by J. C. Liou titled "Overview of the Orbital Debris Problem" at the Small Satellite Conference on August 10, 2015.
A Brief History Of Space - Sse 120, Robert J. Twiggs
A Brief History Of Space - Sse 120, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs on "A Brief History of Space" from August 5, 2015.
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Exploring New Lagrangian Cyclers To Enhance Science: Communications With Cubesat Technology, Pedro P. Llanos, Abdiel Santos Galindo, John Ford
Publications
This paper discusses the opportunities that abound by using the CubeSat technology to travel to and communicate with the International Space Station, explore space, monitor space weather, monitor space debris and perhaps travel to Mars.
The “Stratospheric Cricket Keeper” – Developing A Simple“Life-Support” Payload For High-Altitude Balloon Missions, Lucas Kramer, Chad Serba, James Flaten
The “Stratospheric Cricket Keeper” – Developing A Simple“Life-Support” Payload For High-Altitude Balloon Missions, Lucas Kramer, Chad Serba, James Flaten
2017 Academic High Altitude Conference
Exposure to the environmental conditions of “near-space” (AKA the stratosphere) is quickly fatal to nearly all forms of animal life. It is even challenging to build a sealable enclosure that can keep insects (crickets) alive through the dramatic and simultaneous pressure and temperature drops experienced during a high-altitude balloon mission. This poster describes the development of a rugged “cricket keeper” in which we were able to fly crickets to the stratosphere and, quoting the words of JFK, “return (them) safely to the earth!” This “life-support” payload had large windows (for the view!) and included Arduino-logged temperature and pressure sensors, an …
Orbit Estimation Of Non-Cooperative Maneuvering Spacecraft, Gary M. Goff
Orbit Estimation Of Non-Cooperative Maneuvering Spacecraft, Gary M. Goff
Theses and Dissertations
Due to the ever increasing congestion of the space environment, there is an increased demand for real-time situation awareness of all objects in space. An unknown spacecraft maneuver changes the predicted orbit, complicates tracking, and degrades estimate accuracies. Traditional orbit estimation routines are implemented, tested, and compared to a multiple model format that adaptively handles unknown maneuvers. Multiple Model Adaptive Estimation is implemented in an original way to track a non-cooperative satellite by covariance inflation and filtering-through a maneuver. Parameters for successful instantaneous maneuver reconstruction are analyzed. Variable State Dimension estimation of a continuously maneuvering spacecraft is investigated. A requirements …
Brief Look At The Environment Of Space, Robert J. Twiggs
Brief Look At The Environment Of Space, Robert J. Twiggs
Robert "Bob" Twiggs STEM Education Collection
A PowerPoint Presentation created by Professor Bob Twiggs titled "Brief Look at the Environment of Space" from June 17, 2015.
Structural Micrometeoroid And Radiation Shielding For Interplanetary Spacecraft, Jared Allen Ruekberg
Structural Micrometeoroid And Radiation Shielding For Interplanetary Spacecraft, Jared Allen Ruekberg
Master's Theses
This paper focused on two significant space forces that can affect the success of a spacecraft: the radiation and micrometeoroid environments. Both are looked at in the context of the region of space between Earth and Mars. The goal was create reference environments, to provide context to results of environmental modeling, and to provide recommendations to assist in early design decisions of interplanetary spacecraft. The radiation section of this report used NASA's OLTARIS program to generate data for analysis. The area of focus was on the radiation effects for crewed missions, therefore effective dose equivalent was the metric used to …
Tesseract, Edgar Uribe, Vanessa Faune
Tesseract, Edgar Uribe, Vanessa Faune
Mechanical Engineering
PolySat is a student-run, Cal Poly research program in which students develop small satellites, known as CubeSats, to be sent into space. Since the start of the program in 2000, PolySat has developed eight 10cm x 10cm x10cm CubeSats. Recently, the team has developed two satellites of double, and triple, that size for NASA-KSC & AI-Solutions and the National Science Foundation. The recent volumetric expansion has been driven by high demand for further satellite functionality, which necessitates large power generation capabilities. To remain competitive in the growing CubeSat industry, PolySat must develop a platform that can provide enough power to …
Modeling And Simulation Of Radiation From Electronic Transitions In Hypersonic Atmospheric Reentry Flow, Curtis Scholz
Modeling And Simulation Of Radiation From Electronic Transitions In Hypersonic Atmospheric Reentry Flow, Curtis Scholz
Doctoral Dissertations and Master's Theses
A capability for higher accuracy heat transfer modeling in CFD for hypersonic re-entry flows, via inclusion of thermal radiation, is sought. With temperatures reaching tens of thousands of degrees, radiation is known to be significant to chemical reaction rates and thermal boundary layer development, hence surface heat transfer and thermal ablation both to the heat shield and the backshell region of re-entry vehicles. Two current NASA solicitations seek such an improved capability relative to the Mars and Earth entry problems, as uncertainty typically leads to overdesign and excess weight. The present research develops a first physics-based “building block,” which computes …
Supersonic Retro-Propulsion Computational Fluid Dynamics Analysis Applied To Future Mars Mission, Margarita Nataly Brandt
Supersonic Retro-Propulsion Computational Fluid Dynamics Analysis Applied To Future Mars Mission, Margarita Nataly Brandt
Doctoral Dissertations and Master's Theses
Supersonic Retro-Propulsion is one of the most promising emerging technologies being considered by NASA for use in future Mars missions. This new form of Entry Descent Landing has the potential to help increase the allowable payload mass currently constraining many science instruments and operations. Computational Fluid Dynamics was used to show the feasibility of supersonic retro - propulsion in Mars atmospheric conditions. The results presented show the SRP will be able to perform satisfactory using the same conditions that the Curiosity Rover was exposed to during its landing sequence. The plume expansion was analyzed for various cases, moving from free …
Attitude Determination & Control System Design And Implementation For A 6u Cubesat Proximity Operations Mission, Francisco J. Franquiz
Attitude Determination & Control System Design And Implementation For A 6u Cubesat Proximity Operations Mission, Francisco J. Franquiz
Doctoral Dissertations and Master's Theses
The purpose of this work is to discuss the attitude determination and control system (ADCS) design process and implementation for a 12 kg, 6U (36.6 cm x 23.9 cm x 27.97 cm) CubeSat class nano-satellite. The design is based on the requirements and capabilities of the Application for Resident Space Object Proximity Analysis and IMAging (ARAPAIMA) proximity operations mission. The satellite is equipped with a cold gas propulsion system capable of exerting 2.5 mN m torques in both directions about each body axis. The attitude sensors include an angular rate gyro and star tracker (STR), supplemented by the payload optical …