Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Spacecraft Systems"”.
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Design optimization of thermal paths in spacecraft systems
… Thermal design optimization has lagged other subsystems because the thermal subsystem is not thought to significantly drive performance or resource consumption. However, there are factors present in many spacecraft systems that invalidate this assumption. Traditional thermal design methods …
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Reconfigurable thruster selection algorithms for aggregative spacecraft systems
The vast majority of today's space systems launch to orbit as completely assembled spacecraft stowed within a single launch vehicle. However, there is demand for large space systems (e.g., large space telescopes, fuel depots, space habitats, and solar power stations) that are overly limited by the …
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Health Management and Adaptive Control of Distributed Spacecraft Systems
… and collaborative inspection that involve multi-spacecraft systems increases, the requirements needed to improve post-failure safety to maintain the mission performance also increases, especially when operating under uncertain conditions. In particular, space missions that involve Distributed …
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Spacecraft Systems Design for LuNaDrone: A Deployable Lunar Hopper
L'abstract è presente nell'allegato / the abstract is in the attachment
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Modeling the effect of trend information on human failure detection and diagnosis in spacecraft systems
Systems are performing increasingly complicated tasks, made possible by significant advances in hardware and software technology. This task complexity is reflected in the system design, with a corresponding increased demand on comprehensive design efforts. Fundamental to the safety and mission …
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Development of a Research Spacecraft Test-Bed with Implementation of Control Laws to Compensate Undesired Dynamics
<p>The development of research spacecraft systems has a significant impact on the preparation and simulation of future space missions. Hardware, software and operation procedures can be adequately tested, validated and verified before they are deployed for the actual mission. In this thesis, a …
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Spacecraft formation flight exploiting potential fields
… system have led to the proposal of several multi-spacecraft missions by both NASA and DoD. One such benefit is the reconfigurability of these multi-spacecraft systems. This ultimately led to additional requirements being levied onto these missions, such as the general astrophysical imaging …
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Decentralized Coordinated Attitude Control of a Formation of Spacecraft
Spacecraft formations offer more powerful and robust space system architectures than single spacecraft systems. Investigations into the dynamics and control of spacecraft formations are vital for the development and design of future successful space missions. The problem of controlling the attitude …
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Micrometeoroid Fluence Variation in Critical Orbits Due to Asteroid Disruption
… rocket bodies, paint flakes, and the effluent of spacecraft collisions. Even small MMOD particles on the order of 1 cm in diameter have the potential to destroy critical spacecraft systems. Because of this, MMOD is a threat to all spacecraft in orbit. Even governments that most sternly oppose US …
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Deep-Learning Based Multiple-Model Bayesian Architecture for Spacecraft Fault Estimation
… of an intelligent architecture designed for spacecraft fault estimation. The approach incorporates a collection of systematically organized autoencoders within a Bayesian framework, enabling early detection and classification of various spacecraft faults such as reaction-wheel damage, sensor …
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Design and utility assessment of attitude control systems for EVA task performance
… servicing and assembly missions could benet from spacecraft systems capable of maintaining pointing stability during critical operations. The addition of single-gimbal control moment gyroscopes (CMGs) to the attitude control system of these spacecraft could substantially improve the stability and …
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Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking
… and environment friendliness. Solar powered spacecraft systems have ever-expanding loads with stringent power regulation specifications. Moreover, they require a light and compact design of their power system. These constraints make the optimization of power harvest from solar arrays a …
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Fault detection algorithms for spacecraft monitoring and environmental sensing
… there is a growing need for efficient spacecraft systems monitoring and space situational awareness to avoid service interruptions due to hazards such as space weather. Particularly for large constellations, satellites need greater autonomy to improve responsivity and reduce the load on …
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Continuous Low-Thrust Trajectory Optimization: Techniques and Applications
… and are numerically well-behaved. Low-thrust systems, on the other hand, operate for significant periods of the mission time. As a result, the solution approach requires continuous optimization; the associated optimal control problems are in general numerically ill-conditioned. In addition, …
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Design and integration of a three degrees-of freedom robotic vehicle with control moment gyro for the Autonomous Multiagent Physically Interacting Spacecraft (AMPHIS) testbed
The use of fractionated spacecraft systems in on-orbit spacecraft assembly has the potential to provide benefits to both the defense and civil space community. To this end, much research must be conducted to develop and prove the requisite technologies to achieve these benefits. This thesis …
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High-temperature superconductors as electromagnetic deployment and support structures in spacecraft
… and increasing the stowed-to-deployed ratio of spacecraft systems. This technique uses the magnetic fields generated by high-temperature superconductors (HTSs) to support spacecraft structures and deploy them to operational configurations from stowed positions inside a launch vehicle fairing. …
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Exploration of Planetary Bodies with Electrospray Thrusters
… current paradigm of using a single, monolithic, spacecraft limits the number of asteroid visits to one every few years. By using fleets of standardized small spacecraft, the frequency of asteroid visits could be dramatically increased while simultaneously decreasing the cost per visit. With the …
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Assessment and Analysis of Commercial Off the Shelf Devices for Space Applications
… environment in space exposes electronic systems to intense cosmic rays and solar radiation, which poses significant risks of damage and failure. Ensuring the reliability and efficiency of these systems is therefore a crucial priority. This paper evaluates and tests the performance of …
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Development of a model-based systems engineering architecture for an unmanned cargo spacecraft design
Unmanned Cargo Spacecraft (UCS) systems involve exceedingly complex systems engineering and design in order to implement. UCS typically include a vast range of subsystems – Command and Data Handling (C&DH), Attitude Determination and Control System (ADCS), Propulsion, Guidance, Navigation, and …
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Robust Spacecraft Autonomy for Deep Space Exploration in Special Euclidean Group SE(3)
… have not truly left Earth since the Apollo, as spacecraft in some LEOs remain subject to atmospheric drag thus emphasizing their continued connection to Earth's immediate environment. Reflecting on this, it becomes clear that humanity has largely remained bound to Earth’s immediate vicinity …
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