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 15 of 15 for “"Attitude control systems"”.
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Optimal control co-design of attitude control systems
Attitude control is the process of orienting a spacecraft toward a desired point in space. Conventional systems for attitude control have been designed without considering the compliant response of the spacecraft. This leads to complex control algorithms that avoid exciting vibrational modes of the …
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Robust estimation and failure detection for reentry vehicle attitude control systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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NONLINEAR OBSERVER/CONTROLLER DESIGNS FOR SPACECRAFT ATTITUDE CONTROL SYSTEMS WITH UNCALIBRATED GYROS
… gyros, are vital sensors in spacecraft onboard attitude control systems. Gyro measurements are corrupted, though, due to errors in alignment and scale factor, biases, and noise. This work proposes a class of adaptive nonlinear observers for calibration of spacecraft gyros. Observers for each of …
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Design and utility assessment of attitude control systems for EVA task performance
… 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 pointing …
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A comparative study of various approaches to the design of on-off thruster attitude control systems
Thesis. (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Advancements in the Design and Development of CubeSat Attitude Determination and Control Testing at the Virginia Tech Space Systems Simulation Laboratory
… involved in the development of CubeSats lies the attitude determination and control of the satellite. The importance of a properly functioning attitude determination and control system (ADCS) on any satellite is vital to the satisfaction of its mission objectives. Due to this importance, …
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FILM EVAPORATION MEMS THRUSTER ARRAY FOR MICROPROPULSION
Current small sat propulsion systems require a substantial mass fraction of the vehicle involving tradeoffs between useful payload mass and maneuverability. This is also an issue with available attitude control systems which are either quickly saturated reaction wheels or movable high drag surfaces …
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Electromagnetic Steering of Sodium-Seeded Rocket Thrust Plumes: Design & Analysis
… is benefited by eliminating otherwise separate attitude control systems.
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Decentralized Coordinated Attitude Control of a Formation of Spacecraft
… 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 of a formation of spacecraft is investigated. The …
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Modeling and Parameter Estimation of Spacecraft Lateral Fuel Slosh
… of fuel slosh on spacecraft and launch vehicle attitude control systems has been a very important and challenging task and has been the subject of considerable research over the past years. Analytic determination of the slosh analog parameters has been met with mixed success and is made more …
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Optimized Thruster Allocation Utilizing Dual Quaternions for the Asteroid Sample Return Mission (OSIRIS-REx)
… require higher positional accuracy from the attitude control systems, new algorithm developments, along with sensor and actuator resolution and range improvements are necessary to achieve the desired science accuracies. For agile 6-Degrees of freedom (6-DOF) spacecraft with redundancy, the …
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Development of a verification and validation framework for autonomous soft-docking of spacecraft with uncertain dynamic properties
… vehicle for success, and often relied on manual control during the final stages. Autonomous docking, however, shows the potential to greatly reduce operation costs while accomplishing complex scenarios. Unfortunately, unknown dynamics and changing parameters stress current attitude control …
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Hybrid Induction Drive for a Magnetically Levitated Control Moment Gyroscope
… jitter and higher torque density multi-axis attitude control systems (ACS) will be needed [1]. This thesis aims to create a hybrid-drive reaction sphere with a spherical 1.5” diameter, diametrically magnetized grade N42 NdFeB rotor. A permanent magnet drive is used for vertical translation …
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Satellite Reorientation Using Reinforcement Learning Under Unknown Attitude Failure
… with deep-space satellites under unknown attitude determination and control system (ADCS) failures. When traditional fault-tolerant control methods cannot restore signal, the proposed RL controller acts as a last-resort measure by autonomously reorienting the satellite’s antenna toward …