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 24 for “"Attitude Control System"”.
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Verification of an attitude control system
Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Attitude control system for the high energy transient experiment small satellite
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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An aerocapture attitude control system incorporating robustness and vehicle parameter identification
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Reaction Wheel Attitude Control System With Minimum Electrical Energy Andfixed-Time Constraints
Made available in DSpace on 2014-12-09T18:12:22Z (GMT). No. of bitstreams: 1 6801710.pdf: 4792276 bytes, checksum: 1f25049dc383462a2c174d8f18d04853 (MD5) Previous issue date: 1967
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Evaluation of assembly simulators used in closed loop attitude control system testing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Design of an Attitude Control System for a Spacecraft with Propellant Slosh Dynamics
… of propellant slosh dynamics in a spacecraft system during a maneuver leads to attitude control system (ACS) performance degradation resulting in attitude tracking errors and instability. As spacecraft missions become more complex and involve longer durations, a substantial propellant mass is …
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The Distributed Spacecraft Attitude Control System Simulator: From Design Concept to Decentralized Control
… Depending upon con- figuration, air-bearing systems provide some combination of translational and rotational freedom; the three degrees of rotational freedom provided by a spherical air bearing are ideal for investigation of spacecraft attitude dynamics and control problems. An interest in …
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Simulation development and analysis of attitude-control system architectures for an astronaut mobility unit
Control-moment gyroscopes (CMGs) are spacecraft attitude-control actuators which control the spacecraft's orientation and pointing. CMGs operate on electrical power and therefore obey the the conservation of angular momentum. Single-gimbal CMGs are equipped with a high-speed flywheel which can be …
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Application of a model-based nonlinear attitude control for quadrotor UAVs
… have studied a quadrotor's operation. An attitude control system for a quadrotor is one of the most important parts in order to improve the quadrotor's performance. This thesis developed a quadrotor testbed and applied a model-based nonlinear attitude control, originally designed for a …
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Dynamic instabilities imparted by CubeSat deployable solar panels
… the effects of solar panel deployment on CubeSat attitude dynamics. Nominal and partial/asymmetric deployments were simulated for four different solar panel assemblies. Trend lines were obtained for the evolution of the angular velocities and accelerations of the CubeSat about its center of mass …
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Calibration of and Attitude Error Estimation for a Spaceborne Scatterometer using Measurements Over Land
… of an on-line spaceborne radar system. The technique is extended to estimate simultaneously NSCAT's calibration and the host spacecraft's attitude error. The attitude references reported by the attitude control system on-board ADEOS are deemed erroneous. Results of this expanded …
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Internal Torques and Forces in Gyrostats with Magnetically Suspended Rotors
… torque--free gyrostat and a gyrostat undergoing attitude maneuvers using momentum wheels and external torques. We then apply these internal forces to a model of an active magnetic bearing system and discuss their effects on the force limit, the actuator slew rate and the equivalent stiffness and …
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System Integration and Attitude Control of a Low-Cost Spacecraft Attitude Dynamics Simulator
The CalPoly Spacecraft Attitude Dynamics Simulator mimics the rotational dynamics of a spacecraft in orbit and acts as a testbed for spacecraft attitude control system development and demonstration. Prior to this thesis, the simulator platform and several subsystems had been designed and …
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ISM S-band CubeSat Radio Designed for the PolySat System Board
… CubeSat leads to the conclusion that this system will require a large deployable CubeSat antenna, large earth station satellite dish, and a fine-pointing attitude control system. Noise floor measurements of a CubeSat ground station demonstrate that terrestrial ISM interference can be …
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Constrained H̳₂ design via convex optimization with applications
A convex optimization controller design method is presented which minimizes the closed-loop H2 norm, subject to constraints on the magnitude of closed-loop transfer functions and transient responses due to specified inputs. This method uses direct parameter optimization of the closed-loop Youla or …
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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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bio-inspired attitude control of micro air vehicles using rich information from airflow sensors
… performance. Inspired by this phenomenon, an attitude control system for micro air vehicles using rich amount of airflow sensor information is proposed, designed and tested. The dissertation discusses our research findings on this topic. First, we quantified the errors between the calculated …
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On the dynamics of rigid multi-body systems in orbit
… the implementation of an appropriate spacecraft attitude control system. For multi-body space systems, the mechanical couplings have significant effects on the attitude dynamics. These effects, added to the high performance requirements and the number of strict constraints that, in general, space …
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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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The constrained discrete-time state-dependent Riccati equation technique for uncertain nonlinear systems
… is to introduce a relatively general nonlinear controller/estimator synthesis framework using a special type of the state-dependent Riccati equation technique. The continuous time state-dependent Riccati equation (SDRE) technique is extended to discrete-time under input and state constraints, …
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