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 34 for “"Large Space Structures"”.
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Real time identification of large space structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1987.
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Stability analysis of electromagnetically supported large space structures
… respectively incentivize the reduction of spacecraft mass and stowed volume, while the performance boosts that come from an increase in spacecraft dimensions incentivize the maximization of spacecraft deployed size. Also, specific missions might benefit from a particular capability that …
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Modeling passing damping mechanisms of large space structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Damage location and estimation in large space structures
… presents a unique method of damage detection in large space structures. The goal is to develop an efficient algorithm which can be automated in an on-line format, and can asses damage in many elements. Theses are goals not realized by current methods. Damage incurred in a structural member is …
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Linear theory of radiation from large space structures with induced AC current
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Evaluation of linear DC motor actuators for control of large space structures
… as a proof mass actuator for the control of large space structures. A model for the actuator, including the current and force compensation used, is derived. Because of the force compensation, the actuator is unstable when placed on a structure. Relative position feedback is used for actuator …
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Identification and control of lightly damped, large space structures: an experimental evaluation
… attempts to identify and control lightly damped, large space structures (LSS). The problems are low damping, high modal density, and low natural frequencies of oscillation. They present a blend of difficulties which lead the experimentalist to turn to multiple-input multiple-output (MIMO) …
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New feedback design methodologies for large space structures: a multi-criterion optimization approach
A few problems of designing structural control systems are addressed, considering optimization of three design objectives: state error energy, control energy and stability robustness. Tradeoff relationships among these selected design objectives are investigated by solving multiple objective …
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The Linear DC Motor as a proof mass actuator for vibration suppression in large space structures
… the forces necessary to damp vibrations in a large flexible structure. The design is broken down into three steps where in each step, a feedback loop is placed around the actuator and/or the structure. The first loop is a motor compensation loop which effectively decouples the motor model from …
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Micropolar Continuum Modeling of Large Space Structures with Flexible Joints and Thermal Effects: Theory and Experiment
… reduced order (homogenized) model for a large antenna space structure with flexible joints. An energy equivalence concept is employed to find the continuum model for the system. The kinetic and strain energy expressions of the fundamental elements are found based on the assumptions of the …
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Fusion of remote vision and on-board acceleration data for the vibration estimation of large space structures
Future space structures such as solar power stations and telescopes are expected to be very large. These structures will require on-orbit construction. Due to the risks and costs of human extravehicular work, teams of robots will be essential for the on-orbit assembly of the large space structures. …
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Optimal guidance and control of heterogeneous swarms for in-orbit self-assembly of large space structures: Algorithms and experiments
This Dissertation was approved for publication on 2019-07-12 at 14:10.
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Decentralized control of large space structures:an overview
… for the active control of vibrational damping in large space structures. A brief description of the finite element method is presented to explain the derivation of mathematical models of flexible structures represented by systems of linear second-order ordinary differential equations. The …
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Experimental-theoretical study of velocity feedback damping of structural vibrations
… control. Active damping will be required for large space structures which are performance-sensitive to motion or inaccurate pointing. Several control forms, including modal-space active damping and direct rate feedback, are analyzed theoretically, and three laboratory models are described. A …
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Manipulation of flexible structural modules by space robots during LSS construction
Future space structures are expected to have very large size. Such Large Space Structures (LSS) will be constructed in-orbit, probably by assembling large structural modules. This is a dangerous and difficult task for humans. On the other hand, this is a challenging and promising application for …
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The coordinated control of space robot teams for the on-orbit construction of large flexible space structures
Teams of autonomous space robots are needed for future space missions such as the construction of large solar power stations and large space telescopes in earth orbit. This work focuses on the control of teams of robots performing construction tasks such as manipulation and assembly of large space …
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A plane grillage model for structural dynamics experiments: design, theoretical analysis, and experimental testing
… active vibration control concepts applicable to large space structures, an experimental model is required that simulates the complicated dynamic characteristics of such structures. This study presents the design, theoretical analysis, and experimental testing of such a model - a large, flexible …
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Structural Scaling Metrics For Tensioned-Blanket Space Systems
… comparing the mass performance of aircraft and spacecraft platforms. Large space structures designers and evaluators rely on metrics to compare boom, telescope, and long antenna architectures. In this work, scaling metrics are established for rectangular flexible blanket solar array structural …
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Shape, motion, and inertial parameter estimation of space objects using teams of cooperative vision sensors
Future space missions are expected to use autonomous robotic systems to carry out a growing number of tasks. These tasks may include the assembly, inspection, and maintenance of large space structures; the capture and servicing of satellites; and the redirection of space debris that threatens …
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Incorporation of GNSS multipath to improve autonomous rendezvous, docking and proximity operations in space
… (AR&D;) operations are important for many future space missions, such as the resupply of space stations, repair and refueling of large satellites, and active removal of orbital debris. These operations depend critically on accurate, real-time knowledge of the relative position and velocity between …
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