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 506 for “"maneuvers"”.
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Parametrized maneuvers for autonomous vehicles
… framework illustrates the use of parametrized maneuvers for solving vehicle guidance problems. The earlier relaxation of strict optimality conditions makes possible the imposition of affine state transformation constraints, allowing maneuver sets to fit easily into a mixed integer-linear …
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Optimal rigid-body rotational maneuvers
Optimal rigid-body angular maneuvers are investigated, using restricted control moments—a problem inspired in the context of rotational maneuvers for <i>super-maneuverable</i> aircraft. Most of the analysis is based on the formulation with no direct control over the roll component of angular …
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Control primitives for fast helicopter maneuvers
… we introduce a framework for learning aggressive maneuvers using dynamic movement primitives (DMP) for helicopters. Our ultimate goal is to combine these DMPs to generate new primitives and demonstrate them on a 3-DOF (3 Degrees of Freedom) helicopter. An observed movement is approximated and …
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Safety verification for automated vehicle maneuvers
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Optimal large angle spacecraft rotational maneuvers
… with optimal large angle spacecraft rotational maneuvers. Both rigid and flexible body dynamical models for these vehicles are considered. Three relaxation/analytic continuation methods are developed for iteratively solving the two-point-boundary value problem which results in the treatment of …
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Large-angle slewing maneuvers for flexible spacecraft
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1986.
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Aggressive landing maneuvers for unmanned aerial vehicles
VTOL (Vertical Take Off and Landing) vehicle landing is considered to be a critically difficult task for both land, marine, and urban operations. This thesis describes one possible control approach to enable landing of unmanned aircraft systems at all attitudes, including against walls and ceilings …
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Quantifying aircraft agility using minimum-time maneuvers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Time-optimal reorientation maneuvers of an aircraft
… mathematical model for the reorientation maneuvers of interest was developed, to ensure practical value of the analysis. In particular, an effective method for smooth fitting of the aerodynamic data was devised. The Minimum Principle from optimal control theory was applied and the optimal …
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BILEVEL OPTIMIZATION FOR FAST CONTROL MOMENT GYRO MANEUVERS
Agility is at the forefront of considerations on control moment gyro-equipped spacecraft. Common approaches to allocating control moment gyro gimbal rates for commanded body torques often sacrifice torque authority for straightforward, analytical methods that can be readily implemented in flight …
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Flight Regime and Maneuver Recognition for Complex Maneuvers
… of flight regime recognition during complex maneuvers flown in a fixed wing airplane using measured data from an Inertial Measurement Unit (IMU). Flight Regime Recognition (FRR) is required for numerous applications in the aerospace and aviation industry, including the determination of loads …
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Minimization of Roll Firings for Optimal Propellant Maneuvers
Attitude control of the International Space Station (ISS) is critical for operations, impacting power, communications, and thermal systems. The station uses gyroscopes and thrusters for attitude control, and reorientations are normally assisted by thrusters on docked vehicles. When the docked …
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Passive dynamics in the control of gymnastic maneuvers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Classical Element Feedback Control for Spacecraft Orbital Maneuvers
… orbit control laws for use in spacecraft orbital maneuvers, and spacecraft formation flying. We apply these new control laws to a number of sample maneuvers, including formation stablishment and formation keeping maneuvers for NASA-Goddard's Leonardo-BRDF formation, and coupled orbit, and attitude …
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Optimal nonlinear feedback control of spacecraft attitude maneuvers
… for large angle, nonlinear spacecraft attitude maneuvers. Scalar and two-state systems are presented as simple examples to demonstrate the method, and several systems of state variables to parameterize spacecraft motion are considered. Both external and internal control torques are treated; in …
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Optimal Electrodynamic Tether Phasing and Orbit-Raising Maneuvers
… (EDT) performing phasing and orbit-raising maneuvers. An EDT is a conductive tether on the order of 20 km in length and uses a Lorentz force to provide propellantless thrust. We develop the optimal equations of motion using Pontryagin's Minimum Principle. We find numerical solutions using a …
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Orbital Maneuvers and Interplanetary Trajectory Design via Reinforcement Learning
… set of trajectory design problems: orbit-raising maneuvers, inclination change maneuvers, combined orbital maneuvers, and an asteroid rendezvous mission targeting near-Earth asteroid Apophis.</p> <p>The RL agents are trained under both deterministic and stochastic conditions, with stochastic …
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INCREASE IN 1RM BACK SQUAT AFTER ABDOMINAL STABILIZING MANEUVERS
… and abdominal hollowing (AH) are two stabilizing maneuvers that increase IAP. Previous literature primarily compared AH and AB in therapy settings on bodyweight single joint movements. The effect of AB and AH during a multi-joint movement involving a maximum or near maximum external load is …
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Interceptor guidance using angle-only measurements and discrete maneuvers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Advanced Linear Model Predictive Control For Helicopter Shipboard Maneuvers
This dissertation focuses on implementing and analyzing advanced methods of model predictive control to control helicopters into stable flight near a ship and perform a soft touchdown from that state. A shrinking horizon model predictive control method is presented which can target specific states …
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