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 283 for “"maneuvering"”.
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Maneuvering of a robotic pike
… and analyzed. A non-dimensional number, the Maneuvering Strouhal Number (Stm) is defined based on observations from live fish and previous theoretical developments. Recommendations for further improvements in the maneuvering performance of flexible hull vehicles are derived based on the …
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Optimal trajectories for maneuvering reentry vehicles
Many demanding aerospace missions today require maneuverable re-entry vehicles that can fly trajectories that have stringent path and terminal constraints, including those that cannot be written as drag or energy constraints. This work presents a method based on trajectory optimization techniques …
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Autonomous aerobatic maneuvering of miniature helicopters
In this thesis, I present an experimentally proven control methodology for the autonomous execution of aerobatic maneuvers with small-scale helicopters, and a low-order dynamic model which adequately describes a miniature helicopter in a wide range of flight conditions, including aerobatics. The …
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System identification applied to maneuvering trials.
Massachusetts Institute of Technology. Dept. of Ocean Engineering. Thesis. 1973. Ocean E.
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Passive estimation of underwater maneuvering targets
… this thesis examines the problem of tracking a maneuvering target in the 2-dimensional (X,Z) plane, vertical to the ocean floor, using passive time-delay measurements. The target is free to maneuver in velocity and make depth changes at times unknown to the observer. In the past, tracking …
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Applied fast maneuvering using a hybrid controller
Guidance and control of autonomous vehicles is a difficult and often calculation-intensive process. Current control approaches limit the functionality of autonomous vehicles. The approach applied in this thesis is to use a discrete-state model of the vehicle dynamics to build a hybrid automaton. By …
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Safe intention-aware maneuvering of autonomous vehicles
In order to improve driving performance, while achieving safety in a dynamic environment, it is crucial for a vehicle motion planner to be aware of the intentions of the surrounding agent vehicles. Many existing approaches that ignore the intentions of surrounding vehicles would produce risky or …
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Application of system identification to ship maneuvering
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1980.
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Improved convergence for optimization of evasive maneuvering
… optimal preprogrammed evasive maneuvers for a Maneuvering Reentry Vehicle (MaRV) attacking a target defended with Anti-Ballistic Missiles (ABMs). The problem is large in terms of the number of optimization parameters, and perhaps in terms of the number of nonlinear constraints. Since both MaRV …
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Nonlinear Observers for Aircraft Maneuvering in Wind
… achieve provably effective wind estimation for maneuvering aircraft. The framework is extended to uncertain aerodynamics and random turbulence by formulating the system as a stochastic differential equation. A nonlinear passivity-based wind observer is also introduced, serving as a full-order …
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Maneuvering Control of a Spacecraft with Propellant Sloshing
<p>Propellant slosh has been a problem studied in spacecraft designs since the early days of large, liquid-fuel rockets. The conventional design solution involves physical structures inside the fuel tanks that limit propellant motion. Although effective, baffles and bladders add to spacecraft mass …
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Optimizing Parameters and Controls for Maneuvering Flexible Structures
… both the parameters and the control for maneuvering flexible structures is addressed. The necessary conditions for the general problem are defined and a numerical technique for the solution is discussed. Implementing the numerical solution is shown to be practical using reduced-order …
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Real-time maneuvering decisions for autonomous air combat
… approximation dynamic program to provide maneuvering decisions for autonomous one-on-one air combat. Value iteration techniques are used to compute a function approximation representing the solution to the dynamic program. The function approximation is then used as a maneuvering policy for …
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Tracking maneuvering targets via semi-Markov maneuver modeling
… Gaussian disturbance and error processes. The maneuvering target tracking problem generally involves nonlinear system properties as well as non-Gaussian disturbance processes. The study presented here explores several solutions. to this problem. An adaptive state estimator centered about the …
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Aerodynamics of maneuvering slender wings with leading-edge separation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Boost through reentry trajectory planning for maneuvering reentry vehicles
New trajectory planning concepts are explored for rapidly planning a long range, boost-through- reentry mission, using a lightweight, highly maneuverable reentry vehicle. An Aimpoint Map, a set of all possible piercepoints through which a boost-through-reentry trajectory can be flown to a fixed …
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Computational Analysis of Straight and Maneuvering Bat Flight Aerodynamics
Bats have many impressive flight characteristics such as the ability to rapidly change direction, carry substantial loads, and maintain good flight efficiency. For several years, researchers have been working towards an understanding of the specific aerodynamic phenomena which relate the unique …
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Optimal control theory applied to ship maneuvering in restricted waters
… to apply modern optimal control theory to these maneuvering scenarios in order to show that helmsman may some day be replaced by modern controllers. The maneuvering equations of motion are cast in a linear state space framework, permitting the design of a linear quadratic (LQ) controller. In …
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Stability and maneuvering of hybrid hydrofoil/SWATH in foilborne mode
… is previously unassessed for stability and maneuvering characteristics. A six degree of freedom model of the foilborne vehicle dynamics is introduced as a framework to study vehicle stability and maneuvering. Linearized models of the vehicle dynamics are compared to the six degree of freedom …
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