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 “"Optimal Feedback Control"”.
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Neighboring Optimal Feedback Control for Trajectories Found by Collocation and Nonlinear Programming
… consumed about half of the satellite's attitude control and station keeping fuel supply. However the sequence of maneuvers which was used to put the satellite on-station was not determined optimally. In this work it is shown how much fuel might have been saved in this case if the satellite rescue …
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Optimal feedback control formulation of the active noise cancellation problem : pointwise and distributed
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Optimal feedback control for nonlinear discrete systems and applications to optimal control of nonlinear periodic ordinary differential equations
This dissertation presents a discussion of the optimal feedback control for nonliner systems (both discrete and ODE) and nonquadratic cost functions in order to achieve improved performance and larger regions of asymptotic stability in the nonlinear system context. The main work of this thesis is …
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Development of control and autonomy algorithms for docking to complex tumbling satellites
… tumbling. In order to safely maneuver about an uncontrolled satellite, an online trajectory planning algorithm with obstacle avoidance employed in a GN&C architecture is necessary. The main research contributions of this thesis is the development of an efficient sub-optimal path planning algorithm …
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Optimal control of a rotating cylinder partially filled with ideal fluid
Optimal control theory analysis is applied to a rotating cylinder partially filled with an inviscid, incompressible fluid. Two models of the system are investigated: (1) a two discrete mass system with fluid inside one mass and the control force applied to the other, and (2) a continuously …
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Near-Optimal Control of Atomic Force Microscope For Non-contact Mode Applications
… In this study, we outline a nonlinear near-optimal feedback control approach for non-contact mode imaging designed to move the cantilever tip laterally about a desired trajectory and maintain the tip vertically about the equilibrium point of the attraction and repulsion forces. We also …
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Optimal control of stochastic partial differential equations in Banach spaces
In this thesis we study optimal control problems in Banach spaces for stochastic partial differential equations. We investigate two different approaches. In the first part we study Hamilton-Jacobi-Bellman equations (HJB) in Banach spaces associated with optimal feedback control of a class of …
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Frequency selective analog to digital converter design : optimality, fundamental limitations, and performance bounds
… Digital Converters (ADCs) is studied within an optimal feedback control framework. A general ADC is modeled as a causal, discrete-time dynamical system with outputs taking values in a finite set. The performance measure is defined as the worst-case average intensity of the filtered …
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OPTIMAL CONTROL DESIGN FOR POLYNOMIAL NONLINEAR SYSTEMS USING SUM OF SQUARES TECHNIQUE WITH GUARANTEED LOCAL OPTIMALITY
Optimal control design and implementation for nonlinear systems is a topic of much interest. However, unlike for linear systems, for nonlinear systems explicit analytical solution for optimal feedback control is not available. Numerical techniques, on the other hand, can be used to approximate the …
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Fuel Efficient Control Design and Constrained Motion Analysis for Spacecraft Coulomb Formation in Elliptic Chief Orbits
… to the ratio of the masses. Two nonlinear optimal feedback control techniques are implemented to stabilize the dynamics of the Coulomb formation and maintain the desired formation while minimizing the energy costs. The control accelerations are compared to the analytical constraint …
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Numerical solution of optimal control problems with implicitly defined discontinuities with applications in engineering
In the thesis on hand we treat optimal control problems for implicitly discontinuous dynamical processes. We give a general model formulation which includes implicitly given state dependent discontinuities in the right hand sides of the DAE system. The formulation is adapted to real-world …
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Optimization of neural network feedback control systems using automatic differentiation
Optimal control problems can be challenging to solve, whether using analytic or numerical methods. This thesis examines the application of an adjoint method for optimal feedback control, which combines various algorithmic techniques into an original numerical method. In the method investigated …
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Investigating the Sophistication of Long-Latency Stretch Responses During Postural Control of the Upper Limb
A recent theory of motor control, based on optimal feedback control, posits that voluntary motor behaviour involves the sophisticated manipulation of sensory feedback. Although this theory can explain how people move in the world, it does not specifically describe how this control process is …
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Optimal anticipatory control as a theory of motor preparation
… the prevailing theory of neural motor control holds that movement generation is accomplished by a preparatory process that progressively steers the state of the motor cortex into a movement-specific optimal subspace prior to movement onset. The state of the cortex then evolves from …
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A planar comparison of actuators for vibration control of flexible structures
… the stringent pointing accuracy and vibration control requirements imposed on these systems, bring about interesting control problems. Addressing these problems has called for the use of active vibration control. Up to now, two of the most popular means for active vibration control of large …
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Robust Parameter Design for Automatically Controlled Systems and Nanostructure Synthesis
… methodology for dynamic systems with automatic control and for synthesis of nanostructures. In many automatically controlled dynamic processes, the optimal feedback control law depends on the parameter design solution and vice versa and therefore an integrated approach is necessary. A parameter …
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Contributions to the dynamics of helicopters with active rotor controls
… rotor helicopter with a Higher Harmonic Control (HHC) system for vibration reduction. The analysis includes the rigid body dynamics of the helicopter and blade flexibility. The gain matrix is assumed to be fixed and computed off-line. The discrete elements of the HHC control loop are …
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Optimal control of dynamical systems with time-invariant probabilistic parametric uncertainties
… taking model uncertainties into account during controller design is well established. Although this theory is well developed and quite mature, the worst-case uncertainty descriptions assumed in robust control formulations are incompatible with the uncertainty descriptions generated by commercial …
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Real-time brain-machine interface architectures : neural decoding from plan to movement
… or 'decoding' it into a motor command, and then controlling a device such as a computer interface or robotic arm. BMI research has largely focused on the problem of restoring the original motor function. The goal therefore has been to achieve a performance close to that of the healthy individual. …
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