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 “"Linear Quadratic Gaussian"”.
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Simulation Development, Path Planning, and Linear Quadratic Gaussian Precision Landing for Unmanned Traffic Management Operations
… applications, utilizing AprilTags with a Linear Quadratic Gaussian (LQG) law. Tests were conducted with the High Fidelity framework developed. Results indicate that the guidance and control law is robust from gust disturbances injected in the simulation realm.
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Analytical and Experimental Study of Nonlinear Structural Control Using Neural Networks
Finally, a linear quadratic Gaussian optimal regulator ( LQG) is designed from an experimentally identified model. Then, the optimal controller is assessed and compared to the neurocontroller results. Additionally, the stability and robustness of the controller is illustrated and outlined. It is …
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Centralized and Decentralized Control With Limited Information
… accuracy given fixed average throughput, under a linear quadratic Gaussian (LQG) setup. We demonstrate that more frequent communication is beneficial given a fixed amount of information.
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Optimal adaptive control with ΘLQG
… introduces ΘLQG, the hyper extension of the Linear Quadratic Gaussian Regulator, for solving general purpose (locally optimal) nonlinear adaptive control on multiple-input multiple-output systems. This approach can be used to stabilize an under-actuated under-observed nonlinear dynamic system …
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Rational inattention in control of Markov chains
… in this paper reduces to a variant of the linear-programming representation of the average-cost optimal control problem, subject to an additional mutual information constraint on the randomized stationary policy. The resulting in nite-dimensional convex program admits a decomposition based …
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Identification and control of lightly damped, large space structures: an experimental evaluation
… as two types of compensator-based controllers: Linear Quadratic Gaussian, and Independent Modal Space Control. The various techniques are described in the context of controlling lightly damped LSS. Because the research in this dissertation is primarily applications oriented, problems which …
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Enabling reliable control with communication constraints
… to sustain a given control performance in a Linear-Quadratic-Gaussian (LQG) control system. We then demonstrate that these bounds are nearly achievable using a time-invariant data compression architecture. We use the proposed architecture to develop algorithms for minimum rate LQG control …
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Application of multivariable and intelligent control strategies for improving plasma characteristics in reactive ion etching
… as Proportional-Integral ( PI ) self-tuning, Linear Quadratic Gaussian ( LQG ), stochastic adaptive control, Deurocontrol, robust and hierarchical control based on both linear and nonlinear models of the Plasma Generation Subsystem (PGS) are developed to improve plasma characteristics in the …
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DESIGNING A CONTROL SYSTEM FOR THE AUTONOMOUS SMALL SCALE HELICOPTER
… PID (Proportional Integral and Derivative), LQG (Linear Quadratic Gaussian) and IMC (Internal Model Controller) are compared while tuning the system to achieve highstability. The stability of the system is measured by its step response. Finally the system is simulated and its functionality is …
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Design of active trailer steering systems for long combination vehicles using robust control techniques
… far, the design of ATS systems have utilised the Linear Quadratic Regulator (LQR) control technique. Although the LQR technique provides satisfactory results, it fails to control the system in presence of external disturbances such as sensor noise, parametric uncertainties, and un-modelled …
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Combining local and global optimization for planning and control in information space
… and exploitation. Moreover, we use the iterative linear quadratic Gaussian algorithm (iLQG) to find a locally-feedback control policy in continuous state and control spaces to traverse the sub-optimal trajectory. We show that, under some suitable technical assumptions, the error bound of a …
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Gain scheduling for geometrically nonlinear flexible space structures
… approach for the control of geometrically nonlinear structures is developed. The objective is to improve performance over current linear design techniques that are applied to the same control problem. The approach is applicable to a variety of structures that have complex dynamics with slow …
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Online Learning in Control Theory
… involving unknown parameters, with focus on Linear-Quadratic-Gaussian systems. In the first problem, the control system is known and linear, and a sequence of quadratic cost functions is revealed to the controller in hindsight. The controller aims to achieve a sublinear regret, similar to the …
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Active vibration control of civil engineering structures
… when the structure enters the inelastic region. Linear Quadratic Gaussian and H-infinity active control schemes are designed, simulated and assessed for buildings, modelled as lumped parameter systems, including base and actuator dynamics. Various aspects of the designs are extensively evaluated …
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State-space LQG self-tuning control of flexible structures
… design method developed based upon a state-space linear quadratic Gaussian (LQG) control strategy for rejecting a disturbance in a flexible structure in the face of model uncertainty. The parameters to be tuned are treated as additional state variables and are estimated recursively together with …
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Position and vibration control of flexible space robots
… is adopted to separate the equations into nonlinear rigid-body equations and linear perturbation equations. The nominal trajectory is planned to conserve the limited actuator resources and keep the platform attitude stationary, by eliminating the inherent kinematic redundancy of the …
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Feedback Control of Multi-Story Structures under Seismic Excitations
… different types of control methodologies, the Linear Quadratic Gaussian (LQG) control, the Disturbance Accommodating Control (DAC), and the hybrid LQG/DAC approaches, were successfully developed to actively mitigate the vibration of the multi-story structures subjected to the seismic …
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Studies in system representation and control
… is more difficult to solve than the regular Linear Quadratic Gaussian problem. We present a solution that involves solving two Riccati equations and a stable projection.
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Belief shaping in noncooperative communication and control systems through strategic signaling
… strategy. Due to the versatility of the Gaussian distribution, we first formulate derivation of the optimal signaling strategies for Gauss Markov information in dynamic communication settings. We formulate an equivalent semi-definite program instead of addressing this problem over the …
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Decentralized control of sound radiation from periodically stiffened panels
… strategy, which combines frequency-shaped linear quadratic Gaussian (LQG) control with loop transfer recovery (LTR), is capable of achieving 12dB peak reductions and a 3.6dB integrated reduction in radiated sound power from a rib-stiffened aluminum panel.
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