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 18 of 18 for “"LQG Control"”.
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Enabling reliable control with communication constraints
… safety, the communication networks that control these autonomous systems will face strict latency and reliability requirements. Wireless resources are fundamentally scarce, and this scarcity is further compounded by the need for high reliability and low latency. This motivates research …
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Rational inattention in control of Markov chains
This thesis poses a general model for optimal control subject to information constraint, motivated in part by recent work on information-constrained decision-making by economic agents. In the average-cost optimal control framework, the general model introduced in this paper reduces to a variant of …
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System modeling and control design of a two-stage metering poppet-valve system
… mathematical models, stability criteria, and control designs for a two-stage poppet valve system with a simple back-side pipeline condition that may be used in a valve stack to create an independent metering function for a hydraulic circuit. First, this system is modeled as a nonlinear …
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Design of active trailer steering systems for long combination vehicles using robust control techniques
… 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 dynamics. This encourages the need of a …
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Theoretical Principles for Information-Efficient Reasoning under Uncertainty
… gap, we propose a novel approach to stochastic control that enables the regulation of inference—an internal process through which agents transform noisy observations into beliefs that guide their behavior. We apply our framework to quantitatively examine how meta-cognitive agents solve …
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Optimal placement of sensor and actuator for sound-structure interaction system
… cavity is used to construct a robust feedback controller based on minimax LQG control design method. The controller is aimed to reduce acoustic potential energy in the cavity. This energy is due to the structure-borne sound inside the sound-structure interaction system. Practical aspects of the …
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State-space LQG self-tuning control of flexible structures
… 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 the system state that is …
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Position and vibration control of flexible space robots
… is concerned with the position and vibration control of flexible articulated space robots consisting of a rigid platform, two flexible arms, and a rigid end-effector carrying a payload, all components being serially connected through revolute joints. The mission is to carry a payload over a …
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Feedback Control of Multi-Story Structures under Seismic Excitations
This dissertation studies the feedback control of the dynamic response of multi-story structures to seismic excitations. The seismic excitations are represented by arbitrary unknown stochastic disturbances. The research consists of modeling of the structure with a control system and a control …
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Decentralized control of sound radiation from periodically stiffened panels
Active structural acoustic control has previously been used to reduce low-frequency sound radiation from relatively simple laboratory structures. However, significant implementation issues have to be addressed before active control can be used on large, complex structures such as an aircraft …
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Multi-axial Active Isolation for Seismic Protection of Buildings
Structural control technology has been widely accepted as an effective means for the protection of structures against seismic hazards. Passive base isolation is one of the common structural control techniques used to enhance the performance of structures subjected to severe earthquake excitations. …
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Performance index analysis of control systems synthesized for a counter-current process
… predict the ability of a particular MIMO control system design to meet certain performance objectives are discussed in this dissertation. These performance objectives include: * Input and output rejection of noise and disturbances. * Input and output insensitivity to changes in the …
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An analytical investigation of passive and active suspension systems for articulated freight vehicles
… covariance analysis. Linear Quadratic Gaussian (LQG) control technique is employed to design an ideal fail-safe active suspension scheme based on full-state feedback. Passive damping and stiffness elements are incorporated in the active suspension system to yield a fail-safe configuration with …
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Learning-based optimal and robust control: A policy optimization perspective
… also make PO a promising approach for addressing control theory problems, where traditional methods often rely on well-defined models that may not be available. Despite its broad applicability, PO-based control synthesis is inherently nonconvex, posing significant challenges for achieving strong …
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Dynamics and Control of Flexible Aircraft
… dynamics, structural dynamics, aerodynamics and controls. The unified formulation is based on fundamental principles and incorporates in a natural manner both rigid body motions of the aircraft as a whole and elastic deformations of the flexible components (fuselage, wing and empennage), as well …
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Control Structures for Low-Emission Combustion in Multi-Cylinder Engines
… predictable and inherently more difficult to control. This thesis summarizes work on control structures for three different setups of such low-emissions combustion engines. In a port-fuel injection engine, it was shown that combining two control variables in a mid-ranging control structure can …
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Data-Rich Multivariable Control of Heavy-Duty Engines
… become more complex, the task of calibration and control becomes more challenging. This thesis investigates approaches to utilize rich sensor information for multivariable engine control. Different combustion modes, and different combinations of sensors and actuators have been studied and …