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 96 for “"Disturbance Rejection"”.
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Disturbance Rejection and Control in Web Servers
… the response time as the main output. Several disturbances affect the system, such as the arrival rate of requests to the web site. A testbed was designed to allow repeatable experiments with different controller implementations. A server was instrumented with sensors and actuators to handle …
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Adaptive feedback technique for unmodeled disturbance rejection
… objective is to provide damping for transient disturbances via the fixed controller and rejection of steady disturbances via the adaptive controller. This technique differs from other control techniques in that it does not require a measurement of an external signal coherent with the …
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Harmonic and Narrowband Disturbance Rejection for Linear Time-Periodic Plants
… investigates the harmonic and narrowband disturbance rejection problem for linear time-periodic (LTP) systems. The consequence of disturbances on LTP systems is similar to their linear time-invariant (LTI) counterparts, but is complicated by the interaction of the disturbance and plant …
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Development of Robust Control Laws for Disturbance Rejection in Rotorcraft UAVs
… UAV systems into the national airspace. The rejection of unknown external wind disturbances offers a challenging task due to the limited available information about the unpredictable and turbulent characteristics of the wind. This thesis focuses on the design, development and implementation …
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A Disturbance-Rejection Problem for a 2-D Airfoil Exhibiting Flutter
… state-estimators. We also use simple models of disturbances to test attenuation and robustness of each control method. Finally, a method of quantitative robust analysis is reviewed and then applied to each of the controlled systems.
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Adaptive Control of an Aeroelastic System for Active Flutter Suppression and Disturbance Rejection
… delay the onset of flutter, and compensate for disturbances, actuator dynamics, and unmodeled nonlinear dynamics.</p> <p>This dissertation first develops a novel method for constructing time-domain simulation models of two and three-dimensional aeroelastic systems, resulting in models that are …
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Tracking Control and Disturbance Rejection With Applications to Non -Circular Turning for Camshaft Machining
The above theoretical developments are then applied to the Non-Circular Turning Process (NCTP) for camshaft machining. NCTP is a single-point turning process which produces non-circular shapes using rapid tool actuation. When applied to camshaft machining, NCTP enables the generation of a wide …
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Application of the Filtered-X LMS Algorithm for Disturbance Rejection in Time-Periodic Systems
Extensive disturbance rejection methods have been established for time-invariant systems. However, the development of these techniques has not focused on application to time-periodic systems in particular until recently. The filtered-X LMS algorithm is regarded as the best disturbance rejection …
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Digital Controller Implementation For Disturbance Rejection In The Optical Coupling Of A Mobile Experimental Laser Tracking Systems
… systems are more susceptible to environmental disturbances which affect the overall tracking resolution, and consequently, the resolution of any other experimental data being collected at any given time. This research characterizes the optical coupling between two systems in a Mobile …
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H<sub>∞</sub> and LQG optimal control for the rejection of persistent disturbances: analysis, design and experiment
… Augmented systems that are typically used in disturbance rejection problems are also analyzed. Additionally, a controlled output equation for disturbance rejection is developed based on the physics of the problem rather than the typical ad hoc approaches of the past. These controlled output …
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The internal performance of iterative feedback tuning
… is that the closed loop will have poor input disturbance rejection. A solution for ensuring that IFT does not have poor internal performance is to make sure that the disturbance rejection is adequate. However an adequate input disturbance may lead to other undesirable dynamics in the closed …
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Generalized Predictive Control Parameter Adaptation Using a Fuzzy Logic Approach
… Control parameters to improve broadband disturbance rejection was developed and tested. The effect of the parameters on disturbance rejection has previously been poorly understood and a trial and error method was used to achieve adequate results. This dissertation provides insight on the …
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Design and simulation of a state-variable control system for the positioning of a milling table using the internal model principle
… table must be capable of asymptotic tracking and disturbance rejection, and must be robust. The internal model principle is a general method developed by Davison, Desoer and Wonham which achieves asymptotic tracking and disturbance rejection, and is robust. In this thesis, a state-variable control …
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Adaptive modal damping for advanced LIGO suspensions
… LIGO directs much of its effort to the areas of disturbance rejection and noise suppression to measure these waves. The work in this thesis develops an adaptive modal damping control scheme for the suspended optics steering the laser beams in the LIGO interferometers. The controller must damp …
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Optimal rejection of nonstationary narrowband disturbances for flexible systems
… actuators often act as sources of narrowband disturbances and impede the optimal performance of these precision systems. The fundamental objective of this work is the development of an active control methodology capable of rejecting disturbances with narrowband nonstationary spectral …
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A low cost, DC-coupled active vibration isolation system
… with traditional air mounts for improved force disturbance rejection relative to passive optical tables.Force disturbance rejection and position alignment are two major functional requirements of vibration isolation systems. With conventional passive isolation systems, a tradeoff exists between …
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Fault Tolerant Deep Reinforcement Learning for Aerospace Applications
… system is designed with fault-tolerant and disturbance rejection capabilities and applied to a high-order nonlinear dynamic system. The approach uses a Reinforcement Learning architecture that combines concepts from optimal control, robust control, and game theory to create an optimally …
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Stable fraction approach and Computer-Aided Design of Control Systems
… stabilization and tracking; stabilization and disturbance rejection; stabilization, tracking and disturbance rejection problems; The problems of joint stabilization and tracking of a spinning satellite system in addition to its regulation are considered. Rational fractional approach in …
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Nonlinear robust control of functional electrical stimulation system for paraplegia
… considering to changes in mass of the subject, disturbance rejection and stability. Hence, the comprehensive control scheme is necessary for this application as well as a better model and trajectory. In modelling an additional joint has been considered to improve the accuracy. In trajectory …
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Adaptive Control of Systems Represented by Partial Differential Equations and Its Application to Networks of Multiagents
… means that agents can be heterogeneous. Disturbance rejection scheme is also presented for certain classes of disturbances.
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