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 15 of 15 for “"Stochastic Disturbances"”.
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Event-Based Control and Estimation with Stochastic Disturbances
… is that they communicate new information about stochastic process disturbances. A data network in the control loop imposes constraints on the event timing, modelled as a minimum time between packets. A thresholdbased control strategy is suggested and shown to be optimal for firstorder systems …
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Fast Adaptive Laws for Adaptive Control Under Stochastic Disturbances
… with all states accessible perturbed by a stochastic disturbance. First, we consider high-order tuner algorithms based on accelerated gradient methods for the optimization of convex loss functions, and derive a new adaptive law designed for stable adaptive control. Second, we review the …
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Influence of Resource Pulses Following Stochastic Disturbances on Aquatic Food Webs
… to winter hypoxia, periodically resulting in stochastic mass mortality events. These natural disturbances may result in an important resource pulse through carcass decomposition, providing increased nutrient availability and primary productivity, enhancing eutrophication processes, and …
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Kalman filtering in noisy nonlinear systems using a jump matrix approach
… for example saturating gain blocks, and stochastic disturbances-- an example extremely difficult to handle with EKF techniques.
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Optimal control theory applied to ship maneuvering in restricted waters
… stable control in the presence of additional. stochastic disturbances.
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A forward model-based analysis of cardiovascular system identification methods
… perturbations include respiratory activity and stochastic disturbances to total peripheral resistance (TPR) and heart rate representing, for example, autoregulation of local vascular beds and higher brain center activity. We demonstrated that this model emulates experimental data in terms of …
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PLAYBACK BUFFERING AND CONTROL FOR LINEAR MULTIPLE INPUT MULTIPLE OUTPUT NETWORK CONTROL SYSTEMS
… noise rejection property of our strategy under stochastic disturbances using our performance index.
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Attitude control of an underwater vehicle subjected to waves
… method for estimating the spectra of water wave disturbances on five of the six axes of a stationary, slender body underwater vehicle in an inertia dominated wave force regime, both in head seas and in beam seas. Inertia dominated wave forces are typical of those encountered by a 21 inch …
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Adaptive modal damping for advanced LIGO suspensions
… filtering for all time as the non-stationary stochastic disturbances evolve. The adaptation is tuned to provide optimal sensitivity to astrophysical sources of gravitational waves. The degree of sensitivity improvement is analyzed for several classes of these sources.
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Transition dynamics between the multiple steady states in natural ventilation systems : from theories to applications in optimal controls
… state to another under sufficient perturbations (disturbances) when multiple steady states exist. A successful transition is determined by both the magnitudes and durations of the perturbations. The transition dynamics are found to be important in theoretical, computational, and control …
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Closed-loop market dynamics for a deregulated electric power industry
… A simulation of the market, driven by stochastic disturbances, shows how entirely profit-based generators adapt themselves to optimize overall social welfare. The second contribution from this thesis is the development of a new concept for market-based frequency controls. By requiring …
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Stochastic Event-Based Control and Estimation
… investigates an event-based variation on the stochastic linear-quadratic (LQ) control problem, with a fixed cost per control event. The sporadic constraint of an enforced minimum inter-event time is introduced, yielding a mixed continuous-/discrete-time formulation. The quantitative trade-off …
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Feedback Control of Multi-Story Structures under Seismic Excitations
… excitations are represented by arbitrary unknown stochastic disturbances. The research consists of modeling of the structure with a control system and a control design in the state space. A combination of the extended Hamilton's principle and the Hierarchical Finite Element Method (HFEM) was used …
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Orbital Maneuvers and Interplanetary Trajectory Design via Reinforcement Learning
… deterministic conditions, their sensitivity to stochastic disturbances and computational limitations in highly nonlinear or uncertain environments pose significant challenges for future autonomous space missions.</p> <p>To address these challenges, this research proposes a reinforcement learning …
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Parameter Estimation Techniques for Nonlinear Dynamic Models with Limited Data, Process Disturbances and Modeling Errors
… second problem involves estimating unmeasured disturbances, assuming that enough data are available for parameter estimation. In the first part of this thesis, a model is developed to predict rates of undesirable reactions during the finishing stage of nylon 66 production. This model has too …