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 “"State-trajectory"”.
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State-Trajectory Analysis and Control of LLC Resonant Converters
… the fast dynamic characteristic, a graphic state-plane technique has been adopted for a class of resonant converters. In this work, it has been extended to the LLC resonant converter. First of all, the LLC steady state and dynamic behaviors are analyzed in the state plane. After that, a …
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Optimization of LLC Resonant Converters: State-trajectory Control and PCB based Magnetics
… to implement a special LLC control method, state-trajectory control, with a low-cost microcontroller (MCU). And further efforts have been made to integrate all the state-trajectory control function into one MCU for high-frequency LLC converters, including start-up and short-circuit …
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Advanced Data Analysis Of In-Situ Bioremediation Site Data Using Dimensionality Reduction Techniques
… results in a single analysis. The new PCA “state-trajectory” method visualized temporal evolution in PCA space by connecting multiple well samples in two principal components. Three dimensionality reduction techniques were then compared using one TCE-contaminated site and included (1) the …
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Microcontroller (MCU) Based Simplified Optimal Trajectory Control (SOTC) for High-Frequency LLC Resonant Converters
… of the resonant tank. This paper employs state-trajectory analysis to describe and analyze the behavior of the resonant tank. Control methods based on state-trajectory analysis were used to solve the challenges in the control of the LLC resonant converter, including unpredictable dynamics, …
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Piecewise-constant control strategies for use in minimum fuel aeroassisted orbital transfers
… necessary to affect changes in the desired state dependent parameters while simplifying the optimization process. In the process of searching for a tool to produce numerical results, the current research investigates three candidate methods of solving the parameter optimization problem of …
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Adaptive State Feedback Control of Lorenz Systems to Its Non-Trivial Equilibrium
… In this chaotic regime, we implement a linear state feedback controller to stabilize the state trajectory at its original nontrivial equilibrium. The state variable for feedback is easily measurable. The system is proved to be globally asymptotically stable with a optimal feedback gain. The …
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Planning and control for simulated robotic Sandia hand for the DARPA Robotic Challenge
… as the grasp optimization system and the robot state trajectory computation system. However, for closed-loop control, a linear proportional-derivative (PD) joint position controller was used. The nonlinear algorithms used for the planning systems may be improved, but their current functionality …
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Adaptive power system control
… point and to control nonlinear functions of state variables. Feedback to the controller is obtained from phasor measurements at chosen power system buses, generator field voltage measurements, and state estimators. Control effort is aimed at minimizing the oscillations and influencing the …
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Simultaneous Design of Communication Strategies and Control Policies in Stochastic Systems
… control (decision) variable affects not only the state trajectory but also the quality of information that is available to the decision makers.
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Kernel-based approximate dynamic programming using Bellman residual elimination
… in solving Bellman's equation at a set of sample states. However, by exploiting kernel-based regression techniques (such as support vector regression and Gaussian process regression) with nondegenerate kernel functions as the underlying cost-to-go function approximation architecture, our …
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Decoupled Kinodynamic Planning for a Quadruped Robot over Complex Terrain
… constraints without committing to a full state trajectory which could be dynamically infeasible, as is a common failure of other sampling-based approaches. Then, we can solve an optimization problem to generate a dynamically feasible trajectory using these contact positions. Since contact …
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Influence of Architecture Design on the Performance and Fuel Efficiency of Hydraulic Hybrid Transmissions
… efficiency of on-road vehicles. To further the state-of-the-art this work investigates how architecture design influences the performance, fuel efficiency, and controllability of hydraulic hybrid transmissions. To that end a novel neural network based power management controller was proposed and …
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State Space Modeling and Power Flow Analysis of Modular Multilevel Converters
… operation of the MMC, this thesis proposes a state-space analysis technique in the present paper. Combining the power flow analysis with the state trajectory portrayed on a set of two-dimensional state plans, it clearly delineates the desired power transfer from the unwanted circulating …
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British Foreign Policy: An Examination of the Relationship between British Intelligence, Democratic Peace Theory, and International Law through the Lens of Ethnic Stratification & Mass Atrocity in Southeast Asia 1965-1990
Democratic peace theory suggests that democratic states do not engage in covert action against one another.1 Academic scholarship, however, indicates that democratic states will use covert action against an elected government if national security planners perceive there is democratic decay in its …
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Robust Control Methods for Nonlinear Systems with Uncertain Dynamics and Unknown Control Direction
… is indirectly stabilized via the desired state trajectory that is commanded to the other subsystem. The SIMO system under consideration does not contain uncertainty or disturbances. In dealing with systems containing uncertainty in the dynamic model, a particularly challenging situation …
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Modeling and Control Strategy for Capacitor Minimization of Modular Multilevel Converters
… and the means of reducing it, the method of state plane analysis is employed to offer visual support. In addition, the design trade-off between full bridge MMC and half bridge MMC is presented and a novel control strategy for a hybrid MMC is proposed. Finally, the work is supported with a …
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Improving the consistency of nonlinear estimators: analysis, algorithms, and applications
… Nonlinear estimation (i.e., estimating the state of a nonlinear system from noisy measurements) arises in all these applications. For instance, robot localization - which is considered as one of the fundamental problems in robotics - seeks to determine the robot's pose (position and …
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Invertibility and observability of switched systems with inputs and outputs
… by a dynamical subsystem having an internal state, an external input (which can be thought of as a disturbance or a control signal), and a measured output. Hybrid/switched systems may arise in practice because of the interaction of digital devices with physical components in order to …