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 27 for “"Closed-loop stability"”.
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Approximate Explicit MPC and Closed-loop Stability: Analysis based on PWA Lyapunov Functions
… implementable, e.g., in FPGA. To ensure that closed-loop stability properties are guaranteed, a stability analysis tool is proposed which exploits suitable and possibly discontinuous PWA Lyapunov-like functions. The tool requires solving offline a linear programming problem. Moreover, the tool …
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Reliable control of decentralized systems: An ARE-based H(infinity) approach
… (ARE). The basic decentralized design guarantees closed-loop stability and a predetermined level of worst-case disturbance attenuation. Certain modifications of the basic design guarantee the stability and disturbance attenuation to be robust despite plant uncertainty or reliable despite …
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Robust Modular Control over Graph-Structured Feedback Architectures
… in which a human or mobile agent operates in the loop. In particular, we introduce a modular feedback synthesis based on linear matrix inequalities (LMIs) that guarantees closed-loop stability for all admissible feedback gains by sharing a common Lyapunov function. From a coalitional control …
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Optimal control of dynamical systems with time-invariant probabilistic parametric uncertainties
… on output are transformed such that the eventual closed-loop performance is insensitive to parametric uncertainties. A robustifying constant is used to enforce the closed-loop stability of the original system of equations. This approach results in the first PC-based feedback control algorithm with …
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Vision-Based Control and Flight Optimization of a Rotorcraft UAV
… estimation algorithm directly affect the closed-loop stability of the system, proportional with altitude. By identifying the frequency response of each input and adding filters to delay some of the inputs, the closed-loop system maintains stable flight above 18 m above ground, where the …
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Development and experimental validation of direct controller tuning for spaceborne telescopes
… which combines the high performance and stability robustness guarantees of modem, robust-control design with the spaceflight heritage of conventional control design, is proposed which will meet the strict requirements and maintain traceability to the successful controllers from …
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A General Framework for the Control of Nonlinear Systems
… of a nonconservative framework for analyzing the closed loop stability and performance of generic nonlinear dynamical systems. Such a framework can be developed for systems consisting of interconnections of linear systems and bounded nonlinear operators. The use of the Standard Nonlinear Operator …
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Zero voltage switching flyback and forward converter topologies
… mode control. The small signal analysis and closed loop stability of the proposed topologies are also derived. The resulting compensation required for stable operation is obtained and shown to be straightforward. The steady state and small signal analyses are verified on a 50W prototype …
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Predictive control algorithms with guaranteed stability and asymptotic tracking
… process is developed and validated using open loop identification. Modifications are made to the identification algorithm to enhance accuracy of the estimated model. The GPC (generalized predictive control) algorithm is then implemented for mold level regulation of the casting process. …
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Hierarchical control for multi-domain coordination of vehicle energy systems with switched dynamics
… is evaluated in application to a hardware-in-the-loop electro-thermal testbed representative of a scaled aircraft energy system, where it achieves significantly improved capability, efficiency, and safety as compared to legacy control approaches. Next, the structural information embedded in the …
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Active Suppression ofAerofoil Flutter via Neural-Network-Based Adaptive Nonlinear Optimal Control
… overall system, an additional stabilising tuning loop for the actor NN, or an additional stabilising term in the critic NN tuning law, to guarantee the closed-loop stability for unstable and marginally stable systems. The resulting complexity is undesired in AFS applications due to computational …
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Development of Fault Tolerant Adaptive Control Laws for Aerospace Systems
… several phases, ranging from theoretical stability analysis, simulation and hardware implementation on different types of aerospace systems including spacecraft, aircraft and quadrotor vehicles.</p> <p>The results presented in this dissertation are focused on two main adaptivity …
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Hierarchical power management in vehicle systems
… with a general nonlinear form of power flow, closed-loop stability is established through local subsystem analysis based on passivity. The ability to assess system-wide stability from local subsystem analysis follows from the particular structure of the interconnections between each subsystem, …
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Cloud-Based Model Predictive Control: Establishing a Fully Distributed Architecture for Nonlinear MPC
… of complex, interconnected processes. Achieving closed-loop stability and centralized performance in nonlinear, distributed or decentralized systems remains an obstacle to existing distributed MPC formulations. In this thesis a discrete-time cloud-based model predictive control architecture for …
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Robust control of nonlinear systems in the presence of uncertainties
… of nonlinearity and uncertainty, and some stability theory can be developed.<br/><br/>The techniques developed here are concerned with both robust stability control design and robust tracking control design for SISO and MIMO nonlinear uncertain systems where closed loop stability can be …
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Feedback control of oscillations in combustion and cavity flows
… is giving rise to. The controller used is both closed-loop, employing an actuator to modify some system parameter in response to a measured signal, and adaptive, meaning that it is able to maintain control over a wide range of operating conditions. The controller is applied to combustion systems …
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Computational analysis of real-time convex optimization for control systems
… The driving requirement is to maintain closed-loop stability, feasibility and well-posedness of the optimal control problem, and bounded iterations for the optimization algorithm. A detailed analysis provides sufficient conditions for meeting these requirements. A realistic example of a …
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Contributions to the dynamics of helicopters with active rotor controls
This dissertation presents an aeromechanical closed loop stability and response analysis of a hingeless rotor helicopter with a Higher Harmonic Control (HHC) system for vibration reduction. The analysis includes the rigid body dynamics of the helicopter and blade flexibility. The gain matrix is …
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NONLINEAR OBSERVER/CONTROLLER DESIGNS FOR SPACECRAFT ATTITUDE CONTROL SYSTEMS WITH UNCALIBRATED GYROS
… separately developed, then combined. Lyapunov stability analysis is used to demonstrate the stability and convergence properties of each design. First, an observer to estimate gyro bias is developed, both with and without added noise effects. The observer is shown to be exponentially stable …
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Receding-horizon switched linear system design: a semidefinite programming approach with distributed computation
… with converse results which rule out levels of closed-loop stability based on the infeasibility of individual SDP problems. This permits the achievable closed-loop performance level to be approximated to arbitrary accuracy. Examined next are two different performance problems: one of disturbance …
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