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 “"Linear Parameter-Varying"”.
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Robust Control of Input-Delay Linear Parameter-Varying (LPV) Systems
Practical systems are nonlinear and time-varying and thus linear techniques can expose their control design to extra conservatism. Nevertheless, the Linear Parameter-Varying (LPV) representation can effectively describe them, which in contrast to linearization, maintains the principal dynamic modes …
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A linear parameter varying control methodology for reduction of helicopter higher harmonic vibration
… controller developed in this thesis uses the Linear Parameter Varying (LPV) synthesis method, which provides performance and stability guarantees over the advance ratio parameter space. The three controllers are evaluated in the RCAS environment at fixed and maneuvering flight conditions. The …
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Linear Parameter Varying Path Following Control of a Small Fixed Wing Unmanned Aerial Vehicle
… aircraft was developed through application of parameter estimation techniques to simulated flight test data. Multiple controllers were devised based on this model for path following, including a self-scheduled linear parameter-varying (LPV) controller with path curvature as a scheduling …
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Robust Controller Interpolation With Application to Gain-Scheduling
… interpolation criteria is translated into a parameterization of all stabilizing interpolated controllers leveraging a Youla controller parameterization. Second, an interpolation framework is proposed for cases that lack an appropriate controller parameterization. The proposed framework …
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A Semidefinite Programming Approach for Control of Systems Along Trajectories
… the trajectory, resulting in a nonstationary linear parameter-varying (NLPV) model, and then constructing an NLPV synthesis. Synthesis conditions are derived for NLPV systems using an operator theoretic framework with the ℓ 2-induced norm as the performance measure. These conditions are …
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Computationally Driven Algorithms for Distributed Control of Complex Systems
… The models assumed for the subsystems are linear time-varying or linear parameter-varying. Linear time-varying models are useful for describing nonlinear equations that are linearized about prespecified trajectories, and linear parameter-varying models allow for capturing the nonlinearities …
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Multivariable Modeling and Control of the Response to Anesthesia
… this dissertation proposes the use of piecewise-linear multivariable models of the effects of anesthetic and stimuli inputs on patient vital signs. These models are developed by utilizing data-based system identification methods. Different model structures such as linear time invariant (LTI), …
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On-line estimation approaches to fault-tolerant control of uncertain systems
… estimation via Sliding Mode Observer (SMO); linear parameter-varying (LPV) control; two-level distributed control with learning coordination.
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Modeling and Control of Tensegrity-Membrane Systems
… models are developed based on the nonlinear finite element method. The other model is a control-oriented model, which is suitable for control design. Numerical analysis is conducted using these three models to study the mechanical properties of tensegrity-membrane systems. Two control …
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Modeling and Control of an Active Dihedral Fixed-Wing Unmanned Aircraft
… locations. Simulations were completed using linear parameter-varying (LPV) models, derived from traditional Newtonian aircraft dynamics and associated kinematic equations, to improve the modeling of the nonlinear active dihedral system. The stability of the LPV system was evaluated using …
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Convex Modeling Techniques for Aircraft Control
… approach. One such design method leads to a linear parameter varying (LPV) controller that changes based on the real-time variation of system dynamics. Before such a controller can be designed, the system has to also be represented as an LPV system. The current effort proposes a LPV modeling …
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Mean-value modelling and robust control of the airpath of a turbocharged diesel engine.
… of the engine is derived with a focus on the parameterisation of the turbocharger. The effect of heat transfer via the turbocharger housing on the efficiencies derived from temperature measurements is identified as being very significant at low speed and load points regularly met on emission …
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Fault-Tolerant Control and Fault-Diagnosis Design for Over-Actuated Systems with Applications to Electric Ground Vehicles
… effort grouping method, the dynamics of the nonlinear over-actuated system with actuator faults is further modeled based on a generalized actuator fault model. A sliding mode control technique based FT controller is first designed to attenuate the disturbance and the uncertainty caused by the …
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Observer-based robust fault estimation for fault-tolerant control
… is made for direct application to smooth non-linear systems via the use of linear parameter-varying systems (LPV) modeling.The main contributions of the research are thus:- The development of a robust observer-based FE method and integration design for the FE and AFTC systems with the bounded …
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L1 adaptive control within Learn-to-Fly
… control theory were required to enable the linear reference systems to be updated (which leads to switched reference systems) as the modeling algorithm adjusts the vehicle model and to be parameterized (which can be captured by linear parameter-varying (LPV) models) by different flight …
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Robust scheduling control of aeroelasticity.
… The controllers are constructed using a Linear Parameter Varying (LPV) framework, where the plant and controllers can be represented as linear systems which are functions of a parameter, in this case airspeed. The LPV controllers are constructed using Linear Matrix Inequalities (LMIs), …
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Unknown input observer approaches to robust fault diagnosis
… Guidance and Control (ADDSAFE).- Propose a linear time-invariant (LTI) model-based robust fast adaptive fault estimator (RFAFE) with UI de-coupling to estimate the aircraft elevator oscillatory faults considered as actuator faults.- Propose a UI-proportional integral observer (UI-PIO) to …
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Evaluation of Stability Boundaries in Power Systems
Power systems are extremely non-linear systems which require substantial modeling and control efforts to run continuously. The movement of the power system in parameter and state space is often not well understood, thus making it difficult or impossible to determine whether the system is nearing …
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Nonlinear Observers for Aircraft Maneuvering in Wind
… addresses these gaps by advancing nonlinear observer design and flight dynamic modeling to estimate wind from aircraft motion with assured performance. First, a symmetry-preserving, reduced-order state observer is introduced for the unmeasured part of a system's state, leveraging the …
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